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Method for adaptive modulation and coding, AMC, and AMC controller

An adaptive modulation and coding technology applied in the field of error control coding to minimize power consumption and computational complexity

Active Publication Date: 2017-10-13
MITSUBISHI ELECTRIC CORP
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Problems solved by technology

[0008] The problem of adapting the data rate by changing the modulation order and code rate in conventional Adaptive Modulation and Coding (AMC) networks is addressed by the present invention with parity check matrix (PCM) adjustment for finite iterative decoders and arbitrary modulation formats

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  • Method for adaptive modulation and coding, AMC, and AMC controller
  • Method for adaptive modulation and coding, AMC, and AMC controller
  • Method for adaptive modulation and coding, AMC, and AMC controller

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Embodiment Construction

[0026] figure 1 A network is shown of an adaptive modulation and coding (AMC) controller 150 transmitting digital data from a transmitter 110 to a receiver 130 over a communication channel 120 using principles employed by some embodiments of the invention. The communication channel 120 includes, for example, fiber for optical communication, free space for visible light communication, air for radio communication, water for acoustic communication, coaxial cable for power line communication, and the like.

[0027] At transmitter 110, digital data from source 111 is encoded by an encoder 112 with a forward error correction (FEC) code (eg, such as a low density parity check (LDPC) code) into code words. For such a linear code, digital data s of length N-M is arithmetically multiplied by a generator matrix G 164 of size N*(N-M), which appends parity data p of size M that enables the receiver 130 to correct potential errors. The code rate is defined by R=1-M / N. The code word c is e...

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Abstract

In an advanced adaptive modulation and coding (AMC) scheme, the code rate and the parity-check matrix (PCM) for low-density parity-check (LDPC) codes are adapted according to modulation formats and variable-iteration receivers. The degree distribution for the PCM adaptation is designed by heuristic optimization to minimize the required SNR via an extrinsic information transfer (EXIT) trajectory analysis for finite-iteration decoding. The method uses dynamic window decoding by generating spatially coupled PCM for quasi-cyclic LDPC convolutional coding. The method also provides a way to jointly optimize labeling and decoding complexity for high-order and high-dimensional modulations. The problem to use a large number of different LDPC codes for various modulation formats and variable-iteration decoding is also dealt with by linearly dependent PCM adaptation across iteration count to keep using a common generator matrix. This PCM adaptation can improve a convergence speed of belief propagation decoding and mitigate an error floor issue.

Description

technical field [0001] The present invention relates to error control coding for digital data communication, and more particularly to error control coding for optical communication and radio communication systems. Background technique [0002] Because low-density parity-check (LDPC) codes actually implement close to the theoretical Shannon limit, these codes have been frequently used as error control codes in digital data communications, including radio and optical communications networks. For these communication networks, LDPC encoded data is sent from the transmitter to the receiver over a noisy channel. Using an LDPC code with an appropriate code rate, potential errors due to channel noise can be efficiently corrected by the LDPC decoder at the receiver. To achieve better performance in terms of channel quality, Adaptive Modulation and Coding (AMC) has been used. AMC uses different pairs of modulation order and code rate depending on channel quality. For example, depen...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/00H03M13/03H03M13/11H03M13/21H03M13/25H03M13/35H03M13/13H03M13/15H03M13/19
CPCH03M13/036H03M13/1102H03M13/1111H03M13/1154H03M13/116H03M13/1191H03M13/136H03M13/138H03M13/1505H03M13/19H03M13/21H03M13/251H03M13/255H03M13/353H03M13/616H03M13/6325H03M13/6516H04L1/0003H04L1/0009H04L1/0026H04L1/0035H04L1/1829
Inventor 秋浓俊昭
Owner MITSUBISHI ELECTRIC CORP
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