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–When a mobile station moves, path loss and shadow fading contribute to large-scale variation in the received signal strength. The variation of signal strength caused by shadow fading is a random process, and handover decision mechanisms based on measurements of signal strength induce the " ping-pong effect ". This paper proposes an improved handover(More)
A signal attenuation difference of arrival (SADOA) scheme is proposed to combine with the time difference of arrival (TDOA) method for mobile location estimation. On the basis of ratio of distances between the mobile and base stations derived from differences of signal attenuations, each SADOA measurement yields a circle on which the mobile may lie.(More)
Antenna arrays can be employed in mobile communications to increase channel capacity a s w ell as communication quality via spatially selective recep-tion/transmission at base stations. In most wireless communications systems, directions of arrival of mul-tipath signals need to be found for spatial selective transmission. Unfortunately, due to the coherent(More)
—The variation of signal strength caused by shadowings is a random process, and handover decision mechanisms based on measurements of signal strength induce the " ping-pong effect ". This paper proposes an improved handover algorithm, which identifies the correlation among shadowing components based on the estimates of mobile velocity, to suppress the(More)