In this paper, the impact of timing jitter in direct sequence ultra wideband (DS-UWB) system is investigated over multipath fading channel. Also, a novel hybrid direct sequence multiband UWB (DS-MBUWB) system is proposed to mitigate the impact of timing jitter. We analyze and compare the system performance for conventional DS-UWB and hybrid DS-MB-UWB with Rake receiver in the presence of timing...

A general approach that allows the extension of an CRB-achieving unbiased frequency estimator developed for the AWGN channel to be used for the multipath fading channel by using a periodic transmit sequence is given. The optimality of its performance is guaranteed in a multipath fading channel under certain conditions. The proposed method has low complexity but a reduced frequency operating ran...

The issue of bandwidth scaling has always caused some confusion for channels subject t.o additive white Gaussian noise plus multipath fading. On the one hand, there is an old result (see, for example, section 8.6 of [I]) saying that the capacity of the channel (under 2 power constraint but no bandwidth constraint) is the same as the infinite bandwidth capacity of the non-fading additive noise c...

| In this paper we consider an asyn-chronous direct-sequence code division multiple access (DS-CDMA) communication system operating over an AWGN channel. In certain applications , the near-far problem can be the limiting factor for the capacity of a DS-CDMA system. Several near-far resistant receivers have therefore been proposed (e.g., the decorrelat-ing receiver). These receivers assume perfe...

A model of an angle-spread source, termed the “Gaussian Channel Model” is considered. The cumulative distribution function of the Time-of-Arrival of the multipath components is derived for an arbitrary angle spread. The simple approximate expressions for the Time-of-Arrival cumulative distribution function and probability density function are proposed. Numerical results obtained with the help o...