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This paper presents an automatic gain control (AGC) algorithm and circuit used in wireless communication receivers with high peak power to average power ratio (PAPR) signal. Combining fixed gain amplifier and programmable attenuator, the AGC function can be implemented by comparing the strength of thresholds with reading two points power detection value of radio frequency (RF) signal. The proposed...
In-phase and quadrature-phase (I/Q) imbalance is a critical issue limit the achievable operating signal- to-noise ratio (SNR) at the receiver in direct conversion architecture. In recent literatures, the second- and fourth-order circularity property of communication signals have been used for designing compensator to eliminate the I/Q imbalance. In this paper, we investigate whether moment circularity...
This paper focuses on performance enhancement for stand-alone Global Navigation Satellite System (GNSS) positioning. To speed up the realization of satellite position, a novel technique is proposed for GNSS satellite orbit fast fitting, which contributes to the acquisition of GNSS satellite signal deeply. The ephemeris orbit model is imminent by different fitting algorithms and polynomial interpolation...
In single constellation, such as GPS, BDS, Galileo or GLONASS, the tracked signals are susceptible under the obstruction with many high buildings or city canyon around. In this case, faulty satellite is just able to be detected by conventional Receiver Autonomous Integrity Monitoring (RAIM), while we cannot identify it with only one redundancy satellite. In this paper, we propose a novel RAIM scheme...
In order to improve the performance of positioning reliability, accuracy, and robustness in Global Navigation Satellite System (GNSS), several special actions, including receiver autonomous integrity monitoring (RAIM), weighted matrix estimation in weighted least squares (WLS), geometric dilution of precision (GDOP) in satellite geometry distribution, need to be taken into consideration in multiconstellation...
Efficient implementation of positioning algorithm plays a crucial role in modern Global Positioning System (GPS). Conventional non-linear Least Squares (LS) method is applied iteratively by Taylor expansion, which doesn't combine different epoch-time for mutual restraint. While with respect to generally used extended Kalman filter (EKF), it requires an accurate system model estimation and exact stochastic...
A low-power transceiver for 802.11n in 65 nm CMOS technology is presented. It supports 2times2 MIMO to satisfy the requirement of the draft 802.11n standard. In receiver chain it shows 5.3 dB low noise figure. In transmit chain an on-chip PA driver delivers 9 dBm output P1dB. -20 to 100degC operation temperature is achieved. A SigmaDelta fractional-N synthesizer is used to support variable reference...
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