MIMO spatial multiplexing systems with uplink pilot and LDPC codec

Authors:
Yang Xiao;Jingli Liu;Huajing Yin;Kiseon Kim
Affiliations:
Institute of Information Science, Beijing Jiaotong University, Beijing, China;Institute of Information Science, Beijing Jiaotong University, Beijing, China;Institute of Information Science, Beijing Jiaotong University, Beijing, China;Dept. of Information and Communications, Gwangju Institute of Science and Technology, Gwangju, Korea
Venue:
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Year:
2009

Citing 1
Cited 0

Asymptotic performance of MIMO wireless channels with limited feedback

MILCOM'03 Proceedings of the 2003 IEEE conference on Military communications - Volume I

Quantified Score

Hi-index	0.00

Visualization

Abstract

This paper investigates two problems of transmit beamforming in MIMO spatial multiplexing (SM) systems: 1. remove the feedback for channel estimation of mobile stations; 2. remove the classical space-time coding of MIMO systems. In the proposed MIMO spatial multiplexing (SM) systems, mobile stations only send uplink pilots in their uplink data transmitting, do not need to estimate spatial channels. Base stations can estimate the MIMO channels by using uplink pilots. For a fixed number of spatial channels and base station and mobile stations all have multiple antennas, we use inversed channel matrix as the beamforming matrix. The proposed scheme has no channel estimation for the mobile stations. Classical space-time coding for mobile stations' implementations is complex and has not provided expected BER, the proposed scheme uses LDPC codec to replace classical space-time coding. Furthermore, LDPC codec deployed at base station and mobile stations can cancel the co-channel interference of MIMO spatial channels. The proposed scheme is shown to allow for effective utilization of spatial spectrums.