Backscatter Resource Allocation Using Frequency Offsets
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Solution Overview
Problem
In backscatter communication systems, multiple backscatter devices transmitting on the same frequency at the same time can cause access failures and reduce the success rate due to resource conflicts.
Innovation Solution
The method involves determining a first resource based on a candidate resource, using a first offset step and a first factor to reduce the probability of resource conflicts, and employing pseudo-random signals to stagger frequency domain resources, thereby improving access success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple backscatter devices transmit on the same frequency at the same time, then the communication system can support multiple devices, but resource conflicts occur and access success rate decreases
Solution Approach 1:
The patent segments the frequency resources by introducing frequency offsets for different backscatter devices. Each device transmits on a different frequency resource (ƒe+Δƒ1, ƒe+Δƒ2, etc.), dividing the shared frequency channel into multiple distinct frequency slots. This segmentation eliminates resource conflicts while supporting multiple devices, thereby maintaining access success rate.
Solution Approach 2:
The patent transitions from time-domain multiplexing to frequency-domain multiplexing by introducing frequency offsets. Instead of devices transmitting at different times (time dimension), they transmit simultaneously on different frequencies (frequency dimension). This dimensional change allows multiple devices to coexist without resource conflicts, improving both device capacity and access reliability.
2Device complexity
If backscatter devices use the same resource, then device complexity is reduced, but conflicts increase and access success rate deteriorates
Solution Approach 1:
The patent implements self-service resource allocation where each backscatter device autonomously determines its frequency resource based on a predefined offset value. The device selects its frequency as ƒe+Δƒ, where Δƒ is its unique offset. This self-service mechanism eliminates the need for complex centralized resource allocation while ensuring unique resource assignment, maintaining low device complexity while improving access success rate.
Data Source
AI summary
A backscatter communication method and apparatus provides operation including: receiving a first excitation signal from a first device; determining a first resource based on a candidate resource; and sending a backscattered signal of the first excitation signal to a second device based on the first resource. This can reduce a probability of selecting a same resource as another device to some extent, so that a conflict is reduced, and an access success rate of a backscatter device can be improved.