Optimized Signal Power for Clearer Communication
Introduction
In telecommunications, optimizing signal clarity while reducing interference is essential, especially as the demand for high-speed data transmission grows. This patent provides a specialized method for reducing the peak-to-average power ratio (PAPR) in Orthogonal Frequency Division Multiplexing (OFDM) signals, a critical technology for high-speed wireless networks. By offering reduced power spikes and more efficient transmission, this patent provides an edge for companies aiming to improve wireless communication performance and minimize power consumption in networks.
How It Works
The technology leverages advanced algorithms to manage and reduce PAPR in OFDM signals. By actively reducing peaks that cause power inefficiencies and distortion, it creates a smoother signal flow with lower energy demands. This optimized power flow decreases signal loss and interference, resulting in a clearer and more reliable connection. The system is adaptable to a range of wireless devices, making it ideal for integration into various communication systems, from mobile devices to industrial networks.
Key Benefits
- Enhanced Signal Quality: By optimizing power flow and reducing PAPR, this technology minimizes distortion and improves signal clarity, ensuring high-quality transmission across wireless networks.
- Increased Energy Efficiency: The system reduces power spikes and associated energy wastage, leading to lower operational costs and extended battery life for portable devices.
- Scalability Across Devices: The algorithm is adaptable, allowing seamless integration into a variety of communication devices, from smartphones to IoT systems, expanding the technology’s market applicability.
- Improved Network Performance: Lower PAPR contributes to better network stability and performance, making it a vital asset for providers aiming to deliver consistent, high-speed communication in data-heavy environments.
Why License This Technology
Licensing this PAPR reduction system positions your company as a leader in advanced signal processing solutions. This technology is not only valuable for improving current communication standards but is also highly adaptable for future advancements in wireless communication. By integrating this system, telecommunications companies, network operators, and device manufacturers can significantly enhance the efficiency, reliability, and energy savings of their products. This innovative approach to PAPR reduction ensures optimized signal power, a better user experience, and improved overall performance, making it a powerful asset for any technology-focused brand.
Systems and methods are provided for reducing peak-to-average power ratio (“PAPR”) in an orthogonal frequency division multiplexing (“OFDM”) signal having reference tones by introducing modified pilot tones to cancel peaks in OFDM symbols in the OFDM signal array. The modified pilot tones are added to the original OFDM signal, which in turn conditions the OFDM symbols of the signal to effectively reduce the PAPR. Such systems and methods provide PAPR reduction for OFDM signals generated by an OFDM Signal Processor through the addition of tone reservation PAPR reduction methods, which use reserved tones such as pilot tones to improve PAPR. Such methods offer an advantage of improving the PAPR without introducing distortion to the signal.
What is claimed is:
1. A method of reducing peak-to-average power ratio (“PAPR”) in OFDM signals, comprising the steps of:
receiving a digital information signal at a PAPR reduction module, said PAPR reduction module having a processor and a memory;
generating an original OFDM signal from said digital information signal having multiple OFDM symbols;
setting pilot tones in said original OFDM signal to zero;
generating a new OFDM symbol with the pilot tones zeroed out;
generating new pilot tones and adding each said new pilot tone to said new OFDM symbol to produce multiple new OFDM symbols having new pilot tones;
identifying one of said multiple new OFDM symbols having new pilot tones as having a greatest improvement in PAPR in comparison to said original signal; and
transmitting said identified one of said new OFDM symbols having new pilot tones in an OFDM signal from a transmitter in communication with said PAPR module.
2. The method of claim 1, wherein said steps of generating new pilot tones and adding each said new pilot tone to OFDM symbol further comprises the steps of iteratively:
(i) generating new pilot tones from each one of multiple possible combinations of pilot tones of the original OFDM signal;
(ii) adding each said new pilot tone to said new OFDM symbol to generate an associated reduced-PAPR OFDM symbol;
(iii) storing said associated reduced-PAPR OFDM symbol in memory; and
(iv) repeating steps (i)-(iii) for each of said multiple possible combinations of pilot tones of the original OFDM signal with pilot tones set to zero.
3. The computer method of claim 2, further comprising the steps of:
comparing a plurality of iteratively generated reduced-PAPR OFDM symbols;
wherein said step of identifying said one of said new OFDM symbols having new pilot tones as having a greatest improvement in PAPR is carried out based on said comparing step.
4. A method for reducing peak-to-average power ratio (“PAPR”) in OFDM signals, comprising the steps of:
receiving a digital information signal at a PAPR reduction module, said PAPR reduction module having a processor and a memory;
generating an original OFDM signal from said digital information signal having multiple OFDM symbols;
setting pilot tones in said original OFDM signal to zero;
generating a new OFDM symbol with the pilot tones zeroed out;
removing all samples in said new OFDM symbol having a value less than a multiple of a mean of an absolute value of said samples to form a center clipped signal;
performing FFT on the center clipped signal to generate a frequency domain signal;
selecting, from said frequency domain signal, replacement tones corresponding to said pilot tones that have been zeroed out;
generating revised pilot tones equal to the negative value of the selected replacement tones and adding said revised pilot tones to said frequency domain signal at a location at which said pilot tones had been zeroed out; and
generating a reduced-PAPR OFDM symbol comprising a combination of said revised pilot tones and said pilot tones in said original OFDM signal.
5. A system for reducing peak-to-average power ratio (“PAPR”) in OFDM signals, comprising:
an OFDM signal generator;
an OFDM signal transmitter in communication with said OFDM signal generator; and
a PAPR reduction module in communication with said OFDM generator and said OFDM signal transmitter, said PAPR reduction module having a processor and memory storing computer instructions thereon configured for execution by the processor to:
receive an original OFDM signal from said OFDM signal generator, said original OFDM signal having multiple OFDM symbols;
set pilot tones in said original OFDM signal to zero;
generate a new OFDM symbol with the pilot tones zeroed out;
generate new pilot tones and add each said new pilot tone to said new OFDM symbol to produce multiple new OFDM symbols having new pilot tones;
identify one of said multiple new OFDM symbols having new pilot tones as having a greatest improvement in PAPR in comparison to said original OFDM signal; and
transmit said identified one of said new OFDM symbols having new pilot tones in an OFDM signal from said OFDM signal transmitter.
6. The system of claim 5, wherein said computer instructions configured for execution by the processor to generate new pilot tones and add each said new pilot tone to said new OFDM symbol are further configured to iteratively:
(i) generate new pilot tones from each one of multiple possible combinations of pilot tones of the original OFDM signal;
(ii) add each said new pilot tone to said new OFDM symbol to generate an associated reduced-PAPR OFDM symbol;
(iii) store said associated reduced-PAPR OFDM symbol in said memory; and
(iv) repeat instructions (i)-(iii) for each of said multiple possible combinations of pilot tones of the original OFDM signal with pilot tones set to zero.
7. The system of claim 6, said computer instructions being further configured for execution by the processor to:
compare a plurality of iteratively generated reduced-PAPR OFDM symbols;
wherein said computer instructions configured to identify said one of said new OFDM symbols having new pilot tones as having a greatest improvement in PAPR is carried out based on said comparing step.
8. A system for reducing peak-to-average power ratio (“PAPR”) in OFDM signals, comprising:
an OFDM signal generator;
an OFDM signal transmitter in communication with said OFDM signal generator; and
a PAPR reduction module in communication with said OFDM generator and said OFDM signal transmitter, said PAPR reduction module having a processor and memory storing computer instructions thereon configured for execution by the processor to:
receive a digital information signal at the PAPR reduction module;
generate an original OFDM signal from said digital information signal having multiple OFDM symbols;
set pilot tones in said original OFDM signal to zero;
generate a new OFDM symbol with the pilot tones zeroed out;
remove all samples in said new OFDM symbol having a value less than a multiple of a mean of an absolute value of said samples to form a center clipped signal;
perform FFT on the center clipped signal to generate a frequency domain signal;
select, from said frequency domain signal, replacement tones corresponding to said pilot tones that have been zeroed out;
generate revised pilot tones equal to the negative value of the selected replacement tones and add said revised pilot tones to said frequency domain signal at a location at which said pilot tones had been zeroed out; and
generate a reduced-PAPR OFDM symbol comprising a combination of said revised pilot tones and said pilot tones in said original OFDM signal.
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Title
Systems and methods for peak-to-average power ratio (PAPR) reduction in OFDM signals
Inventor(s)
Richard Dean
Assignee(s)
Morgan State University
Patent #
11824700
Patent Date
November 21, 2023