Multi-Mode Channel Coding with Embedded FEC Mode Indication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing channel coding systems for audio data face challenges in efficiently signaling forward error correction (FEC) modes, particularly in wireless networks like DECT, where signal strength varies, leading to suboptimal performance due to fixed FEC schemes and exposure of mode signaling to transmission errors.
Innovation Solution
A multi-mode redundancy encoding system with a colorator that applies a coloration sequence to code words, embedding FEC mode information, allowing the channel decoder to determine the decoding mode without separate signaling, thus improving data transmission efficiency and resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If explicit mode signaling is used to indicate FEC coding modes, then the channel decoder can determine the decoding mode, but the data rate is reduced due to additional signaling bits
Solution Approach 1:
The patent merges the FEC mode indication with the audio data frames by embedding mode-specific patterns directly into the coded bits. Instead of separate signaling, the mode information is combined with the data transmission through coloration sequences that modify the coded bits according to the selected FEC mode, eliminating dedicated signaling bits while preserving mode information.
Solution Approach 2:
The patent makes the audio data frames serve multiple functions: they carry both the audio information and the FEC mode indication simultaneously. The colored code words perform dual roles as both data carriers and mode signifiers, allowing the same transmission medium to convey multiple types of information without requiring additional dedicated channels.
2Reliability
If explicit mode signaling is transmitted separately, then the FEC mode can be indicated clearly, but the signaling itself is exposed to transmission errors without error protection
Solution Approach 1:
The patent combines the mode indication with the error-protected audio data transmission. By embedding the mode information within the same error-corrected code structure, the mode indication inherits the error protection capabilities of the FEC scheme, eliminating the vulnerability of separate unprotected signaling channels.
Solution Approach 2:
The patent uses coloration sequences as intermediaries to embed mode information within the coded bits. These sequences act as a mediator that carries mode information while being protected by the underlying error correction code, preventing direct exposure of mode signaling to transmission errors.
3Device complexity
If a fixed FEC scheme is applied throughout a connection, then the system is simple to implement, but performance is suboptimal when signal strength varies
Solution Approach 1:
The patent implements dynamic FEC mode selection that adapts to varying channel conditions. The system can switch between different FEC modes (e.g., different redundancy rates or code strengths) based on the current signal quality, allowing optimal error protection to be applied at each moment while maintaining a relatively simple underlying FEC framework.
Solution Approach 2:
The patent changes FEC parameters such as redundancy rate or code strength according to channel conditions. By adjusting these parameters dynamically, the system optimizes the balance between data rate and error protection based on signal strength variations without requiring a complete redesign of the FEC architecture.
4Reliability
If higher redundancy is added to increase error correction capability, then more transmission errors can be corrected, but the data rate decreases
Solution Approach 1:
The patent implements dynamic redundancy adjustment where the amount of redundancy added to the audio data varies based on channel conditions. During periods of good signal quality, less redundancy is added to maximize data rate, while during poor conditions, more redundancy is added to ensure reliable transmission, optimizing the trade-off in real-time.
Solution Approach 2:
The patent changes the redundancy parameter of the FEC scheme according to transmission conditions. By adjusting the redundancy rate or code parameters dynamically, the system adapts the error correction capability to match the actual channel quality, preventing unnecessary data rate reduction when high error protection is not needed.
Data Source
AI summary
A channel encoder for encoding a frame includes a multi-mode redundancy encoder for redundancy encoding the frame in accordance with a certain coding mode from a set of different coding modes, wherein the coding modes are different from each other with respect to an amount of redundancy added to the frame, wherein the multi-mode redundancy encoder is configured to output a coded frame including at least one code word; and a colorator for applying a coloration sequence to the at least one code word; wherein the coloration sequence is such that at least one bit of the code word is changed by the application of the at least one of coloration sequence, wherein the specific coloration sequence is selected in accordance with the certain coding mode.