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Interference cancellation with an array processing MLSE receiver

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3 Author(s)
Bottomley, G.E. ; Ericsson Inc., Reasearch Triangle Park, NC, USA ; Molnar, K.J. ; Chennakeshu, S.

the capacity and transmission quality in cellular systems can be improved by using receivers that mitigate cochannel interference and multipath propagation. In this paper, a class of multichannel maximum likelihood sequence estimation (MLSE) receivers is developed for this purpose. Interference mitigation is accomplished via adaptive antenna arrays, while multipath propagation is combated via MLSE. Practical considerations are included, such as fixed front-end filtering, sampling, and estimation of parameters from received samples. Maximal ratio combining, conventional array processing and metric combining (MC) are shown to be special cases of the proposed receivers. Performance is evaluated for π/4-shift DQPSK, using the parameters and transmission format of the time-division multiple-access (TDMA)-based IS-136 (D-AMPS) digital cellular standard. Semi-analytical performance predictions are developed which confirm simulation trends. The results show that these receivers can operate at significantly lower carrier-to-interferer (C/I) levels than conventional MC receivers

Published in:

Vehicular Technology, IEEE Transactions on  (Volume:48 ,  Issue: 5 )

Date of Publication:

Sep 1999

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