A Simplified Demapping Method for Higher Order APSK Modulation
A mapping method and simplified solution technology, applied in the field of simplified demapping for high-order APSK modulation, to achieve the effects of reducing complexity, ensuring demapping performance, and easy hardware implementation
Active Publication Date: 2021-10-15
TIANJIN UNIV
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These methods in the prior art reduce the complexity of understanding mapping on the basis of ensuring the performance of demapping, but in the process of finding the constellation point with the smallest Euclidean distance, additional multiplication operations are still required
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[0041]Certain terms are used, for example, in the description and claims to refer to particular components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. As mentioned throughout the specification and claims, "comprising" is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.
[0042] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "horizontal" etc. are based on th...
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The invention belongs to the technical field of digital communication modulation and demodulation, and in particular relates to a simplified demapping method for high-order APSK modulation, including step 1, a constellation diagram using M-order APSK modulation, which is composed of concentric rings, and the rings The outer radii from the inside to the outside are r l , each ring has constellation points equally spaced, m=m 1 +m 2 , M=2 m ; Step 2, set the M-order APSK constellation diagram as a combination of constellations with different ring radii; Step 3, calculate the magnitude |r| of the received symbol r; Step 4, calculate the sub-vector b a The logarithmic likelihood ratio of each bit; step 5, calculate the sub-vector b p The logarithmic likelihood ratio of each bit; step 6, integrating sub-vector b a and b p The logarithmic likelihood ratio of each bit completes the demapping. Compared with the prior art, the present invention can reduce the number of multiplication, addition and comparison operations required for calculating the logarithmic likelihood ratio, reduces the computational complexity, has less performance loss, and is easier to realize by hardware.
Description
technical field [0001] The invention belongs to the technical field of digital communication modulation and demodulation, and in particular relates to a simplified demapping method for high-order APSK modulation. Background technique [0002] In space satellite applications, with the continuous increase of space utilization, especially high-resolution earth observation and satellite data relay services, the demand for high-bandwidth real-time transmission of data in the space environment continues to increase. In response to this problem, the use of high-order modulation to improve frequency band utilization has gradually become an inevitable requirement for the development of satellite data transmission in the future. [0003] High-order amplitude phase shift keying (APSK) modulation is often used in satellite communications because of its small signal envelope fluctuation, low peak-to-average power ratio, and good robustness in nonlinear channels. The high complexity of d...
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IPC IPC(8): H04L27/18
CPCH04L27/18
Inventor 陈为刚何亚龙彭昱韩昌彩杨晋生
Owner TIANJIN UNIV