本论文从TH-UWB的信号结构特点出发，分析了TH-UWB系统多址干扰与 CDMA系统多址干扰的不同特点，提出了多个低复杂度的多用户检测器。-In this paper, from the TH-UWB signal structure characteristics of an analysis of TH-UWB system with multiple access interference CDMA systems multiple access interference of

OFDMA, Orthogonal Frequency Division Multiple Access is a broad band communication method. Here channel estimation is more crucial. Based on the FFT size used for OFDM transmission method that many number of channel co-efficients are to be estimated

A noncoherent, bandwidth-efficient modulation scheme is proposed for frequency-hopping multiple-access (FH-MA) networks. The proposed scheme is a combination of noncoherent -ary amplitude-shift keying (NMASK) and orthogonal frequency-division

To fully exploit wireless radio resource and, thus, increase spectrum efficiency, cognitive radios shall sense wire- less environments and identify interference to allow opportunis- tic transmissions for secondary systems. Based on Chen et al.