Non-Coherent Wireless Waveforms Without CSI Overhead
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Solution Overview
Problem
Conventional wireless communication networks, particularly 5G and 5G NR, face challenges with high power and processing resource consumption due to coherent encoding and decoding schemes, which are susceptible to interference and the Doppler effect, leading to degraded performance in mobile devices.
Innovation Solution
Implementing non-coherent encoding and decoding techniques, such as differential encoding, that operate independently of channel state information and reduce the need for reference signals, allowing for reduced power and processing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coherent encoding and decoding schemes are used, then reliability is improved, but power consumption and processing resource consumption increase
Solution Approach 1:
The patent extracts and removes the reference signal transmission and channel estimation processes from the coherent decoding system. By using non-coherent differential decoding, the system eliminates the need for pilot signals and channel state information feedback, thereby reducing power consumption while maintaining acceptable reliability through differential encoding that is inherently more robust to channel variations
Solution Approach 2:
The patent changes the fundamental parameter of decoding approach from coherent (requiring channel state information) to non-coherent (using differential encoding). This parameter change transforms the system from one that requires extensive processing and power for channel estimation to one that uses simpler differential decoding, reducing power consumption while maintaining reliability in mobile scenarios
2Measurement precision
If coherent encoding and decoding schemes are used, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent removes the channel estimation and channel state information feedback mechanisms from the system. By adopting non-coherent differential decoding, the complexity of channel tracking, reference signal processing, and adaptive modulation based on CSI is eliminated, significantly reducing device complexity while maintaining measurement precision through differential encoding that is inherently robust to channel variations
Solution Approach 2:
Instead of using channel state information to improve decoding accuracy (coherent approach), the patent inverts the approach by using differential encoding where the information is embedded in the phase difference between consecutive symbols. This inversion eliminates the need for channel estimation while maintaining decoding precision, thereby reducing device complexity
3Reliability
If reference signals are transmitted for channel estimation, then reliability is improved, but loss of time increases
Solution Approach 1:
The patent extracts and eliminates reference signal transmissions from the communication protocol. By using non-coherent differential decoding, the system removes the time overhead associated with pilot signals, synchronization sequences, and channel estimation procedures, thereby reducing time loss while maintaining demodulation accuracy through differential encoding that is inherently robust to timing variations and channel changes
Data Source
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AI summary
In one aspect, performing, by a wireless communication device, a non-coherent encoding operation on first data to generate a first transmission, wherein the non-coherent encoding operation encodes data independent of channel state information (CSI); and transmitting, by the wireless communication device, the first transmission, wherein the first transmission is non-coherently encoded. In another aspect, receiving, by a wireless communication device, a first transmission, wherein the first transmission is non-coherently encoded independent of channel state information (CSI); and performing, by the wireless communication device, a non-coherent decoding operation on the first transmission to decode the first transmission. Other aspects and features are also claimed and described.