Optimal design of uniform rectangular antenna arrays for strong line-of-sight MIMO channels
EURASIP Journal on Wireless Communications and Networking
On analytical derivations of the condition number distributions of dual non-central Wishart matrices
IEEE Transactions on Wireless Communications
ICI analysis of MIMO-OFDM systems with independent phase noise at both transmit and receive antennas
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Nonuniform array design for robust millimeter-wave MIMO links
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Multiple repeater placement for assisting long-range LOS MIMO links
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Repeater-assisted capacity enhancement (RACE) for MIMO links in a line-of-sight environment
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Repeater-assisted capacity enhancement (RACE) for LOS MIMO point-to-multipoint links
MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
Mutual information statistics and beamforming performance analysis of optimized LoS MIMO systems
IEEE Transactions on Communications
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This paper describes a technique for realizing a high-rank channel matrix in a line-of-sight (LOS) multiple-input multiple-output (MIMO) transmission scenario. This is beneficial for systems which are unable to make use of the originally derived MIMO gain given by independent and identically distributed (i.i.d.) flat Rayleigh fading subchannels. The technique is based on optimization of antenna placement in uniform linear arrays with respect to mutual information (MI). By introducing a new and more general 3-D geometrical model than that applied in earlier work, additional insight into the optimal design parameters is gained. We also perform a novel analysis of the sensitivity of the optimal design parameters, and derive analytical expressions for the eigenvalues of the pure LOS channel matrix which are valid also when allowing for non-optimal design. Furthermore, we investigate the approximations introduced in the derivations, in order to reveal when the results are applicable. The LOS matrix is employed in a Ricean fading channel model, and performance is evaluated with respect to the average MI and the MI cumulative distribution function. Our results show that even with some deviation from the optimal design, the LOS MEMO case outperforms the i.i.d. Rayleigh case in terms of MI