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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Approaching the MIMO Capacity with a Low-Rate Feedback Channel in V-BLAST | EURASIP Journal on Applied Signal Processing 2004 5 762-771 2004 Hindawi Publishing Corporation Approaching the MIMO Capacity with a Low-Rate Feedback Channel in V-BLAST Seong TaekChung STAR Laboratory Stanford University Stanford CA 94305-9515 USA Email stchung@dsl.stanford.edu Angel Lozano Wireless Research Laboratory Lucent Technologies 791 Holmdel-Keyport Road Holmdel NJ 07733 USA Email aloz@lucent.com Howard C. Huang Wireless Research Laboratory Lucent Technologies 791 Holmdel-Keyport Road Holmdel NJ 07733 USA Email hchuang@lucent.com ArakSutivong Information Systems Laboratory Stanford University Stanford CA 94305-9510 USA Email arak@stanfordalumni.org John M. Cioffi STAR Laboratory Stanford University Stanford CA 94305-9515 USA Email cioffi@stanford.edu Received 8 December 2002 Revised 30 October 2003 This paper presents an extension of the vertical Bell Laboratories Layered Space-Time V-BLAST architecture in which the closed-loop multiple-input multiple-output MIMO capacity can be approached with conventional scalar coding optimum successive decoding OSD and independent rate assignments for each transmit antenna. This theoretical framework is used as a basis for the proposed algorithms whereby rate and power information for each transmit antenna is acquired via a low-rate feedback channel. We propose the successive quantization with power control SQPC and successive rate and power quantization SRPQ algorithms. In SQPC rate quantization is performed with continuous power control. This performs better than simply quantizing the rates without power control. A more practical implementation of SQPC is SRPQ in which both rate and power levels are quantized. The performance loss due to power quantization is insignificant when 4-5 bits are used per antenna. Both SQPC and SRPQ show an average total rate close to the closed-loop MIMO capacity if a capacity-approaching scalar code is used per antenna. Keywords and phrases adaptive antennas BLAST interference .