Inter-code interference and optimum spreading sequence in frequency-selective Rayleigh fading channels on uplink MC-CDMA

Takashi Shono, Tomoyuki Yamada, Kiyoshi Kobayashi, Katsuhiko Araki, Iwao Sasase

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In uplink multicairier code division multiple access (MC-CDMA), the inter-code interference (ICI) caused by the independent and frequency-selective fading channel of each user and the inter-carrier interference caused by the asynchronous reception of each user's OFDM symbols result in multiple access interference (MAI), This paper evaluates the ICI in frequency-selective Rayleigh fading channels for uplink MC-CDMA. We derive theoretical expressions for the desired-to-undesired signal power ratio (DUR) as a quantitative representation of ICI, and validate them by comparison with computer simulations using a Walsh-Hadamard (WH) code. Based on the analytical results, we obtain the optimum spreading sequence that minimizes the ICI (in short, maximizes the multiplexing performance); this sequence appears to be orthogonal. Three equalization combining methods are examined; equal gain combining (EGC), orthogonality restoring combining (ORC), and maximum ratio combining (MRC).

Original languageEnglish
Pages (from-to)1981-1993
Number of pages13
JournalIEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
VolumeE87-A
Issue number8
Publication statusPublished - 2004 Aug

Fingerprint

Frequency selective fading
Rayleigh Fading Channel
Code Division multiple Access
Uplink
Rayleigh fading
Fading channels
Code division multiple access
Interference
Multiple access interference
Multiplexing
Orthogonal frequency division multiplexing
Computer simulation
Intercarrier Interference
Multiple Access Interference
Equalization
Fading Channels
Orthogonal Frequency Division multiplexing (OFDM)
Orthogonality
Computer Simulation
Maximise

Keywords

  • Desired-to-undesired signal power ratio
  • Inter-code interference
  • MC-CDMA
  • OFDM
  • Spreading sequence

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Hardware and Architecture
  • Information Systems

Cite this

Inter-code interference and optimum spreading sequence in frequency-selective Rayleigh fading channels on uplink MC-CDMA. / Shono, Takashi; Yamada, Tomoyuki; Kobayashi, Kiyoshi; Araki, Katsuhiko; Sasase, Iwao.

In: IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, Vol. E87-A, No. 8, 08.2004, p. 1981-1993.

Research output: Contribution to journalArticle

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AU - Sasase, Iwao

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AB - In uplink multicairier code division multiple access (MC-CDMA), the inter-code interference (ICI) caused by the independent and frequency-selective fading channel of each user and the inter-carrier interference caused by the asynchronous reception of each user's OFDM symbols result in multiple access interference (MAI), This paper evaluates the ICI in frequency-selective Rayleigh fading channels for uplink MC-CDMA. We derive theoretical expressions for the desired-to-undesired signal power ratio (DUR) as a quantitative representation of ICI, and validate them by comparison with computer simulations using a Walsh-Hadamard (WH) code. Based on the analytical results, we obtain the optimum spreading sequence that minimizes the ICI (in short, maximizes the multiplexing performance); this sequence appears to be orthogonal. Three equalization combining methods are examined; equal gain combining (EGC), orthogonality restoring combining (ORC), and maximum ratio combining (MRC).

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