Turbo FEC Architecture for Multi-Rate Differential Modulation

Solution Overview

Problem

Current encoding and decoding devices are not configured to perform efficient multi-rate Forward Error Correction (FEC) encoding and decoding for BPSK, QPSK, and 16QAM data signals, leading to significant power consumption and space requirements due to the need for individual encoder and decoder units for each format.

Innovation Solution

The implementation of enhanced selective multi-rate differential FEC encoding and decoding techniques that enable turbo differential decoding for BPSK, QPSK, and 16QAM signals, using a system with multiple encoder and decoder units that can operate at various data rates and formats, reducing power consumption and complexity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If individual encoder and decoder units are used for each modulation format (BPSK, QPSK, 16QAM), then encoding and decoding can be performed for each format, but power consumption and device space requirements increase significantly

Engineering Contradiction:

Improvesupport for multiple modulation formatsVSAvoidpower consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent implements a universal encoder and decoder architecture that can handle multiple modulation formats (BPSK, QPSK, 16QAM) through a single multi-functional device. The encoder uses a universal generator polynomial and the decoder uses a universal feedback polynomial that work across all formats, eliminating the need for separate dedicated units for each modulation type while maintaining full compatibility and performance.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If individual encoder and decoder units are used for each modulation format, then encoding and decoding can be performed for each format, but device complexity and space requirements increase

Engineering Contradiction:

Improvesupport for multiple modulation formatsVSAvoidnumber of encoder and decoder units

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements a universal encoder and decoder architecture that can handle multiple modulation formats (BPSK, QPSK, 16QAM) through a single multi-functional device. The encoder uses a universal generator polynomial and the decoder uses a universal feedback polynomial that work across all formats, eliminating the need for separate dedicated units for each modulation type while maintaining full compatibility and performance.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent changes the operational parameters (generator polynomial coefficients, feedback polynomial coefficients) of the universal encoder and decoder based on the detected modulation format. The receiver detects which format is being used and configures the universal decoder with the appropriate polynomial coefficients, allowing a single device to adapt to different formats without physical reconfiguration or multiple dedicated units.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If format-specific encoder and decoder units are implemented, then optimal performance for each format can be achieved, but the system becomes less efficient and more costly

Engineering Contradiction:

Improveerror correction performanceVSAvoidmanufacturing cost and complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent implements a universal encoder and decoder architecture that can handle multiple modulation formats (BPSK, QPSK, 16QAM) through a single multi-functional device. The encoder uses a universal generator polynomial and the decoder uses a universal feedback polynomial that work across all formats, eliminating the need for separate dedicated units for each modulation type while maintaining full compatibility and performance.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent changes the operational parameters (generator polynomial coefficients, feedback polynomial coefficients) of the universal encoder and decoder based on the detected modulation format. The receiver detects which format is being used and configures the universal decoder with the appropriate polynomial coefficients, allowing a single device to adapt to different formats without physical reconfiguration or multiple dedicated units.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP3557796B1Rate adaptive turbo forward error correction

Publication Date: 2021.09.01 CISCO TECHNOLOGY INC

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Figure 3A

AI summary

Techniques herein support enhanced multi-rate encoding and decoding of signals in multiple formats. In one embodiment, input data is received at a first device at one of a plurality of data rates. Encoder units are activated to produce streams of encoded input data. The encoder units are configured to operate at the same data rate. Differential encoding operations are performed to produce an encoded output stream. The encoded output stream is modulated for transmission to a second device. In another embodiment, a first device receives an encoded data stream that is transmitted from a second device. The modulated data stream includes encoded data at one of a plurality of data rates. Differential decoding is performed on the encoded data by activating one or more of a plurality of decoder units, where each of the plurality of decoder units is configured to operate at the same rate.