Interlace Pattern Selection for Low CM PAPR Transmission
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Solution Overview
Problem
Current wireless communication technologies face inefficiencies when transitioning from licensed to unlicensed frequency spectra, particularly in the uplink, due to differences in absorption and regulatory requirements, which can limit transmission power and degrade performance when coexisting with other technologies like Wi-Fi.
Innovation Solution
The use of interlacing techniques for resource block allocation and clustered DFT-S-OFDM modulation in the uplink transmission, allowing for adaptable transmission characteristics and reduced Peak to Average Power Ratio (PAPR) and Cubic Metric (CM), enabling higher transmission power while meeting regulatory requirements for maximum Power Spectral Density (PSD) and bandwidth occupancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional transmission techniques are used in unlicensed spectrum, then transmission can be performed, but transmission power is limited and performance degrades due to regulatory requirements and coexistence with other technologies
Solution Approach 1:
The transmission signal is segmented into multiple interlaced resource blocks distributed across different frequency subbands. This segmentation allows the transmission to meet PSD masks by spreading power across frequency while maintaining overall transmission power through the interlacing structure
Solution Approach 2:
The patent changes the transmission parameters by using clustered DFT-S-OFDM modulation with specific cluster sizes and interlacing patterns. This parameter change optimizes the signal characteristics to achieve lower PAPR and CM, enabling higher transmission power while complying with unlicensed spectrum regulations
2Reliability
If transmission power is increased to improve signal quality, then signal quality improves, but regulatory requirements for maximum PSD and bandwidth occupancy are violated
Solution Approach 1:
By segmenting the transmission into interlaced resource blocks across multiple subbands, the patent achieves frequency diversity and robust signal quality while distributing the power spectral density to meet regulatory masks. The interlacing ensures no single subband exceeds PSD limits while maintaining overall transmission quality
Solution Approach 2:
The patent employs dynamic interlace pattern selection and clustered DFT-S-OFDM parameters that can be adapted to different channel conditions and regulatory requirements. This dynamic approach allows optimization of signal quality while continuously complying with PSD and bandwidth occupancy constraints
3Power
If interlacing techniques with clustered DFT-S-OFDM are used, then PAPR and CM are reduced allowing higher transmission power, but device complexity increases
Solution Approach 1:
The interlacing technique segments resource blocks into structured patterns across subbands, which simplifies the complexity management by providing a regular, predictable structure. This segmentation enables efficient implementation of clustered DFT-S-OFDM with reduced computational overhead compared to unstructured approaches
Solution Approach 2:
By changing to clustered DFT-S-OFDM with specific cluster configurations and interlacing patterns, the patent reduces PAPR and CM values, which directly enables higher transmission power. The parameter optimization balances the increased processing requirements against the significant gain in transmission power efficiency
Data Source
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AI summary
There is disclosed a network node (100) for a wireless communication network. The network node (100) is adapted for performing interlacing based on a time and/or frequency structure and/or resource structure.There are also disclosed related devices and methods.(Fig. 11)