ISAC Precoder Selection Under Cyclic Shift Port Virtualization
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Solution Overview
Problem
Cyclic shift port virtualization in 5G NR waveforms for sensing enhances sensing performance but deteriorates communication performance in joint communication and sensing scenarios.
Innovation Solution
An integrated sensing and communication (ISAC) node employs cyclic shift diversity and precoder selection to align communication directions with minimal capacity loss, using orthogonal frequency domain multiplexing signals and virtual receiving arrays to minimize the impact of cyclic shift port virtualization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cyclic shift port virtualization is applied to enhance sensing performance, then sensing performance is improved, but communication performance deteriorates
Solution Approach 1:
The patent changes the parameter of precoder selection by aligning communication directions with minimal capacity loss based on sounding results, rather than using fixed cyclic shift patterns. This dynamic parameter adjustment resolves the contradiction by adapting the communication parameters to minimize interference while maintaining sensing capabilities.
Solution Approach 2:
The system dynamically selects precoders based on real-time sounding results and channel conditions, rather than using static cyclic shift configurations. This dynamic adaptation allows the system to optimize communication performance for each transmission based on actual channel state, resolving the performance deterioration caused by fixed cyclic shift port virtualization.
2Measurement precision
If cyclic shift diversity is applied to RF signals, then sensing capabilities are enhanced, but communication capacity is reduced
Solution Approach 1:
The patent changes the precoder parameters dynamically based on sounding results, selecting precoders that minimize capacity loss rather than using fixed cyclic shift patterns. This parameter optimization resolves the contradiction by adjusting communication parameters to maintain capacity while preserving sensing enhancements.
Solution Approach 2:
The system uses sounding results as feedback to select appropriate precoders for communication transmissions. This feedback mechanism allows the system to learn the channel characteristics and adjust precoder selection accordingly, resolving the capacity reduction issue while maintaining cyclic shift diversity benefits for sensing.
3Productivity
If precoders are selected to align communication directions with minimal capacity loss, then communication efficiency is improved, but system complexity increases
Solution Approach 1:
The patent performs preliminary sounding to obtain channel information before actual communication transmissions. This preliminary action provides the necessary feedback for precoder selection, simplifying the real-time decision-making process while achieving optimal communication efficiency without excessive complexity during data transmission.
Data Source
AI summary
A method of joint communication and sensing of a target obstacle includes deploying an integrated sensing and communication (ISAC) node having an ISAC transmitter having M transmitting antenna(s) and a radar receiver having L receiving antenna(s), wherein the M and L are integers; transmitting radio frequency (RF) signals carrying data to a communication receiver by the M transmitting antenna(s) of the ISAC transmitter; receiving radio frequency (RF) signals reflected by the target obstacle by the L receiving antenna(s); and obtaining a sounding result based on the reflected radio frequency (RF) signals; wherein the RF signals are applied with cyclic shift diversity; and wherein the RF signals contain precoders which are selected by aligning a range of communication direction linked to a communication channel between the ISAC node and the communication receiver with minimal capacity loss based on the sounding result.