Assignment of a carrier frequency in an SDMA radio system

Details Assignment of a carrier frequency in an SDMA radio system Assignment of a carrier frequency in an SDMA radio system

1996-01-22

1998-03-24

Safourek, Benedict V.

Multiplex communications

Communication over free space

Combining or distributing information via frequency channels

370342, 370347, 342367, 455 541, H04B 7208

Patent

active

057320756

ABSTRACT:
To assign a carrier frequency to different mobile stations in a conventional Space Division Multiple Access (SDMA) radio system, the stations are differentiated according to the direction in space from which they transmit radio signals to a base station. In addition, the distances between the base station and the mobile stations are compared. To prevent interference at the receiving site (base station BTS), according to the invention a carrier frequency (f) is assigned to the different mobile stations (MS1 to MS3) only if the directions in space (.THETA.1 to .THETA.3) are sufficiently different and the receive levels (P1 to P3) of the radio signals are sufficiently equal. To that end, each mobile station (MS1 to MS3) is assigned a guard area, which encompasses at least a preselected solid angle (lobe width w) and at most a preselected level space (dynamic range S). Any further mobile station wanting a radio link with the base station on the same carrier frequency (f) must be located in a permissible zone (Z) between the guard areas, which comprises a level range (zP) that is common to all preceding mobile stations. A further guard area is defined with each further connection, and the permissible zone (Z) is determined anew. The full capacity of the carrier frequency (f) is only attained when the permissible zone (Z) becomes so small that it no longer comprises sufficient space for the solid angle (w).

REFERENCES:
patent: 4425639 (1984-01-01), Acampora et al.
patent: 4813036 (1989-03-01), Whitehead
patent: 4965732 (1990-10-01), Roy, III et al.
patent: 5553069 (1996-09-01), Ueno et al.
patent: 5559806 (1996-09-01), Kurby et al.
"The Performance Enhancement of Multibeam Adaptive Base-Station Antennas for Cellular Land Mobile Radio Systems", S. Swales et al, IEEE Transactions on Vehicular Technology, vol. 39, No. 1, Feb. 1990, pp. 56-67.
"Capacity Improvement with Base-Station Antenna Arrays in Cellular CDMA", A. Naguib et al, IEEE Transactions on Vehicular Technology, vol. 43, No. 3, Aug. 1994, pp. 691-698.
"Joint Detection with Coherent Receiver Antenna Diversity in CDMA Mobile Radio Systems", P. Jung et al, IEEE Transactions on Vehicular Technology, vol. 44, No. 1, Feb. 1995, pp. 76-88.

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