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A Cyclodespreader Architecture for Detecting Multiple Downlink Aperiodic CDMA Signals

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Abstract

Although a code-division multiple-access (CDMA) system is spectrally efficient and has some immunity against intentional reception, its capacity and performance are generally limited by multiple access interference (MAI) caused by other users. For an aperiodic CDMA system, the spreading sequences span multiple symbol intervals, and the cross-correlations between these sequences, which are a measure of the MAI, are periodic over multiple symbols. In this paper, we present a receiver with a parallel architecture that converts an aperiodic CDMA sequence into a piecewise periodic sequence in each arm. We refer to this receiver as a cyclodespreader because the despreader exploits the cyclostationary property of an aperiodic signal. As a result, the transmitted data can be detected separately in each arm of the receiver using low-complexity conventional algorithms proposed for periodic CDMA systems. The goal of the receiver is to decode several signals received from different cochannel base stations. The performance of the system is evaluated using real aperiodic CDMA signals, and it is compared to that of a conventional matched filter (MF) receiver using the number of correctly decoded messages as the performance measure.

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Authors and Affiliations

  1. Texas Instruments, Dallas, TX, USA

    Vishwanath Venkataraman

  2. Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA, USA

    John J. Shynk

  3. Applied Signal Technology Inc., Sunnyvale, CA, USA

    Richard P. Gooch

Authors
  1. Vishwanath Venkataraman
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  2. John J. Shynk
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  3. Richard P. Gooch
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Corresponding author

Correspondence to John J. Shynk.

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Venkataraman, V., Shynk, J.J. & Gooch, R.P. A Cyclodespreader Architecture for Detecting Multiple Downlink Aperiodic CDMA Signals. Wireless Pers Commun 43, 1553–1567 (2007). https://doi.org/10.1007/s11277-007-9326-8

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  • DOI: https://doi.org/10.1007/s11277-007-9326-8

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