Method, device and system for determining and adjusting modulation format and carrier power

Abstract

A modulation format and carrier power determining method, a modulation format and carrier power adjusting method, a device, and a system are provided. A per-unit-power signal-to-noise ratio of each subcarrier of at least two subcarriers is determined by using a modulated signal; a bit error rate of each subcarrier of the at least two subcarriers is determined according to the signal-to-noise ratio and a preset correspondence between signal-to-noise ratios and bit error rates, to obtain subcarrier bit error rates; a modulation format in which a to-be-modulated signal is modulated onto each subcarrier of the at least two subcarriers is determined according to the subcarrier bit error rates; a system bit error rate of a multi-carrier communications system is determined according to the subcarrier bit error rates; and a carrier power of each subcarrier of the at least two subcarriers is determined according to the system bit error rate. By using the foregoing method, the device, and the system, actual performance of a multi-carrier communications system can be reflected in a relatively accurate way.

Description

technical field [0001] The present invention relates to the technical field of digital communication, in particular to a method, device and system for determining and adjusting modulation format and carrier power. Background technique [0002] In communication systems, especially optical communication systems, the system channel is no longer flat due to the influence of various electrical and optical devices, filters and other damages. The most common characteristic is good performance at low frequencies and progressive degradation as frequency increases. In order to more fully utilize the spectrum resources of the system, a multi-carrier technology is proposed. Multi-carrier technology divides the frequency band of the multi-carrier communication system into at least two sub-bands, and approximates each sub-band as an independent narrow-band system. There are at least two subcarriers, so that the utilization rate of each subcarrier is greatly improved. Common multi-carri...

AI Technical Summary

Problems solved by technology

[0006] The above two water injection processes are based on theoretical derivation and calculation, and the modulation format and carrier power are adjusted. However, in fact, the performance that the multi-carrier communication system can achieve is related to the noise distribution and the coding adopted by the sub-carriers. Therefore, the current Some water injection methods cannot accurately reflect the actual performance of multi-carrier communication systems

Images