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US 2022/0029757 A1Published application
Encoded signal demodulation method, apparatus, device, and computer readable storage medium
AssigneeAmlogic (Shanghai) Co., Ltd.
InventorsChenglin Li, Ben YANG, Xiaotong Liu
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Abstract
The present disclosure relates to an encoded signal demodulation method, apparatus, and device. Some embodiments of the present disclosure are beneficial to improving demodulation performance.
Claims20
An encoded signal demodulation method, comprising:
- obtaining a local ideal signal corresponding to each state at a current moment based on a phase-free information waveform of each state at the current moment and a practical accumulated phase corresponding to each state at the current moment, wherein each state is determined based on a first predetermined number of information bits and each fixed accumulated phase corresponding to a first modulation index, the fixed accumulated phase is obtained based on the first modulation index, the practical accumulated phase of a previous moment and each encoded information bits of the previous moment, the phase-free information waveform at each current moment is obtained based on a second modulation index, a second predetermined number of encoded information bits before the current moment and each encoded information bits of the current moment, the practical accumulated phase of each current moment is obtained based on the second modulation index, the practical accumulated phase of the previous moment and each encoded information bits of the previous moment, the first modulation index is a rational number in a range of modulation indices, the second modulation index is any value in the range of modulation indices, the first predetermined number is equal to a memory depth of encoding rules;
- obtaining a branch metric for each branch path at the current moment based on each local ideal signal and a received signal corresponding to the local ideal signal;
- obtaining each modulation index error correction path metric for the current moment based on the branch metric for each state at the current moment, and at least one of a survivor path metric for a survivor path of the previous moment or a third predetermined number of surviving branch metrics for the survivor path of the previous moment, comparing modulus of each modulation index error correction path metric into the same state, and obtaining the survivor path metric, survivor paths and information bits before encoding for each state at the current moment that satisfies requirements;
- and
- in response to a determination that the received signal is a non-ending signal, jumping to each state of a next moment until a backtracking predetermined requirement is reached, backtracking any of the survivor paths of each state at the current moment, and outputting the information bits before encoding corresponding to a backtracking moment.
2 more elements
An encoded signal demodulation apparatus, comprising:
- a local ideal signal acquisition unit configured to obtain a local ideal signal corresponding to each state at a current moment based on a phase-free information waveform of each state at the current moment and a practical accumulated phase corresponding to each state at the current moment, wherein each state is determined based on a first predetermined number of information bits and each fixed accumulated phase corresponding to a first modulation index, the fixed accumulated phase is obtained based on the first modulation index, the practical accumulated phase of a previous moment and each encoded information bits of the previous moment, the phase-free information waveform at each current moment is obtained based on a second modulation index, a second predetermined number of encoded information bits before the current moment and each encoded information bits of the current moment, the practical accumulated phase of each current moment is obtained based on the second modulation index, the practical accumulated phase of the previous moment and each encoded information bits of the previous moment, the first modulation index is a rational number in a range of modulation indices, the second modulation index is any value in the range of modulation indices, the first predetermined number is equal to a memory depth of encoding rules;
- a branch metric acquisition unit configured to obtain a branch metric for each branch path at the current moment based on each local ideal signal and a received signal corresponding to the local ideal signal;
- an addition comparison selection—survivor path determination—metric recording unit configured to obtain each modulation index error correction path metric for the current moment based on the branch metric for each state at the current moment, and at least one of a survivor path metric for a survivor path of the previous moment or a third predetermined number of surviving branch metrics for the survivor path of the previous moment, compare modulus of each modulation index error correction path metric into the same state, and obtain the survivor path metric, survivor paths and information bits before encoding for each state at the current moment that satisfies requirements;
- and
- a state jumping and backtracking output unit configured to jump to each state of a next moment until a backtracking predetermined requirement is reached in response to a determination that the received signal is a non-ending signal, and backtracking any of the survivor paths of each state at the current moment, and outputting the information bits corresponding to a backtracking moment.
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Dependencies are inferred from the claim text.