Transmitter and receiver using orthogonal signal mapping
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Solution Overview
Problem
Conventional bi-orthogonal modulation methods increase information transmission efficiency but suffer from decision errors in noisy communication channels, leading to errors in transmitted information.
Innovation Solution
A transmitter and receiver system that maps modulation symbols based on the probability of decision errors between orthogonal signals, using a symbol mapper and determiner to associate information words with orthogonal signals, reducing errors by maximizing Hamming distance and inter-signal point distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If bi-orthogonal modulation method is used to increase the number of orthogonal signals, then frequency utilization efficiency is improved, but decision errors occur in noisy channels leading to information errors
Solution Approach 1:
The patent changes the mapping parameters between information words and orthogonal signals by considering Hamming distance and inter-signal point distance. The symbol mapper is configured to map information words to orthogonal signals such that combinations of information words with large Hamming distance are associated with combinations of orthogonal signals having large inter-signal point distances, thereby reducing decision errors while maintaining high frequency utilization efficiency
Solution Approach 2:
The patent performs preliminary configuration of the association between information words and orthogonal signals before transmission. By pre-establishing the mapping relationship based on distance metrics, the system prepares optimal signal assignments that minimize decision errors during reception without affecting the high signal count needed for frequency efficiency
2Loss of information
If the number of orthogonal signals is increased to transmit more information per symbol, then information transmission capacity increases, but the probability of decision errors between signals increases
Solution Approach 1:
The patent addresses this contradiction by changing the mapping parameters to consider both the number of orthogonal signals and their geometric relationships. The symbol mapper uses Hamming distance and inter-signal point distance as mapping criteria, ensuring that increased signal count does not compromise decision accuracy through poor signal assignment
Solution Approach 2:
The patent combines multiple distance metrics (Hamming distance and inter-signal point distance) to create a composite mapping strategy. This composite approach allows the system to simultaneously achieve high information capacity through multiple orthogonal signals and high reliability through optimized signal selection based on multiple criteria
Data Source
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AI summary
A transmitter for use in a communication system uses a orthogonal modulation method, and the transmitter includes: an orthogonal sequence prescriber (12) that prescribes association between orthogonal signals and information words determined on the basis of sizes of differences between information words of a plurality of mutually different information words and a probability of occurrence of decision errors between orthogonal signals of a plurality of mutually orthogonal signals; and a symbol mapper (11) that, upon input of any of the information words, generates modulation symbols based on the orthogonal signals associated with the input information word according to the associations prescribed by the orthogonal sequence prescriber (12).