By Millikan R. A., Cameron G. H.
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Extra resources for Evidence That the Cosmic Rays Originate in Interstellar Space
When i? x x is just the identity matrix (times a constant), so that W = C*. To visualize interference suppression, first consider the case of no multipath. Fig. 6 shows a line-of-sight system with a desired user 1 and an interfering user 2 arriving from different angles. In this case, the weights generate an antenna pattern with the main beam in the direction of the desired signal and a null in the direction of the interference. Thus, the spatial dimension is utilized to increase the signal-to-interference-plus-noise ratio.
Paulraj, A. J. and Kailath, T. (1994). Increasing capacity in wireless broadcast systems using distributed transmission/directional reception. S. Patent 5,345,599. , and Calderbank, A. R. (1998). Space-time codes for high data rate wireless communication: Performance criterion and code construction. IEEE Trans. Inf. Theory, 44 (2), 744-765. Telatar, I. E. (1999). Capacity of multi-antenna Gaussian channels. Eur. Trans. , 10 (6), 585-595. Zheng, L. and Tse, D. N. C. (2003). Diversity and multiplexing: A fundamental tradeoff in multiple antenna channels.
D. 9 bits/s/Hz and the ideal maximum with equal eigenvalues is 8 bits/s/Hz. It is interesting to compare with the deterministic case of Fig. 4. 7 do not exist in the many-scatterer case—they were a result of the particular case with only two scatterers. Even at large spacing it is apparent that the richness (or capacity) is less than for the Rayleigh case due to the small, but nonzero correlations. It should also be emphasized that these results neglect mutual coupling, which in general will have the effect of reducing correlations and increasing capacity, bringing them closer to the Rayleigh case, independent of spacing.