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Diversity techniques based on combining uncorrelated or partially correlated signals have proven to be effective for combating signal fading that typifies indoor wireless communication channels. Antenna diversity resulting from combining multiple antennas with different radiation characteristics is one of several diversity techniques, and it can be further subdivided into spatial, polarization, and...
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...
The combined spatial-polarization correlation formulation for a multipath environment based on the uniform sphere of scatters model is developed. The closed-form expressions developed are useful for quantifying the potential diversity gain in antenna diversity systems. An extensive set of measurements were carried out at 1947.5 MHz to verify the theoretical results. The proposed model can be utilized...
This paper analysis the performances of a single antenna handheld receiver in detecting a signal in a Rayleigh multipath fading environment. If the antenna is spatially fixed during the time interval that the signal is sampled then signal coherency is maintained. However, the signal will be subject to statistically large fading losses. The alternative is to spatially translate the antenna along some...
The performances of a single moving antenna receiver in detecting a narrowband signal in a correlated Rayleigh fading is considered. The single moving antenna captures spatial samples during antenna displacement that provides a realization of a synthetic antenna array. It is shown that there is a net processing gain in applying synthetic antenna array over keeping antenna stationary. This processing...
In this paper, a new method for AOA estimation, based on the synthetic ESPRIT algorithm is described and tested with actual CDMA signals. Physical size constraints of handheld devices typically exclude the possibility of using multiple antennas. To overcome this limitation, antenna array can be synthesized by physically moving a single antenna in an arbitrary trajectory while collecting a snapshot...
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