Spatial Precoding for Inter Symbol Interference Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless communication systems face challenges in reducing inter symbol interference (ISI) in single carrier systems, particularly due to atmospheric attenuation and blockage, as they rely on a single transmit and receive beam pair which is vulnerable to environmental factors.
Innovation Solution
The implementation of spatial precoding techniques, where wireless devices determine a weighted sum of multiple beams with different delays to form a spatial precoder, maximizing signal-to-interference noise ratios (SINR) by diversifying the number of beams carrying messages, allowing coherent reception over multiple paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single transmit and receive beam pair is used in single carrier systems, then device complexity is reduced, but reliability deteriorates due to vulnerability to atmospheric attenuation and blockage
Solution Approach 1:
The patent segments the single beam into multiple beams (first beam and second beam) with different delays. Each beam carries a portion of the transmitted signal, and the receiver combines these segmented beams to reconstruct the original signal. This segmentation provides diversity against blockage and atmospheric attenuation while maintaining manageable device complexity through structured beam processing.
Solution Approach 2:
The patent changes the delay parameter of the beams by introducing different delays (first delay and second delay) to the first and second beams respectively. This parameter change enables the beams to traverse different propagation paths and arrive at different times, providing temporal diversity that enhances reliability against atmospheric attenuation and blockage while the processing remains computationally feasible.
2Reliability
If multiple beams with different delays are used to form a spatial precoder, then signaling quality and SINR are improved, but device complexity increases
Solution Approach 1:
The patent extracts the essential parameters (complex gain values and delay parameters) from the multiple beams and transmits only these extracted parameters to the receiver. This extraction approach maintains high signaling quality by preserving the critical beam characteristics while reducing device complexity by eliminating the need to process and transmit the complete beam data, achieving efficient parameter-based beam management.
3Speed
If a single beam is used for transmission, then transmission speed is maintained, but harmful factors increase due to atmospheric attenuation and blockage
Solution Approach 1:
The patent introduces periodic time-varying complex gain values that modulate the first and second beams. This periodic modulation spreads the transmitted signal across multiple time instances and spatial paths, enabling the receiver to combine signals from different time periods. This approach maintains transmission speed while providing diversity against atmospheric attenuation and blockage through temporal and spatial spreading.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances signaling quality, increases SINR and signal-to-noise ratios (SNR), and provides resilient communication against blocking and atmospheric attenuation by optimizing beamforming across multiple paths.
Implementation Method 1
receiving, from a second wireless device and via a set of receive beams at the first wireless device, a set of reference signals associated with a set of transmit beams
Implementation Method 2
determine a weighted sum of several beams, each with a different delay to form a spatial precoder that increases (e.g., maximizes) signal to interference noise ratios
Implementation Method 3
optimizing beamforming across multiple paths
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Aspects of the present disclosure describe spatial precoding for inter symbol interference reduction in single carrier. Generally, the described techniques provide for one or more wireless devices (e.g., a user equipment (UE) and a network entity) to determine a weighted sum of several beams, each with a different delay, to form a spatial precoder that increases signal to interference noise ratios while improving signaling quality by diversifying the number of beams carrying subsequent messaging. The one or more wireless devices may determine complex gain values and delay parameters based on reference signals. The one or more wireless devices may utilize the complex gain values and delay parameters such that subsequent transmissions may be received coherently over multiple beams.