Title :
An exact error floor for downlink MC-CDMA in correlated Rayleigh fading channels
Author :
Shi, Qinghua ; Latva-aho, Matti
Author_Institution :
Centre for Wireless Commun., Oulu Univ., Finland
fDate :
5/1/2002 12:00:00 AM
Abstract :
Downlink multicarrier code-division multiple access (MC-CDMA) with maximal ratio combining (MRC) in correlated Rayleigh fading channels is considered. An exact error floor in a closed-form expression is provided based on the characteristic function (CF) and residue calculation method. Numerical results show that orthogonal spreading sequences (Walsh and orthogonal Gold sequences) perform better than nonorthogonal sequences (Gold sequences) and Walsh codes have the best performance. In addition, downlink MC-CDMA is found to benefit from the correlation between subcarriers.
Keywords :
Rayleigh channels; code division multiple access; codes; correlation methods; diversity reception; error statistics; multiuser channels; radio links; sequences; spread spectrum communication; BER; Gold sequences; Walsh codes; Walsh sequences; bit error rate; characteristic function; closed-form expression; correlated Rayleigh fading channels; downlink MC-CDMA; exact error floor; maximal ratio combining; multicarrier code-division multiple access; multiple access interference; nonorthogonal sequences; orthogonal Gold sequences; orthogonal spreading sequences; residue calculation method; subcarriers correlation; Bit error rate; Closed-form solution; Diversity reception; Downlink; Fading; Gaussian approximation; Gold; Multiaccess communication; Multicarrier code division multiple access; Multiple access interference;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/4234.1001662
