Digital Chaos Spreading for Range Extension in Heterogeneous Networks
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Solution Overview
Problem
Current wireless communication systems face challenges in increasing transmission range without reducing data rate, while minimizing interference and maintaining network capacity, especially in heterogeneous networks with multiple users and interference from external sources.
Innovation Solution
The system employs digital chaos spreading sequences for signal aggregation and modulation, using oversampled baseband signals, sparse vector processing, and hash functions to reduce peak-to-average power ratio (PAPR) and enhance network capacity, while maintaining low probability of intercept (LPI) and low probability of detection (LPD).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If transmit power is increased to extend transmission range, then transmission range is improved, but interference to other users increases
Solution Approach 1:
The patent changes the fundamental parameter of signal representation from conventional waveforms to digital chaos waveforms. This transformation allows the signal to maintain lower peak power while achieving extended transmission range through the inherent properties of chaos signals, such as their wide spectral distribution and autocorrelation characteristics, thereby reducing interference to other users.
Solution Approach 2:
The patent embeds digital signals and information within specific temporal and spectral regions of the chaos waveform. By localizing the information content within the broader chaos signal structure, the system achieves reliable communication without requiring high transmit power across the entire signal, thus extending range while minimizing interference.
2Length of stationary object
If data rate is reduced to extend transmission range, then transmission range is improved, but network capacity decreases
Solution Approach 1:
The patent transitions from conventional single-dimension modulation to multi-dimensional chaos-based transmission. By utilizing the complex temporal and spectral structure of digital chaos waveforms, the system can embed multiple data streams and achieve higher effective data rates without extending transmission range, thus maintaining network capacity while achieving range extension through the chaos signal's inherent properties.
3Productivity
If multiple signals are aggregated to increase network capacity, then network capacity is improved, but signal detection complexity increases
Solution Approach 1:
The patent uses digital chaos waveforms as an intermediary carrier for multiple aggregated signals. The chaos signal's unique autocorrelation properties and wide spectral distribution allow multiple embedded signals to be transmitted simultaneously without requiring complex detection algorithms at the receiver, thereby increasing network capacity while keeping detection complexity manageable through the intermediary chaos waveform structure.
Data Source
AI summary
The present invention teaches a system and method for improved signal recovery for range and coverage extension in a heterogeneous cooperative network of digital chaos transmissions with OFDM component signal transmission. The invention improves upon the state of art in side channel information from the transmit side containing information on the clipped amplitude. In-band transmission of the side information is achieved by exploiting the sparsity of the resulting clip amplitude position with improved levels of compression over the prior art using Gabor Transform Multiple Symbol Encoding transmitter. The information rate of the clipped amplitude is sub-Nyquist relative to the original OFDM component signal transmission, which allows very low power spreading by a cooperative digital chaos sequences at a transmit side and recovery of the clipped amplitude at a receive side. Further, an improved noise resistance side channel performance is achieved by decoding Gabor Transform symbols for symbol recovery.