DocumentCode :
812032
Title :
A nakagami fading phase difference distribution and its impact on BER performance
Author :
Polprasert, Chantri ; Ritcey, James A.
Author_Institution :
Dept. of Electr. Eng., Washington Univ., Seattle, WA
Volume :
7
Issue :
7
fYear :
2008
fDate :
7/1/2008 12:00:00 AM
Firstpage :
2805
Lastpage :
2813
Abstract :
We propose a new model for investigating the impact of complex imperfect channel state information (CSI) over Nakagami-m fading channels. The phase difference between two correlated complex Nakagami random variables (RVs) is proposed and its statistical properties are investigated. A closed-form expression for the distribution is obtained using an approach from [1] and depends on the Nakagami-m parameter and the power correlation coefficient (p) between two correlated complex RVs. A simple approximation is given when p is close to unity. The proposed phase difference is shown to accurately approximate that of the Ricean. We derive the joint density function of this phase difference and its associated correlated envelopes. This is given in a closed form in terms of a generalized hypergeometric function, but the RVs can be easily generated for simulation. We analyze the impact of imperfect CSI on the bit error rate (BER) of uncoded and coded modulation. For uncoded modulation, the average BER and a closed-form expression of the asymptotic BER or error floor are obtained. For coded modulation, we determine the error free feedback bound of bit-interleaved coded modulation with iterative decoding for both perfect and imperfect CSI. We show that imperfect phase estimation is the major cause of the error floor.
Keywords :
Nakagami channels; Rician channels; error statistics; interleaved codes; iterative decoding; modulation coding; statistical analysis; BER; Nakagami fading phase difference distribution; Nakagami-m fading channels; Nakagami-m parameter; Ricean channel; bit error rate; bit-interleaved coded modulation; channel state information; generalized hypergeometric function; iterative decoding; phase estimation; power correlation coefficient; random variables; statistical properties; uncoded modulation; Bit error rate; Channel state information; Closed-form solution; Density functional theory; Fading; Feedback; Interleaved codes; Modulation coding; Nakagami distribution; Random variables;
fLanguage :
English
Journal_Title :
Wireless Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
1536-1276
Type :
jour
DOI :
10.1109/TWC.2008.070184
Filename :
4570247
Link To Document :
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