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Combined ML and QR Detection Algorithm for MIMO-OFDM Systems with Perfect ChanneI State Information
Weizhi You,Lilin Yi,Weisheng Hu 한국전자통신연구원 2013 ETRI Journal Vol.35 No.3
An effective signal detection algorithm with low complexity is presented for multiple-input multiple-output orthogonal frequency division multiplexing systems. The proposed technique, QR-MLD, combines the conventional maximum likelihood detection (MLD) algorithm and the QR algorithm, resulting in much lower complexity compared to MLD. The proposed technique is compared with a similar algorithm, showing that the complexity of the proposed technique with T=1 is a 95% improvement over that of MLD, at the expense of about a 2-dB signalto- noise-ratio (SNR) degradation for a bit error rate (BER) of 10–3. Additionally, with T=2, the proposed technique reduces the complexity by 73% for multiplications and 80% for additions and enhances the SNR performance about 1 dB for a BER of 10–3.
Yongmin Qi,Yikai Su,Yaohui Jin,Weisheng Hu,Yi Zhu,Yi Zhang 한국전자통신연구원 2006 ETRI Journal Vol.28 No.5
In this paper we study the optimization issues of ring networks employing novel parallel multi-granularity hierarchical optical add-drop multiplexers (OADMs). In particular, we attempt to minimize the number of control elements for the off-line case. We present an integer linear programming formulation to obtain the lower bound in optimization, and propose an efficient heuristic algorithm called global bandwidth resource assignment that is suitable for the design of large-scale OADM networks.