Method for comprehensively measuring and calculating carrier to interference plus noise ratio in orthogonal frequency division multiplexing

Abstract

The invention discloses a method for comprehensively measuring and calculating carrier to interference plus noise ratio in orthogonal frequency division multiplexing, which comprises the following steps: measuring reference symbols in a resource block, using the reference symbols to constitute a reference symbol resource unit group and calculating the signal channel response value thereof; calculating signal power which corresponds to the reference symbol resource unit group according to the signal channel response value; measuring total power of the reference symbol resource unit group whichcorresponds to the signal channel reference value and obtaining the corresponding interference plus noise power; and calculating the carrier to interference plus noise ratio according to the ratio ofthe sum of a plurality of signal powers of the reference symbol resource unit group to the sum of a plurality of interference plus noise powers of the reference symbol resource unit group. The methodprocesses the interference plus noise powers of the reference symbol signals received on the adjacent reference symbol resource units, thereby overcoming the shortcoming of inaccurate measurement andcalculation of the carrier to interference plus noise ratio caused by frequency selective fading and signal channel time variation and solving the problem that the measurement and the calculation of the carrier to interference plus noise ratio can not resist the frequency selective fading and the signal channel time variation.

Description

technical field [0001] The invention relates to the technical field of digital transmission, in particular to an improved method for comprehensively measuring and calculating the carrier-to-interference-noise ratio in orthogonal frequency division multiplexing. Background technique [0002] In recent years, Orthogonal Frequency Division Multiplexing (OFDM) technology has been widely used for high-speed data transmission through wired / wireless channels. Orthogonal frequency division multiplexing OFDM technology converts the input serial data into parallel transmission data, and modulates the parallel data onto multiple resource units, that is, sub-channels with orthogonality, and then transmits the modulated data. [0003] This Orthogonal Frequency Division Multiplexing OFDM technology is widely used in the field of digital transmission technology, such as digital / audio broadcasting, digital TV, wireless local area network WLAN, wireless asynchronous transfer mode WATM or br...

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a method for comprehensively measuring and calculating the carrier-to-interference-noise ratio in OFDM, in order to solve the problem of comprehensively measuring and calculating the carrier-to-interference-noise ratio in the LTE (Long Term Evolution, hereinafter referred to as LTE) downlink In the process, the problems of frequency selective fading and channel time variation cannot be dealt with at the same time

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