DocumentCode :
2080056
Title :
On the use of feedback in multiple antenna common information broadcasting
Author :
Au-Yeung, Chun Kin ; Love, David J.
Author_Institution :
Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN
fYear :
2008
fDate :
26-29 Oct. 2008
Firstpage :
713
Lastpage :
717
Abstract :
Common information broadcasting, or multicasting, wireless systems send the same message to multiple users simultaneously. The problem of multiple antenna multicasting using limited feedback is considered, where a transmitter with MT antennas transmits common information to K users, each equipped with a single antenna. We propose a novel optimization criterion that leads to a higher overall throughput than the traditional max-min criterion can achieve. This is made possible as we leverage channel quality fluctuations among the users by coding the common information over multiple coherence times. Doing so frees ourselves from constraining our coding rate to accommodate the worst user at every coherence time. Generally the user with the poorest channel conditions dictates the multicast throughput. Hence quantizing the channel vector´s magnitude is arguably as important as quantizing the channel vector´s direction, unlike the downlink broadcast channel where directional quantization is paramount to reduce interference while magnitude quantization is less important. We use a simple linear combination of separate magnitude and directional distance functions to create a minimum distance codebook. In our simulations, we show that when K is large and when coding over many coherence periods, our proposed scheme appreciably outperforms traditional Max-Min criterion.
Keywords :
antenna arrays; broadcast channels; minimax techniques; quantisation (signal); radio transmitters; wireless channels; channel quality fluctuations; common information broadcasting; downlink broadcast channel; magnitude quantization; maxmin criterion; multiple antenna multicasting; multiple coherence; transmitter; wireless systems; Antenna feeds; Broadcasting; Coherence; Downlink; Feedback; Fluctuations; Quantization; Throughput; Transmitters; Transmitting antennas; Max-Min criterion; limited feedback; modified Max-Min criterion; physical layer multicast;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signals, Systems and Computers, 2008 42nd Asilomar Conference on
Conference_Location :
Pacific Grove, CA
ISSN :
1058-6393
Print_ISBN :
978-1-4244-2940-0
Electronic_ISBN :
1058-6393
Type :
conf
DOI :
10.1109/ACSSC.2008.5074501
Filename :
5074501
Link To Document :
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