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Signal-to-noise radio estimation method based on response feedback control signaling

A technology for signal-to-noise ratio estimation and feedback control, applied in wireless communication, error prevention/detection using the return channel, network traffic/resource management, etc. Issues such as signaling overhead at the sending and receiving end, to achieve high transmission efficiency, small estimation error, and large data throughput

Inactive Publication Date: 2015-06-24
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, the disadvantage of the blind SNR estimation method is that the estimation accuracy is often not as good as the SNR estimation method based on the training sequence.
No matter which SNR estimation method is used, the receiver needs to feed back the SNR estimation result to the transmitter through the feedback channel. The feedback process will not only increase the signaling overhead of the transceiver, but also be affected by quantization errors, feedback channel errors, and feedback delays. , so that the SNR estimation results obtained by the transmitter from the feedback of the receiver are often not completely accurate and real-time, and thus seriously affect the performance of the adaptive system

Method used

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  • Signal-to-noise radio estimation method based on response feedback control signaling
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  • Signal-to-noise radio estimation method based on response feedback control signaling

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Embodiment

[0031] A specific embodiment of the present invention is a method for estimating signal-to-noise ratio based on response feedback control signaling, the steps of which are as follows:

[0032] A. Calculation of the average number of transmissions

[0033] In the hybrid automatic repeat request packet data transmission system, for the latest W=10 to 20 sent packet data, the positive response feedback signaling ACK or negative response feedback signal from the corresponding received hybrid automatic repeat request system In NAK, according to the ratio of the sum of all NAK times and ACK times of W transmitted packets to the number W of packet data, the average transmission times T of each packet data in W transmitted packet data is obtained r ;

[0034] B. Signal-to-noise ratio estimation

[0035] B1. Estimation of the initial value of the signal-to-noise ratio

[0036] The average number of transmissions T determined according to step A r , the estimated initial value SNR o...

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Abstract

A signal-to-noise radio estimation method based on response feedback control signaling comprises the following steps: A, calculating the average number of transmissions; B, estimating the signal-to-noise radio; C, outputting the result of signal-to-noise radio estimation. For the information like the maximum number of transmissions set by a data frame to be transmitted, accurate SNR estimation result is calculated from ACK-NAK response control information fed back by a receiving terminal by means of parameters such as coding rate and code length of a transmitting terminal in a hybrid automatic repeat request HARQ system; the method is applicable to a grouped data communication system of the hybrid automatic repeat request HARQ system; the signal-to-noise radio estimation of the method is accurate; moreover, without increasing the complicatedness of the realization of the currently applied grouped data communication system of the HARQ system and affecting the grouped data transmission efficiency, the method can effectively meet the requirements of self-adapting transmission technology on SNR estimation.

Description

technical field [0001] The invention relates to a signal-to-noise ratio estimation method based on response feedback control signaling in a wireless packet data communication system applying Hybrid Automatic Repeat reQuest (HARQ, Hybrid Automatic Repeat reQuest). Background technique [0002] Bandwidth is a very precious resource in communication systems. In recent years, people's requirements for the transmission rate of wireless communication systems have expanded rapidly, but the spectrum resources available for mobile communication are very limited. How to make full use of the spectrum resources of mobile communication and meet the needs of users as much as possible is a research hotspot in wireless communication technology. Link adaptive transmission technology adaptively changes the transmission parameters according to channel changes, fully utilizes the time, frequency and space resources in the communication system, and is an important means to improve spectrum util...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/18H04L1/16H04W28/04
Inventor 陈庆春杨睛蔡曦范平志
Owner SOUTHWEST JIAOTONG UNIV
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