A signal transmission method and device

Abstract

The invention discloses a signal emission method and device. The method and device are applied to a full-duplex wireless communication system in the carrier frequency of millimeter waveband to eliminate interference of an emission signal of an emission antenna array in a reception signal of a reception antenna array of the same transceiver as well as self interference between the emission antenna array and the reception antenna array. The signal emission method comprises that the position of the reception antenna array is determined; and the emission antenna array emits signals by using a wave beam shaping technology. When the signal is emitted in the wave beam shaping technology, the position of the reception antenna array is null position, and the emission antenna array and the reception antenna array are placed in the same transceiver.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to a signal transmitting method and device. Background technique [0002] Full-duplex (Full-duplex) technology is a new technology that has attracted widespread attention in recent years. In the case of applying full-duplex technology, full-duplex wireless communication systems and frequency division duplex (Frequency Division Duplex, FDD) or Compared with the Time Division Duplex (TDD) system, since the transmitted signal and the received signal are carried out at the same frequency at the same time, the transmitted signal will interfere with the locally received received signal. Specifically: [0003] figure 1 shows a schematic structural diagram of a transceiver in a TDD wireless communication system, as figure 1 As shown, in the time division duplex TDD mode, signals are sent and received at different times at the same frequency, and the transmit signal link a...

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Problems solved by technology

[0007] For the full-duplex wireless communication system with the millimeter wave band as the carrier frequency, in the millimeter wave band with a frequency range of 30-300 GHz, many scenarios require the use of multi-element antenna arrays and beamforming technology to compensate for its high propagation loss. Radio frequency and digital two-level interference cancellation technology, the interconnection of the radio frequency part between the transmitting antenna array of m array elements and the receiving antenna array of n array elements will result in an m by n matrix, and the complexity of the digital part is also the same as that of the transmitting antenna The product of the number of digital channels of the array and the receiving antenna array is directly proportional. Obviously, the complexity and cost of the two are too high to be practical

However, the self-interference cancellation is carried out by using the method of transmitting signals from the transmitting antenna at the phase difference π / 2 of the receiving antenna, and the effect of self-interference cancellation will be weakened due to the inaccurate position of the antenna; the method of balun passive cancellation, 5 MHz (Mega Hertz, MHz) bandwidth signals can offset 52 decibels (dB), while 100MHz signals can offset 40dB of transmitted signals, and the offset power decreases as the signal bandwidth increases, and the effect will be worse for millimeter waves

[0008] To sum up, in the full-duplex wireless communication system with the millimeter-wave band as the carrier frequency, the multi-element antenna array is used to compensate the high propagation loss caused by the high carrier frequency by using the beamforming technology, but the full-duplex The self-interference elimination method of industrial wireless communication system is difficult to apply when eliminating the self-interference of multi-element antenna array

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