Adaptive robust spread-spectrum receivers

Stella N. Batalama

doi:10.1109/26.771347

1999-06-01

PRE

Stella N. Batalama *

Michael J. Medley

Psaromiligkos, IN

DOI：10.1109/26.771347

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摘要

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We consider the problem of robust detection of a spread-spectrum (SS) signal in the presence of unknown correlated SS interference and additive non-Gaussian noise. The proposed general SS receiver structure is comprised by a vector of adaptive chip-based nonlinearities followed by an adaptive linear tap-weight filter and combines the relative merits of both nonlinear and linear signal processing. The novel characteristics of our approach are as follows. First, the nonlinear receiver front-end adapts itself to the unknown prevailing noise environment providing robust performance for a wide range of underlying noise distributions. Second, the adaptive linear tap-weight filter that follows the nonlinearly processed chip samples results in a receiver that is proven to be effective in combating SS interference as well, To determine the receiver parameters, me propose, develop, and study three adaptive schemes under a joint mean-square-error (MSE), or a joint bit-error-rate (BER), or a joint MSE-BER optimization criterion. As a side result, we derive the optimum decision fusion filter for receivers that utilize hard-limiting (sign) chip nonlinearities, Numerical and simulation results demonstrate the performance of the proposed schemes and offer comparisons with the conventional matched-filter (MF), the decorrelator, the conventional minimum-variance-distortionless-response (MVDR) filter, and the sign-majority-vote receiver.

Keyword:

code division multiaccess

impulse noise

interference suppression

spread spectrum communication