Distributed beam forming method based on 2bit feedback

A beamforming and cooperative node technology, applied in the field of cooperative beamforming based on 2bit feedback, can solve problems such as slow convergence speed, and achieve the effect of improving the convergence speed

Active Publication Date: 2016-08-03
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

Literature [3] studied the disturbance step size, and adjusted the magnitude of the random disturbance amplitude by monitoring the feedback information in real time, especially when th

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  • Distributed beam forming method based on 2bit feedback
  • Distributed beam forming method based on 2bit feedback
  • Distributed beam forming method based on 2bit feedback

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Embodiment Construction

[0024] The method of the present invention based on 2bit feedback cooperative beamforming comprises the following steps:

[0025] Step 1: Model establishment: Suppose there are N+1 nodes in total, among which the number of cooperative nodes is N, and the number of target nodes is 1.

[0026] Step 2: System parameter initialization: let n represent time slot, initial time slot n=n init , and θ i [n]=θ i-init ,δ i [n]=±δ0 , τ i [n]=τ i-init , RSS[n]=RSS i-init ≥0, where n init , θ i-init , τ i-init , RSS i-init are the initial values. θ i [n] is the phase weight of cooperative node i in time slot n; δ i [n] is the disturbance amplitude of cooperative node i in time slot n, and the value of equal probability is ±δ 0 ; τ i [n] is the correction factor of coordinating node i in time slot n; RSS[n] is the received signal strength (ReceivedSignalStrength) of the destination node in time slot n.

[0027] Step 3: Adjust parameter setting: target node sets the maximum rec...

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Abstract

The invention provides a distributed beam forming method based on 2bit feedback. Received signal strength is monitored and disturbance amplitude is selected by using feedback control information fully, thus maximizing the convergence speed of a system. When the RSS (Received Signal Strength) is relatively small, namely when the RSS is far smaller than a demanded value of the system, a disturbance step size is equal to a greater value Lambda1, thus being beneficial for accelerating the convergence speed; when the RSS is increased, namely when the RSS is a little smaller than the demanded value of the system, the disturbance step size is equal to a smaller value Lambda2, thus being beneficial for reducing wrong disturbance times; moreover, when random disturbance is ineffective, a correction factor is updated to the reverse value of random disturbance in a former time slot and is used for correcting a disturbance direction. According to the method, different disturbance step sizes are selected by strengthening monitoring on the RSS; the convergence process is more intelligent; rapid convergence is carried out when the rapid convergence is necessary; the force is enhanced when precise control is necessary; the 2bit feedback algorithm is applicable to various scenes; and the convergence speed of the feedback system is remarkably increased.

Description

technical field [0001] The present invention relates to wireless communication technology, in particular to a cooperative beamforming technology based on 2bit feedback. technical background [0002] Beamforming is the combination of antenna technology and digital signal processing technology for directional signal transmission or reception. At the receiving or sending end of the signal, the desired ideal signal is formed by weighting and combining the signals of the multi-antenna array elements. From the perspective of the antenna pattern pattern, it is equivalent to forming a beam in a specified direction. Adjust the amplitude and phase of the antenna element feedback to form the desired shape of the pattern. [0003] Beamforming is suitable for multi-antenna systems, especially in MIMO systems. Although MIMO technology has been considered as one of the key technologies of the new generation of wireless communication, in most practical wireless communication systems, mul...

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Application Information

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IPC IPC(8): H04B7/06
CPCH04B7/0645H04B7/0663
Inventor 刘冬杨海芬范禹涛
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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