Communication system, receiver, transmitter and communication method
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorWataru Matsumoto
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Abstract
A communication system according to the present invention comprises a transmitter for performing low-density parity-check (LDPC) coding and a receiver for performing LDPC decoding based on the “Sum-Product algorithm”, and performing a synchronous control and a user detection by using a sum of absolute values of logarithm likelihood ratio of the posterior probability of each bit that is output as a decoding result.
Claims24
A communication system comprising:
- a transmitter that performs low-density parity-check encoding;
- and
- a receiver that decodes low-density parity-check reception data of a code word length sampled from a predetermined sampling start point based on a “Sum-Product Algorithm” and executes a synchronous control to estimate said predetermined sampling point as a point of a symbol synchronization using a sum of absolute values of logarithmic likelihood ratios of posterior probabilities of individual bits output as a result of a decoding, detects a sampling start point at which the sum of absolute values of logarithmic likelihood ratios becomes maximum, and sets the sampling start point as a point of a symbol synchronization.
A receiver that communicates with a transmitter that performs low-density parity-check encoding, wherein the receiver decodes low-density parity-check reception data of a code word length sampled from a predetermined sampling start point based on a “Sum-Product Algorithm” and executes a synchronous control to estimate said predetermined sampling point as a point of a symbol synchronization using a sum of absolute values of logarithmic likelihood ratios of posterior probabilities of individual bits output as a result of a decoding, detects a sampling start point at which the sum of absolute values of logarithmic likelihood ratios becomes maximum, and sets the sampling start point as a point of a symbol synchronization.
A communication method comprising:
- low-density parity-check encoding of transmission data at a transmitter;
- low-density parity-check decoding of reception data of a code word length sampled from a predetermined sampling start point based on a “Sum-Product Algorithm”;
- executing a synchronous control to estimate said predetermined sampling point as a point of a symbol synchronization using a sum of absolute values of logarithmic likelihood ratios of posterior probabilities of individual bits output as a result of a the decoding;
- detecting a sampling start point at which the sum of absolute values of logarithmic likelihood ratios becomes maximum;
- and
- setting the sampling start point as a point of a symbol synchronization.
Dependencies are inferred from the claim text.