Title :
Smart Antennas for Multi-Rate MC-CDMA Communication Systems
Author :
Tsai, Shang-Chun ; Ueng, Fang-Biau ; Chen, Jun-Da ; Jeng, Li-Der ; Chen, Jian-Wei ; Ke, Kun-Da
Author_Institution :
Dept. of Electr. Eng., Nat. Chung-Hsing Univ., Tainan
Abstract :
This paper proposes and compares three multi- rate receiver structures with post-fast Fourier transform (FFT) type and the pre-FFT type for orthogonal frequency division multiplexing code-division multiple access (OFDM-CDMA) communication systems. In multipath fading channel, the transmitted signal suffers from the effects of inter-chip interference (ICI) and multiple access interference (MAI). In order to solve these problems and support multimedia traffic, we propose three multi- rate methodologies- variable processing gain (VPG), variable chip rate (VCR) and multi-code systems to investigate the performance of the OFDM-CDMA communications in multipath fading environments. Simulations confirm the good performance of the proposed receiver structures.
Keywords :
OFDM modulation; adaptive antenna arrays; code division multiple access; fading channels; fast Fourier transforms; interference (signal); multimedia communication; multipath channels; radio receivers; telecommunication traffic; FFT; MC-CDMA communication systems; OFDM; fast Fourier transform; inter-chip interference; multicode system; multimedia traffic; multipath fading channel; multiple access interference; multirate receiver structure; orthogonal frequency division multiplexing; smart antennas; variable chip rate; variable processing gain; Communication system traffic; Fading; Fourier transforms; Gain; Multiaccess communication; Multicarrier code division multiple access; Multimedia systems; Multiple access interference; OFDM; Traffic control;
Conference_Titel :
Vehicular Technology Conference, 2008. VTC Spring 2008. IEEE
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-1644-8
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2008.119
