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List-Based Soft Demodulation of MIMO QPSK via...
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List-Based Soft Demodulation of MIMO QPSK via Semidefinite Relaxation

Abstract

We propose a list-based soft demodulator for MIMO systems that generates the soft information by solving a single semidefinite program (SDP). The computational cost of solving this SDP is guaranteed to be a (low-order) polynomial in the problem size, whereas existing list-based demodulators that employ sphere decoding principles do not have such a guarantee. The proposed demodulator also has a computational advantage over an existing semidefinite-relaxation-based soft demodulator that requires the solution of several SDPs. Our simulation results suggest that these computational advantages are achieved without incurring a significant degradation in performance.

Authors

Nekuii M; Davidson TN

Pagination

pp. 1-5

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

Publication Date

June 1, 2007

DOI

10.1109/spawc.2007.4401313

Name of conference

2007 IEEE 8th Workshop on Signal Processing Advances in Wireless Communications
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