Title :
A frame synchronization scheme for uplink MC-CDMA
Author :
Kim, Sang Hyo ; Ha, Kilsik ; Lee, Choong Woong
Author_Institution :
Image Comm. Lab., Seoul Nat. Univ., South Korea
Abstract :
Most present synchronization techniques for downlink MC-CDMA (multi-carrier code division multiple access) are not suitable for uplink MC-CDMA because users´ signals reach the base station asynchronously. In this paper, a frame synchronization scheme for uplink MC-CDMA with asynchronous transmission is suggested. This technique uses a time domain signal which is produced when the spreading code of MC-CDMA is given in the frequency domain. The correlation of already known information, that is, IDFT of the spreading code and sampled received signal, becomes the metric of frame synchronization. In order to obtain good correlation characteristics in the time domain, a new spreading code scheme is suggested. The proposed scheme uses no other information than already known spreading code and does not need FFT operation. Also, the scheme performs well in multipath fading channels
Keywords :
code division multiple access; correlation theory; fading channels; frequency-domain analysis; mobile radio; multipath channels; signal sampling; spread spectrum communication; synchronisation; time-domain analysis; IDFT; asynchronous transmission; base station; correlation; frame synchronization scheme; frequency domain; multi-carrier code division multiple access; multipath fading channels; sampled received signal; spreading code; time domain signal; uplink MC-CDMA; Base stations; Binary phase shift keying; Demodulation; Frequency estimation; Frequency synchronization; Multiaccess communication; Multicarrier code division multiple access; OFDM modulation; Timing; Transmitters;
Conference_Titel :
Vehicular Technology Conference, 1999. VTC 1999 - Fall. IEEE VTS 50th
Conference_Location :
Amsterdam
Print_ISBN :
0-7803-5435-4
DOI :
10.1109/VETECF.1999.797326
