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In this paper a new time domain approach which combines time reversal (TR) and downlink spatial beamforming (BF) is proposed that can result in WB/UWB Interference Mitigation (IM). In order to design the TR filter and the desired beams, the Channel State Information (CSI) between the UWB system and the other wideband (WB) victim users is required. This information is obtained using a hybrid Electromagnetic...
In this work, we propose an interference mitigation technique for ultrawide band (UWB)-impulse radio (IR) systems in the context of cognitive radio (CR). Such technique is based on the design of proper spreading sequences that introduce notch frequencies in both transmitted spectrum and matched filter (MF) receiver. In particular, binary, quaternary and polyphase direct sequence (DS) codes are proposed...
A novel linear blind reduced-rank scheme based on the constrained constant modulus (CCM) design criterion is proposed for interference suppression in direct-sequence ultra-wideband (DS-UWB) systems. The proposed two-stage blind receiver consists of a projection matrix that performs dimensionality reduction and is followed by a reduced-rank filter that produces the output. The projection matrix and...
A sub-band based ultra wideband (SUWB) system is proposed for energy efficient short range wireless communications. The proposed technique divides the bandwidth of 500 MHz into number of sub-bands that may be utilized for higher data rate or higher reliability or multi user access depending on system requirements. The energy efficiency is achieved by reducing the sampling rate requirements and also...
One of the major challenges in direct sequence-ultra wideband (DS-UWB) receiver design is intersymbol interference (ISI). Several equalization schemes to eliminate ISI in DS-UWB systems have been proposed in the literature. It was shown that frequency-domain (FD) equalization techniques can offer better trade off between performance and complexity compared to time- domain equalization schemes for...
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