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

Technical field [0001] The invention relates to an environment adaptive frequency offset estimation method applicable to multiple input single output or multiple input multiple output communication systems, and belongs to the technical field of synchronization in mobile communication. Background technique [0002] Orthogonal frequency-division multiplexing (OFDM) has the advantages of high spectrum efficiency, resistance to frequency-selective fading and narrow-band interference, so it is very suitable for wireless communication channel transmission and is also used in the current new generation of mobile communication systems. Mainstream technology. The combination of multiple input multiple output technology and OFDM technology can provide greater spectrum efficiency and higher data rate; in the current situation of increasingly tight spectrum resources and higher data rate requirements, multiple input multiple output OFDM technology has a broader application prospect. [0003]...

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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