Reusable Q-power demapping method and system based on DVB-S2 system
A DVB-S2 and demapping technology, which is applied in the transmission system, modulated carrier system, digital transmission system, etc., can solve the problems of long simulation time of demapping algorithm, high computational complexity, and degradation of bit error performance, etc., to reduce DSP The effect of resource consumption
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Embodiment 1
[0176] 1 QPDemapping Algorithm
[0177] In order to improve the bit error performance of the demapping algorithm and simplify the implementation structure of the algorithm, a Q-th power demapping algorithm is proposed. The algorithm stipulates the values of the exponentiation order Q and the phase rotation angle β of different modulation signals as shown in Table 1. As shown in Figure 7(a), (b), (c) and (d), after different modulation methods are processed by the Q power operation, the constellation diagrams converge to a certain extent, and are converted into QPSK-like modulation constellation diagrams.
[0178] Table 1 Values of exponentiation order Q and phase rotation angle β for different modulation signals
[0179]
[0180] Suppose the 16PSK modulated signal can be expressed as
[0181] r k =(Re k +j*Im k ) (8)
[0182] The signal after the third power operation can be expressed as
[0183] (r k ) 3 =(Re k +j*Im k ) 3 = Re k 3 +j*Im k 3 (9)
[01...
Embodiment 2
[0241] Embodiment 2 of the present invention proposes a reusable Q-power demapping system based on DVB-S2 system. This system includes: QPD algorithm phase offset compensation module, Q-power operation module, power detection module and symbol judgment module ; Wherein, the Q power operation module and the power detection module are reusable modules;
[0242] The QPD algorithm phase offset compensation module is used to perform QPD algorithm phase offset compensation on the signal of the received DVB-S2 system;
[0243] The Q-th power operation module is used to receive the signal of the DVB-S2 system and the modulation mode signal, determine the modulation type of the received signal according to the modulation mode signal, and perform the corresponding Q-th power operation on the received signal after the phase offset compensation of the QPD algorithm , where Q is an integer greater than or equal to 0, and the Q power operation is the Q power operation and the corresponding ...
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