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In this paper, we propose a novel pre-processing method for the direction-of-arrival (DOA) estimation of multiple sources in multipath environments. In such environments, radio signals impinging on an antenna array can be either uncorrelated, partially correlated or fully correlated (or coherent signals). The proposed pre-processing technique consists of receiving the radio signals at different time...
In spectrum monitoring applications, radio signals are often sampled at the speed of several hundreds of MHz by high-performance analog-to-digital converters (ADC). These wideband IQ samples are generally stored in hard drives for offline monitoring purposes such as direction finding or position location. In such scenarios, the lossless compression and decompression of wideband IQ samples helps in...
A multi-band 900 MHz/1.8 GHz/5.2 GHz low noise amplifier (LNA) which can operate at mobile band of 900 MHz and 1.8 G and WLAN band of 5.2 GHz frequency is proposed. Input matching, noise matching and narrow gain are achieved at three frequency bands by adopting a switched output load and a resistive shunt-feedback circuit. The proposed LNA is designed in TSMC 0.18 um CMOS technology with a supply...
A dual-band RF front-end operating at 2.4 and 5.2 GHz is proposed. The dual-band RF front-end consists of a low noise amplifier and a single balance mixer which can be switched to operate at 2.4 and 5.2 GHz with the same hardware. In order to get the good performances at both frequency bands, the LNA uses a switched effective inductance in the input matching. The proposed RF front-end is designed...
A dual-band low noise amplifier (LNA) which can operate at both 2.4GHz and 5.2GHz frequency band is proposed. Input matching, noise matching and narrow gain are achieved at 2.4GHz and 5.2GHz frequency band by switching the equivalent inductance and resistance of input and output circuits. The proposed LNA is designed in a TSMC 0.18um CMOS technology with a supply voltage of 1.5V. The LNA has gain...
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