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.