In this paper we investigate the performance of a multi carrier-code division multiple access (MC-CDMA) system, adopting an adaptive threshold orthogonality restoring combining (TORC) detection technique. The analytical framework we developed allows to derive the value of the threshold that optimizes the performance in terms of bit error probability as a function of the number of subcarriers, the number of active users and the signal-to-noise ratio. This opens the way to an adaptive variation of the threshold following slow processes variations. A not negligible performance improvement, very close to the optimum, but more complex, minimum mean square error (MMSE) technique is shown.
Optimal Threshold Evaluation for TORC Detector of MC-CDMA Systems in Fading Channel
CONTI, Andrea
2006
Abstract
In this paper we investigate the performance of a multi carrier-code division multiple access (MC-CDMA) system, adopting an adaptive threshold orthogonality restoring combining (TORC) detection technique. The analytical framework we developed allows to derive the value of the threshold that optimizes the performance in terms of bit error probability as a function of the number of subcarriers, the number of active users and the signal-to-noise ratio. This opens the way to an adaptive variation of the threshold following slow processes variations. A not negligible performance improvement, very close to the optimum, but more complex, minimum mean square error (MMSE) technique is shown.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
