Title :
Unified complex Hadamard transform sequences for multi-carrier CDMA systems
Author :
Gu, Zhenghui ; Xie, Shoulie ; Rahardja, Susanto
Author_Institution :
Inst. for Infocomm Res., Singapore, Singapore
Abstract :
Conventional multi-carrier code-division multiple-access (MC-CDMA) makes use of Walsh-Hadamard sequences to maintain orthogonality among users. We apply recently introduced unified complex Hadamard transform (UCHT) sequences as spreading sequences in MC-CDMA. The quadri-phase UCHT complex sequences are orthogonal and easy to generate. The system bit-error-rate performance is analyzed in frequency selective slow fading channels.
Keywords :
Hadamard transforms; code division multiple access; error statistics; fading channels; sequences; BER; MC-CDMA; Walsh-Hadamard sequences; bit-error-rate; frequency selective fading channel; frequency selective slow fading channels; multi-carrier CDMA; multi-carrier code-division multiple-access; spreading sequences; unified complex Hadamard transform sequences; Autocorrelation; Delay; Error correction; Error correction codes; Fading; Frequency; Multiaccess communication; Multicarrier code division multiple access; Multiple access interference; Performance analysis;
Conference_Titel :
Vehicular Technology Conference, 2004. VTC 2004-Spring. 2004 IEEE 59th
Print_ISBN :
0-7803-8255-2
DOI :
10.1109/VETECS.2004.1390506
