Performance and Analysis of CDM-FH-OFDMA for Broadband Wireless Systems

Frequency-hopping (FH) methods in the Orthogonal frequency division multiplexing access(OFDMA) system,which are to assign user-specific subcarrier to the active users, have been paid much attention to in the broadband wireless communication system. In this paper, we present a novel multiple access scheme, referred to as CDM-FH-OFDMA, which is the extension of FH-OFDMA with code division multiplexing (CDM). This scheme can exploit the frequency diversity gain without the aid of channel coding. And it also can be employed in the multi-cell environment with one frequency reuse factor. Computer simulation demonstrates effectiveness of CDM-FH-OFDMA and the conclusion is followed.