Sphere decoding-based iterative MAP receiver for spatial multiplexing systems

Seung Young Park, Soo Ki Choi, Chung Gu Kang, Ki Ho Kim

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


In this paper, we present a complexity-reduced iterative algorithm for joint maximum a posteriori (MAP) detection and channel estimation in spatial multiplexing systems. To reduce the complexity associated with the MAP detection, which increases exponentially as the number of transmit antennas and the modulation order increase, we propose a modified sphere decoder (SD) algorithm for the MAP detection. It enumerates the symbol sequences with the high extrinsic probabilities, which fall inside a sphere centered at the received signal point at the same time. Extensive simulations demonstrate that the proposed scheme dramatically reduces the complexity as compared to that of the original SD algorithm with moderate performance degradation. Since a degree of the complexity reduction depends on the sphere radius, we also discuss a suitable distance to warrant the good performance/complexity tradeoffs.

Original languageEnglish
Pages (from-to)2324-2328
Number of pages5
JournalIEEE Vehicular Technology Conference
Issue number4
Publication statusPublished - 2003
Event57th IEEE Semiannual Vehicular Technology Conference (VTC2003) - Jeju, Korea, Republic of
Duration: 2003 Apr 222003 Apr 25

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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