DocumentCode :
3249837
Title :
Downlink MC-2D-CDMA over Time-Variant Frequency-Selective Rayleigh Fading Channels
Author :
Fa, Rui ; Sharif, Bayan S. ; Tsimenidis, Charalampos C.
Author_Institution :
Univ. of Newcastle upon Tyne, Newcastle upon Tyne
fYear :
2007
fDate :
24-28 June 2007
Firstpage :
2956
Lastpage :
2960
Abstract :
In this paper, the performance of a downlink synchronous MC-CDMA system with joint frequency-time domain spreading over time-variant frequency-selective Rayleigh fading channels is investigated. We propose an adaptive two dimensional MMSE (minimum mean square error) receiver, which works in decision-directed model after the initial training period. Due to the time variability, a subcarrier phase tracker, which comprises a bank of phase locked-loops (PLLs), is employed in the proposed receiver to track the fading phase variability. Furthermore, a simplified phase tracker structure is proposed to reduce the complexity of system. The theoretical bit error rate (BER) is derived and simulation results indicate that the proposed receiver can achieve good frequency diversity and subcarrier synchronisation, compared to the conventional MCCDMA structures.
Keywords :
Rayleigh channels; code division multiple access; diversity reception; error statistics; least mean squares methods; phase locked loops; time-varying channels; BER; MMSE receiver; PLL; bit error rate; decision-directed model; fading phase variability; frequency diversity; joint frequency-time domain spreading; minimum mean square error; multicarrier-2D-CDMA downlink; phase locked-loops; phase tracker structure; subcarrier phase tracker; time variability; time-variant frequency-selective Rayleigh fading channels; Bit error rate; Communications Society; Diversity reception; Downlink; Fading; Frequency diversity; Mean square error methods; Multicarrier code division multiple access; Phase locked loops; Transmitters;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications, 2007. ICC '07. IEEE International Conference on
Conference_Location :
Glasgow
Print_ISBN :
1-4244-0353-7
Type :
conf
DOI :
10.1109/ICC.2007.491
Filename :
4289162
Link To Document :
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