Multiple bit complex bit modulation

Details Multiple bit complex bit modulation Multiple bit complex bit modulation

2006-07-04

2006-07-04

Tran, Khai (Department: 2637)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S316000

Reexamination Certificate

active

07072382

ABSTRACT:
A wireless communications base station (10) having a digital bit modulation function (72) is disclosed. The bit modulation function (72) may be realized by a software routine executable by a programmable device such as a digital signal processor (40), or alternatively by dedicated logic circuitry. The bit modulation function (72) receives a datastream corresponding to the payload, and a scrambling code, each of which include an in-phase component and a quadrature component. The bit modulation function (72) corresponds to a split adder (94) that performs a Gray Code addition of corresponding bits of the in-phase and quadrature data components with corresponding bits of the in-phase and quadrature scrambling code components. The result is a combined in-phase bit and a combined quadrature bit for each bit position in the datastream. The Gray Code addition takes the place of a complex multiplication, thus saving significant processing capacity or reducing circuit complexity.

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patent: 6781980 (2004-08-01), Dajer et al.
patent: 1 005 202 (2000-05-01), None
patent: 2 319 147 (1998-05-01), None

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