Abstract
An analysis of the performance of adaptive equalizer that operates in various adverse signal environments of mobile telecommunications is presented. The problem of designing the adaptive equalizer is first formulated as a matrix equation. The conjugate gradient method (CGM) is adopted for solving the matrix equation in an iterative manner. The performance of the equalizer is represented in terms of bit error rate (BER) for a given signal environment that is characterized by the power and number of interferences, noises, etc. It is found that the performance of the equalizer is determined by the covariance matrix of the input data that are characterized not only by the given environmental factors such as signal-to-noise ratio (SNR), intersymbol interferences (ISI), etc. but also by the various posterior factors such as symbol rate at the transmitter, the number of training symbols at each frame, allowed computation time, etc. Taking all these factors into consideration, by means of computer simulation, the performance of equalizers for various values of the environmental parameters is summarized.
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