Space division multiple access radio communication system and me

Details Space division multiple access radio communication system and me Space division multiple access radio communication system and me

1997-01-07

1999-06-01

Vo, Nguyen

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

455464, H04B 100

Patent

active

059096497

ABSTRACT:
In the preferred embodiment, a Space Division Multiple Access (SDMA) radio communication system (100) utilizes a base station (101) having a plurality of antenna elements (103) used to transmit and receive to multiple radio communication devices (107, 109) on a same frequency and time channel. A different set of beam forming weights is applied to communications for each radio communication device (107, 109) in such a way as to minimize the interference between the radio communication devices signals. A set of distance metrics is calculated utilizing the sets of weights for each pair of radio communication units sharing a channel. When any distant metric is less than a pre determined threshold value, one of the radio communication devices (107, 109) is reallocated to a new channel or a handover instruction is performed.

REFERENCES:
patent: 5515378 (1996-05-01), Roy, III et al.
patent: 5566209 (1996-10-01), Forssen et al.
patent: 5572221 (1996-11-01), Marlevi et al.
patent: 5577024 (1996-11-01), Malkamaki et al.
patent: 5615409 (1997-03-01), Forssen et al.
patent: 5642353 (1997-06-01), Roy, III et al.
Zetterberg, The Spectrum Efficiency of Base Station Antenna Array System for Spatially Selective Transmission, IEEE Transactions on Vehicular Technology, vol. 44, No. 3, Aug. 1995.

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