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Subspace-based estimation method of uplink FIR channel in MC-CDMA system without cyclic prefix over frequency-selective fading channel

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3 Author(s)
Wu, Xiaojun ; Inst. of Inf. Eng., Xi''an Jiaotong Univ., China ; Qinye Yin ; Jianguo Zhang

The multipath nature of the wireless channel can be described as a finite impulse response (FIR) filter, which easily results in hostile intersymbol interference (ISI). Usually, multicarrier code-division multiple access (MC-CDMA) systems combat the hostile ISI with the aid of the cyclic prefix (CP). Nevertheless, the elimination of ISI in MC-CDMA systems is at the cost of reduction in spectral efficiency. To recover spectral efficiency, it is meaningful to investigate MC-CDMA systems without CP. This paper explores the estimation of the uplink FIR channel in the MC-CDMA system without CP. We interpret the MC-CDMA system without CP as an equivalent time-domain ISI-corrupted direct sequence (DS-) CDMA system. Based on subspace techniques, an uplink FIR channel estimation scheme is derived for the MC-CDMA system without CP. Simulations demonstrate the validity and the performance of the proposed uplink FIR channel estimation scheme.

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Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on  (Volume:1 )

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