Method for determining modulation coding mode
A technology of modulation and coding methods and modulation methods, which is applied in the field of determining modulation and coding methods, can solve problems such as the reduction of wireless signal coverage, the reduction of wireless signal coverage, and the impact on system capacity and performance, so as to improve coverage and reduce power amplifiers. Roll back and improve the effect of performance
Active Publication Date: 2008-09-03
HUAWEI TECH CO LTD
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Problems solved by technology
[0004] However, when using AMC technology to determine the modulation and coding method used by the channel, the existing technology only considers how to make the system have higher spectral efficiency
In order to obtain higher spectral efficiency, high-order modulation methods are often used, and high-order modulation methods will cause the peak-to-average ratio (PAPR) of the signal to increase, and PAPR is proportional to the terminal power amplifier fallback, and the PAPR becomes larger It will cause the back-off of the power amplifier to become larger, resulting in a reduction in the coverage of the system's wireless signal
[0005] It can be seen that when determining the modulation and coding method used by the channel, the existing technology only considers the improvement of spectral efficiency, which often leads to a smaller coverage of the system wireless signal, thus greatly affecting the system capacity and performance.
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[0032] Because the prior art only considers improving the spectrum efficiency when determining the modulation and coding mode, but ignores the problem of the power amplifier fallback, so that the coverage of the wireless signal is not expanded to the greatest extent. At present, an effective method to reduce the influence of power amplifier rollback is to use the roll-off factor. Therefore, in combination with the above-mentioned characteristics, the present invention proposes a method for determining the modulation and coding mode, the core idea of which is:
[0033] In the present invention, the process of determining the modulation and coding mode can be performed by the terminal or by the network side.
[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0035] figure 1 It is a fl...
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A method for confirming modulation-coding mode includes calculating out disposable power and spectrum efficiency corresponding separately to modulation-coding mode and to each roll-off factor and setting up corresponding relation of the four, selecting out modulation-coding mode of current maximum spectrum efficiency and current disposable power corresponding to terminal from set-up corresponding relation and applying selected modulation-coding mode as modulation-coding mode used on current communication at terminal.
Description
technical field [0001] The present invention relates to mobile communication technology, in particular to a method for determining modulation and coding modes. Background technique [0002] In a mobile communication system, spectral efficiency refers to the amount of information transmitted per unit bandwidth per unit time on a wireless transmission channel. Therefore, spectral efficiency is an important criterion to measure the performance of wireless communication systems. [0003] Spectrum efficiency = (R c * log 2 M)bps / Hz, where R c Indicates the rate of channel coding, and M indicates the order of the modulation method adopted by the channel. It can be seen that the spectral efficiency depends on the modulation method and coding method adopted by the channel. Therefore, in order to ensure that the system can have higher spectral efficiency, the modulation and coding technology generally used at present is Adaptive Modulation Coding (AMC) technology. When using AM...
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IPC IPC(8): H04Q7/20H04L27/00H04L27/20H04L27/36H04W52/24
Inventor 李化加曲秉玉
Owner HUAWEI TECH CO LTD