Short wave communication system power automatic control method

Abstract

The invention provides a short wave communication system power automatic control method which includes that 1 a transmitting end transmits two bandwidth chirp signal sequences with opposite adjusting frequencies at intervals and sequentially transmits modulated data frames according to the sequence of the time interval; 2 a receiving end samples and receives the signals according to a time slot, then conducts cross-correlation with local chirp signals, detects the size and the excursion of the relevant peak value and conducts synchronous control and gain adjustment. The good characteristics of accurate self correlation, wide frequency spectrum and good peak uniform rejection ratio of the chirp signals are utilized, the transmitting end selects optimum transmitting power to ensure that the signals can be transmitted to the receiving end and reach a detection threshold, the transmission power is not wasted too much, and power interference on peripheral nodes is reduced. The receiving end estimates the optimum receiving gain quickly according to the two received pioneer chirp signals and can effectively feed the gain back to the transmitting end.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to an automatic power control method of a short-wave communication system applied to the front end of a fishing boat short-wave digital communication network system. Background technique [0002] Marine fishery operations are distributed on the vast sea surface, with the characteristics of large mobility, large number of nodes, poor communication environment, and poor signal of communication rescue equipment, which have caused frequent fishery safety accidents. At present, more and more attention is paid to high-quality remote The reliable short-wave digital communication equipment for fishing boats mainly uses the dedicated 27.5-39.5MHz frequency band for wireless digital communication to build a complex digital communication network for fishing boats. [0003] The front-end signal gain control of the digital communication system is an unavoidable problem in any digital commun...

AI Technical Summary

Problems solved by technology

[0005] In the short-wave communication network system in the prior art, it is difficult for the sending end to choose an optimal sending power, which not only ensures that the signal can be sent to the receiving end to reach the detection threshold, but also ensures that the sending power is not too much wasted and causes power interference to surrounding nodes ; The receiving end cannot quickly estimate the best receiving gain based on the received preamble signal, and at the same time effectively feed back to the sending end

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