Self-adaptive code modulating method

A technology of adaptive coding and modulation method, applied in the direction of digital transmission system, error prevention, electrical components, etc., can solve the problem of inability to erroneous frame immunity, inability to determine the size of the threshold adjustment value, etc., to achieve the effect of reducing sensitivity

Inactive Publication Date: 2006-06-21
ZTE CORP
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Problems solved by technology

[0022] The technical problem to be solved by the present invention is: the prior art cannot determine the size of the threshold adjustment value by the change of the channel, and cannot be immune to normal error frames

Method used

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  • Self-adaptive code modulating method
  • Self-adaptive code modulating method
  • Self-adaptive code modulating method

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Embodiment Construction

[0044] Below in conjunction with accompanying drawing, the embodiment of technical scheme is described in further detail:

[0045] This embodiment is aimed at the adaptive coding and modulation system adopted in the HSDPA downlink transmitting and receiving system.

[0046] The HSDPA system sends data packets with different modulation and coding methods according to the time relationship of one subframe every 2 ms. The modulation and coding methods of the data packets can be defined as the 5-level MCS in the background technology, and other combinations are also possible. The UE judges the basic quality of the channel environment by measuring the SINR of the CPICH, adjusts the upper and lower changes of the MCS threshold by judging whether the subframe CRC is correct, and measures the change of the Doppler frequency offset (known technology) and the number of multipaths. Adjust the specific variation of the MCS threshold. Through the above process, the UE will provide the Nod...

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Abstract

The modulation method for self-adaptive code comprises: determining initial MCS threshold by simulation tested SINR and MCS throughput on single-path quasi-stationary condition; detecting continuously the real-time SINR value; when SINR within prescribed range, detecting the CRC check result, if right, then defining new threshold of MCS equals to the old minus D; or else, defining new threshold of MCS equals to the old plus U; returning to detect real-time SINR value. This invention reduces the sensitivity to SINR as well as to FER variation, and obtains immunity function to common error frame and throughput gain.

Description

technical field [0001] The invention belongs to an adaptive coding and modulation method in a mobile communication system, in particular to a threshold adjustment method for adaptive coding and modulation. Background technique [0002] The principle of the adaptive modulation and coding (Adaptive Modulate Coding: AMC) technology is to change the mode of modulation and code rate in real time according to the change of channel conditions. In a system using AMC technology, such as a High Speed ​​Downlink Packet Access (HSDPA) system, a mobile phone user in a favorable position, such as a mobile phone user close to a base station, can use high-order modulation for its corresponding downlink and high code rate (such as 16QAM, larger data block size, higher error correction code rate), and mobile phone users in unfavorable positions, such as mobile phone users far away from the base station, the corresponding downlink modulation order and The code rate is smaller (for example, QP...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
Inventor 张峻峰魏宁孙毅
Owner ZTE CORP
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