Method and device for estimating signal-to-noise ratio
A technology of signal-to-noise ratio estimation and channel estimation, which is applied in the field of communication, can solve the problems of not considering the influence of the remaining timing deviation and residual carrier frequency deviation on the received signal, reducing the accuracy of the signal-to-noise ratio estimation result, etc.
Active Publication Date: 2018-12-07
저장진셍일렉트로닉스테크놀러지컴퍼니리미티드
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[0007] The embodiment of the present invention provides a method and device for estimating the signal-to-noise ratio, which is used to solve the problem of not considering the impact of the remaining timing deviation, remaining carrier frequency deviation and sampling frequency deviation on the received signal when estimating the current signal-to-noise ratio, which will reduce the signal-to-noise ratio Problems with the Accuracy of Estimated Results
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[0049] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0050] It should be noted that the signal-to-noise ratio estimation method and device provided by the embodiments of the present invention are based on the OFDM digital transmission technology, and the sending end sends a physical (PHY) frame, which includes information for synchronization and initial channel The estimated periodic training sequence complies with the IEEE 802.11 standard in the field of wireless transmission, the G.hn st...
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The invention discloses a signal to noise ratio estimation method and an apparatus thereof. The method and the apparatus are used to solve a problem of reducing signal to noise ratio estimation result accuracy without considering influences of a residual timing deviation, a residual carrier wave frequency deviation and a sampling frequency deviation. The method comprises the following steps of determining a channel estimation value corresponding to each symbol of an i+Tth data block respectively according to each symbol in an ith data block and i+2Tth data block of a lead code sequence in a frequency domain receiving signal and an original lead code sequence; according to the channel estimation value corresponding to each symbol of the i+Tth data block, and each symbol of the i+Tth data block and the original lead code sequence, determining an estimation value of subcarrier noise power; according to each symbol in the ith data block, the i+Tth data block and the i+2Tth data block, determining an estimation value of signal power corresponding to each symbol of the i+Tth data block; and according to the estimation value of the subcarrier noise power and the estimation value of the signal power corresponding to each symbol of the i+Tth data block, determining a signal to noise ratio of each subcarrier corresponding to the i+Tth data block.
Description
technical field [0001] The present invention relates to the field of communication technologies, in particular to a method and device for estimating a signal-to-noise ratio. Background technique [0002] In a digital communication system using Orthogonal Frequency Division Multiplexing (OFDM) technology, channel fadings corresponding to different subcarriers are different. Certain subcarriers have high channel gain, and some subcarriers may have deep channel fading, which may cause burst errors in the receiver. When the transmission power of the sub-channel corresponding to the sub-carrier is constant, while reaching the target bit error rate (Bit Error Rate, BER), the transmitting end adaptively adjusts each sub-channel by using the channel state information (Channel State Information, CSI). The modulation method can maximize the data transmission rate. [0003] Channel state information is usually estimated by the receiving end and fed back to the transmitting end throug...
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IPC IPC(8): H04L27/26
CPCH04L27/2692H04L27/2695
Inventor 华杰吕炳赟杨银昌
Owner 저장진셍일렉트로닉스테크놀러지컴퍼니리미티드