A sphere decoder with approximate QR decomposition for frequency-selective channels

Luis G. Barbero, Pei Xiao, T. Ratnarajah, Mathini Sellathurai, C. F N Cowan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper presents a method to significantly reduce the preprocessing complexity of the sphere decoder (SD) in frequency-selective channels. The method consists of calculating an approximate QR Decomposition (AQRD) of the channel matrix, making use of its special Toeptliz and block-Topelitz structure in single and multiple-antenna frequency-selective channels, respectively. The AQRD obtains the QR decomposition of a small submatrix of the channel matrix and extends that result to the rest of the matrix, resulting in a considerable complexity reduction compared to the original full QR Decomposition (FQRD). Simulation results show that, despite the lower complexity of the AQRD, it causes only a small bit error rate (BER) performance degradation in the SD.

Original languageEnglish
Title of host publicationIEEE International Conference on Communications
DOIs
Publication statusPublished - 13 Aug 2010
Event2010 IEEE International Conference on Communications, ICC 2010 - Cape Town, United Kingdom
Duration: 23 May 201027 May 2010

Conference

Conference2010 IEEE International Conference on Communications, ICC 2010
CountryUnited Kingdom
CityCape Town
Period23/05/1027/05/10

Keywords

  • Approximate QR decomposition
  • Frequency-selective MIMO channel
  • Sphere decoder

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