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Journal of Shanghai Jiaotong University (Science)

, Volume 16, Issue 6, pp 691–695 | Cite as

Joint user and antenna selection for multiuser MIMO downlink with block diagonalization

  • Wei Liu (刘 伟)Email author
  • Jun Zou (邹 俊)
  • Han-wen Luo (罗汉文)
  • Ji-peng Ma (马继鹏)
Article
  • 120 Downloads

Abstract

User selection is necessary for multiuser multiple-input multiple-output (MIMO) downlink systems with block diagonalization (BD) due to the limited free spatial transmit dimensions. The pure user selection algorithms can be improved by performing receive antenna selection (RAS) to increase sum rate. In this paper, a joint user and antenna selection algorithm, which performs user selection for sum rate maximization in the first stage and then performs antenna selection in the second stage, is proposed. The antenna selection process alternately drops one antenna with the poorest channel quality based on maximum determinant ranking (MDR) from the users selected during the first stage and activates one antenna with the maximum norm of projected channel from the remaining users. Simulation results show that the proposed algorithm significantly outperforms the algorithm only performing user selection as well as the algorithm combining user selection with MDR receive antenna selection in terms of sum rate.

Key words

multiuser multiple-input multiple-output (MIMO) multi-antenna block diagonalization (BD) joint user and antenna selection 

Nomenclatures

\(A_{u_i }\)

Set of active antennas of user u i

\(A_{\pi _i }\)

Set of active antennas of user π i

CBD(n)

Sum rate of the current combination of selected users and activated antennas at the nth loop

K

Total number of users

\(\hat K\)

Number of users in Π, \(\hat K\) = card(Π), where card(·) denotes the cardinality of a set

L

Number of users in ω, L = card(ω)

Nmax

The maximum number of antennas that can be dropped from the selected users in Π

\(N_{u_i }\)

Number of antennas of user u i

\(N_{\pi _i }\)

Number of antennas of user π i

\(N_{\pi _i }^{\min }\)

The minimum number of active antennas required by user π i

\(R_{u_i }\)

Set of remaining inactive antennas of user u i

ui

Index of the ith user in Ω, u i ∈ {1, 2, ..., K}

πi

Index of the ith selected user in Π, π i ∈ {1, 2, ..., K}

Π

Set of users selected during the first stage

Ψ(n)

Set of all active antennas at the nth loop

Ω

Set of users not selected during the first stage

CLC number

TN 929.5 

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References

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Copyright information

© Shanghai Jiaotong University and Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Wei Liu (刘 伟)
    • 1
    Email author
  • Jun Zou (邹 俊)
    • 1
  • Han-wen Luo (罗汉文)
    • 1
  • Ji-peng Ma (马继鹏)
    • 2
    • 3
  1. 1.Department of Electronic EngineeringShanghai Jiaotong UniversityShanghaiChina
  2. 2.State Key Laboratory of Wireless CommunicationsChina Academy of Telecommunications TechnologyShanghaiChina
  3. 3.Leadcore Technology Co., Ltd.ShanghaiChina

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