Low loss interface apparatus between combined frame synchronization coherent detection and soft judgment decoding

Abstract

The present invention discloses a low loss interface device between coherent detection of combined frame synchronization and soft-decision decoding, which relates to a digital signal processing apparatus of anti-fading frame synchronization and low signal-noise ratio loss fading phase ambiguity demodulation. The low loss interface device is composed of an orthogonal down converter, a coherent detector, a soft-decision decoder, a low loss phase ambiguity demodulator, a frame synchronization extractor, a power supply and other components. The low loss interface device adopts a digital signal processing technique, uses frame header information of an encoder / decoder to perform phase recognizing, combines frame synchronization extraction and realizes the low loss interface between the low loss interface between the coherent detection and soft-decision decoder. And the present invention also has features of simple circuit structure, high integration degree, stabilized and reliable performance, portability, low-cost and so on. The low loss interface device is specially suitable as an interface circuit device between the coherent detection and soft-decision decoding in the long-term fading large-capacity communicating system required for low signal-noise ratio loss.

Description

technical field [0001] The invention discloses a low-loss interface device between coherent detection and soft-decision decoding of joint frame synchronization, which is especially suitable for coherent detection and soft-decision decoding in slow-fading large-capacity communication systems requiring low signal-to-noise ratio loss interface circuit device. Background technique [0002] Coherent detection demodulation technology is a commonly used signal demodulation method in communication systems that require a low system threshold, but coherent detection technology itself cannot overcome the phase ambiguity of the receiving signal caused by the channel, but this makes soft decision decoding difficult. The use of the demodulator brings big problems; the traditional demodulator often uses differential demodulation when using soft-decision decoding technology, and the defect of the technical system that uses differential demodulation and soft-decision decoding is: The signal...

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Problems solved by technology

[0002] Coherent detection demodulation technology is a commonly used signal demodulation method in communication systems that require a low system threshold, but coherent detection technology itself cannot overcome the phase ambiguity of the receiving signal caused by the channel, but this makes soft decision decoding difficult. The use of the demodulator brings big problems; the traditional demodulator often uses differential demodulation when using soft-decision decoding technology, and the defect of the technical system that uses differential demodulation and soft-decision decoding is: The loss of signal-to-noise ratio makes the benefits of soft-decision decoding to reduce the demodulation threshold of the system affected

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