Time offset estimation method and device, storage medium and terminal of ofdm system

Abstract

A time preference method and device, storage medium, and terminal of an OFDM system. int The duration starts to receive data, and the receiving time is 1 sub -frame plus 2n · T int Data to receive data, T int For the offset duration of the preset unit, n is the maximum number of offset lengths supported by the supported unit; the data with a length of 1 subframe from the receiving data is calculated based on the data. f ; int In order to traverse the data to receive data, take out the data of 1 sub -frame and calculate the CFI each time; according to the CFI obtained during the traversal process, determine the number of offset N, n is an integer and ‑n <n nn; calculate the total time bias Δt, of which of which, of which of which, of which, the total partial bias Δt, wherein, of which, Δt = n · t int +T f EssenceThrough the invention plan, it can be achieved when the low complexity and high reliability can be achieved, and the time synchronization requirements of the OFDM system can be met.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and in particular, to a time offset estimation method and device for an OFDM system, a storage medium and a terminal. Background technique [0002] Orthogonal Frequency Divided Multiplexing (OFDM) technology has high spectrum utilization efficiency and excellent anti-intersymbol interference performance, is very suitable for broadband high-speed communication scenarios, and is widely used in wireless mobile communication systems. [0003] OFDM technology divides the channel into multiple parallel orthogonal sub-carriers to transmit data. Timing synchronization is a key issue that affects the accuracy of OFDM channel transmission and is one of the important factors that determine the performance of OFDM systems. Since a large time offset may cause inter-symbol interference and even destroy the orthogonality of subcarriers, a low-complexity and high-reliability timing offset ...

AI Technical Summary

Problems solved by technology

[0004] Existing timing offset estimation techniques mainly include two types: one is based on OFDM cyclic prefix for blind detection and blind estimation, and its disadvantage is that the detected timing offset range is limited; the other is based on Long Term Evaluation (Long Term Evaluation, referred to as Complete timing offset estimation for the training sequence of primary synchronization signal and secondary synchronization signal in LTE) OFDM system, with high complexity and poor noise immunity

Images