Abstract:In this paper, fractional Fourier transform (FrFT) angle was regarded as a kind of time-frequency combined resource, and a novel multi-stream orthogonal frequency division multiplexing (OFDM) technology based on FrFT angle division multiple access (ADMA) was proposed in IEEE802.11g wireless local area network (WLAN) by designing optimal allocation criteria for improving data transmission rate. At the transmitter, multiple streams were modulated by inverse FrFT with different angles, and at the receiver, due to the mutual orthogonality between base functions of identical stream at different sub-channels, and the nearly mutual orthogonality between base functions of different streams at same sub-channels, the inter-stream interference could be perfectly suppressed by correlative detection in FrFT domain. The final simulation results showed that the transmission rate could be improved greatly, comparing with conventional single-stream OFDM technique in IEEE802.11g.