Combined turbo-code and modulation for CDMA wireless communications

Author

Mohammadi, Atousa H S ; Zhuang, Weihua

Author_Institution

Dept. of Electr. & Comput. Eng., Waterloo Univ., Ont., Canada

Volume

3

fYear

1998

fDate

18-21 May 1998

Firstpage

1920

Abstract

This paper investigates a system of combined turbo-code and M-ary orthogonal signaling for CDMA wireless communications. The performance of the system is studied over an AWGN channel with coherent and noncoherent detection for short frame lengths, with emphasis on the effect of noise correlation between the coded bits. It is shown that eliminating this correlation is important in improving the transmission performance of the system. When a 64-Hadamard signaling is employed, the performance of the system is improved by approximately 0.8 dB at a signal-to-noise ratio (SNR) per information bit of 4 dB, and the improvement increases as the SNR increases. It is also shown that for the bit error rate (BER) of interest in voice communication systems, 8-Hadamard mapping performs almost as well as 64-Hadamard mapping, with less complexity and delay

Keywords

AWGN channels; Hadamard codes; code division multiple access; coding errors; correlation methods; demodulation; error statistics; noise; personal communication networks; phase shift keying; signal detection; turbo codes; 64-Hadamard signaling; 8-Hadamard mapping; 8-PSK; AWGN channel; BER; CDMA wireless communications; M-ary orthogonal signaling; SNR; bit error rate; coded bits; coherent detection; complexity; correlation; delay; modulation; noise correlation; noncoherent detection; personal communication system; short frame lengths; signal-to-noise ratio; system performance; transmission performance; turbo-code; voice communication systems; AWGN channels; Additive white noise; Bit error rate; Decoding; Delay; Gaussian noise; Multiaccess communication; Signal to noise ratio; Turbo codes; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1998. VTC 98. 48th IEEE

Conference_Location

Ottawa, Ont.

ISSN

1090-3038

Print_ISBN

0-7803-4320-4

Type

conf

DOI

10.1109/VETEC.1998.686090

Filename

686090