Title :
Comparison of two convolutional orthogonal coding techniques for CDMA radio communications systems
Author :
Chang, Li Fung ; Ling, Fuyun ; Falconer, David D. ; Sollenberger, Nelson R.
Author_Institution :
Bellcore, Red Bank, NJ, USA
fDate :
6/1/1995 12:00:00 AM
Abstract :
For CDMA (code-division multiple-access) wireless communications systems, orthogonal signaling with noncoherent detection has been proposed when a reference phase is not available. In this paper, orthogonal signaling using Walsh signals is considered. Performance of the channel using error-correcting coding together with 1) bit-by-bit interleaving or 2) Walsh word-by-word interleaving is investigated. Simulation results show that for several types of fading and non-fading channels with practical amounts of interleaving and with practical power control, the second technique with complete soft decision decoding that has added complexity in the decoder gives significant reduction in the required signal to interference ratio (SIR) over the first technique
Keywords :
Gaussian channels; Rayleigh channels; Viterbi decoding; Walsh functions; code division multiple access; convolutional codes; fading; interleaved codes; radiocommunication; signal detection; telecommunication signalling; AWGN channel; CDMA radio communications systems; Rayleigh fading channel; SIR reduction; Viterbi decoding; Walsh signals; Walsh word-by-word interleaving; additive white Gaussian noise channel; bit-by-bit interleaving; channel performance; code-division multiple-access; convolutional orthogonal coding; error-correcting coding; fading channels; non-fading channels; noncoherent detection; orthogonal signaling; power control; signal to interference ratio; simulation results; soft decision decoding; wireless communications systems; Convolution; Convolutional codes; Decoding; Fading; Interleaved codes; Multiaccess communication; Phase detection; Power control; Signal detection; Wireless communication;
Journal_Title :
Communications, IEEE Transactions on
