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Likelihood Generation Device

A generation device and likelihood technology, applied in the direction of digital transmission system, error prevention, multi-carrier system, etc., to achieve the effect of reducing the scale of the circuit

Active Publication Date: 2021-11-05
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this technique described in Patent Document 2, only QAM is supported as a modulation method

Method used

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Embodiment approach 1

[0039] image 3 It is a block diagram showing the configuration of the likelihood generation device according to Embodiment 1 of the present invention. exist image 3 Among them, the likelihood generating device 100 is a device that receives the modulation system selection signal 10 and the received value 11 from outside to calculate the likelihood 12 . Such as image 3 As shown, the likelihood generation device 100 has a similarity detection unit 101 , a likelihood table reference unit 102 and a similarity processing unit 103 .

[0040] In addition, here, the received value 11 is a received symbol set composed of received symbols that map each signal point of the received signal onto a two-dimensional plane (constellation diagram) composed of the I axis and the Q axis. , and each signal point is assigned a value composed of a bit string. Hereinafter, these received symbols are referred to as "information bits".

[0041] In addition, the modulation scheme selection signal...

Embodiment approach 2

[0065] In the first embodiment described above, the likelihood generated by the likelihood table reference unit 102 is calculated by the similarity processing unit 103, but in the second embodiment, the similarity detected by the similarity is calculated by the similarity processing unit The likelihood selection signal generated locally is used for calculation.

[0066] Figure 6 It is a block diagram showing the configuration of likelihood generating device 200 according to Embodiment 2 of the present invention. The likelihood generation device 200 includes a similarity detection unit 201 , a similarity processing unit 202 , and a likelihood table reference unit 203 . Similar to the likelihood generation device 100 of Embodiment 1, the likelihood generation device 200 is a device that receives the modulation system selection signal 10 and the reception value 11 from the outside and calculates the likelihood 12 .

[0067] The similarity detection unit 201 detects the similarit...

Embodiment approach 3

[0076] The likelihood generating devices of Embodiments 1 and 2 described above are composed of dedicated circuits, but in Embodiment 3, an embodiment in which the likelihood generating device is composed of a processor and a memory is shown. Likelihood generation device 300 realizes functions corresponding to the respective functions of likelihood generation device 100 described in Embodiment 1 through program processing. However, the present invention is not limited to this case, and each function of the likelihood generation device 200 described in Embodiment 2 can of course also be realized by the likelihood generation device 300 . Therefore, the description of the case where the likelihood generation device 300 realizes each function of Embodiment 2 is omitted.

[0077] Figure 7 It is a hardware configuration diagram of the likelihood generating device according to the third embodiment. The likelihood generating device 300 includes a processor 301 , a memory 302 , and ...

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Abstract

The likelihood generating device includes: a similarity detection unit (101) that receives a modulation method selection signal (10) and a reception value (11) and detects each of the reception values ​​(11) included in the modulation method selection signal (10). Likelihood similarity between information bits, outputting a likelihood selection signal (13) specifying the likelihood data to be retrieved and an operation selection signal (14) specifying an operation for the likelihood data; the likelihood A table reference unit (102) that registers, as likelihood data, small regions that do not overlap with other small regions in a likelihood distribution representing the likelihood of each information bit, and extracts from the likelihood table Likelihood data of the signal (13); and a similarity processing unit (103) which performs an operation specified by the operation selection signal (14) on the extracted likelihood data, thereby obtaining an overall likelihood distribution .

Description

technical field [0001] The present invention relates to a likelihood generation device. Background technique [0002] In recent years, in order to increase the capacity of optical communication systems and improve frequency utilization efficiency, multi-value modulations such as QPSK (Quadrature Phase-shift Keying), 8QAM (Quadrature Amplitude Modulation), and 16QAM have been adopted. demodulation technology. [0003] For DPSK (Differential Phase-Shift Keying) used in the past, multi-value modulation and demodulation technologies such as QPSK, 8QAM, and 16QAM have short intervals between signal points, so in order to achieve the same transmission distance and signal Speed ​​requires a higher SNR (Signal Noise Ratio). [0004] In order to compensate for this lack of SNR, an error correction decoding method combined with soft-decision decoding is generally used for a strong error correction code such as an LDPC (Low Density Parity Check: Low Density Parity Check) code. In so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/38
CPCH04L27/38H04L1/0016H04L1/0045H04L1/0052H04L1/0054H04L27/0012
Inventor 土肥庆亮
Owner MITSUBISHI ELECTRIC CORP
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