PPDU Synchronization Header Sequences for Multipath-Resistant UWB
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Solution Overview
Problem
Synchronization between transmitting and receiving devices in ultra-wideband (UWB) technology is crucial but challenging due to the use of nanosecond-level non-sinusoidal narrow pulses, which affects device power consumption and multipath interference.
Innovation Solution
Implementing synchronization header fields generated using binary sequences with specific cross-correlation or autocorrelation properties, such as binary phase shift keying (BPSK) sequences, to facilitate synchronization and reduce power consumption through on-off keying (OOK) modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nanosecond-level non-sinusoidal narrow pulses are used for data transmission in UWB technology, then high multipath resolution capability and low power consumption are achieved, but synchronization between transmitting and receiving devices becomes challenging
Solution Approach 1:
The patent applies preliminary action by inserting a synchronization header field at the beginning of the physical layer protocol data unit (PPDU) before the actual data transmission. This synchronization header field contains a synchronization sequence that is processed in advance by the receiving device to establish time alignment and frequency offset compensation before the narrow pulse data transmission begins, thereby resolving the synchronization challenge without affecting the multipath resolution capability
Solution Approach 2:
The patent uses an intermediary approach by introducing a dedicated synchronization header field as a mediator between the transmitting and receiving devices. This header field acts as a bridge to establish synchronization parameters (time alignment and frequency offset) before the actual narrow pulse data transmission, enabling the receiving device to properly interpret the subsequent nanosecond-level pulses without compromising the multipath resolution capability
2Measurement precision
If synchronization header fields with specific cross-correlation properties are used, then synchronization accuracy is enhanced, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by utilizing sequences with specific cross-correlation properties (such as m-sequences or Gold codes) in the synchronization header field. These sequences are carefully designed to provide optimal correlation characteristics for synchronization while maintaining reasonable computational complexity. The receiving device processes these sequences using standard correlation detection algorithms, achieving high synchronization accuracy without requiring overly complex transceiver structures
3Device complexity
If on-off keying modulation is used to simplify transceiver structure, then device power consumption is reduced, but transmission distance may be limited
Solution Approach 1:
The patent applies segmentation by dividing the physical layer protocol data unit into distinct fields, including a synchronization header field and a data field. The synchronization header field uses on-off keying modulation for simplified transceiver structure and low power consumption, while the data field can employ more sophisticated modulation schemes to extend transmission distance. This segmented approach allows each field to be optimized for its specific requirements without compromising the overall system performance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances synchronization accuracy, reduces packet error rates, and improves transmission distance and system performance by resisting multipath interference.
Implementation Method 1
a side lobe of a periodic cross-correlation function of the first sequence and the second sequence is a constant value
Implementation Method 2
sending a physical layer protocol data unit PPDU on a target channel
Data Source
AI summary
A method and an apparatus for transmitting a physical layer protocol data unit (PPDU) are provided. The method includes: generating a synchronization header field based on a first sequence or a third sequence, where a side lobe of a periodic cross-correlation function of the first sequence and a second sequence is a constant value, the first sequence is a binary sequence consisting of 1 and 0, the second sequence is a binary phase shift keying sequence corresponding to the first sequence, a side lobe of a periodic autocorrelation function of the third sequence is a constant value, and the third sequence is a binary phase shift keying sequence consisting of 1 and −1; and sending the PPDU on a target channel, where the PPDU includes the synchronization header field.