Title :
Interference cancellation with an array processing MLSE receiver
Author :
Bottomley, Gregory E. ; Molnar, Karl J. ; Chennakeshu, Sandeep
Author_Institution :
Ericsson Inc., Reasearch Triangle Park, NC, USA
fDate :
9/1/1999 12:00:00 AM
Abstract :
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
Keywords :
adaptive antenna arrays; array signal processing; cellular radio; channel capacity; cochannel interference; differential phase shift keying; digital radio; fading channels; interference suppression; maximum likelihood sequence estimation; multipath channels; multiuser channels; quadrature phase shift keying; receivers; time division multiple access; time-varying channels; π/4-shift DQPSK; D-AMPS; IS-136 digital cellular standard; MLSE receivers; TDMA; adaptive antenna arrays; array processing; array processing MLSE receiver; capacity; carrier-to-interferer; cellular systems; cochannel interference; fixed front-end filtering; interference cancellation; interference mitigation; maximal ratio combining; metric combining; multichannel maximum likelihood sequence estimation; multipath propagation; parameter estimation; performance evaluation; sampling; simulation; time varying fading environment; time-division multiple-access; transmission format; transmission quality; Adaptive arrays; Antenna arrays; Antennas and propagation; Array signal processing; Diversity reception; Filtering; Interchannel interference; Interference cancellation; Maximum likelihood estimation; Sampling methods;
Journal_Title :
Vehicular Technology, IEEE Transactions on
