Adaptive encoding modulation method
A technology of adaptive coding and modulation, applied in digital transmission systems, error prevention, multi-carrier systems, etc., can solve the problems of poor Turbo code performance, not considering the relationship between transmission coding rate, coding performance impact, etc., to achieve optimal coding performance effect
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[0043] 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.
[0044] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0045] 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.
[0046] refer to figure 1...
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