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AMC (Adaptive Modulation and Coding) method based on SC-FDE (Single Carrier-Frequency Domain Equalization) system

A technology of SC-FDE, baseband system, applied in baseband system components, transmission systems, multi-frequency code systems, etc., can solve the problems of low spectral efficiency and increased channel overhead.

Inactive Publication Date: 2013-03-06
HARBIN INST OF TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of increased channel overhead and low spectral efficiency due to channel state changes in the SC-FDE system under the condition of multipath time-varying channels. , this system proposes an AMC method based on SC-FDE system

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  • AMC (Adaptive Modulation and Coding) method based on SC-FDE (Single Carrier-Frequency Domain Equalization) system
  • AMC (Adaptive Modulation and Coding) method based on SC-FDE (Single Carrier-Frequency Domain Equalization) system
  • AMC (Adaptive Modulation and Coding) method based on SC-FDE (Single Carrier-Frequency Domain Equalization) system

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specific Embodiment approach 1

[0042] Embodiment 1. The specific operation steps of the AMC method based on the SC-FDE system described in this embodiment are as follows:

[0043] Step 1, classify the current channel according to the channel classification method adopted by the SC-FDE adaptive baseband system channel classification module, and obtain the current channel state information by the channel type;

[0044] Step 2, obtain the signal-to-noise ratio SNR information of the current receiver according to the SC-FDE adaptive baseband system signal-to-noise ratio SNR estimation module;

[0045] Step 3, according to the current channel state information obtained in step 1 and the signal-to-noise ratio SNR information of the current receiver obtained in step 2, select the optimal transmission strategy matching the current channel state in the transmission strategy switching table;

[0046] Step 4, delivering the selected optimal transmission strategy to the receiver and the transmitter simultaneously throu...

specific Embodiment approach 2

[0049] Embodiment 2. This embodiment is a further limitation of the AMC method based on the SC-FDE system described in Embodiment 1. The optimal transmission strategy switching table is obtained by the following method:

[0050] Under the off-line state of described SC-FDE self-adaptive baseband system, carry out system simulation to given channel state, obtain the performance curve diagram of bit error rate and signal-to-noise ratio relation, according to target bit error rate P e The restriction of dividing the signal-to-noise ratio fading region [γ i ,γ i+1 ), and determine the switching threshold signal-to-noise ratio of the transmission strategy γ i ;

[0051] Search for all the target bit error rate P in the SNR fading areae The required optimal transmission strategy corresponding to the SNR fading area, the target bit error rate P e The required optimal transmission strategy forms an optimal transmission strategy set, and an optimal transmission strategy switching ta...

specific Embodiment approach 3

[0052] Specific Embodiment 3. This embodiment is a further limitation of the AMC method based on the SC-FDE system described in Specific Embodiment 2. The signal-to-noise ratio fading region [γ i ,γ i+1 ) is determined by the following method: with the target bit error rate P e Make a straight line parallel to the horizontal axis in the performance curve diagram of the relationship between bit error rate and signal-to-noise ratio, and obtain intersection points with the BER-SNR curve of each strategy respectively, and the corresponding abscissa of the obtained intersection points is is the switching threshold of the transmission strategy γ i , the SNR range between every two thresholds is the SNR fading region [γ i ,γ i+1 ).

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Abstract

The invention provides an AMC (Adaptive Modulation and Coding) method based on an SC-FDE (Single Carrier-Frequency Domain Equalization) system, relates to an AMC modulation and encoding method, and belongs to the field of wireless radio. In order to solve the problems that the a channel cost is increased and the spectrum efficiency is low under the condition that the SC-FDE system is at a time-varying multi-path channel, caused by that a channel needs to be subjected to estimation and policy exchange at any time when current information is transmitted, the invention provides the adaptive modulation and coding method by combining an AMC technology and self characteristics of an SC-FDE system theory; policy lasting time is introduced to restrict the utilization time of the policy and the switching frequency of the policy, so that the optimal policy which is matched with the current channel state is searched in a policy switching table; only if the average lasting time of the selected optimal policy is exceeded, the method can carry out the next time of the selection and the switching of the optimal transmission policy, so that the channel estimation and policy switching processing efficiencies are reasonably reduced, the spectrum efficiency is effectively improved and the system throughput is maximized. The AMC method based on the SC-FDE system is applicable to the field of a wireless radio communication technology.

Description

technical field [0001] The invention relates to the radio field, in particular to a novel adaptive modulation and encoding method. Background technique [0002] The scarcity of available spectrum for wireless communications and the rapid growth of diverse service demands generated by wireless portable devices urgently require transmission technologies that support high-speed information transmission and high spectral efficiency. However, the traditional non-adaptive transmission system is designed according to the worst state of the channel, and requires a fixed link margin to maintain acceptable transmission performance, so the channel capacity of the system cannot be fully utilized. The basic idea of ​​adaptive modulation and coding (AMC) technology is to disperse and balance communication in real time through adaptive adjustment of parameters such as symbol transmission rate, modulation scheme, modulation constellation size, coding scheme, and coding efficiency. load. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L25/02H04L27/26
Inventor 谭学治于洋迟永钢马琳叶亮贾敏李秀华
Owner HARBIN INST OF TECH
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