Throughput of RCPT hybrid ARQ for DS-CDMA with diversity reception and rake combining

Deepshikha Garg, Fumiyuki Adachi

    Research output: Contribution to journalConference articlepeer-review

    7 Citations (Scopus)


    In this paper, we evaluate by computer simulations the throughput performance of rate compatible punctured turbo coded hybrid ARQ (RCPT HARQ) for direct sequence code division multiple access (DS-CDMA) with antenna diversity reception and rake combining in a frequency selective Raylelgh fading channel. The impact of a range of transmission system parameters and propagation parameters (viz.: the information sequence length, puncturing rate, spreading factor, number of diversity antennas, fading rate, and the power delay profile of the multipath channel) on the throughput is Investigated. It is found that RCPT HARQ system has the highest throughput when minimum amount of redundancy bits is transmitted with each retransmission. In addition, the evaluations show that over a frequency selective fading channel, the throughput is almost Insensitive to the information sequence length and the fading rate. It is also found that smaller spreading factor (SF) for a given chip rate gives a higher throughput in bps/Hz. Furthermore In the multi-user case, when the number of users is equal to SF, the total throughput for downlink is higher than that for uplink and is more or less independent of SF.

    Original languageEnglish
    Pages (from-to)2730-2734
    Number of pages5
    JournalIEEE Vehicular Technology Conference
    Issue number4
    Publication statusPublished - 2003 Sep 1
    Event57th IEEE Semiannual Vehicular Technology Conference (VTC2003) - Jeju, Korea, Republic of
    Duration: 2003 Apr 222003 Apr 25


    • DS-CDMA
    • Hybrid ARQ
    • Mobile communication
    • Rate compatible punctured turbo codes

    ASJC Scopus subject areas

    • Computer Science Applications
    • Electrical and Electronic Engineering
    • Applied Mathematics


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