Satellite Tuner Bandwidth Allocation for Adjacent Channel Interference
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Solution Overview
Problem
Interference from adjacent channels in satellite broadcasting receivers due to frequency band similarities increases manufacturing costs and component count, as existing solutions like trap filters are inefficient.
Innovation Solution
Assigning bandwidth proportionally to each channel's symbol rate and maintaining a frequency interval between channels, with a tuner that adjusts bandwidth using equations based on symbol rate and frequency drifts to minimize noise and improve channel selection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a trap filter is installed to prevent adjacent channel interference, then reception quality is improved, but the number of components and manufacturing cost increase
Solution Approach 1:
The patent combines the trap filter function with the existing channel selection filter into a single integrated filter structure. The channel selection filter is configured to simultaneously perform channel selection and adjacent channel rejection, eliminating the need for a separate trap filter component while maintaining reception quality.
Solution Approach 2:
The channel selection filter is designed to perform multiple functions: it selects the desired channel frequency and simultaneously rejects adjacent channel interference. This multi-functional design replaces the traditional separate trap filter, reducing component count while improving overall system efficiency.
2Reliability
If a trap filter is installed to prevent adjacent channel interference, then reception quality is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the trap filter functionality into the channel selection filter, reducing the total component count. This integration simplifies the manufacturing process, reduces assembly steps, and lowers manufacturing costs while maintaining the ability to reject adjacent channel interference.
Solution Approach 2:
By designing the channel selection filter to perform both channel selection and adjacent channel rejection, the patent eliminates the need for additional trap filter components. This reduces material costs, assembly costs, and overall manufacturing complexity.
3Reliability
If bandwidth is increased to receive satellite broadcasting signals, then signal reception is improved, but adjacent channel interference increases
Solution Approach 1:
The patent applies local quality by configuring the channel selection filter with different characteristics at different frequency regions. The filter provides wide bandwidth for the desired channel while simultaneously creating narrow rejection bands at adjacent channel frequencies, achieving both good signal reception and effective interference rejection.
Solution Approach 2:
The patent dynamically adjusts filter parameters including center frequency and bandwidth based on the selected channel. The channel selection filter is reconfigured for each channel to optimize the balance between bandwidth for signal reception and notch depth for adjacent channel rejection, preventing interference while maintaining reception quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach optimizes bandwidth allocation, reduces noise interference, and allows for precise channel selection by accounting for frequency drifts, thereby enhancing the efficiency and accuracy of satellite broadcasting reception.
Implementation Method 1
A signal received by the antenna for receiving the satellite broadcasting is modulated to an intermediate frequency by a low noise block (LNB)
Data Source
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AI summary
A method for receiving satellite broadcasting includes: amplifying an inputted satellite broadcasting signal; converting the amplified signal to a baseband signal by mixing the amplified signal with a center frequency of a selected channel; and varying a channel bandwidth of the baseband signal.