Cdma air interface for radio local loop system

Details Cdma air interface for radio local loop system Cdma air interface for radio local loop system

H - Electricity

04

B

H04B 1/69 (2006.01) H04B 1/707 (2006.01) H04B 7/26 (2006.01) H04Q 7/30 (2006.01) H04Q 7/32 (2006.01)

Patent

CA 2189807

The capacity of a code division multiple-access (CDMA) net used for a radio local loop system can be increased by exploiting the fixed nature of subscriber stations (3). Orthogonal spreading codes are used for both the forward (12,16) and reverse links (17) and the transmissions from the subscriber stations (3) are adjusted so thatsignals received at the base station (1) from the subscriber stations (3) are synchronised with respect to their spreading codes to within a chip period. Accurate synchrinisation, time control and carrier frequency error compensation of the code division multiple access transmission from multiple subscriber stations (3) reduces the level of multiple access interference experience on the reverse link (17) (from subscriber to base station) which is normally the principal limiting factor on the capacity of a system employing CDMA. FIG. 1.

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