Title :
A family of spread-sequences for CDMA system in a multipath fading channel
Author :
Nallanathan, A. ; Chan, S.C. ; Ng, T.S.
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ., Hong Kong
Abstract :
A new class of orthogonal code-division multiple access (CDMA) system is developed. The key characteristic of the system is that the data symbols are spreaded by a spread-sequence that is longer than the period of the symbol and hence overlapped with the neighboring symbols. Using this approach, temporal diversity is incorporated with other diversities. Due to the temporal diversity, the proposed CDMA system performs well in a fading environment. In this paper, a method for designing such a spread-sequence using filter bank theory is presented. The length of the spread-sequence could be varied according to the requirement. Simulation results show that the proposed spread-sequence based system yields lower BER than the conventional Gold codes based DS/CDMA system
Keywords :
cellular radio; channel bank filters; code division multiple access; diversity reception; fading channels; filtering theory; multipath channels; multiuser channels; sequences; spread spectrum communication; CDMA system; Gold codes; cellular communication; data symbols; fading environment; filter bank theory; multipath fading channel; orthogonal code-division multiple access; satellite communications; simulation results; spread-sequence design; spread-sequence length; temporal diversity; wireless LAN; Bandwidth; Bit error rate; Delay systems; Design methodology; Fading; Filter bank; Gold; Multiaccess communication; Power system modeling; Spread spectrum communication;
Conference_Titel :
Vehicular Technology Conference, 1999 IEEE 49th
Conference_Location :
Houston, TX
Print_ISBN :
0-7803-5565-2
DOI :
10.1109/VETEC.1999.778349
