Title :
CS-CDMA/CP with the Chu Sequence: A Bandwidth-Efficient Multi-Access Scheme for Fast Fading Multipath Channels
Author :
Yue, Li ; Han, Chenggao ; Hashimoto, Takeshi
Author_Institution :
Dept. of Electron. Eng., Univ. of Electro-Commun., Chofu, Japan
Abstract :
In this paper, convolutional spreading CDMA with cyclic prefix (CS-CDMA/CP) employing the zero-correlation-zone (ZCZ) code generated from the Chu sequence is proposed as a novel multi-access scheme for fast fading multipath channels. Analysis results demonstrate that the system remains approximately multiuser interference (MUI)-free even when the system is heavily loaded and subject to severe Doppler spreads. An effective channel estimation method based on B-spline approximation is also proposed. Simulation results show, in combination with the Probabilistic Data Association (PDA) equalization, the system significantly outperforms the DS-CDMA system employing Linear Minimum Mean Squared Error (LMMSE) chip-wise equalization and polynomial interpolation-based channel estimation from medium to high user population.
Keywords :
channel estimation; code division multiple access; fading channels; interference (signal); B-spline approximation; CS-CDMA-CP; Chu sequence; Doppler; LMMSE chip-wise equalization; MUI; PDA equalization; ZCZ code; bandwidth-efficient multi access scheme; channel estimation method; cyclic prefix; fast fading multipath channel; linear minimum mean squared error chip-wise equalization; multiuser interference; polynomial interpolation; probabilistic data association equalization; zero-correlation-zone code; Approximation methods; Channel estimation; Doppler effect; Fading; Multiaccess communication; Spline; Wireless communication;
Conference_Titel :
Communications (ICC), 2011 IEEE International Conference on
Conference_Location :
Kyoto
Print_ISBN :
978-1-61284-232-5
Electronic_ISBN :
1550-3607
DOI :
10.1109/icc.2011.5962501
