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A semi-blind channel equalisation strategy for the UMTS-TDD downlink

Hadef, M. and Weiss, S. (2004) A semi-blind channel equalisation strategy for the UMTS-TDD downlink. In: 3rd Workshop on the Internet, Telecommunications, and Signal Processing, 2004-12-20 - 2004-12-22.

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In this paper, we propose a semi-blind channel equalisation scheme for the downlink time-division duplex (TDD) component of the universal mobile telecommunication system (UMTS). The main two concepts introduced consist of: first exploiting the constant modulus carried by the decoded symbols of all active users; and second making use of the inactive users to load a suitable number of pilot signals. In response to this scenario, a semi-blind equalisation is performed in the data fields, whereby the equaliser weights are updated by minimising a hybrid CM/MSE cost function based on the constant modulus (CM) criterion for all active users and a mean square error (MSE) criterion for both absent users and pilot signals. Computer simulations are used to assess and analyse the channel equalisation strategy in terms of MSE and BER performance over a quasi-static dispersive channel.