Power line communications spread spectrum symbol timing and rand

Details Power line communications spread spectrum symbol timing and rand Power line communications spread spectrum symbol timing and rand

1997-04-28

2000-08-08

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375201, 375202, 375346, 375296, 375259, 37910603, 34031002, 34031003, 34087002, H04B 1500, H04K 100, H04L 2730, H04M 1104

Patent

active

061012149

ABSTRACT:
A system for spread spectrum power line communications employs a harmonic modulation (HM) transmitter coupled to the power line for transmitting message bits to an HM receiver. The spread spectrum accommodates a plurality of HM transmitters simultaneously occupying the same bandwidth. The spectrum of HM, in a frequency range above 60 Hz but below the maximum frequency that will carry through a distribution transformer, is ideal in combating carrier synchronous noise since it can be interleaved with the noise harmonics and therefore be effectively spectrally disjoint with the synchronous noise process spectrum.

REFERENCES:
patent: 5404127 (1995-04-01), Lee et al.
patent: 5519692 (1996-05-01), Hershey et al.
patent: 5519725 (1996-05-01), Hershey et al.
patent: 5581229 (1996-12-01), Hunt
patent: 5844949 (1998-12-01), Hershey et al.
patent: 5903594 (1999-05-01), Saulnier et al.

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