Quantifying the Performance Gain of Direction Feedback in a MISO System

Author

Zhou, Shengli ; Wu, Jinhong ; Wang, Zhengdao ; Doroslovacki, Milos

Author_Institution

Dept. of Electr. & Comput. Eng., Connecticut Univ., CT

fYear

2006

fDate

22-24 March 2006

Firstpage

573

Lastpage

578

Abstract

We consider finite-rate channel-direction feedback in a system with multiple transmit-antennas and single receive-antenna. We address how the symbol error rate performance improves as a function of the amount of feedback. We conclude that when the number of feedback directions is equal to or larger than the number of transmit antennas, transmit beamforming is optimal even with limited feedback. On the other hand, when the number of feedback directions is smaller than the number of transmit antennas, the antennas are divided into two groups, where antenna selection is used in the first group to choose the strongest channel and equal power allocation is used in the second group. At high SNR, the optimal power allocation between these two antenna groups is proportional to the number of antennas in each group. Based on high SNR analysis, we fully characterize the power gain of each feedback bit.

Keywords

MIMO communication; array signal processing; channel allocation; receiving antennas; transmitting antennas; MISO system; channel allocation; finite-rate channel-direction feedback; multiple input single output system; multiple transmit-antenna; receive-antenna; symbol error rate performance; transmit beamforming; Antenna feeds; Array signal processing; Channel state information; Directive antennas; Error analysis; Fading; Performance gain; State feedback; Transmitters; Transmitting antennas;

fLanguage

English

Publisher

ieee

Conference_Titel

Information Sciences and Systems, 2006 40th Annual Conference on

Conference_Location

Princeton, NJ

Print_ISBN

1-4244-0349-9

Electronic_ISBN

1-4244-0350-2

Type

conf

DOI

10.1109/CISS.2006.286535

Filename

4067876