Zadoff-Chu Reference Signaling for Millimeter Wave Networks
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Solution Overview
Problem
High-frequency wireless communication systems, particularly at millimeter wave frequencies, face challenges with beamforming and timing issues, leading to complications in handling reference signaling effectively.
Innovation Solution
The use of DFT-s-OFDM-based waveforms with Zadoff-Chu sequences for transmitting and receiving reference signaling, optimizing power amplification and reducing sideband interference by providing low Peak-to-Average-Power Ratio (PAPR) characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If higher frequencies are used for wireless communication, then large bandwidths can be utilized, but new problems arise regarding physical properties and timing
Solution Approach 1:
The patent changes the fundamental parameter of reference signaling from traditional pseudo-random sequences to Zadoff-Chu sequences, which have inherent low PAPR properties. This parameter change enables the system to maintain reliability at high frequencies by reducing peak power demands that would otherwise cause distortion in power amplifiers operating at millimeter wave frequencies
2Measurement precision
If beamforming with small beams is used, then directional communication is improved, but handling reference signaling becomes more complicated
Solution Approach 1:
The patent changes the sequence type parameter to Zadoff-Chu sequences, which maintain their low PAPR特性 even when applied to beamformed signals. This allows the system to use directional small beams for precise communication while the reference signaling remains simple to handle due to the inherent properties of ZC sequences
Solution Approach 2:
The patent separates the reference signaling function from the data transmission function by using dedicated ZC sequences for reference purposes. This segmentation allows beamforming to be applied independently to data signals while reference signals maintain their simplified structure through the use of ZC sequences with known autocorrelation properties
3Loss of time
If conventional reference signaling is used at high frequencies, then timing issues arise, but switching to new sequences requires validation
Solution Approach 1:
The patent changes the sequence parameter from conventional pseudo-random sequences to Zadoff-Chu sequences, which have ideal autocorrelation properties. This parameter change directly addresses timing issues at high frequencies by providing sequences that maintain their correlation properties even under the stringent timing requirements of millimeter wave communication
Solution Approach 2:
The patent utilizes the ideal autocorrelation property of Zadoff-Chu sequences as a feedback mechanism for timing synchronization. The predictable correlation peak provides a reliable reference for timing alignment, allowing the system to compensate for timing drift and maintain accurate synchronization at high frequencies
Data Source
AI summary
There is disclosed a method of operating a transmitting radio node in a wireless communication network. The transmitting radio node is adapted to transmit communication signaling utilising a DFT-s-OFDM-based waveform. The method includes transmitting reference signaling, the reference signaling being based on a Zadoff-Chu sequence. The disclosure also pertains to related devices and methods.