A Time Difference of Arrival Tracking Method Based on Sooner-Earlier Ring

Abstract

A time difference of arrival tracking method based on the sooner or later loop, comprising the following steps: Step 1: the base station sends a pilot sequence to the mobile station, and the mobile station estimates the initial value of the time difference of arrival (TDOA) of signals received by different antennas; Step 2: the base station uses the mobile station to feedback The TDOA delay factor constructs an orthogonal recovery precoding matrix; Step 3: the mobile station uses the estimated TDOA delay factor to form a sooner or later loop, and the sooner or later loop tracking range is to construct a decoding matrix through the sooner or later loop to respectively decode the received signal; Step 4: Estimate the SNR of the decoding result corresponding to the decoding matrix composed of different delay factors in the sooner or later ring, take the SNR with the largest value among these estimated SNRs, and use its corresponding TDOA delay factor in the sooner or later ring to update The value of the TDOA delay factor is fed back to the base station through the uplink channel; Step 5: the base station constructs a corresponding orthogonal restoration precoding matrix according to the corrected TDOA delay factor.

Description

technical field [0001] The invention belongs to the technical field of a receiving system in a high-speed mobile environment, and relates to a method for tracking a time difference of arrival based on an early-early loop. Background technique [0002] In recent years, the rapid development of high-speed trains (High Speed ​​Train, HST), vehicle networking (Vehicle to X, V2X) and air traffic management (Air Tracffic Management, ATM), especially the high-speed operation of railways has greatly facilitated people's travel , which greatly shortens the running time of trains. The current high-speed railway can reach 350km / h, and it can reach 600km / h or even higher in the next 5 years. While the continuous improvement of train speed brings convenience to people, it also puts forward higher and higher requirements for high-speed railway mobile communication systems. The railway communication business network, railway mobile communication network and basic network are the main part...

AI Technical Summary

Problems solved by technology

Among them, there are some better methods, such as preamble-based timing synchronization estimation, which is more accurate in estimating TDOA parameters, but due to the need to periodically send preamble sequences, the spectrum utilization and data transmission efficiency of the system are reduced to a certain extent

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