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Design of a Baseband Transceiver for Multicarrier CDMA Communications

Abstract

Multicarrier systems have become popular for their spectral efficiency and robustness against frequency-selective fading. Multicarrier code-division multiple access (MC-CDMA) is a technique that combines the advantage of multicarrier modulation with that of code-division multiple access (CDMA) to offer reliable high-data-rate downlink cellular communication services. In this paper, we present the architecture of a downlink baseband transceiver using the MC-CDMA technology under the same bandwidth requirement and channel condition as the third-generation wideband CDMA system. In the transmitter, a scrambling code is applied in order to reduce the peak-to-average power ratio (PAPR) of the transmitter output. In the receiver, we use a joint weighted least-squares (WLS) synchronization error estimation algorithm and a novel channel estimator. Both algorithms greatly enhance the system error-rate performance, as indicated by functional simulation. Simulation results also verify maximum aggregate coded data rates of Mbps from 32/64 users in mobile/stationary multipath fading channel with a 3/4 convolutional code, respectively.

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Correspondence to Pei-Yun Tsai.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License ( https://creativecommons.org/licenses/by/2.0 ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Tsai, PY., Kang, HY. & Chiueh, TD. Design of a Baseband Transceiver for Multicarrier CDMA Communications. EURASIP J. Adv. Signal Process. 2005, 521670 (2005). https://doi.org/10.1155/ASP.2005.1645

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Keywords and phrases

  • multicarrier CDMA
  • baseband transceiver
  • peak-to-average power ratio
  • channel estimation
  • weighted least squares