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: Receivers and CQI Measures for MIMO-CDMA Systems in Frequency-Selective Channels | EURASIP Journal on Applied Signal Processing 2005 11 1668-1679 2005 Hindawi Publishing Corporation Receivers and CQI Measures for MIMO-CDMA Systems in Frequency-Selective Channels Jianzhong Charlie Zhang Nokia Research Center 6000 Connection Drive Irving TX 75039 USA Email Balaji Raghothaman Nokia Research Center 6000 Connection Drive Irving TX 75039 USA Email Yan Wang Nokia Research Center 6000 Connection Drive Irving TX 75039 USA Email Giridhar Mandyam Nokia Research Center 6000 Connection Drive Irving TX 75039 USA Email Received 1 March 2004 Revised 9 November 2004 We investigate receiver designs and CQI channel quality indicator measures for the jointly encoded JE and separately encoded SE types of MIMO transmission. For the JE transmission we develop a per-Walsh code joint detection structure consisting of a front-end linear filter followed by joint symbol detection among all the streams. We derive a class of filters that maximize the so-called constrained mutual information and show that the conventional LMMSE and MVDR equalizers belong to this class. This constrained mutual information also provides us with a CQI measure describing the MIMO link quality similar to the notion of generalized SNR. Such a measure is essential for both link adaptation and also to provide a means of link-to-system mapping. For the case of SE transmission we extend the successive decoding algorithm of per-antenna rate control PARC to multipath channels and show that in this case successive decoding achieves the constrained mutual information. Meanwhile similar to the case of JE schemes we also derive proper CQI measures for the SE schemes. Keywords and phrases CDMA MIMO PARC CQI link-to-system mapping constrained optimization. 1. INTRODUCTION Information-theoretic studies in 4 5 showed that multipletransmit multiple-receive-antenna MIMO systems offer potential for realizing high .
