Method and device for measuring channel state information in LTE (Long Term Evolution) system

Abstract

The invention relates to a method and device for measuring channel state information in an LTE (Long Term Evolution) system. The method comprises the following steps of: receiving and averaging channel responses G to obtain an average channel response matrix H; obtaining SINR (Signal-to-Interference Noise Ratio), channel measure Q and CQI (Channel Quality Indicator) corresponding to each PMI/RI (Precoding Matrix Indicator)/(Rank Indication) combination of precoding matrixes and ranks through calculating; obtaining the total efficiency of each PMI/RI combination according to the CQI; obtaining the total measure Qs according to the channel measures Q; and comparing and selecting the PMI/RI combination with maximum total efficiency, and outputting the PMI/RI combination with the maximum total measure when the maximum total efficiency corresponds to more than two PMI/RI combinations. According to the method and device disclosed by the invention, by carrying out error compensation calculation on the SINR, the SINR error is reduced, so that the SINR can reflect the channel state information more accurately, thus the mismeasurement probability is reduced and the working efficiency of the device is improved.

Description

technical field [0001] The invention belongs to the technical field of communications, and in particular relates to a method and device for measuring channel state information in an LTE (Long Term Evolution system, long term evolution system) system. Background technique [0002] The 3GPP LTE project is the evolution of 3G technology and is currently a widely recognized wireless communication technology. [0003] Since the transmission channel of wireless communication is a channel with multipath fading and random time-varying, its channel state information will constantly change, and due to this change, serious error bursts may result in channel quality fluctuations. Therefore, in order to solve the problem of channel quality fluctuation, adaptive coding and modulation technology is adopted in the LTE system. In this technology, the user terminal measures the channel quality of downlink data, calculates channel state information according to the channel quality, and convert...

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Problems solved by technology

[0010] In view of this, the purpose of the present invention is to provide a method and device for measuring channel state information in a long-term evolution LTE system to solve the problem that there is an error in the channel estimation value in the prior art, and the average signal-to-dryness ratio obtained from the channel estimation value cannot be accurate. The problem of reflecting the channel state, resulting in a decrease in measurement accuracy

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