Digital low power symbol rate detector

Details Digital low power symbol rate detector Digital low power symbol rate detector

1994-07-05

1996-06-04

Chin, Stephen

Pulse or digital communications

Testing

Data rate

375261, 375326, 375328, 375355, 375377, 370 17, 329310, 364725, 327 13, 327 47, H04B 346

Patent

active

055241204

ABSTRACT:
This detector provides a computationally simple digital low power detector of symbol rate, also called baud rate. It uses an approximate Hilbert transform function to create approximate in-phase and quadrature signals. An approximate envelope detector (feature extractor) processes these signals to produce a signal with a strong frequency component at the symbol rate. This signal is then filtered, accumulated, and threshold detected. The approximate in-phase and quadrature signals are formed by a linear sequence of six delay elements, the output of the third delay element being the in-phase signal. A first summer receives the output of the second delay element at a minus input and the output of the fourth delay element at a plus input. A second summer receives the signal input at a minus input and the output of the sixth delay element at a plus input, and drives a right two bit shifter. A third summer receives the output of the right two bit shifter and the output of the first summer and drives both a right one bit shifter and a right three bit shifter, the outputs of which are summed to form the quadrature signal.

REFERENCES:
patent: 4747114 (1988-05-01), Martinez
patent: 5170415 (1992-12-01), Yoshida et al.
patent: 5455847 (1995-10-01), Guilford et al.

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