Capacity of a Mobile Multiple-Antenna Communication Link in Rayleigh Flat Fading

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Capacity of a Mobile Multiple-Antenna Communication Link in Rayleigh Flat Fading

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by Thomas L. Marzetta , Bertrand M. Hochwald

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494 - 22 self

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@MISC{Marzetta_capacityof,
    author = {Thomas L. Marzetta and Bertrand M. Hochwald},
    title = {Capacity of a Mobile Multiple-Antenna Communication Link in Rayleigh Flat Fading },
    year = {}
}

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Abstract

We analyze a mobile wireless link comprising M transmitter and N receiver antennas operating in a Rayleigh flat-fading environment. The propagation coefficients between every pair of transmitter and receiver antennas are statistically independent and unknown; they remain constant for a coherence interval of T symbol periods, after which they change to new independent values which they maintain for another T symbol periods, and so on. Computing the link capacity, associated with channel coding over multiple fading intervals, requires an optimization over the joint density of T M complex transmitted signals. We prove that there is no point in making the number of transmitter antennas greater than the length of the coherence interval: the capacity for M> Tis equal to the capacity for M = T. Capacity is achieved when the T M transmitted signal matrix is equal to the product of two statistically independent matrices: a T T isotropically distributed unitary matrix times a certain T M random matrix that is diagonal, real, and nonnegative. This result enables us to determine capacity for many interesting cases. We conclude that, for a fixed number of antennas, as the length of the coherence interval increases, the capacity approaches the capacity obtained as if the receiver knew the propagation coefficients.

Keyphrases

rayleigh flat fading mobile multiple-antenna communication link symbol period coherence interval propagation coefficient joint density many interesting case signal matrix independent matrix new independent value unitary matrix time coherence interval increase receiver antenna transmitter antenna rayleigh flat-fading environment multiple fading interval certain random matrix link capacity mobile wireless link fixed number

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