Experiments on coherent multicode ds-cdma

Tomohiro Dohi, Yukihiko Okumura, Akihiro Higashi, Koii Ohno, Fumiyuki Adachi

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Direct sequence code division multiple access (DS-CDMA) is a promising candidate for 3rd generation mobile communications systems. We recently proposed a coherent multicode DS-CDMA (CM-CDMA) scheme that uses pilot symbol-aided coherent RAKE, interference power measurement based transmit..power control, orthogonal multicode transmission, and concatenated channel coding. We have implemented a CM-CDMA test-bed for a series of laboratory and field tests using the 2 GHz band. This paper describes the test-bed system and experimental results are presented. It is confirmed that pilot symbol-aided coherent RAKE can reduce the required signal energy per bit-to-interference plus background noise spectrum density ratio (£<,//) by 2-3 dB from that achievable with differential detection. Also shown is that by using both RAKE combining and SIR-based power control the transmit power of mobile stations can be significantly reduced. Measurement results show that the required Eb/I0 degrades only slightly when 24 code-channels (768 kbps) are used since orthogonal Gold sequences are used as short spreading codes. DS-CDMA, pilot symbol-aided coherent RAKE, interference power measurement based power control, orthogonal multicode transmission, test-bed, field test.

Original languageEnglish
Pages (from-to)1326-1331
Number of pages6
JournalIEICE Transactions on Communications
VolumeE79-B
Issue number9
Publication statusPublished - 1996 Jan 1
Externally publishedYes

ASJC Scopus subject areas

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

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