Blind joint equalization and multiuser detection in dispersive MC-CDMA/MC-DS-CDMA/MT-CDMA channels

Walid Nabhane, H. Vincent Poor

Research output: Contribution to conferencePaper

18 Scopus citations

Abstract

The problem of demodulation of multiuser Orthogonal Frequency Division Multiplex-Code Division Multiple Access (OFDM-CDMA) in the presence of both Multiple Access Interference (MAI) and Inter Symbol Interference (ISI) is considered. Three types of OFDM-CDMA are presented: Multi-Carrier Code Division Multiple Access (MC-CDMA), Multi-Carrier Direct Sequence Code Division Multiple Access (MC-DS-CDMA) and Multi-Tone Code Division Multiple Access (MT-CDMA). The dispersive OFDM-CDMA channel is first cast into a Multiple Input Multiple Output (MIMO) signal framework. Then using a subspace method, it is shown that each user's channel impulse response can be estimated using the knowledge of the user's signature waveform. It is further shown that, using the user's channel impulse response and the identified signal subspace, a blind linear Minimum Mean Square Error (MMSE) detector and a blind zero-forcing decorrelator detector can be constructed in closed form. The proposed detectors are attractive for their higher spectral efficiency, which is achieved by the elimination of cyclic prefix and training sequences. Further a comparison of MC-CDMA/MC-DS-CDMA/MT-CDMA with Direct Sequence Code Division Multiple Access (DS-CDMA) is then presented. The major contribution of this paper is the development of these sub-space blind techniques for joint suppression of MAI and ISI for the most general cases of MC-CDMA/MC-DS-CDMA/MT-CDMA channels.

Original languageEnglish (US)
Pages814-819
Number of pages6
StatePublished - Dec 1 2002
Event2002 MILCOM Proceedings; Global Information GRID - Enabling Transformation Through 21st Century Communications - Anaheim, CA, United States
Duration: Oct 7 2002Oct 10 2002

Other

Other2002 MILCOM Proceedings; Global Information GRID - Enabling Transformation Through 21st Century Communications
CountryUnited States
CityAnaheim, CA
Period10/7/0210/10/02

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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    Nabhane, W., & Poor, H. V. (2002). Blind joint equalization and multiuser detection in dispersive MC-CDMA/MC-DS-CDMA/MT-CDMA channels. 814-819. Paper presented at 2002 MILCOM Proceedings; Global Information GRID - Enabling Transformation Through 21st Century Communications, Anaheim, CA, United States.