Wireless Channel Measurement Through Flexible Frequency Band Splicing
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Solution Overview
Problem
Existing communication systems face challenges in achieving accurate ranging and channel state measurement due to the high computational and power costs associated with large bandwidths, which are necessary for precise distance and position estimation in wireless communication devices.
Innovation Solution
A flexible channel state measurement scheme is implemented using frequency band splicing, combining channel state information obtained in different, partially overlapping frequency bands to extend the effective measurement range beyond conventional limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If large bandwidth is used for channel state measurement, then ranging resolution and accuracy are improved, but computational cost and power consumption increase
Solution Approach 1:
The patent divides the frequency band into multiple sub-bands and performs channel state measurement separately in each sub-band. This segmentation allows the system to achieve accurate ranging by combining measurements from multiple narrower bands, avoiding the need for a single wideband measurement that would consume excessive power and computational resources.
Solution Approach 2:
The patent transitions from time-domain wideband measurement to frequency-domain splicing by measuring channel state in multiple frequency sub-bands and combining them. This dimensional transformation in the frequency domain enables achieving wideband ranging resolution through narrowband measurements, reducing power consumption while maintaining measurement precision.
2Measurement precision
If large bandwidth is used for channel state measurement, then ranging resolution and accuracy are improved, but computational resources increase
Solution Approach 1:
The patent segments the frequency band into multiple sub-bands and performs independent channel state measurements in each sub-band. This segmentation reduces the computational complexity of each individual measurement while achieving the same overall ranging resolution by splicing the results from multiple sub-bands.
Solution Approach 2:
The patent moves the measurement process from the time domain to the frequency domain, where channel state information can be measured and spliced across multiple frequency sub-bands. This dimensional change enables efficient computational processing of narrowband measurements that are later combined to achieve wideband ranging accuracy.
3Measurement precision
If frequency band splicing is used to extend measurement range, then ranging resolution is improved, but system complexity increases
Solution Approach 1:
The patent segments the frequency spectrum into multiple manageable sub-bands that can be measured independently. Each sub-band measurement is processed separately and then spliced together, which simplifies the overall system architecture compared to implementing a single wideband measurement system while achieving extended measurement range and improved resolution.
Data Source
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AI summary
A wireless transmitter (110) and a wireless receiver (160) for communication via a communication channel (150) are disclosed. The transmitter (110) is configured to generate a first pilot signal having a first signal strength profile over a first plurality of frequency sub-bands and a second pilot signal having a second signal strength profile over a second plurality of frequency sub-bands and to transmit the first pilot signal and the second pilot signal via the communication channel (150) to the wireless receiver (160). The first plurality of frequency sub-bands and the second plurality of frequency sub-bands comprise at least three common frequency sub-bands, wherein the common frequency sub-bands comprise at least one central common frequency sub-band and two boundary common frequency sub-bands, wherein a respective signal strength of the at least one central common frequency sub-band is smaller than a respective signal strength of the two boundary common frequency sub-bands.