Interference issues in multi-code CDMA networks

Zhao Liu, Mark J. Karol, Magda El Zarki, Kai Y. Eng

Research output: Contribution to conferencePaperpeer-review

10 Scopus citations

Abstract

Multi-Code Direct-Sequence Code Division Multiple Access (MC-CDMA) has been proposed as a flexible multiple access scheme for wireless packet networks that support a large variety of mobiles with different and even time-varying rates. However, the interference model typically used with conventional DS-CDMA cellular systems - a large number of low-power mobiles uniformly distributed in cells - may not hold. In MC-CDMA cellular systems, it is possible for a high-rate mobile, perhaps near the boundary of a cell, to have all the codes for high-rate transmission - therefore transmitting at high power and causing significant interference to the neighboring cell. In this study, we analyze the effects of MC-CDMA intercell interference on the reverse link (i.e., mobile to cell site) and investigate a Maximum Capacity Power Allocation (MCPA) criterion that exploits the sub-code concatenation property of MC-CDMA transmission. When the transmission rate is high, power control with MCPA criterion can significantly reduce reverse-link MC-CDMA intercell interference. However, with only four codes per mobile (e.g., as in IS-95), the reduction in intercell interference is less than 1 dB.

Original languageEnglish
Pages98-102
Number of pages5
StatePublished - 1996
EventProceedings of the 1996 7th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC'96. Part 3 (of 3) - Taipei, Taiwan
Duration: 15 Oct 199618 Oct 1996

Conference

ConferenceProceedings of the 1996 7th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC'96. Part 3 (of 3)
CityTaipei, Taiwan
Period15/10/9618/10/96

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