PSK modulation with an error correction memory

Details PSK modulation with an error correction memory PSK modulation with an error correction memory

1988-11-21

1990-03-13

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 67, 332161, H03C 308

Patent

active

049088408

ABSTRACT:
In a modulation circuit, a variable frequency carrier is modulated by a binary PSK (phase shift keying) modulator with the digital signal of a selected data channel. A plurality of error correction values are stored in storage locations of a memory corresponding to the channels, each of the error correction values being representative of a deviation of the inherent operating characteristic of the modulator when operating at a particular frequency of the carrier from a predetermined operating characteristic. The carrier is generated by a channel synthesizer and its frequency is varied corresponding to the selected channel. The memory is addressed to read an error correction value from one of the storage locations corresponding to the selected channel. An error correction circuit is provided to correct the deviation in response to the error correction value read out of the memory.

REFERENCES:
patent: 4321706 (1982-03-01), Craft
patent: 4696017 (1987-09-01), Masheff et al.

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