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In this paper, we investigate the operation of amplify-and forward (AF) two-hop relay networks in the available of in-phase and quadrature-phase imbalance (IQI) at the relay. A close-form analysis is set up in the high signal-to-interference-plus-noise ratio (SINR) mode, where IQI effects in a top result on the SINR. From there, we can see that the time division factor, the energy conversion coefficient,...
We introduce an algorithm for optimizing sensing parameters including the number of sensing samples and the number of reporting bits of a quantization-based cooperative spectrum sensing scheme in cognitive radio networks. This is obtained by maximizing the network throughput subject to a target detection probability. With Rayleigh fading and energy detector, the proposed algorithm simultaneously optimizes...
This paper presents a novel methodology to design multiplierless digital filters. It is very simple to implement and optimizes the order and the number of adders of the filter. This technique was employed to design two decimators for a 640 MHz-12 bits and a 26 MHz-13 bits Delta Sigma Analog to Digital converters (ΣΔ ADCs). The filters were synthesized in a 65 nm CMOS process. Their power consumption...
This article presents the optimization process for a new architecture of digital-enhanced radio frequency receiver. This receiver is based on combining charge sampling filters and hybrid filter banks techniques. We describe the structure optimization based on a compromise between performance and implementation constraints. We then show the performances evaluation in system-level and electrical level...
This article presents a digital-enhanced radio frequency receiver for fast wide-band spectrum sensing. It is based on charge sampling and hybrid filter bank techniques. The charge sampling method is employed to design analog bandpass filters. Using a hybrid filter bank for wide-band analog-to-digital conversion improves the speed and resolution of the conversion. We propose to use these techniques...
An architecture of cascaded delta-sigma modulator is presented. It attains a significant improvement in achievable SNR, dynamic range and has the additional advantage of reduced sensitivity to switch and op-amp nonlinearities. The design consists of approximating quantizer-gain by functional simulation of the modulator and then keeping this value in view while conceiving digital filters. Digital filters...
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