UWB Synchronization Using Alternating Pulse Sequences
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Solution Overview
Problem
In impulse-UWB systems, achieving synchronization is challenging due to high sampling rates and low precision quantification, leading to large quantization noises and processing delays, making existing synchronization methods ineffective for high-speed applications.
Innovation Solution
A synchronization method using a frame structure with a preamble symbol part containing alternating positive and negative pulse sequences and a co-current pulse sequence, where sampled data are processed through a series of operations including subtraction, phase inversion, addition, time delay, correlation, and decision-making to rapidly determine synchronization, reducing storage needs and enabling real-time synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high speed sampling is used in impulse-UWB systems, then transmission speed is improved, but quantization noise increases due to low precision quantification
Solution Approach 1:
The patent combines multiple periodic signals through accumulation to enhance the signal-to-noise ratio. By merging N periodic signals with the same frequency and phase, the useful signal components add up constructively while random quantization noises tend to cancel out, thereby improving measurement precision without reducing transmission speed
Solution Approach 2:
The patent uses periodic signals as copies of the original synchronization signal. By transmitting multiple periodic copies and accumulating them at the receiver, the system can recover the synchronization information more accurately despite low precision quantification, as each periodic copy provides redundant information that helps overcome quantization noise
2Measurement precision
If sliding cumulative process is used for channel estimation, then channel response accuracy is improved, but processing delay and storage requirements increase
Solution Approach 1:
The patent segments the channel estimation process by using periodic signals with specific frequencies and phases. Instead of requiring a long continuous sliding window, the periodic structure allows the system to accumulate estimates at regular intervals, reducing the overall processing delay while maintaining estimation accuracy through targeted accumulation of periodic components
Solution Approach 2:
The patent employs periodic signals for channel estimation, where the known periodic structure allows the receiver to accumulate estimates at each period. This periodic action enables accurate channel estimation without requiring long processing windows, as the periodicity provides natural reference points for synchronization and estimation updates
3Device complexity
If peak detection or energy detection is used in impulse-UWB, then system complexity is reduced, but processing performance is restricted to lower speeds
Solution Approach 1:
The patent uses periodic signal copies to enable simple peak or energy detection while achieving high processing speeds. The periodic structure provides multiple opportunities for detection within each frame, and the accumulation process enhances the detection signal, allowing simple detectors to achieve high-speed performance that would otherwise require complex processing
Data Source
AI summary
A synchronization method for impulse system ultra-wideband takes frame as basic unit for data transmission, each frame is divided into a preamble symbol part and a data part, wherein the preamble symbol part sends a known impulse sequence for channel estimation and synchronization; the data part takes the information to be transmitted; the preamble symbol part is divided into two parts of a positive and negative impulse sequence, which includes odd impulses with alternant positive and negative polarities, and a same direction impulse sequence, which is composed of impulses with same polarity and is the same as the polarity of the last impulse in the positive and negative impulse sequence. The method provides such advantages as high synchronization precision, small storage space, and capability of immediately finding out the synchronization position etc., and provides an important value for the development of the impulse system ultra-wideband wireless communication technique.