Topic 1: Intelligent resource management and service provisioning for open radio access networks (O-RAN) 本研究專注在開放無線接取網路 (Open Radio Access Network, O-RAN) 與雲端接取網絡 (Could RAN, C-RAN) 架構下，提出一新穎之通訊服務模型，如圖所示，用以在密集小細胞網絡 (Dense Small Cell Network, DSN) 中提供高品質的通訊服務。為達成此目標，我們將頻譜資源共享、通道和功率分配以及干擾管理的跨層功能集成到 O-RAN/C-RAN 架構中，並藉由 DSN密集佈建的小基地台，提供可擴展且高效的寬頻無線通訊。所提出的方法和服務模型可以相容於支持 3GPP 標準的干擾控制機制，例如：feICIC/ICIC技術，具有作為DSN資源管理系統實作之可行性。根據大區域的模擬顯示，在跨越 100 平方公里的區域中，所提出的方法可以在單一電信營運商所擁有的 20 MHz頻譜資源下提供 21 Gbps 的下行通道吞吐量，相較典型 ICIC 方法的模擬結果，本研究提出的方法可以達到 5 倍的通訊增益，這顯示我們提出的方案對未來寬頻無線服務是一個頗具希望的高效益解決方案。

Mobile networks have seen more than a thousand times traffic increases in the past decade. Network operators face an ever increasing demand and cost to deploy denser networks in order to maintain the quality of services. In view of this paradigm shift, we present an open cloud radio access network (O-RAN/C-RAN) service model in this work. Integrating the cross-layer functions of spectrum resource sharing, channel and power allocation, and interference management in an O-RAN/C-RAN architecture, we explore the feasibility of providing a scalable yet efficient broadband wireless service with dense small cell networks (DSN). The proposed methods and architecture can be applied to DSN that support the functions of (further enhanced) inter-cell interference cancelation (feICIC/ICIC) techniques of 3GPP standard, and have the potential to provide a cost-effective solution for high-quality DSN. Simulation results across an area of 100 km2 show that the proposed scheme can offer an aggregate downlink throughput of 21 Gbps over a maximum channel bandwidth of 20 MHz, which is 5 times the throughput with a typical ICIC method, making it a promising and cost-effective solution for future broadband wireless services. The related research papers are listed as follows:


Reference：
▶ S.-H. Wu, C.-H. Ko, and H.-L. Chao, “On-Demand Coordinated Spectrum and Resource Provisioning under an Open C-RAN Architecture for Dense Small Cell Networks,” early access on IEEE Trans. on Mobile Computing, Oct. 2022. (Link)
▶ S. -H. Wu et al., “A cloud model and concept prototype for cognitive radio networks, ” in IEEE Wireless Communications, vol. 19, no. 4, pp. 49-58, August 2012. (Link)
▶  S. -H. Wu, H. -L. Chao, C. -H. Ko, S. -R. Mo, C. -F. Liang and C. -C. Cheng, "Green Spectrum Sharing in a Cloud-Based Cognitive Radio Access Network," in 2013 IEEE International Conference on Green Computing and Communications and IEEE Internet of Things and IEEE Cyber, Physical and Social Computing, Beijing, China, 2013, pp. 276-281 (Link)  
  Topic 2: mmWave hybrid beamforming and procoding for next generation mobile networks

本研究專注在寬頻毫米波多輸入與輸出系統(multiple input multiple output, MIMO)中，基於可重組式混合波束成型架構(reconfigurable hybrid beamforming, R-HBF)開發高效益的波束與通道追蹤機制。藉由可重組式混合波束成型架構的特性，我們以一種階層式的多重解析度波束掃描與空時壓縮感知技術，如圖所示，在毫米波MIMO 正交分頻多工系統(orthogonal frequency division multiplexing , OFDM)中達成快速波束與多通道係數的擷取與追蹤。模擬結果顯示我們所提出的方案大幅減低了波束訓練的時間，以估計的通道係數所得的通道容量相對於以完美通道係數所得的通道容量也僅只差 2dB。且既使在典型的都會毫米波行動通訊環境中，我們所提方案的波束選擇錯誤也僅約是0.001等級。

An efficient beam and channel acquisition and tracking scheme is developed under a reconfigurable hybrid beamforming (R-HBF) architecture for wideband millimeter wave (mmWave) multiple input multiple output (MIMO) systems. Under such an R-HBF, a hierarchical multi-resolution beam scanning and space-frequency compressive sensing method is proposed to achieve fast beam and channel acquisitions in mmWave MIMO orthogonal frequency division multiplexing (OFDM) systems. With the initial frequency-domain beam space channel estimates, Kalman-based algorithms are further developed to track the transmit and receive beamforming directions and the channel coefficients of the sparse propagation paths in mmWave mobile channels. Simulations show that the proposed method can greatly reduce the beam training time, and that the channel capacity evaluated with the estimated channels is only  2 dB inferior to the one with ideal channels. Moreover, the beam selection error rates are less than 10-3 in typical urban mmWave mobile channels and traveling speeds even if the transmit power is only 10 dBm. The related research papers are listed as follows:

Reference：
▶ S.-H. Wu and G.-Y. Lu, “Compressive Beam and Channel Tracking with Reconfigurable Hybrid Beamforming in mmWave MIMO OFDM Systems,” in IEEE Trans. on Wireless Communications, vol. 22, no. 2, pp. 1145-1160, Feb. 2023. (Link)
▶ S.-H. Wu, L.-K. Chiu, and J.-W. Wang, "Reconfigurable hybrid beamforming for dual-polarized mmWave MIMO channels: Stochastic channel modeling and architectural adaptation methods,” in IEEE Trans. on Communications, vol. 66, no. 2, pp. 741-755, Feb. 2018. (Link)
▶ S.-H. Wu, L.-K. Chiu, K.-Y. Lin and T.-H. Chang, "Robust hybrid beamforming with phased antenna arrays for downlink SDMA in indoor 60GHz channels,” in IEEE Trans. on Wireless Communications, vol. 12, no. 9, pp. 4542-4557, Sept. 2013. (Link)
 

Journals

• S.-H. Wu, C.-H. Ko, and H.-L. Chao, "On-Demand Coordinated Spectrum and Resource Provisioning Under an Open C-RAN Architecture for Dense Small Cell Networks," in IEEE Transactions on Mobile Computing, vol. 23, no. 1, pp. 673-688, Jan. 2024, doi: 10.1109/TMC.2022.3215488.
• S.-H. Wu and G.-Y. Lu, "Compressive Beam and Channel Tracking With Reconfigurable Hybrid Beamforming in mmWave MIMO OFDM Systems," in IEEE Transactions on Wireless Communications, vol. 22, no. 2, pp. 1145-1160, Feb. 2023, doi: 10.1109/TWC.2022.3202160.
• C.-H. Ko and S.-H. Wu, "A Framework for Proactive Indoor Positioning in Densely Deployed WiFi Networks,” IEEE Transactions on Mobile Computing, vol. 21, no. 1, pp. 1-15, Jan. 2022.
• K.-T. Feng, L.-H. Shen, C.-Y. Li, P.-T. Huang, S.-H. Wu, L.-C. Wang, Y.-B. Lin, and M.-C. F. Chang, "3D On-Demand Flying Mobile Communication for Millimeter Wave Heterogeneous Networks,” IEEE Network Magazine, vol. 34, no. 5, pp. 198-204, March 2020.
• C.-K. Tseng, S.-H. Wu, H.-L. Chao, T. Q. S. Quek, and C.-H. Gan "Effective service architecture and antenna allocation mechanism for CoMP transmissions in ultra dense networks,” IEEE Transactions on Wireless Communications, vol. 18, no. 9, pp. 4283-4297, Sept. 2019.
• C.-K. Tseng and S.-H. Wu, "Selective and opportunistic AF relaying for cooperative ARQ: An MLSD perspective,” IEEE Transactions on Communications, vol. 67, no. 1, pp. 124-139, Jan. 2019.
• H.-L. Chiu and S.-H. Wu, "Cross-Layer performance analysis of cooperative ARQ with opportunistic multi-point relaying in mobile networks,” IEEE Transactions on Wireless Communications, vol. 17, no. 6, pp. 4191-4205, June, 2018.
• C.-K. Tseng and S.-H. Wu, "Effective protocols and channel quality control mechanisms for cooperative ARQ with opportunistic AF relaying,” IEEE Transactions on Vehicular Technology, vol. 67, no. 3, pp. 2382-2397, March, 2018.
• S.-H. Wu, L.-K. Chiu, and J.-W. Wang, "Reconfigurable hybrid beamforming for dual-polarized mmWave MIMO channels: Stochastic channel modeling and architectural adaptation methods,” IEEE Transactions on Communications, vol. 66, no. 2, pp. 741-755, Feb. 2018.
• S.-H. Wu, H.-L. Chiu, and J.-H. Li, "Effectiveness and relay efficiency of opportunistic multipoint relaying on cooperative ARQ,” IEEE Transactions on Vehicular Technology, vol. 66, no. 6, pp. 4781-4796, June, 2017.
• D.-H. Huang, S.-H. Wu, W.-R. Wu, and P.-H. Wang, "Cooperative radio source positioning and power map reconstruction: A sparse Bayesian learning approach,” IEEE Transactions on Vehicular Technology, vol. 64, no. 6, pp. 2318-2332, June, 2015.
• L.-K. Chiu and S.-H. Wu, "An effective approach to evaluate the training and modeling efficacy in MIMO time-varying fading channels,” IEEE Transactions on Communications, vol. 64, no. 1, pp. 140-155, Jan. 2015.
• S.-H. Wu, L.-K. Chiu, K.-Y. Lin,  and T.-H. Chang, "Robust hybrid beamforming with phased antenna arrays for downlink SDMA in indoor 60GHz channels'' IEEE Transactions on Wireless Communications, vol. 12, no. 9, pp. 4542-4557, Sept. 2013.
• S.-H. Wu, H.-L. Chao, C.-H. Ko, S.-R. Mo, C.-T. Jiang, T.-L. Li, C.-C. Cheng, and C.-F. Liang, “A Cloud model and concept prototype for cognitive radio networks,” IEEE Wireless Communications Magazine, special issue on Cognitive Radio Networks: vol. 19, no. 4, pp. 49-58, Aug. 2012.
• C.-I. Kuo, S.-H. Wu, and C.-K. Tseng, “Robust linear beamformer designs for coordinated multi-point AF relaying in downlink multi-cell networks,” IEEE Transactions on Wireless Communications, vol. 11, no. 9, pp. 3272-3283, Sept. 2012.
• L.-C. Wang, W.-C. Liu, and S.-H. Wu, “Analysis of diversity-multiplexing tradeoff in a cooperative network coding system," IEEE Transactions on Communications, vol. 59, no. 9, pp. 2373-2376, Sept. 2011.
• S.-H. Wu, C.-Y. Yang, and D.-H. Huang, "Cooperative sensing of wideband cognitive radio: A multiple hypotheses testing approach," IEEE Transactions on Vehicular Technology, special issue on “Achievements and the Road Ahead: The First Decade of Cognitive Radio”, vol. 59, no. 4, pp. 1835-1846, May, 2010
• S.-H. Wu, U. Mitra,  and C.-C. J. Kuo, "Iterative joint channel estimation and multiuser detection for DS-CDMA in frequency-selective fading channels," IEEE Transactions on Signal Processing, vol. 56, no. 7, pp. 3261-3277, July, 2008.
• S.-H. Wu, U. Mitra, and C.-C. J. Kuo, "Performance of linear reduced-rank multistage receivers for DS-CDMA in frequency-selective fading channels," IEEE Transactions on Information Theory, vol. 51, no. 10, pp. 3493-3517, Oct. 2005.
• S.-H. Wu, U. Mitra, and C.-C. J. Kuo, "Reduced-Rank multistage receivers for DS-CDMA in frequency-selective fading channels," IEEE Transactions on Communications, vol. 53, no. 2, pp. 366-378, Feb. 2005.

Conference Papers

• S.-H. Wu, C.-H. Ko, and H.-L. Chao, "On-demand coordinated spectrum and resource provisioning under an open C-RAN architecture for dense small cell networks," in IEEE Transactions on Mobile Computing, vol. 23, no. 1, pp. 673-688, Jan. 2024, doi: 10.1109/TMC.2022.3215488.
• S.-H. Wu and G.-Y. Lu, "Compressive beam and channel tracking with reconfigurable hybrid beamforming in mmwave MIMO OFDM systems," in IEEE Transactions on Wireless Communications, vol. 22, no. 2, pp. 1145-1160, Feb. 2023, doi: 10.1109/TWC.2022.3202160.
• C.-H. Ko and S.-H. Wu, "A framework for proactive indoor positioning in densely deployed WiFi networks,” IEEE Transactions on Mobile Computing, vol. 21, no. 1, pp. 1-15, Jan. 2022.
• K.-T. Feng, L.-H. Shen, C.-Y. Li, P.-T. Huang, S.-H. Wu, L.-C. Wang, Y.-B. Lin, and M.-C. F. Chang, "3D on-demand flying mobile communication for millimeter wave heterogeneous networks,” IEEE Network Magazine, vol. 34, no. 5, pp. 198-204, March 2020.
• K.-R Liu, S.-H. Wu, and L.-L. Yang, “Antenna selections for multi-target detection of vehicular mmwave radar with large antenna arrays", in Proc. of IEEE Vehicular Technology Conference 2020-Spring, Antwerp, Belgium, May 2020. 
• H.-L Chiu, S.-H. Wu, and H.-L. Chao, “Throughput performance study of smart antenna systems in WiFi networks", in Proc. of IEEE Wireless Communications and Networking Conference, Seoul, South Korea, April, 2020.
• S.-H. Wu and G.-Y. Lu, “Compressive sensing based beam and channel tracking with reconfigurable hybrid beamforming in mmWave MIMO OFDM systems", in Proc. of IEEE Vehicular Technology Conference 2019-Fall, Honolulu, HI, USA, Sept. 2019.
• P.-Z. Luo, H.-L. Chao, and S.-H. Wu “Robustness of IoT gateway deployment in smart hospitals", in Proc. of IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, Istanbul, Turkey, Sept., 2019.
• Y.-H. Kao, H.-L. Chiu, S.-H. Wu, H.-L. Chao, and C.-H. Gan “Throughput analysis of LTE and WiFi heterogeneous dense small cell networks,” in Proc. of IEEE Wireless Communications and Networking Conference, Marrakech, Morocco, April, 2019.
• Y.-C. Yang, H.-L. Chiu and S.-H. Wu, “QoS-Fair WiFi offloading in 4G LTE and 5G new radio networks,” in Proc. of Taiwan Telecommunications annual meeting, Taichung, Taiwan, Jan., 2019.
• C.-K. Tseng, S.-H. Wu, H.-L. Chao, T. Q. S. Quek, and C.-H. Gan "Effective service architecture and antenna allocation mechanism for CoMP transmissions in ultra dense networks,” IEEE Transactions on Wireless Communications, vol. 18, no. 9, pp. 4283-4297, Sept. 2019.
• C.-K. Tseng and S.-H. Wu, "Selective and opportunistic AF relaying for cooperative ARQ: An MLSD perspective,” IEEE Transactions on Communications, vol. 67, no. 1, pp. 124-139, Jan. 2019.
• H.-L. Chiu and S.-H. Wu, "Cross-Layer performance analysis of cooperative ARQ with opportunistic multi-point relaying in mobile networks,” IEEE Transactions on Wireless Communications, vol. 17, no. 6, pp. 4191-4205, June, 2018.
• C.-K. Tseng and S.-H. Wu, "Effective protocols and channel quality control mechanisms for cooperative ARQ with opportunistic AF relaying,” IEEE Transactions on Vehicular Technology, vol. 67, no. 3, pp. 2382-2397, March, 2018.
• S.-H. Wu, L.-K. Chiu, and J.-W. Wang, "Reconfigurable hybrid beamforming for dual-polarized mmWave MIMO channels: Stochastic channel modeling and architectural adaptation methods,” IEEE Transactions on Communications, vol. 66, no. 2, pp. 741-755, Feb. 2018.
• G.-Y. Lu and S.-H. Wu, “Multi-Resolution beam tracking and channel estimation with reconfigurable hybrid beamforming in wideband mmWave radio,” in Proc. of TANET, Taoyuan, Taiwan, Oct., 2018.
• Y.-C. Chang, S.-H. Wu, L.-M. Tseng, H.-L. Chao, and C.-H. Ko, “AF detection by exploiting the spectral and temporal characteristics of ECG signals with the LSTM model,” in Proc. of Computing in Cardiology, Maastricht, Netherlands, Sept., 2018.
• C.-H. Ko and S.-H. Wu, “Performance analysis on a radio map based indoor positioning system,” in Proc. of IEEE Asia Pacific Wireless Communications Symposium, Hsinchu, Taiwan, Aug., 2018.
• H.-L. Chiu, S.-H. Wu, and H.-L. Chao, “Throughput analysis of WiFi networks in dense deployment scenarios,” in Proc. of IEEE Asia Pacific Wireless Communications Symposium, Hsinchu, Taiwan, Aug., 2018.
• J.-C. Wang, H.-L. Chiu, C.-S. Sun, H.-L. Chao, and S.-H. Wu, “Joint switched-beam training and rate adaptation schemes for MIMO WLANs,” in Proc. of IEEE Globecom, Singapore, Dec., 2017.
• Y.-H. Chen, H.-L. Chao, S.-H. Wu, and C.-H. Gan, “Resource allocation with CoMP transmission in ultra dense cloud-based LTE small cell networks,” in Proc. of IEEE International Symposium on Personal, Indoor and Mobile Radio Communications,” Montreal, Canada, Oct., 2017.
• S.-H. Wu, H.-L. Chiu, and J.-H. Li "Effectiveness and relay efficiency of opportunistic multipoint relaying on cooperative ARQ,” IEEE Transactions on Vehicular Technology, vol. 66, no. 6, pp. 4781-4796, June, 2017.
• C.-K. Tseng, S.-H. Wu, H.-L. Chao, C.-L. Liu, and C.-H. Gan, “An effective antenna allocation for CoMP transmission in dense small cell networks,” in Proc. of IEEE Globecom, Washington, D.C., USA, Dec., 2016.
• C.-H. Ko and S.-H. Wu, “A proactive indoor positioning system in randomly deployed dense WiFi networks,” in Proc. of IEEE Globecom, Washington, D.C., USA, Dec., 2016.
• S.-H. Wu, J.-W. Wang, and J.-Y. Chen, “Reconfigurable hybrid beamforming for dual-polarized mmWave MIMO channels,” in Proc. of IEEE International Symposium on Personal, Indoor and Mobile Radio Communications,” Valencia, Spain, Sept., 2016.
• H.-L. Chao, T.-L. Li, C.-C. Chung, and S.-H. Wu, “Throughput analysis of a hybrid MAC protocol for WiFi-based heterogeneous cognitive radio networks” in Proc. of IEEE Vehicular Technology Conference 2015-Fall,” Boston, MA, USA, Sept. 2015.
• L.-K. Chiu and S.-H. Wu, “Hybrid radio frequency beamforming and baseband precoding for downlink MU-MIMO mmWave channels,” in Proc. of IEEE International Conference on Communications, London, U.K., June, 2015.
• D.-H. Huang, S.-H. Wu, W.-R. Wu, and P.-H. Wang, "Cooperative radio source positioning and power map reconstruction: A sparse Bayesian learning approach,” IEEE Transactions on Vehicular Technology, vol. 64, no. 6, pp. 2318-2332, June, 2015.
• L.-K. Chiu and S.-H. Wu, "An effective approach to evaluate the training and modeling efficacy in MIMO time-varying fading channels,” IEEE Transactions on Communications, vol. 64, no. 1, pp. 140-155, Jan. 2015.
• S.-H. Wu, and L.-K. Chiu “Diversity and directivity tradeoff in indoor 60 GHz MIMO Channels: A case study with dual-polarized hybrid planar antenna arrays,” in Proc. of Asia-Pacific Signal and Information Processing Association , Annual Summit and Conference, Siem Reap, Cambodia, Dec., 2014.
• C.-H. Hsu and S.-H. Wu, “Robust signal synthesis of the 12-lead ECG using 3-lead wireless ECG systems” in Proc. of IEEE International Conference on Communications, Sydney, Australia, June, 2014.
• H.-L. Chao, S.-H. Wu, Y.-H. Huang, and S.-C. Li “Cooperative spectrum sharing and scheduling in self-organizing femtocell networks” in Proc. of IEEE International Conference on Communications, Sydney, Australia, June, 2014.
• L.-K. Chiu, M.-C. Chiang, P.-L. Chiang, Y.-J. Chi, S.-H. Wu, and F.-C. Chen “Empirical MIMO capacity of a 22 dual-polarized planar antenna array in indoor 60 GHz channels,” in Proc. of International Conference on Communications and Networking in China, Guilin, China, Aug., 2013.
• S.-H. Wu, H.-L. Chao, C.-H. Ko, S.-R. Mo, C.-F. Liang, and C.-C. Cheng, “Green spectrum sharing in a Cloud-based cognitive radio access network,” in Proc. of IEEE International Conference on Green Computing and Communications, Peking, China, Aug., 2013. (Best Paper Award)
• S.-H. Wu, L.-K. Chiu, K.-Y. Lin, and T.-H. Chang, "Robust hybrid beamforming with phased antenna arrays for downlink SDMA in indoor 60GHz channels” IEEE Transactions on Wireless Communications, vol. 12, no. 9, pp. 4542-4557, Sept. 2013.
• S.-H. Wu, H.-L. Chao, C.-H. Ko, S.-R. Mo, C.-T. Jiang, T.-L. Li, C.-C. Cheng, and C.-F. Liang, “A Cloud model and concept prototype for cognitive radio networks,” IEEE Wireless Communications Magazine, special issue on Cognitive Radio Networks: vol. 19, no. 4, pp. 49-58, Aug. 2012.
• C.-I. Kuo, S.-H. Wu, and C.-K. Tseng, “Robust linear beamformer designs for coordinated multi-point AF relaying in downlink multi-cell networks,” IEEE Transactions on Wireless Communications, vol. 11, no. 9, pp. 3272-3283, Sept. 2012.
• C.-I. Kuo, S.-H. Wu and C.-K. Tseng, “Robust linear beamformer designs for CoMP AF relaying in downlink multi-cell networks,” in Proc. of Asia-Pacific Signal and Information Processing Association, Annual Summit and Conference, Los Angeles, USA, Dec., 2012.
• S.-H. Wu, H.-L. Chao, C.-T. Jiang, S.-R. Mo, C.-H. Ko, T.-L. Li, C.-F. Liang, and C.-C. Cheng, “A conceptual model and prototype of cognitive radio Cloud networks,” in Proc. of IEEE WCNC Workshop on Wireless Cloud and White Space Oriented Networks, Paris, France, April, 2012.
• Y.-S. Yin, L.-K. Chiu, and S.-H. Wu, “A space-time precoded hybrid beamforming architecture for broadband transmissions in 60GHz radio,” in Proc. of IEEE International Symposium on Personal, Indoor and Mobile Radio Communications,” Toronto, Canada, Sept., 2011.
• L.-K. Chiu and S.-H. Wu, “The achievable rate of training-based MIMO system over time-varying fading channels: A BCRB perspective on channel tracking,” in Proc. of IEEE International Conference on Communications, Kyoto, Japan, June, 2011.
• C.-K. Tseng and S.-H. Wu, “Effective cooperative ARQ protocols with the opportunistic selective AF relaying: The perspective of outage v.s. packet error probabilities” in Proc. of IEEE International Conference on Communications, Kyoto, Japan, June, 2011.
• C.-H. Ko, D.-H. Huang, and S.-H. Wu, “Cooperative spectrum in TV white spaces: When cognitive radio meets Cloud” in Proc. of IEEE INFOCOM Workshop on Cloud Computing, Shanghai, China, Apr., 2011.
• R.-D. Chiu and S.-H. Wu, “A BAN system for real time ECG monitoring: From wired to wireless measurements,” in Proc. of IEEE Wireless Communications and Networking Conference, Cancun, Mexico, Mar., 2011.
• L.-C. Wang, W.-C. Liu, and S.-H. Wu, “Analysis of diversity-multiplexing tradeoff in a cooperative network coding system," IEEE Transactions on Communications, vol. 59, no. 9, pp. 2373-2376, Sept. 2011.
• S.-H. Wu, C.-Y. Yang, and D.-H. Huang, "Cooperative sensing of wideband cognitive radio: A multiple hypotheses testing approach," IEEE Transactions on Vehicular Technology, special issue on “Achievements and the Road Ahead: The First Decade of Cognitive Radio”, vol. 59, no. 4, pp. 1835-1846, May, 2010
• D.-H. T. Huang, S.-H. Wu, and P.-H. Wang, "Cooperative spectrum sensing and locationing: A Sparse Bayesian Learning Approach," in Proc. of IEEE Globecom, Miami, FL, Dec., 2010.
• S.-H. Wu, K.-Y. Lin, L.-K. Chiu, and M.-C. Chiang, “Hybrid beamforming for two-user SDMA in millimeter wave radio,” in Proc. of IEEE International Symposium on Personal, Indoor and Mobile Radio Communications,” Istanbul, Turkey, Sept., 2010.
• H.-L. Chiu, S.-H. Wu, and J.-H. Li, “Cooperative ARQs with Opportunistic distributed space-time coding: Effective protocols and performance analysis,” in Proc. of IEEE Information Theory Workshop, Dublin, Ireland, Aug., 2010.
• H.-L. Chiu, S.-H. Wu, and J.-H. Li, “Diversity and delay-limited throughput analysis for the effective cooperative ARQ protocols with opportunistic distributed space-time coding,” in Proc. of IEEE Vehicular Technology Conference 2010-Spring,” Taipei, Taiwan, May, 2010.
• Y.-H. Huang and S.-H. Wu, “Time synchronization protocol for small-scale wireless sensor networks,” in Proc. of IEEE Wireless Communications and Networking Conference,” Sydney, Australia, Apr., 2010.
• S.-H. Wu, K.-Y. Lin, and L.-K. Chiu, “Hybrid beamforming using convex optimization for SDMA in millimeter wave radio,” in Proc. of IEEE International Symposium on Personal, Indoor and Mobile Radio Communications,” Tokyo, Japan, Sept., 2009.
• C.-K. Tseng and S.-H. Wu, “simple cooperative ARQ protocols with selective amplify-and-forward relaying,” in Proc. of IEEE International Symposium on Personal, Indoor and Mobile Radio Communications,” Tokyo, Japan, Sept., 2009.
• L.-K. Chiu and S.-H. Wu, “The modified Bayesian Cramer-Rao bound for MIMO fading tracking,” in Proc. of IEEE International Conference on Communications, Dresden, Germany, June, 2009.
• L.-C. Wang, W.-C. Liu, and S.-H. Wu, “Diversity-Multiplexing tradeoff analysis of a cooperative network coding system,” in Proc. of IEEE Sarnoff Symposium, Princeton NJ, U.S.A., March, 2009.
• H.-L. Chiu and S.-H. Wu, “Cooperative ARQ for distributed space-time coding: the diversity-multiplexing-delay tradeoff,” in Proc. of International Symposium on Information Theory and Applications,” Auckland, New Zealand, Dec., 2008.
• S.-H. Wu, L.-K. Chiu, K.-Y. Lin, and S.-J. Chung, “Planar arrays hybrid beamforming for SDMA in millimeter wave applications,” in Proc. of IEEE International Symposium on Personal, Indoor and Mobile Radio Communications,” Cannes, France, Sept., 2008.
• C.-Y. Yang and S.-H. Wu, “Cooperative spectrum sensing for wideband cognitive radio systems,” in Proc. of IEEE Asia Pacific Wireless Communications Symposium, Sendai, Japan, Aug., 2008.
• S.-H. Wu, “factor graph EM algorithm for joint channel tracking and MAP detection of MIMO-OFDMA in fading channels,” in Proc. of IEEE International Conference Acoustics, Speech and Signal Processing, Las Vegas, Nevada, April, 2008.
• S.-H. Wu, U. Mitra, and C.-C. J. Kuo, "Iterative joint channel estimation and multiuser detection for DS-CDMA in frequency-selective fading channels," IEEE Transactions on Signal Processing, vol. 56, no. 7, pp. 3261-3277, July, 2008.
• F.-H. Chiu, S.-H. Wu and C.-C. Jay Kuo, “Throughput analysis of adaptive MIMO-OFDM systems: from single to multiple users,” in Proc. of Wireless Telecommunications Symposium, Pomona, CA, April, 2007.
• S.-H. Wu, S.-G. Lee, and K.-C. Lai, “joint channel tracking and MAP detection for OFDMA systems in fading channels”, in Proc. of IEEE International Conference Acoustics, Speech and Signal Processing, Honolulu, Hawaii, April, 2007.
• F.-H. Chiu, S.-H. Wu, and C.-C. Jay Kuo, “Performance analysis and transceiver design for adaptive BIC-MIMO-OFDM systems,” in Proc. of IEEE Wireless Communications and Networking Conference, Hong Kong, China, March, 2007.
• S.-H. Wu, “Effects of estimation errors on the noncoherent capacity over time-varying channels,” in Proc. of IEEE Vehicular Technology Conference 2006-Fall, Montreal, Canada, Sep., 2006.
• F.-H. Chiu, S.-H. Wu, and C.-C. Jay Kuo, “Receiver design for bit-interleaved MIMO-OFDM systems over time-varying channels,” in Proc. of IEEE Wireless Communications and Networking Conference, Las Vegas, NV, Apr., 2006.
• F.-H. Chiu, S.-H. Wu, and C.-C. J. Kuo, "Joint MIMO channel tracking and symbol detection with em algorithm and soft decoding," in Proc. of IEEE Globecom, St. Louis, MO, Nov., 2005.
• F.-H. Chiu, S.-H. Wu, and C.-C. J. Kuo, "Robust joint channel estimation and symbol detection over MIMO channels using EM Algorithm," in Proc. of IEEE Vehicular Technology Conference 2005-Fall, Dallas, TX, Sep., 2005.
• S.-H. Wu and C.-C. J. Kuo, "On the performance of super-orthogonal space-time codes for correlated MIMO channels," in Proc. of IEEE International Conference on Acoustics, Speech and Signal Processing, Philadelphia, PA, March, 2005.
• S.-H. Wu, U. Mitra, and C.-C. J. Kuo, "Performance of linear reduced-rank multistage receivers for DS-CDMA in frequency-selective fading channels," IEEE Transactions on Information Theory, vol. 51, no. 10, pp. 3493-3517, Oct. 2005.
• S.-H. Wu, U. Mitra, and C.-C. J. Kuo, "Reduced-Rank multistage receivers for DS-CDMA in frequency-selective fading channels," IEEE Transactions on Communications, vol. 53, no. 2, pp. 366-378, Feb. 2005.
• S.-H. Wu, U. Mitra, and C.-C. J. Kuo, "Graph representation for joint channel estimation and symbol detection," in Proc. of IEEE Globecom, Dallas, TX, Dec., 2004.
• S.-H. Wu, U. Mitra and C.-C. J. Kuo, "Iterative MAP channel estimation and multiuser detection for DS-CDMA in frequency-selective fading channels," (invited paper) in Proc. of Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, Nov., 2004.
• F.-H. Chiu, S.-H. Wu, and C.-C. J. Kuo, "reduced-rank space-time channel estimation for DS-CDMA in MIMO dispersive channels," in Proc. of IEEE Vehicular Technology Conference 2004-Fall, Los Angeles, Sep., 2004.
• S.-H. Wu, U. Mitra, and C.-C. J. Kuo, "Noncoherent multiuser detection of DS-CDMA over multipath fading channels," in Proc. of IEEE International Conference on Communication, Paris, France, June, 2004.
• S.-H. Wu, U. Mitra, and C.-C. J. Kuo, "Multistage MMSE receivers for ultra-wide bandwidth impulse radio communications," in Proc. of IEEE Conference on Ultra Wideband Systems and Technologies, Kyoto, Japan, May, 2004.
• S.-H. Wu, U. Mitra, and C.-C. J. Kuo, "A common framework for blind multistage multiuser receivers of DS-CDMA in frequency-selective fading channels," in Proc. of IEEE Globecom, San Francisco, CA, Dec., 2003.
• S.-H. Wu, U. Mitra, and C.-C. J. Kuo, "Performance analysis of multistage BLUE/MMSE receivers for DS-CDMA in frequency selective fading channels," in Proc. of IEEE International Conference on Communication, Anchorage, Alaska, May, 2003.
• S.-H. Wu, U. Mitra, and C.-C. J. Kuo, "Joint channel estimation and multiuser detection for multipath fading channels in DS-CDMA systems," in Proc. of IEEE International Conference on Communication, Anchorage, Alaska, May, 2003.
• S.-H. Wu, U. Mitra, and C.-C. J. Kuo, "Performance analysis of a class of multistage DS-CDMA receivers for multipath channels," in Proc. of IEEE Information Theory Workshop, Paris, France, April, 2003.
• S.-H. Wu, U. Mitra, and C.-C. J. Kuo, "Multi-stage MMSE/MOE receivers for frequency selective fading channels in DS-CDMA systems," in Proc. of IEEE Globecom, Taipei, Taiwan, Nov., 2002.

Book chapters:

• S.-H. Wu, H.-L. Chao, H.-L. Chiu, C.-H. Ko, Y.-T. Li, T.-W. Chang, T.-L. Tsai, and C. Chen, "A cloud service model and architecture for small-cell RANs,” in Cloud Radio Access Networks, Principle, Technology, and Applications, Tony Quek, Mugen Peng, Osvaldo Simone, and Wei Yu, Eds., Cambridge Press, 2016.
• S.-H. Wu, L.-K. Chiu, K.-Y. Lin and M.-C. Chiang, "Planar antenna array hybrid beamforming for SDMA in millimeter wave WPAN,” in Radio Communications, Alessandro Bazzi, Eds., INTECH, April, 2010, ISBN 978-953-307-091-9.

Patents:

• S.-H. Wu, H.-L. Chao, and C.-K. Tseng, “Cooperative transmission system and cooperative transmission method for multiple access points in a wireless local area network,” US 10103790, 2018.
• 伍紹勳, “多輸入多輸出系統中天線子陣列彈性配置系統與其選擇方法,” TW I640172, 2018.
• S.-H. Wu, “System and selecting method for flexible allocations of antenna sub-arrays in multiple input multiple output systems,” US 10250303, 2019.
• S.-H. Wu, H.-L. Chao, and C.-H. Ko, “Access point and communication system for resource allocation,” US 9917669, 2018.
• S.-H. Wu, H.-L. Chao, and C.-H. Ko, “Resource allocation server and communication system for cloud-based radio access network,” US 9379836, 2016.
• S.-H. Wu and C.-H. Ko, “Radio system and operating method of the same,” US 9084121, 2015.
• S.-H. Wu, H.-L. Chao, C.-H. Ko, S.-R. Mo, C.-T. Jiang, T.-L. Li, C.-C. Cheng, C.-F. Liang “Cognitive radio communications system and operating method thereof,” US 8929387, 2015.
• 伍紹勳, 黃汀華, 柯俊先, “合作式頻譜估測與定位方法及系統”, TW I482518, 2015.
• S.-H. Wu, D.-H. Huang and C.-H. Ko, “Cooperative spectrum sensing method and system for locationing primary transmitters in a cognitive radio system,” US 8909242, 2014.
• 伍紹勳, 許智皓, “利用三個導程之差動電壓產生十二導程心電圖信號之方法與系統,” TW I637723, 2014.
• 伍紹勳, 許智皓, “利用导程的差动电压产生导程心电图信号的方法与系统,” CN 106175747, 2015.
• S.-H. Wu and C.-H. Hsu, "Method and system for generating twelve-lead electrocardiogram signals using three differential voltages," US 9622674, 2015.