In this paper we determine the effects of different diversity schemes on the behavior of a direct-sequence spread spectrum Rake receiver which operates with random spreading sequences, in a multipath channel with arbitrary power delay profile. Two different receiver architectures, the former employing the L instantaneously strongest paths out of the Nr resolved ones, and the latter simply the L first paths out of the received Nr, are confronted in terms of symbol error probability, when an M-level PSK system is assumed. The analytical approach devised for assessing such comparison gives the symbol error probability in terms of simple elementary integrals, and immediately evidences the influence on system behavior of the number of resolved paths, bandwidth occupancy of the signal and power delay profile, with a remarkably moderate computational effort.
Performance trade-offs of different rake receivers / Maffei, R.; Manzoli, U.; Merani, M. L.. - 4:(2002), pp. 1665-1669. (Intervento presentato al convegno 55th Vehicular Technology Conference tenutosi a Birmingham, AL, usa nel 2002).
Performance trade-offs of different rake receivers
Maffei R.;Manzoli U.;Merani M. L.
2002
Abstract
In this paper we determine the effects of different diversity schemes on the behavior of a direct-sequence spread spectrum Rake receiver which operates with random spreading sequences, in a multipath channel with arbitrary power delay profile. Two different receiver architectures, the former employing the L instantaneously strongest paths out of the Nr resolved ones, and the latter simply the L first paths out of the received Nr, are confronted in terms of symbol error probability, when an M-level PSK system is assumed. The analytical approach devised for assessing such comparison gives the symbol error probability in terms of simple elementary integrals, and immediately evidences the influence on system behavior of the number of resolved paths, bandwidth occupancy of the signal and power delay profile, with a remarkably moderate computational effort.
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