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For multiple access high data rate UWB systems, the inter-symbol-interference (ISI) and multiple access interference(MAI) will influence the performance of the systems. In this paper, a Rake receiver structure is presented with adjusting the tap weights adaptively using recursive least squares(RLS) algorithm, in which the optimal parameters of RLS algorithm can be determined by part of the channel...
This paper presents the bit error probability (BEP) of impulse radio communication systems with Gaussian monocycle as the impulse. Results show that the BEP of asynchronous polarization randomized time-hopping (TH) impulse radio communication systems has no obvious relationship with the order of Gaussian monocycle, but has certain relationship with the width of Gaussian monocycle. The narrower the...
This paper investigates spectrum shaping in ultrawideband (UWB) communications and introduces spectral nulls to limit interference with narrowband signals. In order to achieve the cognitive UWB radio, a design scheme for pulse waveform optimization based on prolate spheroidal wave functions (PSWF) has been investigated for producing the expected spectral notches while matching with the required spectral...
Cognitive radio(CR) technologies have recently received much attention. In this paper, we consider the interference of soft-spectrum adaptation (SSA) modulation ultra wide-band (UWB) to wireless local area network (WLAN). We investigate the effect of the interference to WLAN under the model and scenario proposed by TG 1/8 group. From the simulation, the proposed method has simple structure and shows...
This paper analyzes the performance of IR-UWB (impulse radio ultra wide-band) with different monocycles in the presence of interference generated by the UMTS/WCDMA systems. The bit error rate is derived for the IR-UWB with n-order derivative Gaussian monocycle in the presence of UMTS/WCDMA interference. The relationship between the anti-UMTS interference ability of IR-UWB and the derivative order...
This paper presents a continuous decoding algorithm combined with adaptive equalization for receiving UWB signal in indoor multipath channel. It provides theoretical analysis and simulation results based on multiuser environment. This new algorithm computes initial forward recursion using training sequence needed by the adaptive equalizer, and uses lower constraint length to reduce memory consumption...
Regarding a transmitter and a receiver as two fixed points of the Brownian bridge process, an ultra-wideband (UWB) multipath as a trajectory of the Brownian bridge process, all reflection points of paths situating on the surfaces of obstacles, and adopting two-value phase assumption, a bounded Brownian bridge model (BBBM) for UWB indoor multipath channel is constructed. Using BBBM to simulate a corridor...
Propagation properties of transient electromagnetic pulses, or ultra-wideband (UWB) pulses, are very important for UWB radio communication technology. General characteristics of UWB pulses are studied. The phase properties and the issues of waveform distortion are discussed further. Because of the complexity of phase properties of UWB signals, the analytic methods in time domain are preferred. The...
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