Precoder codebook design for linear dispersion codes in spatially and temporally correlated MIMO channels

Despite the popularity and importance of linear dispersion (LD) codes, precoding for LD codes has rarely been investigated. In this paper we propose a method for designing a precoder codebook for LD codes in spatially and temporally correlated channels. Our codebook consists of two parts: a unitary...

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Vydáno v:2008 IEEE International Conference on Acoustics, Speech and Signal Processing s. 2933 - 2936
Hlavní autoři: Eunmo Kang, Sayeed, A.M.
Médium: Konferenční příspěvek
Jazyk:angličtina
Vydáno: IEEE 01.03.2008
Témata:
Array signal processing
Block codes
Covariance matrix
Design methodology
Fading
feedback communication
linear dispersion code
MIMO
MIMO systems
Mutual information
precoding
State feedback
Statistics
Transmitters
ISBN:9781424414833, 1424414830
ISSN:1520-6149
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Shrnutí:Despite the popularity and importance of linear dispersion (LD) codes, precoding for LD codes has rarely been investigated. In this paper we propose a method for designing a precoder codebook for LD codes in spatially and temporally correlated channels. Our codebook consists of two parts: a unitary codebook and a diagonal codebook. We propose a systematic algorithm for a unitary code- book design because unitary codebooks are hard to generate using numerical optimization methods. For each column (starting with the first column), we generate a set of vectors in the null space of previous columns. These vectors are generated by skewing i.i.d. unit vector codebooks by means of channel statistics-dependent transformations. A diagonal codebook is generated using a vector quantization technique. We use mutual information as a design criterion throughout this paper. Numerical results illustrate the benefits of matching a codebook to channel statistics and employing adaptive power shaping.
ISBN:9781424414833
1424414830
ISSN:1520-6149
DOI:10.1109/ICASSP.2008.4518264