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With growing demand for high data rates, the mobile network has faced excessive traffic and it seems that one of the few long-term solutions to this problem is employing femtocells which improve capacity and indoors coverage. In the typical femtocell networks, co- and cross-layer interferences caused by simultaneous transmission of macrocell base stations and femtocell access points in the same frequency...
This paper analyses the performance of Hermite orthogonal pulses with Time-Hopping modulation techniques such as TH-PPM TH-BPSK and TH-PSM for Ultra wideband (UWB) communication using UWB S-V Channel-I. It compares the Bit Error Rate (BER) results of modulation techniques obtained with Gaussian pulse, with that of Hermite pulses and proves that Hermite pulses perform better than Gaussian derivatives...
This paper proposes a low complex frequency domain channel estimation for ultra-wideband indoor environment. The channel parameters are the attenuations and delays incurred by the signal echoes along the propagation paths. Time-hopping (TH) modulation with binary symbols is assumed. Codewords span a transmission frame. Frames are separated by a guard time to cope with the channel time dispersion....
This paper deals with timing acquisition in ultra-wideband communications operating in a dense multipath environment. A novel symbol and frame synchronization algorithm is proposed based on the maximum-likelihood criterion. And it exploits the samples of the received signal to estimate the start of the individual frames with respect to a local reference (frame timing) and the location of the first...
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