Environment self-adaptation frequency offset estimating method by simplifying polynomial factors

Abstract

The invention provides an environment self-adaptation frequency offset estimation method by simplifying polynomial factors, which is characterized by comprising the following steps: according to the number Nt of transmitting antennas and a Q value, calculating a parameter rho related to mean square errors of frequency offset estimation, wherein Q=N / P>Nt; Q represents the gap between adjacent non-zero pilot frequencies in a training sequence on the transmitting antennas; N represents the length of the training sequence; P represents the length of a base training sequence; P is less than N and (N)2P is equal to 0; and (N)2P represents to carry out model 2P operation related to N. According to the method, the optimizations related to frequency offset estimation parameters can be realized in a self-adoption mode with the change of the environment, thus realizing the high-accuracy environment self-adoption frequency offset estimation.

Description

Environment Adaptive Simplified Polynomial Factor Frequency Offset Estimation Method technical field The invention relates to an environment self-adaptive frequency offset estimation method that can be applied to a multiple-input single-output or multiple-input multiple-output communication system, and belongs to the technical field of synchronization in mobile communication. Background technique Orthogonal frequency-division multiplexing (OFDM, orthogonal frequency-division multiplexing) is very suitable for wireless communication channel transmission due to its advantages of high spectral efficiency, anti-frequency selective fading and narrow-band interference, and is also the mainstream adopted in the current new generation of mobile communication systems technology. The combination of multiple-input multiple-output technology and OFDM technology can provide greater spectral efficiency and higher data rates; in the current situation where spectrum resources are increasi...

AI Technical Summary

Problems solved by technology

However, due to the time-varying nature of the wireless channel, there will be a frequency offset of the wireless signal during transmission, such as a Doppler shift, or a frequency offset between the carrier frequency of the transmitter and the local oscillator of the receiver

The carrier frequency offset that only accounts for a small part of the subcarrier spacing will destroy the orthogonality between the subcarriers of the OFDM system, and then generate inter-subcarrier interference, resulting in a significant decline in the performance of the OFDM receiver.

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