ND-OTFS Constellation Mapping for Low-Complexity IoT BER Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems for resource-constrained IoT and M2M devices face challenges in achieving high reliability and low complexity, particularly in high-mobility scenarios, with conventional waveforms like OFDM and existing OTFS modulations not adequately addressing bit error rate (BER) improvements.
Innovation Solution
A low-complexity ND-OTFS modulation-based communication system with an adaptive N-D constellation mapper and receiver, utilizing an OTFS modulator and demodulator, along with optimized N-D signal constellations, to enhance BER performance and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional OFDM waveform is used, then device complexity is low, but BER performance deteriorates in high-mobility scenarios
Solution Approach 1:
The patent replaces the conventional OFDM waveform with OTFS modulation, substituting the time-frequency domain processing mechanism to achieve superior BER performance in high-mobility scenarios while maintaining acceptable device complexity through structured constellation mapping
Solution Approach 2:
The patent introduces N-dimensional constellation mapping (where N > 2) to extend the signal constellation from traditional 2D plane to higher-dimensional space, enabling improved BER performance by utilizing additional dimensional degrees of freedom for signal representation
2Reliability
If existing OTFS modulation with standard constellation is used, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent optimizes constellation parameters by selecting specific N-dimensional constellation configurations (where N > 2) that maximize minimum Euclidean distance between constellation points, improving BER performance while controlling device complexity through parameter optimization rather than structural complexity
Solution Approach 2:
The patent segments the constellation mapping process into systematic N-dimensional structures with defined geometric patterns, allowing efficient implementation through structured algorithms that reduce computational complexity while maintaining improved reliability
3Reliability
If 3D constellation mapping is used, then BER performance is improved, but receiver complexity increases
Solution Approach 1:
The patent extends signal constellation to N-dimensional space (N > 2) to improve BER performance by utilizing higher-dimensional geometric structures that provide larger minimum Euclidean distances, while the receiver complexity is managed through systematic de-mapping algorithms
4Reliability
If N-D constellation mapper is incorporated, then BER performance is significantly improved, but device complexity increases
Solution Approach 1:
The patent optimizes constellation parameters by selecting specific N-dimensional configurations that maximize minimum Euclidean distance between constellation points, improving BER performance while controlling device complexity through parameter optimization
Solution Approach 2:
The patent implements adaptive constellation mapping that can dynamically adjust N-dimensional constellation configurations based on channel conditions, allowing the system to optimize BER performance adaptively while managing device complexity through conditional processing
Data Source
AI summary
The present invention discloses a low-complex, reliable multidimensional orthogonal time-frequency space (ND-OTFS) modulation-based communication system for uplink and downlink wireless communication between resource-constrained Internet of Things (IoT) and machine-to-machine (M2M) devices comprising at least one transmitter configured to transmit bit stream involving N-Dimensional signal mapper and OTFS frame and at least one receiver configured to be integrated into said IoT or M2M devices, featuring a low-complexity detector for receiving the transmitted bit stream.