A New Class of MC-CDMA Systems Using Cyclic-Shift M-ary Biorthogonal Keying

Author

Hwang, Jeng-Kuang ; Chiu, Yu-Lun ; Chung, Rih-Lung

Author_Institution

Commun. Signal Process. Lab., Yuan-Ze Univ.

fYear

2006

fDate

12-15 Dec. 2006

Firstpage

67

Lastpage

70

Abstract

In this paper, a new class of MC-CDMA systems is proposed, which uses cyclic-shift M-ary biorthogonal keying (CS-MBOK) symbol mapping in terms of the polyphase Chu sequence with perfect autocorrelation function. In addition to the basic CS-MBOK mode, we also propose three other transmission modes for more flexible data rate and performance tradeoff in different applications. A low-complexity structure for CS-MBOK code correlation and demapping based on FFT/IFFT is also devised. Compared to the conventional MC-CDMA system, the new system features greatly improved bandwidth efficiency and BER performance, and much lower peak-to-average power ratio (PAPR) of the transmit signal, especially for larger FFT size. Simulation results are included to confirm the above arguments

Keywords

code division multiple access; codes; error statistics; fast Fourier transforms; modulation; BER performance; CS-MBOK code correlation; FFT-IFFT; MC-CDMA systems; autocorrelation function; code demapping; cyclic-shift M-ary biorthogonal keying symbol mapping; peak-to-average power ratio; polyphase Chu sequence; Bandwidth; Biomedical signal processing; Bit error rate; Fading; Frequency diversity; Intersymbol interference; Multiaccess communication; Multicarrier code division multiple access; OFDM; Peak to average power ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Intelligent Signal Processing and Communications, 2006. ISPACS '06. International Symposium on

Conference_Location

Yonago

Print_ISBN

0-7803-9732-0

Electronic_ISBN

0-7803-9733-9

Type

conf

DOI

10.1109/ISPACS.2006.364836

Filename

4212223