Fixed wireless loop system that ranks non-assigned PN codes to r

Details Fixed wireless loop system that ranks non-assigned PN codes to r Fixed wireless loop system that ranks non-assigned PN codes to r

1997-12-10

2000-02-08

Ngo, Ricky

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

370342, 370441, H04B 7216, H04J 1302

Patent

active

060234628

ABSTRACT:
Disclosed is a method for operating a fixed wireless system (FWS) having a radio base unit (RBU) that uses a code division multiple access (CDMA) airlink for communicating with a plurality of subscriber units (SUs) within a coverage area of the RBU. The method includes establishing, from a set of pseudonoise (PN) spreading codes, a subset of PN spreading codes that are currently assigned to SUs and a subset of PN spreading codes that are currently not assigned to SUs. The method further ranks the PN spreading codes from the subset of non-assigned PN spreading codes by an amount of interference experienced by the use of each non-assigned PN spreading code, and assigns to an SU requiring a PN spreading code a PN spreading code from the set of non-assigned PN spreading codes that is ranked as having a least amount of interference. The step of ranking the non-assigned PN spreading codes is preferably performed periodically, and includes the steps of assigning, in turn, individual ones of the PN spreading codes from the set of non-assigned PN spreading codes to a correlator of the RBU, and determining an amount of noise output from the correlator resulting from the use of the PN spreading code.

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