TY - GEN
T1 - Efficient soft demodulation of MIMO QPSK via semidefinite relaxation
AU - Nekuii, Mehran
AU - Kisialiou, Mikalai
AU - Davidson, Timothy N.
AU - Luo, Zhi Quan
PY - 2008
Y1 - 2008
N2 - We develop a computationally efficient and memory efficient approach to (near) maximum a posteriori probability demodulation for MIMO systems with QPSK signalling, based on semidefinite relaxation. Existing approaches to this problem require either storage of a large list of candidate bit-vectors, or the solution of multiple binary quadratic problems. In contrast, the proposed demodulator does not require the storage of a candidate list, and involves the solution of a single (efficiently solvable) semidefinite program per channel use. Our simulation results show that the resulting computational and memory efficiencies are obtained without incurring a significant degradation in performance.
AB - We develop a computationally efficient and memory efficient approach to (near) maximum a posteriori probability demodulation for MIMO systems with QPSK signalling, based on semidefinite relaxation. Existing approaches to this problem require either storage of a large list of candidate bit-vectors, or the solution of multiple binary quadratic problems. In contrast, the proposed demodulator does not require the storage of a candidate list, and involves the solution of a single (efficiently solvable) semidefinite program per channel use. Our simulation results show that the resulting computational and memory efficiencies are obtained without incurring a significant degradation in performance.
KW - Bit-interleaved coded modulation
KW - Iterative demodulation and decoding
KW - MIMO soft demodulation
KW - Semidefi-nite relaxation
UR - http://www.scopus.com/inward/record.url?scp=51449105166&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=51449105166&partnerID=8YFLogxK
U2 - 10.1109/ICASSP.2008.4518197
DO - 10.1109/ICASSP.2008.4518197
M3 - Conference contribution
AN - SCOPUS:51449105166
SN - 1424414849
SN - 9781424414840
T3 - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
SP - 2665
EP - 2668
BT - 2008 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP
T2 - 2008 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP
Y2 - 31 March 2008 through 4 April 2008
ER -