Signal-to-noise-ratio estimation method

A signal-to-noise ratio estimation and signal-to-noise ratio technology, which is applied in the field of signal-to-noise ratio estimation and can solve problems such as large amount of calculation and deterioration of estimation performance.

Active Publication Date: 2014-07-09
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Problems solved by technology

However, for frequency-selective channels, frequency-domain autocorrelation ignores frequency-selective fading when averaging
Therefore, when the channel has serious deep fading, the...

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[0037] In order to further understand the technical means and characteristics of the present invention, it will be further described in detail with examples in conjunction with the accompanying drawings.

[0038] The signal-to-noise ratio estimation method of the present invention can be applied to OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) system, but not limited to OFDM system, for example, can also be applied to CDMA (Code Division Multiple Access, code division Multiple access), SC-FDMA (Single-carrier Frequency-Division Multiple Access, single-carrier frequency-division multiple access) and other systems.

[0039] The signal-to-noise ratio estimation method of the present invention will be described in detail below by taking OFDM system signal-to-noise ratio estimation as an example.

[0040] The OFDM system includes an OFDM transmitter and an OFDM receiver, and the structure of the OFDM receiver is generally as follows ...

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Abstract

The invention provides a signal-to-noise-ratio estimation method which is used for estimating the signal to noise ratio of a receiving signal according to pilot frequencies inserted into the receiving signal. The signal-to-noise-ratio estimation method includes the following steps: S1, a pilot frequency numerical value Xm, k, a channel estimation value Hm, k and Gaussian white noise Nm, k of the positions where the pilot frequencies are located are obtained from the receiving signal, wherein the m and the k show that the corresponding pilot frequencies are located at the mth data symbol and the kth subcarrier; S2, pilot frequency position information Ym, k of the positions where the corresponding pilot frequencies are located is obtained according to the pilot frequency numerical value Xm, k, the channel estimation value Hm, k and the Gaussian white noise Nm, k; S3, a signal-to-noise-ratio estimation value of the receiving signal is obtained according to the pilot frequency numerical value Xm, k, the channel estimation value Hm, k and the pilot frequency position information Ym, k. By means of the signal-to-noise-ratio estimation method, under the condition that the number of the pilot frequencies inserted into data symbols is limited and a large amount of statistics cannot be carried out, contiguous items between the noise and the signal can be eliminated, the accuracy and the stability of the algorithm estimation value can be optimized, and the computing complexity can be simplified.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a signal-to-noise ratio estimation method. Background technique [0002] In a communication system, the parameters that characterize channel quality mainly include bit error rate, packet error rate, signal-to-noise ratio (signal-to-interference ratio), received signal strength, Doppler frequency shift, and channel delay spread. Among them, bit error rate and packet error rate are direct measures of signal transmission quality, but they need to be obtained through a large number of statistics, which takes a long time and cannot reflect real-time system performance. As an important parameter in the communication system, the Signal to Noise Ratio (SNR) is an important basis for the realization of various communication technologies, including handover in mobile communication, link adaptive technology, decoding algorithm, etc. etc., which are directly related to the bit error ...

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Application Information

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IPC IPC(8): H04L25/02H04B17/00H04B17/345
Inventor 刘烨张帅赵鲁阳王金芳唐逢杰樊蓉
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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