Method and device for estimating self-interference channel of CCFD (Co-frequency Co-time Full Duplex) system based on variable window length

Abstract

The invention discloses a method and a device for estimating self-interference channel of CCFD (Co-frequency Co-time Full Duplex) system based on variable window length. The method comprises the following steps: S1, designing pilot symbols orthotropic at near end and far end; S2, receiving a pilot vector of base band interference signal and performing FFT (Fast Fourier Transform Algorithm) conversion on the pilot vector so as to obtain a frequency-domain received interference signal pilot vector Y; S3, performing LS (Least Squares) estimation on Y so as to obtain an LS estimation output vector; S4, performing IDFT (Inverse Discrete Fourier Transform) conversion on the LS estimation output vector so as to obtain a time-domain signal vector; S5, performing time-domain windowing on the time-domain signal vector; S6, performing DFT (Discrete Fourier Transform) conversion on the time-domain signal vector after being windowed. The method and the device solve the problem that the channel estimation precision is worsened since the traditional LS channel estimation is free of nose filtering capacity, the noise effect is fully filtered under the precondition that the channel energy is conserved as much as possible, and the estimation precision of interference channel is improved.

Description

technical field [0001] The present invention relates to interference channel estimation technology in digital self-interference suppression technology, in particular to a method and device for self-interference channel estimation of CCFD system based on variable window length. Background technique [0002] The increasingly scarce spectrum resource is the bottleneck restricting the development of modern wireless communication. The duplex mode of the traditional communication system is divided into time division duplex (TDD) and frequency division duplex (FDD), and uplink and downlink data are transmitted in different time slots and different frequencies respectively. Simultaneous co-frequency full-duplex (CCFD) system, which can transmit uplink and downlink data at the same frequency and at the same time, obtains higher system capacity and spectrum utilization, and has become one of the hotspots of wireless communication research in recent years. [0003] In the CCFD system,...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a CCFD system self-interference channel estimation method and device based on variable window length, the method can select the interference suppression window with the minimum mean square error according to the actual self-interference channel characteristics Long, while suppressing additional interference and thermal noise, the self-interference channel energy is fully preserved, which solves the problem that the traditional LS channel estimation does not have the ability to filter out noise, thereby deteriorating the accuracy of channel estimation. Noise effect, improving self-interference channel estimation accuracy

Images