J4 ›› 2013, Vol. 40 ›› Issue (4): 149-154.doi: 10.3969/j.issn.1001-2400.2013.04.025

• Original Articles • Previous Articles     Next Articles

Adaptive bit partition algorithm in cooperative distributed antenna systems

GUI Xin1,2;KANG Guixia2;ZHANG Ping1,2   

  1. (1. Beijing Univ. of Posts and Telecommunications, Wireless Technology Innovation Institute, Beijing  100876， China;
    2. Key Lab. of Universal Wireless Communications (BUPT), Ministry of Education, Beijing  100876， China)
  • Received:2012-02-14 Online:2013-08-20 Published:2013-10-10
  • Contact: GUI Xin E-mail:guixin1234@gmail.com

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Abstract:

This paper proposes a new limited feedback bit partition algorithm to minimize the rate loss caused by the channel quantization error, based on the cooperative distributed antenna system (DAS). There are two kinds of interferences in multi-user cooperative DAS: multi-user interference (MUI) within the local cell and inter-cell interference (ICI) from adjacent cells. To suppress these two kinds of interferences, this paper uses the random vector quantization (RVQ) codebook to separately quantize the channel state information (CSI) from the local cell and adjacent cells. Under the condition that uses' total feedback overhead is fixed, we use a two-step optimization method to obtain the optimal solution of the feedback bit number allocated to local and adjacent cells. Simulation results show that the proposed algorithm effectively increases the average transmission rate compared with the equal-bit partition algorithm.

Key words: cooperative distributed antenna system, limited feedback bit partition algorithm, random vector quantization


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