A method for receiving simultaneous and same-frequency full-duplex signals

Abstract

The invention discloses a method for receiving simultaneous and same-frequency full-duplex signals. The method includes: using a baseband signal to be transmitted as a self-interference reference signal, and performing primary self-interference cancellation on the received signal after constructing self-interference; and passing the primary self-interference cancellation signal through The timing synchronization loop realizes the timing recovery at the best sampling point of the useful signal by resampling a, and after the timing error signal in the timing synchronization loop is low-pass filtered, the resampling b1 and resampling b2 are controlled to realize the self-sampling respectively The optimal sampling point recovery of the interference reference signal and the received signal; use the resampled self-interference reference signal and the received signal to perform joint self-interference cancellation and equalization, and then complete the reception of the useful signal through signal demodulation. Through the above method, the self-interference cancellation capability of simultaneous co-frequency full-duplex can be significantly enhanced, and the reception performance of useful signals can be improved.

Description

technical field [0001] The invention relates to the field of wireless communication and signal processing, in particular to a simultaneous and same-frequency full-duplex signal receiving method. Background technique [0002] Simultaneous same-frequency full-duplex technology means that the sending and receiving links of the device work on the same time slot and the same frequency band. Compared with the existing half-duplex technology (including time division duplex and frequency division duplex), it can theoretically be used Spectrum efficiency increased by 100%. With the increasing shortage of spectrum resources and the increasing demand for wireless transmission rates, the simultaneous same-frequency full-duplex technology has become one of the core technologies of B5G / 6G, and has attracted widespread attention in academia and industry. However, simultaneous same-frequency full-duplex technology faces prominent self-interference, and its power may far exceed the useful s...

AI Technical Summary

Problems solved by technology

[0005] The main problem of the prior art solution is poor self-interference cancellation capability

The signal after self-interference cancellation includes self-interference residual, useful signal and noise, which will be used as the driving signal for self-interference adaptive reconstruction, and the actual driving signal is only self-interference residual, so useful signal and noise will interfere with self-interference Eliminate adverse effects

Due to the existence of useful signals, it is difficult to control the residual self-interference to a negligible level, so if the cancellation result is directly regarded as the useful signal, the receiver sensitivity will be significantly deteriorated compared to the half-duplex system

At the same time, in the case of poor self-interference cancellation, the timing synchronization loop is also affected by self-interference residuals

Although the self-interference cancellation effect can be improved to a certain extent by reducing the step factor of adaptive adjustment, it will greatly reduce the convergence speed

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