Blind chip-rate equalisation for DS-CDMA downlink receiver
- 1 January 2003
- proceedings article
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 1283-1287
- https://doi.org/10.1109/acssc.2003.1292195
Abstract
A dispersive channel in the DS-CDMA downlink destroys the orthogonality of the synchronous users' spreading sequences. In this paper, we aim to reestablish this orthogonality blindly by means of a common chip-level equaliser. The adaptation algorithm is based on a constant modulus criterion forcing the various user symbols onto a constant modulus, for which a stochastic gradient descent algorithm is derived. This algorithm is structurally similar to a multiple error filtered-X LMS type approach, whereby the equaliser input CM update is replaced by a spreading code filtered version. Various simulations demonstrating the algorithm's convergence and noise performance are presentedKeywords
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