Receiver design for spatially layered downlink MC-CDMA system

Mikko Vehkaperä; Djordje Tujkovic; Zexian Li; Markku Juntti

doi:10.1109/TVT.2005.844678

Receiver design for spatially layered downlink MC-CDMA system

Mikko Vehkaperä^*
, Djordje Tujkovic
, Zexian Li
, Markku Juntti

^*Corresponding author for this work

Not published at VTT

University of Oulu

Research output: Contribution to journal › Article › Scientific › peer-review

15 Citations (Scopus)

Abstract

One of the most promising candidates for the air interface of the upcoming multiuser broadband communication systems is multicarrier code-division multiple-access (MC-CDMA). In the pursuit for higher data rates and reliability of communication in fading environments, a vast amount of spatial multiplexing and transmit diversity techniques have been recently proposed for the multi-antenna systems. In this paper, we study the receiver design for downlink (base station to mobile) multi-antenna MC-CDMA when layered space-time (LST) architectures and space-time coding techniques are utilized. Due to the inevitable complexity restrictions, sub-optimal chip and symbol-level minimum mean squared error (MMSE) based receiver front-ends are derived. For further improvements in performance, an iterative MMSE based detector with soft co-antenna interference cancellation is designed. Performance of the different algorithms is evaluated in spatially correlated and uncorrelated fading channels. The results demonstrated that the proposed multi-antenna schemes combining recently discovered space-time turbo coded modulation and group-wise LST architectures are able to provide significant improvements both in error rate performance and spectral efficiency over the conventional single-antenna system also in spatially correlated environments. By utilizing iterative processing at the receiver, the considered 4 × 4 system was found to perform within 1.5 dB from the channel outage capacity in a spatially uncorrelated frequency-selective fading channel.

Original language	English
Pages (from-to)	1042-1055
Number of pages	14
Journal	IEEE Transactions on Vehicular Technology
Volume	54
Issue number	3
DOIs	https://doi.org/10.1109/TVT.2005.844678
Publication status	Published - 1 May 2005
MoE publication type	A1 Journal article-refereed

Funding

Manuscript received October 31, 2003; revised November 23, 2004. This research work was supported by the National Technology Agency of Finland, Nokia, the Finnish Defence Forces, Elektrobit, and Instrumentointi. Parts of this paper were presented at the Information Society Technologies Mobile & Wireless Communications Summit, Aveiro, Portugal, June 15–18, 2003 and IEEE International Conference on Communications, Paris, France, July 20–24, 2004. The review of this paper was coordinated by Prof. T. Lok.

Keywords

Fading MIMO channels
Iterative processing
Space-time coding
Spatial multiplexing
Suboptimal receiver interfaces
Turbo coded modulation

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10.1109/TVT.2005.844678

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abstract = "One of the most promising candidates for the air interface of the upcoming multiuser broadband communication systems is multicarrier code-division multiple-access (MC-CDMA). In the pursuit for higher data rates and reliability of communication in fading environments, a vast amount of spatial multiplexing and transmit diversity techniques have been recently proposed for the multi-antenna systems. In this paper, we study the receiver design for downlink (base station to mobile) multi-antenna MC-CDMA when layered space-time (LST) architectures and space-time coding techniques are utilized. Due to the inevitable complexity restrictions, sub-optimal chip and symbol-level minimum mean squared error (MMSE) based receiver front-ends are derived. For further improvements in performance, an iterative MMSE based detector with soft co-antenna interference cancellation is designed. Performance of the different algorithms is evaluated in spatially correlated and uncorrelated fading channels. The results demonstrated that the proposed multi-antenna schemes combining recently discovered space-time turbo coded modulation and group-wise LST architectures are able to provide significant improvements both in error rate performance and spectral efficiency over the conventional single-antenna system also in spatially correlated environments. By utilizing iterative processing at the receiver, the considered 4 × 4 system was found to perform within 1.5 dB from the channel outage capacity in a spatially uncorrelated frequency-selective fading channel.",

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Receiver design for spatially layered downlink MC-CDMA system

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