하향 다수 사용자 MIMO에서 양자화 채널 벡터 할당에 의한 비트오율 향상

다국어 초록 (Multilingual Abstract)

MIMO technology utilizing spatial multiple access through multiple antennas has been developed for high speed wireless communication. Specially, multi user MIMO was considered instead of single user MIMO to increase channel capacity because many antennas cannot be imbedded inside a small handset. In order to remove the interference between other users, the base station should encode the symbols to be transmitted to users with precodes which are generated by ZF(Zero Forcing) method based on wireless channel vectors of users. Hence, users should send quantized channel vectors to the base station because of a limited overhead but the quantization errors cause a degraded BER. For solving this procblem, this paper presents that the base station can send the quantized channel vector to each user which decodes a received signal by the proper decoder generated from the quantized channel vector.

참고문헌 (Reference)

1 G. Dietle, "channel vector quantization for multiuser MIMO systems aimimg at maximum sum rate" 1-5, 2009

2 K. Kusume, "System level performance of downlink MU-MIMO transmission for 3GPP LTE-advanced" 1-5, 2010

3 C. F. Ball, "Performance analysis of closed and open loop MIMO in LTE" 260-265, 2009

4 정상호, "MIMO 시스템에서 채널용량의 효율성을 위한 프리코딩 개선 연구" 한국정보기술학회 11 (11): 69-74, 2013

5 B. Lim, "Improved User Scheduling Algorithms for Codebook Based MIMO Precoding Schemes" 1-5, 2010

6 F. Boccardi, "Hierarchical quantization and its application to multiuser eigenmode transmission for MIMO broadcast channels with limited feedback" 1-5, 2007

7 M. Wang, "Dynamic Multi-user MIMO Scheduling with Limited Feedback in LTE-Advanced" 1627-1632, 2012

8 C. C. Lee, "Design of 4×4 MIMO-OFDMA Receiver with Precode Codebook Search for 3GPP-LTE" 3957-3960, 2010

9 J. Hang, "Capacity Based Optimal Codebook Construction for MIMO-OFDM Spatial Multiplexing Systems" V2.76-V2.80, 2010

10 H. Jin, "A tradeoff between single-user and multi-user MIMO schemes in multi-rate uplink WLANs" 10 (10): 3332-3342, 2011