PPDU Synchronization Header Using Constant-Sidelobe Sequences
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Solution Overview
Problem
Synchronization between transmitting and receiving devices is crucial in ultra-wideband (UWB) technology due to the use of nanosecond-level non-sinusoidal narrow pulses, but existing methods are inefficient and consume high power.
Innovation Solution
Implementing synchronization using a synchronization header field generated based on specific binary sequences with constant side lobes in the cross-correlation or autocorrelation functions, supporting OOK modulation and demodulation to simplify the transceiver structure and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional synchronization methods are used in UWB technology, then synchronization can be achieved, but power consumption is high and efficiency is low
Solution Approach 1:
The patent changes the parameters of the synchronization signal by using a specific binary sequence (first sequence) with constant side lobes in its periodic cross-correlation function. This sequence is modulated using on-off keying (OOK) to create a synchronization header field with optimized correlation characteristics that enable accurate synchronization while reducing power consumption compared to traditional methods
Solution Approach 2:
The patent employs periodic cross-correlation functions with constant side lobes in the synchronization header field. This periodic structure allows the receiving device to efficiently detect and synchronize with the transmitting device by exploiting the repeating correlation pattern, thereby achieving reliable synchronization with lower power consumption than aperiodic methods
2Measurement precision
If complex modulation schemes are used to improve synchronization, then synchronization accuracy improves, but transceiver structure becomes more complex
Solution Approach 1:
The patent simplifies the transceiver structure by using on-off keying (OOK) modulation combined with a specifically designed binary sequence. This parameter combination achieves accurate synchronization without requiring complex modulation schemes, thereby maintaining simple transceiver architecture while improving synchronization performance
Solution Approach 2:
The patent uses a binary sequence with constant side lobes in its periodic cross-correlation function, which creates a synchronization header field that can be easily copied and recognized by the receiving device. This copying approach enables accurate synchronization through simple correlation detection rather than complex modulation differentiation
3Length of moving object
If higher transmission power is used to increase transmission distance, then transmission distance increases, but packet error rate increases due to multipath interference
Solution Approach 1:
The patent converts the harmful multipath interference into a beneficial effect by using a synchronization header field with constant side lobes in its periodic cross-correlation function. This structure enables the receiving device to distinguish between direct and reflected paths through correlation detection, thereby reducing packet error rates caused by multipath interference while maintaining long transmission distance
Solution Approach 2:
The patent changes the correlation parameters of the synchronization signal by using a binary sequence with constant side lobes. This parameter modification enables better resolution of multipath components and improved packet detection accuracy, thereby reducing packet error rates while maintaining extended transmission distance
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.