[1] Zhang Yuan,. Downlink cooperative beamforming for MIMO cellular systems [J]. Journal of Southeast University (English Edition), 2010, 26 (3): 379-383. [doi:10.3969/j.issn.1003-7985.2010.03.002]

Copy

Downlink cooperative beamforming for MIMO cellular systems()

Share：

Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

26

Issue:

2010 3

Page:

379-383

Research Field:

Information and Communication Engineering

Publishing date:

2010-09-30

Info

Title:

Downlink cooperative beamforming for MIMO cellular systems

Author(s):

Zhang Yuan

National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China

Keywords:

cellular system;  mutiple-input mutiple-output(MIMO);  cooperative beamforming;  spectral efficiency

PACS:

TN911.2

DOI:

10.3969/j.issn.1003-7985.2010.03.002

Abstract:

In downlink cellular systems using beams, the multiple users in multiple cells should cooperate to generate beams to improve the spectrum efficiency. A mathematical model for the multi-cell multi-user downlink transmission is established, and the gradients of the variables including beamforming filters, receiving filters and transmitting power are calculated. Then, a gradient-project-based cooperative beamforming scheme is proposed in which each user iteratively adjusts beamforming variables in the direction of the gradients and projects onto feasible spaces. The information exchange protocol needed to support the scheme is also described. Simulation results show that the proposed scheme can achieve an average spectral efficiency of about 5 bit/(s·Hz·cell). The results show that cooperative beamforming can improve the spectrum efficiency of the cellular systems.

References:

[1] Venturino L, Prasad N, Wang X. Coordinated linear beamforming in downlink multi-cell wireless networks [J]. IEEE Transactions on Wireless Communications, 2010, 9(4): 1451-1461.
[2] Dahrouj H, Yu W. Coordinated beamforming for the multicell multi-antenna wireless system [J]. IEEE Transactions on Wireless Communications, 2010, 9(5): 1748-1759.
[3] Chae C, Mazzarese D, Inoue T, et al. Coordinated beamforming for the multiuser MIMO broadcast channel with limited feedforward [J]. IEEE Transactions on Signal Processing, 2008, 56(12): 6044-6056.
[4] Sadek M, Tarighat A, Sayed A. A leakage-based precoding scheme for downlink multi-user MIMO channels [J]. IEEE Transactions on Wireless Communications, 2007, 6(5): 1711-1721.
[5] Iltis R, Kim S, Hoang D. Noncooperative iterative MMSE beamforming algorithms for ad hoc networks [J]. IEEE Transactions on Communications, 2006, 54(4): 748-759.
[6] Bertsekas D. Nonlinear programming [M]. Bellmont, MA, USA: Athena Scientific, 1995.
[7] Ye S, Blum R. Optimized signaling for MIMO interference systems with feedback [J]. IEEE Transactions on Signal Processing, 2008, 51(11): 2839-2848.
[8] Rong Y, Hua Y, Swami A. Space-time power schedule for distributed MIMO links without instantaneous channel state information at the transmitting nodes [J]. IEEE Transactions on Signal Processing, 2008, 56(2): 686-701.
[9] The 3rd Generation Partnership Project. TR36.814 Further advancement for E-UTRA physical layer aspects [S]. Sophia Antipolis, France: 3GPP, 2009.

Memo

Memo:

Biography: Zhang Yuan(1977—), male, doctor, associate professor, y.zhang@seu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No.61001103), the National Science and Technology Major Project of China(No.2008ZX03003-005), the National Basic Research Program of China(973 Program)(No.2007CB310603).
Citation: Zhang Yuan. Downlink cooperative beamforming for MIMO cellular systems[J].Journal of Southeast University(English Edition), 2010, 26(3):379-383.

Common functions