Progressive method for multirate transmission of wireless communication system

In order to meet the various customers' demands, several devices supporting variable data rate from Kbps to Gbps must be equipped on wireless personal area network (WPAN) environment. It causes a high cost and high complexity to satisfy compatibleness within any WPAN devices. Therefore, in this paper, the multi-band orthogonal frequency division multiplexing (MB-OFDM) ultra-wideband (UWB) system is considered with multiple access scheme, time/frequency domain spreading, and dilated dual carrier modulation (DCM) for variable data rate transmission from 20 Kbps to 960 Mbps on only one electronic device in wireless communication. This paper presents the basic idea of the proposed scheme and the method of selecting transmission scheme. It is shown in this paper that the proposed system can accept multiple users and support high rate transmission as well as low rate data transmission, based on the channel evaluation.