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2-D spatial smoothing for multipath coherent signal separation

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2 Author(s)
Hongyi Wang ; Lucent Technol., Whippany, NJ, USA ; Liu, K.J.R.

The use of two-dimensional spatial smoothing (SS) to increase channel capacity of wireless communications system is discussed, The necessary and sufficient conditions on array configuration for applying SS to multiple signal classification (MUSIC), and adaptive beamforming algorithms are defined and proved, This array must have an orientational invariance structure with an ambiguity free center array, and the number of subarrays must be larger than or equal to the size of the largest group of coherent signals. We also studied the cause of ambiguities in a multipath environment. We found the necessary and sufficient conditions for a three-sensor array manifold to be ambiguity free and identified several higher order ambiguity situations, If an array is also central symmetric, the forward/backward SS (FBSS) can be used to improve the resolution. Finally, we extended our results to the estimation of signal parameters via rotational invariance techniques (ESPRIT). All the predicted results are verified by simulations

Published in:

Aerospace and Electronic Systems, IEEE Transactions on  (Volume:34 ,  Issue: 2 )

Date of Publication:

Apr 1998

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