PHS system position synchronous method based on digital lock phase ring and realizing device

Abstract

The present invention discloses a PHS system position synchronous method based on digital lock phase ring and realizing device, wherein the method comprises steps of recovering synchronous clock by a lock phase ring, synchronizing constant-modulus character of points by using data in system, giving synchronous reference signal by quadratic sum calculation and zero crossing detection, synchronizing bit by using the synchronous reference. The device comprises a multiplier-adder unit, a synchronous reference generator, a local synchronous pulse generator, a digital loop filter, a synchronous mode estimator, a phase error register and a synchronous delay compensator. The method can give accuracy synchronous reference, and has large suitable area and good fault-tolerant capacity.

Description

technical field [0001] The invention belongs to the field of digital communication, and in particular relates to an uplink bit synchronization method of a PHS (Personal Handyphone System, namely "PHS") system based on a digital phase-locked loop. Background technique [0002] In a digital communication system, bit synchronization is an important step before data demodulation, and inaccurate bit synchronization is likely to cause a decrease in demodulation performance and an increase in bit error rate. For adopting (Quadrature Phase Shift Modulation) modulation communication system, taking PHS system as an example, the usual synchronization method is to calculate the energy of the signal at each sampling point after differential decoding, and then determine the synchronization bit according to the principle of maximum energy. This method requires more resources when implemented in hardware, and because two multiplication operations with noise signals are introduced in the d...

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Problems solved by technology

[0004] After analyzing the search results of relevant patents, it is found that in the PHS system, there are two main conventional synchronization methods: one is to use the control word after demodulation to have the largest modulus value of the signal at the synchronization point as the synchronization method Reference, this method introduces two multiplication operations with noise during demodulation, and requires the maximum value of the signal when marking the synchronization reference, which is difficult to implement in hardware, and has a greater impact on the synchronization reference in the presence of noise; The other is to use the correlation of the UW word (user word) in the PHS protocol to correlate it, and its correlation peak is the synchronization position. This method involves correlation and takes up a lot of hardware resources.

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