Distributed Iterative Multiuser Detection through Base Station Cooperation

Open Access
Research Article
Part of the following topical collections:
  1. Theory and Applications in Multiuser/Multiterminal Communications

Abstract

This paper deals with multiuser detection through base station cooperation in an uplink, interference-limited, high frequency reuse scenario. Distributed iterative detection (DID) is an interference mitigation technique in which the base stations at different geographical locations exchange detected data iteratively while performing separate detection and decoding of their received data streams. This paper explores possible DID receive strategies and proposes to exchange between base stations only the processed information for their associated mobile terminals. The resulting backhaul traffic is considerably lower than that of existing cooperative multiuser detection strategies. Single-antenna interference cancellation techniques are employed to generate local estimates of the dominant interferers at each base station, which are then combined with their independent received copies from other base stations, resulting in more effective interference suppression. Since hard information bits or quantized log-likelihood ratios (LLRs) are transferred, we investigate the effect of quantization of the LLR values with the objective of further reducing the backhaul traffic. Our findings show that schemes based on nonuniform quantization of the "soft bits" allow for reducing the backhaul to 1–2 exchanged bits/coded bit.

Keywords

Mobile Terminal Interference Cancellation Multiuser Detection Frequency Reuse Interference Mitigation 

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Copyright information

© Shahid Khattak et al. 2008

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Authors and Affiliations

  • Shahid Khattak
    • 1
  • Wolfgang Rave
    • 1
  • Gerhard Fettweis
    • 1
  1. 1.Vodafone Chair Mobile Communications SystemsTechnische Universität DresdenDresdenGermany

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