Title :
Performance of zero-padded OFDM-CDMA signals
Author :
Ren, Xiaodong ; Zhou, Shidong ; Zhou, Zucheng
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
This paper introduces a type of OFDM-CDMA system that pads OFDM symbols with zeros. We term it ZP-OFDM/CDMA. Like CP-OFDM/CDMA that uses cyclic prefixes, ZP-OFDM/CDMA also enables efficient frequency domain equalization of severe multipath channels. In this paper, we first present the frequency domain equalization method, and analyze the performance of convolutionally coded ZP-OFDM/CDMA over fading AWGN channels, and then derive the upper bound of performance with Viterbi decoding for single user and multiuser cases. Numerical results plot the analyzed performance of ZP-OFDM/CDMA and show that full-loaded multiuser ZP-OFDM/CDMA can provide about I0-6 bit error probability performance when it is convolutionally coded with free distance 20.
Keywords :
OFDM modulation; Viterbi decoding; code division multiple access; convolutional codes; error statistics; frequency-domain analysis; multipath channels; OFDM symbol; Viterbi decoding; bit error probability; convolutionally coded; cyclic prefix; frequency domain equalization; full-loaded multiuser; multipath channel; single user; zero-padded OFDM-CDMA signal; AWGN channels; Convolution; Convolutional codes; Fading; Frequency domain analysis; Multiaccess communication; Multipath channels; OFDM; Performance analysis; Upper bound;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2003. PIMRC 2003. 14th IEEE Proceedings on
Print_ISBN :
0-7803-7822-9
DOI :
10.1109/PIMRC.2003.1259116
