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A novel configuration for improving the frequency tracking performance of GNSS signals in multipath environments is proposed. The proposed technique is based on combining the weakly correlated outputs of Early, Prompt and Late match filters to exploit the inherent time-delay diversity when severe multipath conditions prevail. By observing more code-phase offsets simultaneously, the loop is more resilient...
GNSS (Global Navigation Satellite System) signal reception in indoor environments is susceptible to spatial fading and signal attenuation. An antenna array utilizing spatial diversity can be implemented to improve detection performance which reduces the required fading margin. However for the typical handheld GNSS receiver, constrained to a single antenna, spatial processing gain is possible only...
Size and cost considerations of handheld terminals limit the use of antenna array for combating multipath fading in these applications. Recently, a synthetic array based on moving a single antenna was proposed for handheld terminals. This technique however fails to provide enough diversity gain when the channel is spatially correlated. A combination technique based on merging polarization and spatial...
A mobile station (MS) antenna is typically undergoing random spatial motion as part of the typical usage which degrades the coherency of the received signal resulting in demodulation losses. However, in a fading environment, the random motion can be constructively exploited in a generalized likelihood ratio test (GLRT) processing scheme resulting in diversity gain. The key outcome is the observation...
This paper describes a hybrid AOA/TODA mobile station (MS) location estimation method based on the CDMA wireless communications signals. The method utilized estimates the angle of arrival (AOA) and time difference of arrival (TDOA) of downlink pilot channel. In this paper, signal parameter estimations including AOA and TDOA, and position estimation challenges in real wireless communications systems...
In this paper, low complexity acquisition of UWB telemetry data packets is addressed. In addition to the usual channel impairments considered of additive white Gaussian noise (AWGN) noise and multipath, the sensor clock is assumed to be unsynchronized relative to the access node such that there is a random clock offset. The proposed method involves a multi-hypothesis outer search over the arrival...
A novel technique to detect the motion of a beacon, i.e., moving station, using a single base station (BS) is demonstrated. The beacon is controlled by a free running crystal oscillator with a random offset error in the range of 2 ppm. The detection principle is based on the estimator correlator (EC) which accounts for the correlation properties of the beacon signal. The real data is collected from...
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