Dynamic Spectral Mask Selection for Transmitter Interference Control
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Solution Overview
Problem
Existing spectral masks for transmitters do not optimize performance characteristics, particularly in avoiding interference and out-of-band emissions near defined frequencies, leading to suboptimal signal transmission.
Innovation Solution
A method and system where a transmitting device maintains multiple spectral masks, selects the appropriate mask based on the proximity of the transmission channel to a defined frequency, and configures the signal transmission to adhere to these masks, ensuring compliance with standards by attenuating power beyond the channel width to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single spectral mask is used for signal transmission, then the transmitter structure is simple, but the transmission performance is suboptimal and cannot avoid interference near defined frequencies
Solution Approach 1:
The patent implements dynamic spectral mask selection by maintaining multiple spectral masks (first spectral mask for channels far from defined frequency, second spectral mask for channels near defined frequency) and dynamically selecting the appropriate mask based on the proximity of the transmission channel to the defined frequency. This dynamic adaptation resolves the contradiction by allowing the system to optimize transmission performance for each specific channel condition while managing complexity through conditional selection logic.
Solution Approach 2:
The patent changes the spectral mask parameters (power spectral density limits, roll-off characteristics) based on the transmission channel's proximity to defined frequencies. By maintaining different spectral mask configurations and selecting them conditionally, the system adapts transmission parameters to match channel conditions, thereby improving reliability without permanently increasing device complexity.
2Object-generated harmful factors
If spectral mask is applied to eliminate cross-talk and interference, then channel interference is reduced, but out-of-band emissions are not optimally controlled near defined frequencies
Solution Approach 1:
The patent applies different spectral mask characteristics to different frequency regions. The second spectral mask is specifically designed with steeper roll-off characteristics for channels near defined frequencies to better control out-of-band emissions in that local region, while the first spectral mask is used for channels where such strict control is not needed, thereby maintaining transmission efficiency.
3Reliability
If transmission power is increased to improve signal quality, then signal quality improves, but out-of-band emissions increase and interfere with adjacent channels
Solution Approach 1:
The patent changes the spectral mask parameters (maximum power spectral density, roll-off slope) based on the transmission channel's proximity to defined frequencies. For channels near defined frequencies, the second spectral mask with stricter limits is applied, allowing the system to maintain signal quality while controlling out-of-band emissions. For channels far from defined frequencies, the first spectral mask with more relaxed parameters is used, allowing higher transmission power for improved signal quality.
Data Source
AI summary
Systems and methods for configuring a spectral mask include a transmitting device which maintains a plurality of spectral masks for signal transmissions. The transmitting device determines a channel to transmit a signal. The transmitting device selects a first spectral mask from the plurality of spectral masks according to the determined channel to transmit the signal. The transmitting device transmits the signal in the determined channel to a receiving device according to the first spectral mask.