Adaptive equalisation for downlink UMTS terrestrial radio access

Abstract

In this thesis, we propose a new robust and simple blind multiuser equaliser for downlink DS-CDMA systems, the so-called filtered-R multiple error CM algorithm (FIRMER-CMA) equaliser. The latter has a relatively low computational complexity, shows good convergence behaviour and a BER performance close to the MMSE solution. The FIRMER-CMA is further modified to be readily reconfigured to different modes such as partial loading schemes, multi-rate transmission, and semi-blind adaptation employing the aid of pilots. A considerable complexity reduction is achieved by adopting a novel strategy based on considering a new small virtual population of active users.

The robustness of the FIRMER-CMA to carrier frequency offset is addressed whereby a combined scheme based on FIRMER-CMA equaliser and a blind carrier frequency offset estimator is introduced. Furthermore, convergence speed of the proposed algorithm is increased by introducing an affine projection scheme, and steady state MSE is lowered by adopting a concurrent FIRMER-CMA and decision directed (DD) mode. A system relying on both latter principles is derived whereby substantial performance improvements can be gained over either technique on its own. Finally, a significant gain in data rate and spectrum efficiency is achieved by adopting a new homogeneous burst type and a semi-blind approach based on the proposed algorithm for the UMTS TDD component.

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