Superposition Coding Transmission Device Parallel Decoding
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Solution Overview
Problem
The multiplexing scheme utilizing superposition coding faces inefficiencies due to processing delays and increased resource requirements, particularly in sequential decoding, and suffers from decreased transmission capacity due to interference between superposed data series.
Innovation Solution
A transmission device that multiplexes data series using a first and second mapper to generate modulated symbol streams, which are then superposed at a predetermined amplitude ratio, allowing for efficient processing and transmission, and includes a converter to adjust the second modulated symbol stream based on the first modulated symbol stream for improved decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sequential decoding is used in superposition coding, then decoding accuracy is improved, but processing delay increases
Solution Approach 1:
The patent segments the decoding process into multiple parallel decoding units, each handling different data series simultaneously. This allows the system to maintain sequential decoding accuracy for each individual data series while reducing overall processing delay through parallel execution of multiple decoding operations.
2Productivity
If superposition coding is used to multiplex multiple data series, then transmission capacity is improved, but interference between data series decreases transmission efficiency
Solution Approach 1:
The patent introduces an intermediary processing stage that separates and processes different data series independently before recombination. This intermediary approach allows multiple data series to be transmitted simultaneously through superposition coding while reducing mutual interference through dedicated processing paths for each data series.
3Reliability
If reception device includes arithmetic resources for re-modulating decoded data, then decoding performance is improved, but device complexity increases
Solution Approach 1:
The patent implements partial re-modulation functionality, where only essential re-modulation operations are performed based on specific decoding requirements. This selective approach maintains decoding performance where necessary while avoiding unnecessary arithmetic operations that would increase device complexity.
Data Source
AI summary
A transmission device includes: a first mapper that maps a first bit stream of a first data series to generate a first modulated symbol stream of the first data series; a second mapper that maps a second bit stream of a second data series to generate a second modulated symbol stream of the second data series; a converter that subjects the second modulated symbol stream to conversion in accordance with the first modulated symbol stream; a superposition unit that superposes the first modulated symbol stream and the second modulated symbol stream at a predetermined amplitude ratio to generate a multiplexed signal, the second modulated symbol stream having been subjected to the conversion in accordance with the first modulated symbol stream; and a transmitter that transmits the multiplexed signal.