Boosted Noncoherent Modulation for SNR Enhancement
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Solution Overview
Problem
Wireless communication systems face challenges in reducing the impact of amplified noise on signal-to-noise ratio (SNR) in noncoherent modulation schemes like differential phase shift keying (DPSK), particularly in low SNR conditions, which degrades signaling performance.
Innovation Solution
The implementation of boosted noncoherent modulation by applying a boosting factor to signals during mapping to time and frequency resources, using a resource element mapper to distribute the boosting factor across subcarriers, and incorporating silent subcarriers to maintain total energy, thereby enhancing the SNR and reducing noise coherence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If noncoherent modulation schemes like DPSK are used, then ease of operation is improved, but signal-to-noise ratio deteriorates due to amplified noise
Solution Approach 1:
The patent applies a boosting factor to the modulated signal in the frequency domain, changing the amplitude parameter of the signal to increase SNR. The boosting factor is applied as: boosted_signal = scaling_factor × modulated_signal, where the scaling factor compensates for noise amplification effects in noncoherent modulation schemes
2Reliability
If signal boosting is applied to increase SNR, then reliability is improved, but energy consumption increases
Solution Approach 1:
The patent applies partial boosting by using a boosting factor that is greater than 1 but not excessively large. The boosting factor is designed to provide sufficient SNR improvement while avoiding excessive energy consumption. The factor is applied selectively to maintain the balance between reliability and energy efficiency
3Reliability
If silent subcarriers are added to maintain total energy, then signal-to-noise ratio is improved, but spectral efficiency deteriorates
Solution Approach 1:
The patent segments the frequency resources into active subcarriers carrying data and silent subcarriers used for boosting. This segmentation allows the system to maintain total energy while improving SNR on active subcarriers. The silent subcarriers are strategically placed and their number is optimized to balance SNR improvement with spectral efficiency
Data Source
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Figure 3A~3B
AI summary
Methods, systems, and devices for wireless communications are described. A transmitting device may encode a set of data bits on a set of sub carriers based on a boosting factor, and map the set of encoded data bits to a resource block including a first subset of subcarriers corresponding to the set of encoded data bits and a second subset of sub carriers corresponding to a set of null bits. The transmitting device may generate and transmit a signal including the set of encoded data bits. A receiving device may receive a modulated signal on a set of sub carriers, and de-map the modulated signal to a first subset of subcarriers and a second subset of subcarriers based on a boosting factor. The receiving device may decode the first subset of sub carriers to a first set of data bits and the second subset of sub carriers to a second set of data bits.