Monobit Receiver Feedback Control for Harmonics Suppression
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Solution Overview
Problem
Monobit receivers generate high levels of unwanted signal frequency harmonics, which obscure desired signals, and existing methods to mitigate this, such as flooding with broad-spectrum noise, degrade receiver sensitivity.
Innovation Solution
A method that monitors the power ratio between a signal's fundamental frequency and its harmonics, using a feedback loop to control the input channel conditioner, balancing harmonics rejection and signal-to-noise ratio (SNR) by dynamically adjusting attenuation or noise addition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If broad-spectrum noise is added to the channel to suppress unwanted harmonics, then harmonics rejection is improved, but receiver sensitivity deteriorates
Solution Approach 1:
The patent implements a feedback control system that continuously monitors the power ratio between fundamental frequency and harmonic components of the received signal. Based on this monitoring, the system dynamically adjusts the amount of broad-spectrum noise added to the channel, thereby suppressing unwanted harmonics while maintaining optimal receiver sensitivity through closed-loop control
Solution Approach 2:
The system transitions from static noise addition to dynamic noise injection by continuously adapting the noise level based on real-time signal characteristics. The channel conditioning parameter (noise amount) is dynamically adjusted according to the monitored power ratio, allowing the system to optimize harmonics rejection and sensitivity under varying operating conditions
2Object-generated harmful factors
If channel attenuation is increased to reduce unwanted harmonics, then harmonics rejection is improved, but signal-to-noise ratio deteriorates
Solution Approach 1:
The feedback control mechanism monitors the power ratio between fundamental and harmonic frequencies and dynamically adjusts the attenuation level. This ensures that attenuation is applied only to the extent necessary for harmonics suppression, maintaining optimal signal-to-noise ratio through continuous optimization
Solution Approach 2:
The system dynamically changes the channel conditioning parameter (attenuation level) based on the monitored signal characteristics. By adjusting the attenuation parameter in real-time according to the power ratio feedback, the system optimizes the balance between harmonics rejection and signal-to-noise ratio
Data Source
AI summary
A method for minimizing unwanted signal harmonics from at least one signal in a channel received through a monobit receiver, comprising: conditioning (312) the channel, determining (318, 320) relative strength between two frequency components of a signal within the channel, and using that relative strength (322) to control (324) how the channel is conditioned. In other embodiments, a system for receiving signals in a channel and minimizing unwanted harmonics from those signals has a monobit receiver (104, 204), a channel conditioner (124, 228, 230), and a feedback driver (114, 118, 208, 216, 218, 224) determining relative strength (116, 122, 220, 222, 226) between two frequency components of a received signal and using that determination to control the channel conditioner in a way that urges the relative strength toward a desired value.