Abstract
Abstract An analytical technique is developed to evaluate the error rate and the minimum mean-square-error (MMSE) performance of linearly equalized Atf-ary quadrature amplitude modulation and quadrature partial response signalling in the presence of adjacent channel interference. Both symbol- and fractionally-spaced linear equalizers (SSE and FSE) are considered. The tap gains of these equalizers are evaluated in the MMSE sense. The transfer function and MMSE of the infinite tap SSE are derived in the presence of interfering channels. The underlying structure of the infinite-tap SSE is used to develop an infinitely long FSE. Numerical results indicate that the proposed structure does not yield the same MMSE as obtained by a sufficiently long FSE. A frequency domain analysis in conjunction with singular value decomposition reveals that the case for the failure of the proposed structure is due to a built-in rank reduced property.
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