LFM Sensing Codes for Multi-Node Signal Differentiation
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Solution Overview
Problem
Future wireless communication systems face challenges in enabling sensing services for multiple sensing nodes due to limited time-frequency resources in wireless communication channels.
Innovation Solution
Assigning distinct sensing codes with ordered sequences of rates to transmitter apparatus, using linear frequency modulated signals (LFMs) to differentiate between signals, allowing low complexity and low power receivers to distinguish between transmitters, reducing the need for time-frequency resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple sensing nodes share the same time-frequency resources, then resource utilization improves, but signal differentiation becomes difficult
Solution Approach 1:
The patent assigns different local qualities (distinct sensing codes with specific ordered sequences of rates) to different sensing nodes' signals. Each node's signal has a unique local characteristic defined by its sensing code, enabling differentiation while sharing the same time-frequency resources. The receiver can identify which node transmitted by detecting the specific rate sequence pattern in the received signal.
2Difficulty of detecting and measuring
If distinct sensing codes with ordered sequences of rates are assigned to different transmitter apparatus, then signal differentiation improves, but system complexity increases
Solution Approach 1:
The patent changes specific parameters (rates in the ordered sequence) of the sensing signals to create distinct sensing codes for different transmitters. Instead of using completely different signal structures, the system varies the rate parameters within the LFM framework, enabling signal differentiation through parameter variation rather than structural complexity.
3Adaptability or versatility
If LFM signals with different rates are used for sensing, then the number of distinguishable signals increases, but processing complexity at the receiver increases
Solution Approach 1:
The patent replaces complex mechanical or computational signal separation systems with a simpler rate-detection mechanism. Instead of using sophisticated signal processing to differentiate between multiple LFM signals, the receiver simply detects the rate parameter of the received signal, which directly identifies the transmitting node. This substitution dramatically reduces receiver complexity while maintaining the ability to distinguish many signals.
Data Source
AI summary
According to the present disclosure, a transmitter apparatus may transmit a sensing signal comprising an ordered sequence of linear frequency modulated signals (LFMs), in which each of the LFMs in the ordered sequence of LFMs has a slope specified by a corresponding rate in a sensing code. As different transmitter apparatus may be assigned distinct sensing codes, and thus sensing signals, a receiver apparatus can distinguish between sensing signals transmitted by different transmitter apparatus, even if they arrive at the same times and/or frequencies.