UWB Phase Frame Timing for Wider Coverage and Precision
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Solution Overview
Problem
Conventional UWB positioning devices have limited coverage due to transmit power restrictions and signal attenuation, which affects the precision and range of phase information-based positioning.
Innovation Solution
A phase determining method and apparatus that involves generating frames with unequal time intervals between segments and segment groups to allow for antenna switching, reducing frequency offset errors, and enhancing signal coverage by adjusting impulse density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If transmit power is increased to improve signal coverage, then coverage distance is improved, but transmit power exceeds the regulatory limit of -41.3 dBm/MHz
Solution Approach 1:
The patent applies periodic action by using pulsed UWB signals instead of continuous transmission. The impulse radio technology transmits energy in short nanosecond-level pulses, allowing the system to accumulate sufficient energy for long-range communication while keeping the average power within regulatory limits. This periodic pulse transmission enables coverage extension without violating the -41.3 dBm/MHz power spectral density constraint.
Solution Approach 2:
The patent changes the temporal distribution parameter of signal transmission by using unequal time intervals between segments and segment groups. This parameter change allows optimization of both coverage and precision: longer intervals between segment groups reduce average impulse density for extended coverage, while sufficient intervals between segments enable antenna switching for precision maintenance.
2Measurement precision
If time interval between segments is increased to allow antenna switching, then measurement precision is improved, but signal transmission time increases
Solution Approach 1:
The patent applies dynamics by using unequal time intervals rather than fixed intervals. The time interval between adjacent segments is set to a first value sufficient for antenna switching and precision measurement, while the time interval between adjacent segment groups is set to a second value optimized for coverage. This dynamic adjustment of time parameters allows the system to optimize both precision and transmission efficiency for different portions of the signal structure.
3Measurement precision
If impulse density is increased to improve positioning precision, then measurement accuracy is improved, but coverage distance is reduced
Solution Approach 1:
The patent applies segmentation by dividing the training sequence into multiple segments grouped into segment groups. This segmentation allows different time interval parameters to be applied: the first time interval between segments maintains sufficient impulse density for positioning precision, while the second time interval between segment groups reduces overall average impulse density to extend coverage. The segmented structure enables simultaneous optimization of both precision and coverage.
Data Source
AI summary
A phase determining method and an apparatus are provided, which are applied to the field of communication technologies, for example, applied to a UWB-based WPAN system, for example, an 802.15.4a protocol, an 802.15.4z protocol, or an 802.15.4ab protocol in 802.15 series protocols, and also applied to a sensing system. The method includes: A transmit end generates a first frame, and then sends the first frame. In this way, a receive end may receive the first frame, and determine phase information based on the first frame. The first frame may include a first CTS, the first CTS includes at least two segment groups, a time interval between adjacent segments in each segment group is a first time interval, and a time interval between adjacent segment groups is a second time interval. Coverage of the first frame is effectively improved.