Modulation device, demodulation device, modulation/demodulation system, modulation method, demodulation method, modulation program and computer-readable recording medium containing the modulation prog
A technique for modulating transmission and specifying positions, applied to modulation devices, demodulation devices, modulation and demodulation systems, modulation, demodulation, modulation programs, computer-readable recording media on which modulation programs are recorded, demodulation programs and recording In the field of computer-readable recording media for demodulating programs, it is possible to solve problems such as no reduction in data error rate
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Embodiment 1
[0028] figure 1 The figure on the left shows that the data area in the transmission frame is used as a data bit sequence. In the case of 16QAM (Quadrature Amplitude Modulation: 16-value quadrature amplitude modulation), the transmission data transmitted in the data area in the transmission frame is a set of symbols every N bits (N=4). A repeated bit having a value of 1 is mapped to the lower M bits (M=N-2=2) of at least one of the symbols in the transmission data. Here, the duplication bit is an example of a vacancy inserted into the transmission data so that the size of the transmission data matches the size of the data area of the transmission frame.
[0029] The signal configuration of the 16QAM symbol becomes figure 1 As on the right. There are 16 signal points of symbols in the signal layout diagram, and generally in the case of QAM, in the data of 1 symbol (4 bits), in order to minimize the error corresponding to 1 bit, the bit arrangement of adjacent symbols is for...
Embodiment 2
[0069] In Embodiment 1, the method of mapping one symbol in the case of 4-bit 16QAM is described. In this embodiment, as shown in FIG. 2 , a case where one symbol is 6-bit 64QAM will be described.
[0070] Next, the operation of the encoding processing unit 12 in the case of 64QAM transmission will be described. The actions of the encoding processing unit 12 in the case of 64QAM transmission are as follows: Image 6 As shown, the operation of the encoding processing unit 12 is basically the same as in the case of 64QAM transmission.
[0071] Such as Figure 7 As shown, first, reliability information is added at P1, and data division processing is performed for each size of transmission data (information bits) at P2. At P3, encoding processing is performed on the transmission data. RATE-MATCHING processing is performed at P4, and duplicate bits are generated. Here, the extraction processing of the generated overlapping bits is performed (P10). After the transmission data ...
Embodiment 3
[0075] In Embodiment 1 and Embodiment 2, the method of mapping from the last symbol to the number of mappable symbols is shown, but in this embodiment, a multi-level modulation method in which repeated bits are evenly distributed to the entire data will be described.
[0076] Figure 12 It shows the processing configuration of dispersing 16QAM and 64QAM into multiple symbols at the same time and arranging repetition bits.
[0077] In the case of 16QAM, every M1 data symbol is mapped from the top symbol. Here, M is obtained by the following formula.
[0078] M1=(S+(N / 4)) / (N / 2)
[0079] N: the number of repetitions, S: the number of symbols in the entire sent data
[0080] Also similar to the case of 64QAM, mapping processing is performed for each M2 data symbol from the top symbol. M2 was calculated|required by the following formula.
[0081] M2=(S+(N / 6)) / (N / 4)
[0082] N: the number of repetitions, S: the number of symbols in the entire sent data
[0083] In the foregoi...
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