US 10,833,792 B2 · Overlapped multiplexing-based modulation and demodulation method and device

Abstract

An overlapped multiplexing-based modulation and demodulation method and device are disclosed. In the modulation method, a precoding structure is used, and a transmit end first performs parity check product code-based coding on an input information sequence, generates a factor graph for a coding result and according to a coding rule, then performs overlapped multiplexing-based modulation and coding, and transmits a coded signal by using an antenna. In the demodulation method, a signal is transmitted by using a channel, and after receiving the signal by using an antenna, a receive end first performs digital signal processing, including processes such as synchronization and equalization, then performs overlapped multiplexing-based demodulation and decoding, and finally performs factor graph-based belief propagation decoding on a decoding result, to finally obtain a decoded sequence. In this application, a product code-based decoding method is used, a parity check code is used as a subcode, and a belief propagation idea of the factor graph is applied to a decoder end. Therefore, a parity check product code in a simple structure is used. In addition, in the method, the factor graph is used in a decoding process, thereby reducing operation complexity.

Claims7

Dependent claims

An overlapped multiplexing-based modulation method, comprising:

obtaining input information;
performing parity check product code-based coding on the input information, to generate a factor graph;
performing overlapped multiplexing-based modulation and coding;
and
transmitting a coded signal;
wherein the performing parity check product code-based coding on the input information comprises:
filling the input information into information bits in a coding structure;
performing row coding on the information in the information bits;
performing column coding on the information in the information bits;
and
generating the factor graph for a coding result according to a coding rule;
wherein the performing parity check product code-based coding on the input information further comprises:
writing an input information sequent into corresponding information bits according to a kc×kr two-dimensional structure, wherein a length of the input information is N=kc×kr, wherein kr represents a quantity of rows, and kc represents a quantity of columns;
performing row coding by assuming that information in the (kr+1)th bit of each row is a modulo-2 addition result of the first kcth columns of the current row;
performing column coding by assuming that information in the (kc+1)th bit of each column is a modulo-2 addition result of the first krth rows of the current column;
and
generating the factor graph for the coding result according to the coding rule.

14 more elements

An overlapped multiplexing-based demodulation method, comprising:

obtaining an input signal;
performing overlapped multiplexing-based demodulation and decoding on the input signal;
performing factor graph-based belief propagation decoding;
and
outputting a decoding result;
wherein the performing factor graph-based belief propagation decoding comprises:
calculating an initial log-likelihood ratio;
setting a maximum quantity of iterations;
calculating a check node and updating check information;
calculating a variable node and updating an information message;
calculating a log-likelihood ratio when all check nodes related to information bits provide information;
performing decision;
and
outputting the decoding result after a specific preset condition is satisfied.

11 more elements

An overlapped multiplexing-based modulation device, which comprises a hardware processor and a memory, and the hardware processor is configure to executed programming modules stored in the memory, and the programming modules comprising:

an input information obtaining module, configured to obtain input information;
a parity check product code-based coding module, configured to perform parity check product code-based coding on the input information;
an overlapped multiplexing-based modulation and coding module, configured to perform overlapped multiplexing-based modulation and coding;
and
a signal transmission module, configured to transmit a coded signal;
the parity check product code-based coding module is further configured to:
write an input information sequent into corresponding information bits according to a kc×kr two-dimensional structure, wherein a length of the input information is N=kc×kr, wherein kr represents a quantity of rows, and kc represents a quantity of columns;
perform row coding by assuming that information in the (kr+1)th bit of each row is a modulo-2 addition result of the first kcth columns of the current row;
perform column coding by assuming that information in the (kc+1)th bit of each column is a modulo-2 addition result of the first krth rows of the current column;
and
generate the factor graph for the coding result according to the coding rule.

8 more elements

Dependencies are inferred from the claim text.

Overlapped multiplexing-based modulation and demodulation method and device

Life of this patent

Overlapped multiplexing-based modulation and demodulation method and device

Life of this patent

Abstract

Claims7