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Adaptive encoding modulation method

An adaptive encoding and modulation technology, applied in digital transmission systems, error prevention, multi-carrier systems, etc., can solve problems such as poor performance of Turbo codes, impact on encoding performance, and failure to consider the relationship between transmission encoding rates, etc., to achieve optimal encoding performance effect

Active Publication Date: 2009-03-18
ZTE CORP
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Problems solved by technology

[0009] However, the existing AMC only corresponds the CQI value to the modulation order, without considering the relationship with the transmission coding rate
This makes encoding performance suffer
For example, when the encoding method used is Turbo code and the Circular Buffer Rate Matching (CBRM) algorithm is adopted, for the high-order modulation method of 64QAM (Quadrature Amplitude Modulation), when the code rate is less than 0.6, it is found that the Turbo code poor performance

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Embodiment Construction

[0044] The idea of ​​the present invention is that in the process of adaptive coding and modulation, when the modulation mode is selected according to the value of CQI, the transmission code rate is selected accordingly, and when the high-order modulation mode is adopted, a higher coding code rate is used correspondingly.

[0045] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0046] First define a CQI value range CQI∈{0, 1, 2, ... N} and given positive integers P, Q, satisfying 0<P<Q<N, where the values ​​of P, Q, N can be adopted The value given in the protocol. The corresponding relationship between the CQI value, the modulation mode, and the transmission code rate is configured in the base station. In this embodiment, there are three modulation modes: QPSK, 16QAM, and 64QAM, and Turbo code is used for encoding. The corresponding relationship is described in detail below.

[0047] refer to figure 1...

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Abstract

The invention relates to a self-adapting pulse code modulation method, which comprises the following steps: firstly, locally allocating the corresponding relationship between the indicated value, the modulation mode and the transmission code rate of the communication channel quality by a base station, secondly, transmitting down-bound data to a mobile terminal according the locally allocated corresponding relationship to select the corresponding modulation method and the transmission code rate after the base station receives the indicated value of the communication channel quality of the current time of the communication channel, namely the indicated value is transmitted by the mobile terminal. The self-adapting pulse code modulation method of the invention correspondingly selects the appropriate transmission code rate when selecting the appropriate modulation mode through the CQI, thereby the throughput of the system can reach the maximum value and the coding performance can be better.

Description

technical field [0001] The invention relates to the field of digital communication systems, in particular to a method for adaptive coding and modulation. Background technique [0002] In the mobile communication system, the basic principle of AMC (Adaptive Modulation and Coding, Adaptive Coding and Modulation) is to select the appropriate modulation and coding method MCS (Modulation and Coding Set) according to the change of the wireless channel. The current resource selects the most suitable downlink modulation and coding method. In the AMC system, general users use higher-order modulation and higher coding rates under ideal channel conditions, and lower-order modulation and coding methods under less ideal channel conditions. [0003] 3GPP (3rd Generation Partnership Project, 3rd Generation Partnership Project) HSDPA (High Speed ​​Downlink Packages Access, high-speed downlink packet access technology) / LTE (LongTerm Evolution, long-term evolution) and other systems use adap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L27/34
Inventor 谢大雄许进徐俊胡留军
Owner ZTE CORP
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