상세정보
학술지
Channel Quantization for Block Diagonalization with Limited Feedback in Multiuser MIMO Downlink Channels
- 저자
- 문성현, 이상림, 김진성, 이인규
- 발행일
- 201402
- 출처
- Journal of Communications and Networks, v.16 no.1, pp.1-9
- ISSN
- 1229-2370
- 출판사
- 한국통신학회
- 협약과제
- 14MI9100, (통합)초연결 스마트 모바일 서비스를 위한 5G 이동통신 핵심기술개발, 정현규
- 초록
- Block diagonalization (BD) has been proposed as a simple and effective technique in multiuser multiple-input multipleoutput (MU-MIMO) broadcast channels. However, when channel state information (CSI) knowledge is limited at the transmitter, the performance of the BD may be degraded because inter-user interference cannot be completely eliminated. In this paper, we propose an efficient CSI quantization technique for BD precoded systems with limited feedback where users supported by a base station are selected by dynamic scheduling. First, we express the received signal-to-interference-plus-noise ratio (SINR) when multiple data streams are transmitted to the user, and derive a lower bound expression of the expected received SINR at each user. Then, based on this measure, each user determines its quantized CSI feedback information which maximizes the derived expected SINR, which comprises both the channel direction and the amplitude information. From simulations, we confirm that the proposed SINR-based channel quantization scheme achieves a significant sum rate gain over the conventional method in practical MU-MIMO systems. © 2014 KICS.
- KSP 제안 키워드
- Amplitude information, Broadcast Channel, CSI Feedback, Channel State Information(CSI), Conventional methods, Dynamic scheduling, Feedback information, Lower bound, MIMO system, Multiple data streams, Multiple input multiple output(MIMO)