Experimental evaluation of coherent rake combining for broadband single-carrier DS-CDMA wireless communications

Takehiro Ikeda, Koichi Okwa, Mamoru Sawahashi, Fumiyuki Adachi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

This paper experimentally evaluates the bit error rate (BER) performance of single-carrier broadband DS-CDMA (B-CDMA) scheme using a 100-MHz bandwidth (chip rate of 81.92 Mcps) in frequency-selective multipath fading channels. The achievable information bit rate is 20.36 (2.5) Mbps when the spreading factor (SF) is SF = 4 (32). In order to achieve a high data-rate transmission with high quality (i.e., average BER is below 10-6), we apply pilot symbol-assisted coherent Rake receiving with a large number of Rake fingers (maximum number of Rake fingers is SF × 2), 2-branch antenna diversity reception, convolutional coding, and signal-to-interference power ratio (SIR) measurement-based fast closed-loop transmit power control (TPC). Experimental results show that the average BER of 10-6 for the 20.36 (2.5)-Mbps transmission is achieved at the required average transmit Eb/NO of approximately 6.7 (5.0) dB when the number of multipaths is L = 2 and the maximum fading Doppler frequency is fD = 20 Hz. We also show that Rake time diversity and fast TPC are effective in a broadband propagation channel where many resolvable paths (such as 12 paths) are observed.

Original languageEnglish
Pages (from-to)415-424
Number of pages10
JournalIEICE Transactions on Communications
VolumeE84-B
Issue number3
Publication statusPublished - 2001 Mar

Keywords

  • Broadband DS-CDMA
  • Rake combining
  • Transmit power control
  • Wireless communication

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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