Code assignment algorithm for synchronous DS-CDMA links with...

Details Code assignment algorithm for synchronous DS-CDMA links with... Code assignment algorithm for synchronous DS-CDMA links with...

2006-05-23

2006-05-23

Phu, Phuong (Department: 2631)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S130000, C375S146000, C375S147000, C370S310000, C370S329000, C455S562100

Reexamination Certificate

active

07050480

ABSTRACT:
A method is disclosed for operating a synchronous space division multiple access, code division multiple access communications system. The method operates, within a coverage area of a base station (BS) or radio base unit (RBU) having a multi-element antenna array, for estimating a SSV for individual ones of a plurality of active subscriber stations (SSs) and assigns a spreading code to a subscriber station (SS) that minimizes the similarity of the determined SSVs of the SSs in a spreading code set. A metric used to measure the similarity of the spatial signature vectors of the SSs comprises the squared sum of the inner products of same code SSs' SSV with a current SS's SSV. The step of assigning includes calculating the magnitude of the squared inner product of the SSVs of all pairs of active SSs; using the calculated values for determining ξn(c) for each spreading code that is not already used some specified maximum number of times; and assigning to a SS the spreading code with a minimum ξn(c).

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