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16 September 2005 Some effects of mutual coupling and noise on channel capacity between antenna arrays
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Space-time coding techniques can be used to achieve very high spectral efficiencies in highly scattering environments using multiple transmit and receive antennas. At the remote station, there is usually a more limited space allotted to the antenna array than at the base station. Since the spectral efficiency improves with the number of antennas, one is interested in how many antennas can be crammed into the limited space on the remote station. This paper addresses some of the issues which affect the allowable density of antennas in the remote station. In particular, the mutual impedance between antenna elements in the remote array, the correlation between the signal and noise fields received by these elements, and amplifier noise contributions impact on the channel capacity achievable by such arrays. In particular, we assume the transmitter is radiating from nT elements of uncoupled half wave dipoles and knows nothing of the channel. A formula is given for the maximum channel capacity to a receiving array of nR elements, coupled to each other in the presence of ambient noise or interference with a uniform angle of arrival distribution. This formula neglects amplifier noise in the receivers. It is shown that the channel capacity is already determined at the terminals of the receiving array and can not be improved by internal coupling networks following the receiving array. When the propagation is by means of full three dimensional scattering, the channel capacity is unaffected by mutual coupling in the receiving array.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. J. Gans "Some effects of mutual coupling and noise on channel capacity between antenna arrays", Proc. SPIE 5910, Advanced Signal Processing Algorithms, Architectures, and Implementations XV, 591003 (16 September 2005);


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