Patents by Inventor Nikola Alic
Nikola Alic has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20230291629Abstract: The present disclosure provides techniques for bandwidth constrained communication systems with frequency domain information processing. A bandwidth constrained equalized transport (BCET) communication system can include a transmitter, a communication channel, and a receiver. The transmitter can include a pulse-shaping filter that intentionally introduces memory into a signal in the form of inter-symbol interference, an error control code (ECC) encoder, a multidimensional fast Fourier transform (FFT) processing block that processes the signal in the frequency domain, and a first interleaver. The receiver can include an information-retrieving equalizer, a deinterleaver with an ECC decoder, and a second interleaver joined in an iterative ECC decoding loop.Type: ApplicationFiled: May 12, 2023Publication date: September 14, 2023Applicant: NTWINE, LLCInventors: Andreja Radosevic, Srdjan Brkic, Djordje Sarac, Nikola Alic
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Patent number: 11695610Abstract: The present disclosure provides techniques for bandwidth constrained communication systems with frequency domain information processing. A bandwidth constrained equalized transport (BCET) communication system can include a transmitter, a communication channel, and a receiver. The transmitter can include a pulse-shaping filter that intentionally introduces memory into a signal in the form of inter-symbol interference, an error control code (ECC) encoder, a multidimensional fast Fourier transform (FFT) processing block that processes the signal in the frequency domain, and a first interleaver. The receiver can include an information-retrieving equalizer, a deinterleaver with an ECC decoder, and a second interleaver joined in an iterative ECC decoding loop. The communication system can be bandwidth constrained, and the signal can comprise an information rate that is higher than that of a communication system without intentional introduction of the memory at the transmitter.Type: GrantFiled: January 7, 2022Date of Patent: July 4, 2023Assignee: NTWINE, LLCInventors: Andreja Radosevic, Srdjan Brkic, Djordje Sarac, Nikola Alic
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Patent number: 11632191Abstract: The present application is directed to techniques and systems for extension of unrepeatered submarine fiber links to provide an increase in reach of unrepeatered fiber transmission. Both single channel unrepeatered systems and multiple channel unrepeatered systems can be used. The multiple channel unrepeatered systems can further employ nonlinearity compensation. The present application is also directed to methods of signal transmission using the unrepeatered systems.Type: GrantFiled: July 30, 2021Date of Patent: April 18, 2023Assignee: Raytheon CompanyInventors: Nikola Alic, Vanessa Lynn Karr
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Patent number: 11418260Abstract: A system and method for mitigating nonlinearity in an optical communication link with multiple carriers uses mutual frequency referencing to stabilize at least a portion of the multiple carriers. Using at least one frequency-referenced signal, carrier nonlinearity can be determined and compensated within the link by pre-distortion, back-propagation, or a combination of both. Mutual frequency referencing may be performed at the emitting end of the link, at the receiving end, or a combination of both.Type: GrantFiled: November 4, 2020Date of Patent: August 16, 2022Assignee: The Regents of the University of CaliforniaInventors: Nikola Alic, Stojan Radic
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Publication number: 20220224361Abstract: The technology relates to bandwidth constrained communication systems with neural network based detection. In some embodiments, a bandwidth constrained equalized transport (BCET) communication system comprises: a transmitter comprising an error control code encoder, a pulse-shaping filter, and a first interleaver; a communication channel; and a receiver comprising a neural network processing block that processes a received signal. The error control code encoder can append redundant information onto the signal. The pulse-shaping filter can intentionally introduce memory into the signal in the form of inter-symbol interference. The first interleaver can change a temporal order of the symbols in the signal. The error control code encoder can be a low-density parity-check (LDPC) error control code encoder. The neural network can be trained with positive mappings between transmitted and decoded training signals, or negative mappings between training signals and a null space of an LDPC generation matrix.Type: ApplicationFiled: January 7, 2022Publication date: July 14, 2022Applicant: NTWINE, LLCInventors: Nikola Alic, Andreja Radosevic
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Publication number: 20220131734Abstract: The present disclosure provides techniques for bandwidth constrained communication systems with frequency domain information processing. A bandwidth constrained equalized transport (BCET) communication system can include a transmitter, a communication channel, and a receiver. The transmitter can include a pulse-shaping filter that intentionally introduces memory into a signal in the form of inter-symbol interference, an error control code (ECC) encoder, a multidimensional fast Fourier transform (FFT) processing block that processes the signal in the frequency domain, and a first interleaver. The receiver can include an information-retrieving equalizer, a deinterleaver with an ECC decoder, and a second interleaver joined in an iterative ECC decoding loop. The communication system can be bandwidth constrained, and the signal can comprise an information rate that is higher than that of a communication system without intentional introduction of the memory at the transmitter.Type: ApplicationFiled: January 7, 2022Publication date: April 28, 2022Applicant: NTWINE, LLCInventors: Andreja Radosevic, Srdjan Brkic, Djordje Sarac, Nikola Alic
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Patent number: 11271673Abstract: In some embodiments, a bandwidth constrained equalized transport (BCET) communication system comprises a transmitter that transmits a signal, a communication channel that transports the signal, and a receiver that receives the signal. The transmitter can comprise a pulse-shaping filter that intentionally introduces memory into the signal, and an error control code encoder that is a low-density parity-check (LDPC) error control code encoder. The error control encoder comprises code that is optimized based on the intentionally introduced memory into the signal, a code rate, a signal-to-noise ratio, and an equalizer structure in the receiver. In some embodiments, the communication system is bandwidth constrained, and the transmitted signal comprises an information rate that is higher than for an equivalent system without intentional introduction of the memory at the transmitter.Type: GrantFiled: July 13, 2020Date of Patent: March 8, 2022Assignee: NTWINE, LLCInventors: Andreja Radosevic, Predrag Ivanis, Srdjan Brkic, Djordje Sarac, Nikola Alic
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Patent number: 11240083Abstract: The present disclosure provides techniques for bandwidth constrained communication systems with frequency domain information processing. A bandwidth constrained equalized transport (BCET) communication system can include a transmitter, a communication channel, and a receiver. The transmitter can include a pulse-shaping filter that intentionally introduces memory into a signal in the form of inter-symbol interference, an error control code (ECC) encoder, a multidimensional fast Fourier transform (FFT) processing block and a multidimensional inverse FFT processing block that process the signal in the frequency domain, and a first interleaver. The receiver can include an information-retrieving equalizer, a deinterleaver with an ECC decoder, and a second interleaver joined in an iterative ECC decoding loop.Type: GrantFiled: March 9, 2021Date of Patent: February 1, 2022Assignee: NTWINE, LLCInventors: Andreja Radosevic, Srdjan Brkic, Djordje Sarac, Nikola Alic
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Publication number: 20210359783Abstract: The present application is directed to techniques and systems for extension of unrepeatered submarine fiber links to provide an increase in reach of unrepeatered fiber transmission. Both single channel unrepeatered systems and multiple channel unrepeatered systems can be used. The multiple channel unrepeatered systems can further employ nonlinearity compensation. The present application is also directed to methods of signal transmission using the unrepeatered systems.Type: ApplicationFiled: July 30, 2021Publication date: November 18, 2021Inventors: Nikola ALIC, Vanessa Lynn KARR
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Patent number: 11153015Abstract: A spread spectrum receiving method receives a spread spectrum signal. An optical signal frequency comb is generated. Modes of the optical signal frequency comb are modulated with a received spread spectrum signal. An optical local oscillator comb is generated that is mutually coherent with the signal frequency comb. A code word is applied to the local oscillator comb. The combs are combined and the received spread spectrum signal is detected from the combined combs.Type: GrantFiled: July 27, 2020Date of Patent: October 19, 2021Assignee: The Regents of the Unversilty of CaliforniaInventors: Daniel Esman, Vahid Ataie, Ping P. Kuo, Nikola Alic, Stojan Radic
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Publication number: 20210288859Abstract: The present disclosure provides techniques for bandwidth constrained communication systems with frequency domain information processing. A bandwidth constrained equalized transport (BCET) communication system can include a transmitter, a communication channel, and a receiver. The transmitter can include a pulse-shaping filter that intentionally introduces memory into a signal in the form of inter-symbol interference, an error control code (ECC) encoder, a multidimensional fast Fourier transform (FFT) processing block and a multidimensional inverse FFT processing block that process the signal in the frequency domain, and a first interleaver. The receiver can include an information-retrieving equalizer, a deinterleaver with an ECC decoder, and a second interleaver joined in an iterative ECC decoding loop.Type: ApplicationFiled: March 9, 2021Publication date: September 16, 2021Applicant: NTWINE, LLCInventors: Andreja Radosevic, Srdjan Brkic, Djordje Sarac, Nikola Alic
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Patent number: 11095395Abstract: The present invention is directed to techniques and systems for extension of unrepeatered submarine fiber links to provide an increase in reach of unrepeatered fiber transmission. Both single channel unrepeatered systems and multiple channel unrepeatered systems can be used. The multiple channel unrepeatered systems can further employ nonlinearity compensation. The present invention is also directed to methods of signal transmission using the unrepeatered systems.Type: GrantFiled: October 18, 2019Date of Patent: August 17, 2021Inventors: Nikola Alic, Vanessa Lynn Karr
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Publication number: 20210050919Abstract: A system and method for mitigating nonlinearity in an optical communication link with multiple carriers uses mutual frequency referencing to stabilize at least a portion of the multiple carriers. Using at least one frequency-referenced signal, carrier nonlinearity can be determined and compensated within the link by pre-distortion, back-propagation, or a combination of both. Mutual frequency referencing may be performed at the emitting end of the link, at the receiving end, or a combination of both.Type: ApplicationFiled: November 4, 2020Publication date: February 18, 2021Inventors: Nikola ALIC, Stojan RADIC
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Publication number: 20200358535Abstract: A spread spectrum receiving method receives a spread spectrum signal. An optical signal frequency comb is generated. Modes of the optical signal frequency comb are modulated with a received spread spectrum signal. An optical local oscillator comb is generated that is mutually coherent with the signal frequency comb. A code word is applied to the local oscillator comb. The combs are combined and the received spread spectrum signal is detected from the combined combs.Type: ApplicationFiled: July 27, 2020Publication date: November 12, 2020Inventors: Daniel ESMAN, Vahid ATAIE, Ping P. KUO, Nikola ALIC, Stojan RADIC
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Publication number: 20200343997Abstract: In some embodiments, a bandwidth constrained equalized transport (BCET) communication system comprises a transmitter that transmits a signal, a communication channel that transports the signal, and a receiver that receives the signal. The transmitter can comprise a pulse-shaping filter that intentionally introduces memory into the signal, and an error control code encoder that is a low-density parity-check (LDPC) error control code encoder. The error control encoder comprises code that is optimized based on the intentionally introduced memory into the signal, a code rate, a signal-to-noise ratio, and an equalizer structure in the receiver. In some embodiments, the communication system is bandwidth constrained, and the transmitted signal comprises an information rate that is higher than for an equivalent system without intentional introduction of the memory at the transmitter.Type: ApplicationFiled: July 13, 2020Publication date: October 29, 2020Applicant: NTWINE, LLCInventors: Andreja Radosevic, Predrag Ivanis, Srdjan Brkic, Djordje Sarac, Nikola Alic
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Patent number: 10763971Abstract: A spread spectrum receiver and receiving methods are provided. Received data is physically reconstructed in the optical domain using a pair of coherently coupled frequency combs, one modulated by the received signal and one modulated by the code word, and then detecting the received data with a subrate detector comprised of detector array. Particular methods and receivers extract a timing difference between the received spread spectrum signal and the codeword from the phase shifts of Fourier terms of the product of the received spread spectrum signal and the codeword that can be measured from the combined combs.Type: GrantFiled: February 24, 2017Date of Patent: September 1, 2020Assignee: The Regents of the University of CaliforniaInventors: Daniel Esman, Vahid Ataie, Ping P. Kuo, Nikola Alic, Stojan Radic
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Patent number: 10715276Abstract: In some embodiments, a bandwidth constrained equalized transport (BCET) communication system comprises a transmitter that transmits a signal, a communication channel that transports the signal, and a receiver that receives the signal. The transmitter can comprise a pulse-shaping filter that intentionally introduces memory into the signal, and an error control code encoder that is a low-density parity-check (LDPC) error control code encoder. The error control encoder comprises code that is optimized based on the intentionally introduced memory into the signal, a code rate, a signal-to-noise ratio, and an equalizer structure in the receiver. In some embodiments, the communication system is bandwidth constrained, and the transmitted signal comprises an information rate that is higher than for an equivalent system without intentional introduction of the memory at the transmitter.Type: GrantFiled: May 21, 2019Date of Patent: July 14, 2020Assignee: NTWINE, LLCInventors: Andreja Radosevic, Predrag Ivanis, Srdjan Brkic, Djordje Sarac, Nikola Alic
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Publication number: 20200119833Abstract: The present invention is directed to techniques and systems for extension of unrepeatered submarine fiber links to provide an increase in reach of unrepeatered fiber transmission. Both single channel unrepeatered systems and multiple channel unrepeatered systems can be used. The multiple channel unrepeatered systems can further employ nonlinearity compensation. The present invention is also directed to methods of signal transmission using the unrepeatered systems.Type: ApplicationFiled: October 18, 2019Publication date: April 16, 2020Inventors: Nikola ALIC, Vanessa Lynn KARR
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Patent number: 10523329Abstract: A photonically-assisted cyclostationary analyzer eliminates the need for high-bandwidth digitization and real-time Fourier processors by using mutually-coherent frequency combs to generate a Fourier representation of the received signal in a computation-free manner.Type: GrantFiled: November 7, 2017Date of Patent: December 31, 2019Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Daniel Esman, Vahid Ataie, Ping Piu Kuo, Nikola Alic, Stojan Radic
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Publication number: 20190363825Abstract: In some embodiments, a bandwidth constrained equalized transport (BCET) communication system comprises a transmitter that transmits a signal, a communication channel that transports the signal, and a receiver that receives the signal. The transmitter can comprise a pulse-shaping filter that intentionally introduces memory into the signal, and an error control code encoder that is a low-density parity-check (LDPC) error control code encoder. The error control encoder comprises code that is optimized based on the intentionally introduced memory into the signal, a code rate, a signal-to-noise ratio, and an equalizer structure in the receiver. In some embodiments, the communication system is bandwidth constrained, and the transmitted signal comprises an information rate that is higher than for an equivalent system without intentional introduction of the memory at the transmitter.Type: ApplicationFiled: May 21, 2019Publication date: November 28, 2019Applicant: SANS R&D, LLCInventors: Andreja Radosevic, Predrag Ivanis, Srdjan Brkic, Djordje Sarac, Nikola Alic