A coded convolutional spreading CDMA system with turbo equalization for downlink transmission over a frequency selective fading channel

• Published in: IEEE transactions on communications Vol. 57; no. 2; pp. 573 - 582
• Main Authors: Weerasinghe, N., Watanabe, S., Hashimoto, T., Itoh, S.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.02.2009; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; CDMA; Channels; Code division multiple access; Coding, codes; Complexity; Convolution; Convolutional codes; convolutional spreading; Degradation; Delay; Detection, estimation, filtering, equalization, prediction; Downlink; Equalization; Exact sciences and technology; Fading; fading channel; Frequency division multiaccess; Frequency estimation; Information, signal and communications theory; Maximum likelihood estimation; multi-user interference; Multiaccess communication; path diversity; Radiocommunications; receiver complexity; Receivers; Selective fading; Signal and communications theory; Signal, noise; Spreading; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Transmitters. Receivers; turbo equalization; zero correlation zone (ZCZ) sequences; Performance evaluation; Maximum likelihood sequence estimation; Wireless telecommunication; receiver complexity; zero correlation zone (ZCZ) sequences; Downlink; Iterative method; convolutional spreading; Degradation; path diversity; Frequency selection; Synchronous transmission; Delay time; multi-user interference; Direct sequence; turbo equalization; Fading channels; Fading; Multiple access; fading channel; Convolutional code; Receiver; CDMA; Equalization; Diversity combining; Code division multiple access; Signal to noise ratio

In this paper, a coded convolutional spreading codedivision multiaccess with cyclic prefix (CS-CDMA/CP) system in conjunction with iterative receivers is proposed for synchronous downlink transmission over frequency selective fading channels and its performance is compared with the uncoded CS-CDMA/C...