Cluster-Based Mm-Wave Radar-Communication Multiplexing With Narrow Beams
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Solution Overview
Problem
Existing radar and communication systems operating in the mm-wave band face interference issues due to sharing the same frequency and time, leading to spectrum scarcity and inefficiencies in spectral, energy, and hardware utilization, with co-design approaches adding complexity and cost, while coexistence methods fail to effectively separate signals without additional hardware.
Innovation Solution
A method for cluster-based multiplexing of radar and communication signals in the mm-wave band that exploits channel sparsity, using independent narrow beams transmitted at different angles to separate signals in the spatial domain without additional hardware complexity, employing digital beamforming and spatial multiplexing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If radar and communication systems operate independently in the same frequency band (coexistence approach), then spectrum utilization is improved, but interference between the two systems increases
Solution Approach 1:
The patent segments the spatial domain by transmitting radar and communication signals through different narrow beams at different angles. This spatial segmentation allows both signals to coexist in the same frequency band while being separated at the receiver through angle-based discrimination, thus improving spectrum utilization while minimizing interference.
Solution Approach 2:
The patent introduces the spatial angular dimension as an additional degree of freedom for signal separation. By transmitting signals at different angles and using multiple antenna arrays, the system separates radar and communication signals in the spatial domain, enabling frequency band sharing without interference.
2Device complexity
If a single waveform is used for both radar and communication (co-design approach), then hardware complexity is reduced, but radar or communication functionality is compromised
Solution Approach 1:
The patent segments the signal transmission by using separate narrow beams for radar and communication functions. Each beam is optimized for its specific function while both share the same hardware platform and frequency band, maintaining hardware simplicity while preserving functional performance.
Solution Approach 2:
The patent implements a universal hardware platform that supports both radar and communication functions simultaneously. The same antenna arrays and signal processing infrastructure are used for both functions, achieving multi-functionality without compromising the performance of either function.
3Measurement precision
If multiple narrow beams are transmitted for each function, then signal separability is improved, but device complexity increases
Solution Approach 1:
The patent segments the beamforming process into dedicated radar beams and communication beams with different angular directions. This segmentation enables clear signal separation at the receiver while using standard digital beamforming techniques that are already widely implemented, avoiding excessive complexity.
Data Source
AI summary
Disclosed is a novel method proposed for Radar and Communication coexistence in the mm Wave band by exploiting channel sparsity which is described by the geometrical channel model. The joint transmitter and receiver in bistatic broadcast joint radar and communication (JRC) system have multiple collocated antennas.