DocumentCode :
1527684
Title :
Limited Feedback for Temporally Correlated MIMO Channels With Other Cell Interference
Author :
Akoum, Salam ; Heath, Robert W., Jr.
Author_Institution :
Dept. of Electr. & Comput. Eng., Wireless Networking & Commun. Group, Univ. of Texas at Austin, Austin, TX, USA
Volume :
58
Issue :
10
fYear :
2010
Firstpage :
5219
Lastpage :
5232
Abstract :
Limited feedback improves link reliability with a small amount of feedback from the receiver to the transmitter. In cellular systems, the performance of limited feedback will be degraded in the presence of other cell interference, when the base stations have limited or no coordination. This paper establishes the degradation in sum rate of users in a cellular system, due to uncoordinated other cell interference and feedback delay. A goodput metric is defined as the rate when the bits are successfully received at the mobile station, and used to derive an upper bound on the performance of limited feedback systems with delay. This paper shows that the goodput gained from having delayed limited feedback decreases doubly exponentially as the delay increases. The analysis is extended to precoded spatial multiplexing systems where it is shown that the same upper bound can be used to evaluate the decay in the achievable sum rate. To reduce the effects of interference, zero forcing interference nulling is applied at the receiver, where it is shown that the effect of the interference on the achievable sum rate can be suppressed by nulling out the interferer. Numerical results show that the decay rate of the goodput decreases when the codebook quantization size increases and when the Doppler shift in the channel decreases.
Keywords :
Doppler shift; MIMO communication; cellular radio; feedback; interference suppression; precoding; space division multiplexing; Doppler shift; base stations; cell interference; cellular systems; codebook quantization size; decay rate; feedback delay; goodput metric; interference effect reduction; limited feedback systems; link reliability; mobile station; precoded spatial multiplexing; receiver; temporal correlated MIMO channels; transmitter; upper bound; zero forcing interference nulling; Base stations; Degradation; Delay systems; Doppler shift; Feedback; Interference suppression; MIMO; Quantization; Transmitters; Upper bound; Cellular systems; feedback delay; goodput; imperfect CSI; limited feedback precoding; multiple-input–multiple-output (MIMO); other-cell interference; rate outage; temporally correlated channels;
fLanguage :
English
Journal_Title :
Signal Processing, IEEE Transactions on
Publisher :
ieee
ISSN :
1053-587X
Type :
jour
DOI :
10.1109/TSP.2010.2055860
Filename :
5499119
Link To Document :
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