Summary
2007 International Symposium on Nonlinear Theory and its Applications
2007
Session Number:17PM2-C
Session:
Number:17PM2-C-2
Reduction of Computational Complexity Using Interference Cancellation in Maximum Likelihood Receiver for SDM Systems
Takahiko Saba, Jun Konishi,
pp.84-87
Publication Date:2007/9/16
Online ISSN:2188-5079
DOI:10.34385/proc.41.17PM2-C-2
Summary:
The maximum likelihood detection (MLD) algorithm is known to be the mathematically optimal approach for detecting signals of space division multiplexing (SDM) systems. However, the computational complexity of MLD increases exponentially according to the number of transmit antennas. This paper proposes the computational complexity reduction scheme exploiting the property of hybrid automatic repeat request (HARQ) for MLDbased receivers in SDM systems. In HARQ scheme, the incorrectly received packet are stored at the receiver. We propose to make use of this stored packet in signal detection. By subtracting the replica signal which is made from the stored packet from the received superposed signal, we can reduce the order of MLD calculation. Simulation results can show the proposed scheme greatly reduces the computational complexity and increase the throughput performance in the SNR region where the retransmissions frequently occur.