Null steering inhibition communication method based on pre-coding
A technology of null suppression and communication method, applied in baseband system components, polarization/direction diversity, shaping network in transmitter/receiver, etc., can solve the problems of enhanced interference effect, inability to achieve, and large structure , to achieve the effect of suppressing the nulling problem of the radiation pattern and achieving low complexity
Inactive Publication Date: 2015-12-09
SHANDONG INST OF AEROSPACE ELECTRONICS TECH
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Problems solved by technology
If the number of synthetic antenna elements is increased, it is found by simulation that after configuring 4 antennas, the number and depth of nulls are worse than those of 2 antennas
The reason is that the unit antenna has a wider lobe, and the increase in the number of antennas directly leads to the enhancement of the interference effect. Therefore, it has a more obvious negative effect on omnidirectional coverage.
Try two optimization ideas, change the width of the slot to reduce the lobe width of the azimuth plane, but it will cause a large change in the antenna impedance; divide the 4 antennas into two groups, and shorten the distance between the antennas in each group to reduce the distance between the antenna groups. interference, but cannot be achieved because the structural size is larger than the electrical size
Therefore, under the premise of using slot antennas, it is not suitable to use the configuration of 4 antenna elements
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[0031] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0032] In order to optimize the problem of nulls generated by the synthesis of antenna elements, the causes of nulls are analyzed first. The same signal is sent from the two antennas simultaneously to any continuous space position. As the space coordinates move, the angle between it and the transmitting antenna array changes accordingly, and the distance difference between the point and the two antenna units also changes accordingly. This will cause the phase difference of the two electromagnetic field signals to change continuously. At a certain position, the phases of the two signals are the same, the amplitude of the synthesized signal will increase, and it will appear as a peak on the direction diagram, while at another position, the phase of the two signals will be opposite, and the amplitude of the synthesized signal will decrease, which will be refl...
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The invention discloses a null steering inhibition communication method based on pre-coding. A space-time block coding technology is adopted in processing at a sending end. The problem of spatial null steering is converted into time domain fluctuation. The phenomenon that the quality of received signals is deteriorated due to space angle and position constraints when a conventional antenna receiver is used is avoided. Null steering of a radiation pattern produced by antenna unit synthesis is inhibited. Therefore, time diversity gain is obtained, and the overall directive gain of the two antennas can be up to 0dBi. Moreover, the sending method is low in implementation complexity. By synthesizing multiple wide-beam-slot antenna units, 360-degree spherical circular polarization of a directional pattern is realized.
Description
technical field [0001] The invention relates to the technical field of wireless communication, in particular to a precoding-based null trap suppression communication method. Background technique [0002] For wireless communication application scenarios that need to achieve omnidirectional coverage, it should be able to cover the space within the sphere, and try to avoid dumb blind spots. At the same time, it should be ensured that the directional gain pattern is as uniform as possible and the out-of-roundness is small. In addition, the size of the antenna should be as small as possible to meet the needs of practical applications. [0003] In order to achieve ideal coverage, the antenna pattern that should be constructed should be 360° spherical circular polarization. In order to achieve this goal, the beam width of the unit antenna should be wide, but the beam width of the microstrip antenna is limited, so the slot antenna is considered. From the perspective of the unit p...
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Login to View More IPC IPC(8): H04B7/08H04B7/10H04L1/06H04L25/02H04L25/03
Inventor 于洋刘继超邹海明
Owner SHANDONG INST OF AEROSPACE ELECTRONICS TECH