Reduced-Complexity Detection for DPC-OF/TDMA System Enhanced by Multi-Layer MIMO-OFDM in Wireless Multimedia Communications

Ming LEI  Hiroshi HARADA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E90-A   No.3   pp.571-580
Publication Date: 2007/03/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e90-a.3.571
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Multimedia and Mobile Signal Processing)
Category: Communications
MIMO,  OFDM,  Multi-Layer MIMO-OFDM,  Reduced-Complexity Detection,  DPC-OF/TDMA,  

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During these years, we have been focusing on developing ultra high-data-rate wireless access systems for future wireless multimedia communications. One of such kind of systems is called DPC-OF/TDMA (dynamic parameter controlled orthogonal frequency and time division multiple access) which targets at beyond 100 Mbps data rate. In order to support higher data rates, e.g., several hundreds of Mbps or even Gbps for future wireless multimedia applications (e.g., streaming video and file transfer), it is necessary to enhance DPC-OF/TDMA system based on MIMO-OFDM (multiple-input multiple-output orthogonal frequency division multiplexing) platform. In this paper, we propose an enhanced DPC-OF/TDMA system based on Multi-Layer MIMO-OFDM scheme which combines both diversity and multiplexing in order to exploit potentials of both techniques. The performance investigation shows the proposed scheme has better performance than its counterpart based on full-multiplexing MIMO-OFDM scheme. In addition to the Exhaustive Detection (EXD) scheme which applies the same detection algorithm on each subcarrier independently, we propose the Reduced-Complexity Detection (RCD) scheme. The complexity reduction is achieved by exploiting the suboptimal Layer Detection Order and subcarrier correlation. The simulation results show that huge complexity can be reduced with very small performance loss, by using the proposed detection scheme. For example, 60.7% complexity can be cut off with only 1.1 dB performance loss for the 88 enhanced DPC-OF/TDMA system.