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This paper presents a reconfigurable decimation filter architecture for reconfigurable multiband GNSS receivers. The proposed filter architecture is designed for a reconfigurable GNSS subsampling receiver, where the sampling process is performed at the Analog to Digital Converter. As the selected sampling rates are much higher than the Nyquist rate, a decimation stage is required to speed up GNSS...
The bandpass sampling technique is a promising solution for the architecture of software-defined radio receivers. It is possible to digitize signals directly from the radio frequency stage when properly selecting the sampling frequency. With multistandard or multiband radio receivers, system nonlinearities mainly due to low noise amplifiers and downconversion circuits can generate rich output spectra...
This paper describes the design of a multi-channel, multi-frequency and reconfigurable GNSS receiver based on RF sampling technique. The design of the receiver RF front-end consists on the determination of the required gain, noise figure and analog to digital converter (ADC) dynamic range and sampling frequency based on GNSS standards specifications. Then, the analysis of noise sources in RF sampling...
This paper presents the design of a reconfigurable Digital Down Converter (DDC) for a quad standard GNSS receiver. By considering GPS, GALILEO, GLONASS and BEIDOU standard specifications, a bandpass RF sampling-based GNSS receiver is designed. After direct digitization of input signals by choosing properly the sampling frequency, an eight-path reconfigurable DDC is proposed before Digital Signal Processing...
The reconfigurability of a radio receiver to support multiple standards has become a big trend in the mobile and wireless industry. In the case of Global Navigation Satellite Systems, the combination of GPS/GALILEO/GLONASS/ COMPASS signals offers customers more and more accuracy and real-time navigation service. This paper presents a new reconfigurable multistandard GNSS receiver architecture that...
In this paper, a new method is proposed to enhance the efficiency of band-pass subsampling for multi-band RF signals in order to relax design specifications for Software Defined Radio receivers. Hence, analytical formulations are defined to calculate the minimum valid sub-sampling frequency by adding specific guard bands around RF signal bands in order to overcome implementation imperfections and...
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