Pilot-Based Channel Quality Reporting for OFDMA/TDD Systems with Cochannel Interference

Yoshitaka HARA  Abdel-Majid MOURAD  Kazuyoshi OSHIMA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E90-B   No.9   pp.2532-2540
Publication Date: 2007/09/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.9.2532
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
Keyword: 
wireless communications,  OFDMA,  TDD,  SINR,  signalling,  channel quality,  

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Summary: 
This paper proposes pilot-based channel quality reporting for orthogonal frequency division multiple access/time division duplex (OFDMA/TDD) systems with cochannel interference. In the proposed method, a terminal reports his channel quality in multiple subbands to base station (BS) using channel reciprocity of TDD systems. The terminal transmits uplink pilot signals in the subbands with different transmit power which is inversely proportional to the subband-based interference power. The BS can obtain knowledge of the terminal's received signal-to-interference-plus-noise power ratio on subband basis, measuring the pilot signal power. In performance evaluation, accuracy of channel quality reporting and amount of uplink signalling are examined. From numerical results, it is found that the proposed method becomes effective as the number of subbands and terminals for channel quality reporting increases.