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Improved Downlink Performance of Transmit Adaptive Array applying Transmit Antenna Selection  

Ahn, Cheol-Yong (연세대학교 전기전자공학화)
Kim, Dong-Ku (연세대학교 전기전자공학화)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.28, no.3A, 2003 , pp. 111-118 More about this Journal
Abstract
The transmit adaptive array requires the forward link channel information for evaluating the optimum transmit weight vector in which a feedback channel provides transmitter with the forward link channel information. The larger transmit adaptive array is, the higher required rate of feedback channel is. Therefore we consider the system that the N-transmit antenna system is expanded to the 2N-transmit antenna system, while the feedback channel is maintained as that of N-transmit antenna system. The increase of the number of antennas can produce the additional diversity gain, however the insufficient feedback bits assigned to each antenna aggravates the quantization error. In this paper, we propose the transmit antenna selection in order to improve the performance of transmit adaptive array having an insufficient feedback channel information. The effective method to transmit the weight vector is also introduced. System performances are investigated for the case of N=4 corresponding to the antenna selection diversity schemes on the flat fading channel and the multipath fading channel. The simulation results show that the proposed scheme can improve the system performance by 1 dB when the N is expanded to the 2N, while the feedback channel is restricted to that of N-transmit antenna system.
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  • Reference
1 A. Annamalai and C. Tellambura, 'The effects of gaussian weighting errors in hybrid SC/MRC combiners,' in Porc. WCNC'O2, vol. 1, PP. 211-215
2 J. H Winters, 'Optimum Combinin 9 in Digital Mobile Radio with Cochannel Interference,' IEEE J. Select. Areas Common., vo1.SAC-2, no. 4, pp. 528-539,1984   DOI   ScienceOn
3 TR45, TIA/EIA/ISSS-2001.2
4 M, Katz, E. Tiirola, and J. Ylitalo 'Combining Space-Time Block Coding with Diversity Antenna Selection for Improved Downlink Performance', Proc. VTC '01., pp. 178-182, fall 2001
5 J, H. Winters and M. Z. Win, 'Hybrid-selection/ optimum combining,'in Proc. VTC'O1 spring, vol. 1, pp.113-117
6 F. R. Farrokhi, K. J. R. Liu , Leand ros Tassilullas, 'Transmit Beamfor ming and Power Control for Cellular Wireless Systems,' IEEE Journal on Selected Areas in Communications, vol. 16, Pp. 1437-1449, Oct 1998   DOI   ScienceOn
7 M. Z. Win and J. H. Winter, 'Virtual branch analysis of symbol error probability for hybrid selection/ maximal-ratio combining in rayleigh fading,' IEEE Trans. on Comm., voI. 49, no. 11, Nov. 2001, pp. 1926-1934   DOI   ScienceOn