Time bias estimation and correction method for receiver in burst communication system

Abstract

The invention discloses a time bias estimation method for a receiver in a burst communication system, which includes acquiring the initial estimation value of the time bias immediately by metering the inter-frame gap of multiple beacon frames successful in synchronization at the initial estimation stage of the time bias and regulating the estimation value of the time bias and utilizing a protection mechanism for regulating the estimation value of the time bias after the estimation value exceeds the threshold frequently continuously after the time bias estimation of the burst communication system accesses a stable state. The invention further discloses a time bias correction method for the receiver in the burst communication system according to the estimation value, which includes interpolating received data of frames according to the current estimation value of the time bias to acquire sampling value at an imaginary sampling position by utilizing a transmitter as a beat and then controlling to increase or decrease beat of a local time-base counter. By the methods, the initial convergence rate of time bias estimation can be increased, reliability of stead-state tracking in time bias estimation can be improved, and failure in subsequent frame synchronization caused by synchronization omission or synchronization error of some burst frames is avoided.

Description

technical field [0001] The invention relates to a time offset estimation and correction method of a receiver in a burst communication system with periodic beacon frames. Background technique [0002] With the continuous development of communication technology, the burst communication mode has been widely used in both wired and wireless communication systems. For example, in the HiNOC (High Performance Network over Coaxial Cable, high-performance coaxial cable broadband access network) system, the TDD / TDMA burst communication method is used to transmit bidirectional data signals on a coaxial cable. This system takes the bridge head-end device as a timing reference, and sends out periodic beacon frames on the bridge head-end device. In order to simplify the synchronization and demodulation of the access terminal equipment. [0003] In order to recover the system time offset (that is, the frequency deviation between the receiver's local clock and the transmitter's clock) info...

AI Technical Summary

Problems solved by technology

Of course, this method also faces the problem of intermittently using time offset statistics for time offset estimation; in addition, this method is susceptible to the influence of asymmetric narrowband interference on the spectrum due to the use of the odd symmetry of the signal phase

[0005] The above-mentioned technical solution of extracting time offset statistics from the time domain and frequency domain for time offset estimation still faces another problem: due to the long time of convergence of time offset estimation of these algorithms, in order to speed up the initial locking of the system, it is usually desired that the carrier frequency offset The estimation starts at the same time as the time offset, and the estimation of the carrier frequency offset usually adopts the method of extracting statistics from the time domain correlation output or the phase characteristic of the frequency domain signal, so the two loops of time offset and carrier frequency offset estimation are in the The initial convergence phase is prone to tricky interactions

Due to the existence of time skew, the synchronization miss detection or synchronization error of some burst frames is easy to cause a chain reaction, resulting in the failure of subsequent frame synchronization

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