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32 amplitude phase shift keying (APSK) modulation method and 32 APSK demodulation soft information calculating method

A calculation method and soft information technology, applied in the direction of multi-carrier systems, etc., can solve problems such as complex calculation, reduced complexity of calculation soft information, and large amount of calculation

Active Publication Date: 2013-06-19
TSINGHUA UNIV
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Problems solved by technology

[0014] The purpose of the present invention is to overcome the difficult problem that existing 32APSK demodulation soft information computing technology is complex in operation, large in calculation amount, not suitable for hardware to realize high-speed digital transmission, proposes a kind of novel 32APSK modulation and its demodulation soft information computing method, obtains The soft information calculation expression only includes simple judgment, addition and subtraction, constant and variable multiplication operations, which greatly reduces the complexity of calculating soft information, which is conducive to the demodulator hardware to achieve high-speed data transmission

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  • 32 amplitude phase shift keying (APSK) modulation method and 32 APSK demodulation soft information calculating method
  • 32 amplitude phase shift keying (APSK) modulation method and 32 APSK demodulation soft information calculating method
  • 32 amplitude phase shift keying (APSK) modulation method and 32 APSK demodulation soft information calculating method

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Embodiment Construction

[0042] A kind of 32APSK modulation and demodulation soft information calculation method thereof that the present invention proposes is characterized in that, comprises the following steps:

[0043] 1) The 5-bit b input to the modulator 4 b 3 b 2 b 1 b 0 According to the mapping relationship in Table 2, it is mapped to (I+jQ) baseband complex signal, where R 1 , ρ 1 R 1 , ρ 2 R 1 are the radii of the inner ring, middle ring and outer ring of 32APSK constellation points respectively, ρ 1 , ρ 2 are the ratios of the radii of the middle, outer and inner rings respectively, and the serial numbers in the table show 32 different mapping relationships.

[0044] Table 2 Modulator input and output mapping relationship

[0045]

[0046]

[0047]

[0048] Let i = 1, 2, 3 represent the inner ring, middle ring and outer ring respectively, and take energy normalization as the constraint condition, and limit where n i is the number of constellation points on the i-th ring...

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Abstract

The invention relates to a 32 amplitude phase shift keying (APSK) modulation method and a 32 APSK demodulation soft information calculating method and belongs to the technical field of high-order modulation and demodulation in a wireless digital transmission system. The 32 APSK modulation method includes mapping 5-bit information input by a modulator to an (I+jQ) base band complex signal through a mapping relationship for post-stage transmission. As to the 32 APSK modulation method, the provided low-complexity demodulation soft information calculating method can calculate soft information corresponding to the 5-bit b4 b3 b2 b1 b0 in received signs for rear-end coding. By means of the demodulation soft information calculating method, calculation complexity of the soft information can be obviously reduced, realizability of high-speed digital hardware is improved, and the simplified calculating method does not cause obvious loss to channel capacity and error code performances.

Description

technical field [0001] The invention belongs to the technical field of high-order modulation and demodulation in wireless digital transmission systems, and particularly relates to 32APSK modulation and calculation of different bit soft information in the corresponding demodulation process. Background technique [0002] At present, due to the high spectral efficiency of the high-order amplitude phase-shift keying (APSK) technology, it can save bandwidth resources, and compared with the quadrature amplitude modulation (QAM) technology, it has lower requirements on the linearity of the back-end amplifier. It has broad application prospects in constrained systems. In Europe's second-generation satellite digital broadcasting (DVB-S2) standard and the Space Data System Consultative Committee (CCSDS) standard "Variable Advanced Coding and Modulation Methods in High-speed Telemetry Applications" (CCSDS 131.2-R-1), both A 32APSK modulation scheme is included. [0003] The second-ge...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/36H04L27/38
Inventor 殷柳国张浩陆建华
Owner TSINGHUA UNIV
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