Title :
MC DS/SFH-CDMA systems for overlay systems
Author :
Wang, Jiangzhou ; Huang, Hu
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. of Hong Kong, Kowloon, China
fDate :
7/1/2002 12:00:00 AM
Abstract :
We introduce the slow frequency hopping (SFH) technique to the multicarrier (MC) code-division multiple-access (CDMA) systems for overlay situations. Using lower chip rate, which results in a narrower spectrum for each carrier and hopping the signal in frequency, the MC direct sequence (DS)/SFH system achieves better performance than the MC DS CDMA system in most cases, especially when the bandwidth of the narrowband interference (NBI) is narrower than one subchannel. It also exhibits a stable performance against the variations of the NBI location and bandwidth. When there is no NBI, the two systems perform approximately the same. The evaluation is performed over a frequency selective Rayleigh fading channel, with both Gaussian approximation and Monte Carlo simulation
Keywords :
AWGN channels; Monte Carlo methods; Rayleigh channels; approximation theory; code division multiple access; frequency hop communication; interference suppression; multipath channels; multiuser channels; radiofrequency interference; spread spectrum communication; AWGN channel; Gaussian approximation; MAI suppression; MC DS CDMA system; MC DS/SFH-CDMA systems; Monte Carlo simulation; NBI bandwidth; NBI location; additive white Gaussian noise channel; bandwidth; chip rate; frequency selective Rayleigh fading channel; multiaccess interference; multicarrier code-division multiple-access; multipath fading; narrowband interference; overlay systems; slow frequency hopping; subchannel; Bandwidth; Fading; Filters; Frequency; Gaussian approximation; Interference suppression; Multiaccess communication; Narrowband; Performance evaluation; Robustness;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2002.800543
