Multiplexing Data and Radar Signals via Time-Frequency Grid
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently multiplexing data and radar transmissions, particularly in 5G networks, where radar excitation signals interfere with data communications, limiting unambiguous range and velocity resolution, and requiring complex full-duplex transceivers for simultaneous transmission and reception.
Innovation Solution
The method involves scheduling and multiplexing radar and data transmissions using a grid of time-frequency resources, allowing radar signals to be transmitted on specific beams and cells, while data is transmitted on orthogonal resources, using a configurable time-frequency comb signal for radar excitation, and grouping radar transmissions across spatial resources to simplify signaling and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If radar excitation signals are transmitted simultaneously with data communications on the same spatial beam, then hardware complexity is reduced, but signal interference occurs limiting unambiguous range and velocity resolution
Solution Approach 1:
The time-frequency resource grid is segmented into distinct regions for radar excitation signals and data communications. Radar transmissions are allocated specific time slots and frequency resources, while data transmissions use orthogonal resources. This segmentation allows both signal types to coexist on the same spatial beam without mutual interference, resolving the contradiction between hardware simplicity and measurement precision.
Solution Approach 2:
The patent introduces time and frequency dimensions as orthogonal resources for multiplexing radar and data transmissions. By utilizing a two-dimensional time-frequency grid where radar and data signals occupy different cells, the system achieves simultaneous transmission without interference. This dimensional separation allows the same spatial beam to carry both signal types with full resolution capability.
2Productivity
If full-duplex transceivers are used for simultaneous transmission and reception, then radar and data can be transmitted simultaneously, but device complexity increases
Solution Approach 1:
The existing communication transceiver is designed to perform multiple functions: it can transmit data signals, transmit radar excitation signals, and receive radar returns using the same hardware components. The time-frequency grid scheduling mechanism enables the transceiver to switch between different transmission modes without requiring separate full-duplex hardware, thus achieving simultaneous transmission capability while avoiding increased device complexity.
3Object-affected harmful factors
If radar transmissions are scheduled on specific time-frequency resources, then interference with data communications is reduced, but scheduling complexity increases
Solution Approach 1:
The scheduling of radar and data transmissions is performed in advance by the network node before actual signal transmission. The time-frequency grid is pre-configured with allocated resources for both signal types, and scheduling decisions are made beforehand based on traffic patterns and interference constraints. This preliminary scheduling action minimizes real-time interference while keeping the scheduling mechanism manageable through pre-computed resource allocation.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for signal multiplexing of data and radar transmissions. For instance, certain embodiments may provide a configurable time and frequency domain comb signal for radar excitation on a spatial beam and/or multiplexing data communications and radar signals in time, frequency, and/or spatial domains (e.g., beams).