Sample-spaced and fractionally-spaced cir estimation aided decision directed channel estimation for OFDM and MC-CDMA

Abstract

Abstract-The achievable performance of decision-directed channel estimation (DDCE) is analysed in the context of both OFDM and MC-CDMA systems. Two different estimation methods suitable for both OFDM and MC-CDMA systems are considered, which employ samplespaced (SS) as well as fractionally-spaced (FS) a posteriori channel impulse response (CIR) estimators. The performance of both estimation methods is compared and it is shown that the DDCE scheme employing the FS-CIR estimator outperforms its SS-CIR estimator-based counterpart. Furthermore, the FS-CIR estimator-based method exhibits higher robustness to various channel parameters such as the channel's root mean square delay spread. Finally, it is shown that the MC-CDMA system employing the channel estimation scheme advocated outperforms its OFDM counterpart.

Cyclic prefix based time synchronization and comb type channel estimation for SC-FDMA systems over time-varying channels

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