Method and device of power control

Abstract

The invention discloses a method and a device of power control, and relates to the technical field of wireless communication. The method and the device of power control are used for improving power control performance. The standard deviation value of strength of received signals is confirmed according to the signal strength value of the received signals, the standard deviation value is the statistical average value of the difference value of the strength of the received signals and the average value of the strength of the received value, compensation is carried out on signal sending power according to the standard deviation value, therefore compensation is carried out on shadow fading in open loop power control, the defect that closed loop power control cannot track shadow fading of an information channel in time when propagation time delay is large is overcome, and accordingly power control performance is improved.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a power control method and device. Background technique [0002] Power control is a basic concept in cellular mobile communications, and its main purpose is to maintain link quality and reduce device transmission power. Power control is more important for the interference-limited Code Division Multiple Access (CDMA) system. The CDMA system must keep the transmission power of each mobile station at the lowest level that meets the communication requirements as much as possible. And it can ensure that no matter how far they are from the base station and how the channel changes at the moment, they can get the same received power at the receiving end. When the signal of each mobile station reaches the base station, it can reach the minimum signal-to-noise ratio required to ensure communication quality. , the capacity of the CDMA system will reach the maximum. [0003] I...

AI Technical Summary

Problems solved by technology

From the above description, it can be seen that the speed of open-loop power control is relatively slow, and the speed of closed-loop power control is relatively fast. The traditional open-loop power control mainly compensates the influence of large-scale channel fading. Due to the combined use of closed-loop power control, The traditional open-loop power control has a large dynamic range and lower power control requirements

[0004] The existing power control combines a variety of power control methods, thus reducing the requirements for open-loop power control, but for communication systems with large propagation delays (such as GEO satellite mobile communication systems), if the low-demand open-loop Power control combines closed-loop power control and outer-loop power control. Due to the influence of propagation delay, closed-loop power control cannot track channel changes in time. The decline in closed-loop power control performance means the decline in power control performance of the entire system. In this case, the method of open-loop power control needs to be optimized to compensate for the influence of propagation delay on power control performance

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