Title :
Variable spreading factor orthogonal polyphase codes for constant envelope OFDM-CDMA system
Author :
Tsai, Yingming ; Zhang, Guodong ; Wang, Xiaodong
Author_Institution :
InterDigital Commun. Corp, Melville, NY
Abstract :
Novel orthogonal polyphase codes with constant envelope design for OFDM-CDMA system are proposed in the paper. The proposed codes can support large number of users and variable spreading factor like Hadamard codes. Proposed orthogonal polyphase codes not only have better periodic auto- and cross correlations than Hadamard codes but also have constant envelope properties which is preferred for uplink/reverse link transmission. New transmitter and receiver architecture and MMSE receiver are proposed for the OFDM-CDMA system using the proposed polyphase codes. Simulation results show that OFDM-CDMA system using proposed polyphase codes has better PAPR and BER performance than OFDM-CDMA system using Hadamard codes and OFDMA system
Keywords :
Hadamard codes; OFDM modulation; code division multiple access; error statistics; frequency division multiple access; least mean squares methods; radio links; BER; Hadamard codes; MMSE receiver; OFDM-CDMA system; OFDMA system; constant envelope system; orthogonal polyphase codes; reverse link transmission; transmitter; uplink link transmission; variable spreading factor codes; Error correction; Error correction codes; Fading; Intersymbol interference; Multiaccess communication; Multiple access interference; OFDM modulation; Peak to average power ratio; Time division multiple access; Wireless communication;
Conference_Titel :
Wireless Communications and Networking Conference, 2006. WCNC 2006. IEEE
Conference_Location :
Las Vegas, NV
Print_ISBN :
1-4244-0269-7
Electronic_ISBN :
1525-3511
DOI :
10.1109/WCNC.2006.1696491
