Variable Bandwidth Wireless Channel Measurement Using Dynamic Sampling
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Solution Overview
Problem
Conventional wireless channel measurement methods require multiple transmitters and receivers to measure channels of varying bandwidths, as they are limited to measuring a single fixed bandwidth, leading to inefficiencies and increased operational complexity.
Innovation Solution
A method that creates a variable bandwidth signal by fixing the digital-to-analog (D/A) operation speed and varying over-sampling according to the measurement bandwidth in the transmitting part, and varying the receiving intermediate frequency and analog-to-digital (A/D) operation speed in the receiving part, allowing for the measurement of multiple bandwidths with a single transmitter and receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional wireless channel measurement method uses a fixed bandwidth transmitter and receiver, then the device structure is simple, but multiple devices are required to measure channels of varying bandwidths
Solution Approach 1:
The patent applies dynamics by making the sampling rate variable rather than fixed. The transmitter adjusts the D/A converter sampling rate according to the desired measurement bandwidth, and the receiver adjusts the A/D converter sampling rate accordingly. This dynamic adjustment allows a single transmitter-receiver pair to measure channels across multiple bandwidths (e.g., 5MHz, 10MHz, 20MHz, 40MHz, 100MHz) without requiring multiple fixed-bandwidth devices, thus resolving the contradiction between versatility and device quantity.
2Adaptability or versatility
If multiple transmitters and receivers are used to measure different bandwidths, then measurement coverage is complete, but operational complexity increases
Solution Approach 1:
The patent implements universality by designing a single transmitter and receiver that can perform multiple bandwidth measurement functions. The transmitter includes a D/A converter with variable sampling rate capability, and the receiver includes an A/D converter with variable sampling rate capability. By controlling the sampling rates of these converters, the same hardware can measure wireless channels across different bandwidths (5MHz, 10MHz, 20MHz, 40MHz, 100MHz), eliminating the need for multiple specialized devices and significantly reducing operational complexity.
3Adaptability or versatility
If the D/A operation speed is varied to achieve different bandwidths, then bandwidth adaptability is achieved, but system stability decreases
Solution Approach 1:
The patent applies parameter changes by systematically adjusting the sampling rate parameter of the D/A and A/D converters according to the desired measurement bandwidth. For each bandwidth (5MHz, 10MHz, 20MHz, 40MHz, 100MHz), specific sampling rates are set (e.g., 40MHz, 80MHz, 160MHz, 320MHz, 1000MHz). This controlled parameter adjustment allows the system to adapt to different bandwidth requirements while maintaining stable and consistent measurement performance through predefined sampling rate configurations.
Data Source
AI summary
Provided are a method for measuring a variable bandwidth wireless channel, and a transmitter and a receiver therefore. The transmitter, includes: a pre-processing unit for performing variable over-sampling and band-limited filtering on an original sequence for measuring the wireless channel according to a pre-determined digital-to-analog (D/A) operation speed and measurement bandwidth, and creating and storing a probing sequence whose frequency is up-converted into a fixed transmitting intermediate frequency; and a real-time processing unit for transmitting a probing signal that the stored probing sequence is converted according to the D/A operation speed to the wireless channel.