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1.发明申请公开(公告)号：US20190245718A1
公开(公告)日：2019-08-08
申请号：US15889919
申请日：2018-02-06
IPC分类号： H04L25/03 , H04B7/0408
CPC分类号： H04L25/03057 , H04B7/0408 , H04L25/03038 , H04L25/03343 , H04L2025/03573
摘要： An interference mitigation apparatus, comprising: an adaptive feedforward filtering stage and an adaptive feedback filtering stage configured to produce a plurality of output signals from a plurality of frequency downconverted signals, the output signals for being provided to a data decoding stage; a plurality of phase rotators configured to apply phase rotation to the frequency downconverted signals prior to processing by the adaptive feedforward filtering stage and the adaptive feedback filtering stage; and an adaptive controller configured for varying an amount of the phase rotation applied by the phase rotators to the frequency downconverted signals based at least in part on symbol decisions made on the output signals. There may be second phase rotators configured to apply phase rotation after the adaptive feedforward filtering stage so as to produce the output signals for forwarding to the data decoding stage.
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公开(公告)号：US10135540B2
公开(公告)日：2018-11-20
申请号：US15485272
申请日：2017-04-12
IPC分类号： H04B10/516
摘要： Systems and methods are disclosed that attempt to increase spectral efficiency by using Faster-than-Nyquist (FTN) transmission. In one embodiment, a method at a transmitter includes partitioning bits into K bit streams, obtaining K power scaled symbol streams, combining the K power scaled symbol streams to obtain a stream of transmission symbols, and transmitting the stream of transmission symbols using FTN signaling. At the receiver, the received symbols are partitioned into K symbol streams, and demodulation and decoding is performed by: (i) demodulating and decoding the Kth symbol stream of the K symbol streams to obtain a Kth set of bits; (ii) mapping the Kth set of bits to a Kth set of symbols; and (iii) for each one of k=K−1, . . . , 1: demodulating and decoding a kth symbol stream of the K symbol streams to obtain a kth set of bits. The demodulating and decoding includes performing interference cancellation.
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公开(公告)号：US11271659B1
公开(公告)日：2022-03-08
申请号：US17001299
申请日：2020-08-24
申请人： Mrinmoy Jana , Jeebak Mitra , Lutz Hans-Joachim Lampe , Jin Wang , Zhuhong Zhang
发明人： Mrinmoy Jana , Jeebak Mitra , Lutz Hans-Joachim Lampe , Jin Wang , Zhuhong Zhang
摘要： A receiver architecture is described for phase noise compensation in the presence of inter-channel interference (ICI) and inter-symbol interference (ISI), particularly for time-frequency packing (TFP) transmissions. The receiver includes a coarse phase noise (PN) estimator, a PN compensation module, an ICI cancellation module, an ISI compensation module, a FEC decoder, and an iterative PN estimator. The iterative PN estimator receives log likelihood ratio (LLR) information from the decoder and provides an iterative PN estimation to the PN compensation module. The decoder also provides LLR to the ISI compensation module, and to at least one other receiver for another subchannel that is immediately adjacent in frequency. The ICI cancellation module receives decoder output from at least one adjacent subchannel, which the ICI cancellation module uses to provide a ICI-cancelled signal.
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公开(公告)号：US10003390B2
公开(公告)日：2018-06-19
申请号：US15341227
申请日：2016-11-02
IPC分类号： H04L25/49 , H04B7/0456 , H04B7/0417 , H04L25/03
CPC分类号： H04B7/0456 , H04B7/0413 , H04B7/0417 , H04B7/10 , H04L1/00 , H04L25/03343 , H04L25/03834 , H04L25/4975
摘要： Systems and methods of precoded faster than Nyquist (FTN) signalling are provided. In the transmitter, Tomlinson-Harashima Preceding (THP) is applied to produce precoded symbols. The THP is based on inter-symbol interference (ISI) due to using faster than Nyquist (FTN) signalling. An inverse modulo operation is not performed in the receiver. Instead, in the receiver, FTN processing is performed based on a matched filter output by determining log a-posteriori probability ratio LAPPR values computed for an nth bit bn of a kth received symbol and pre-computed a-priori probabilities of an extended constellation for a given pulse shape h(t) and FTN acceleration factor combination.
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公开(公告)号：US20170302383A1
公开(公告)日：2017-10-19
申请号：US15485272
申请日：2017-04-12
IPC分类号： H04B10/516
CPC分类号： H04B10/516
摘要： Systems and methods are disclosed that attempt to increase spectral efficiency by using Faster-than-Nyquist (FTN) transmission. In one embodiment, a method at a transmitter includes partitioning bits into K bit streams, obtaining K power scaled symbol streams, combining the K power scaled symbol streams to obtain a stream of transmission symbols, and transmitting the stream of transmission symbols using FTN signaling. At the receiver, the received symbols are partitioned into K symbol streams, and demodulation and decoding is performed by: (i) demodulating and decoding the Kth symbol stream of the K symbol streams to obtain a Kth set of bits; (ii) mapping the Kth set of bits to a Kth set of symbols; and (iii) for each one of k=K−1, . . . , 1: demodulating and decoding a kth symbol stream of the K symbol streams to obtain a kth set of bits. The demodulating and decoding includes performing interference cancellation.
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公开(公告)号：US20220060262A1
公开(公告)日：2022-02-24
申请号：US17001299
申请日：2020-08-24
申请人： Mrinmoy JANA , Jeebak MITRA , Lutz Hans-Joachim LAMPE , Jin WANG , Zhuhong ZHANG
发明人： Mrinmoy JANA , Jeebak MITRA , Lutz Hans-Joachim LAMPE , Jin WANG , Zhuhong ZHANG
摘要： A receiver architecture is described for phase noise compensation in the presence of inter-channel interference (ICI) and inter-symbol interference (ISI), particularly for time-frequency packing (TFP) transmissions. The receiver includes a coarse phase noise (PN) estimator, a PN compensation module, an ICI cancellation module, an ISI compensation module, a FEC decoder, and an iterative PN estimator. The iterative PN estimator receives log likelihood ratio (LLR) information from the decoder and provides an iterative PN estimation to the PN compensation module. The decoder also provides LLR to the ISI compensation module, and to at least one other receiver for another subchannel that is immediately adjacent in frequency. The ICI cancellation module receives decoder output from at least one adjacent subchannel, which the ICI cancellation module uses to provide a ICI-cancelled signal.
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公开(公告)号：US20170310373A1
公开(公告)日：2017-10-26
申请号：US15341227
申请日：2016-11-02
IPC分类号： H04B7/0456 , H04L25/03 , H04B7/0417
CPC分类号： H04B7/0456 , H04B7/0413 , H04B7/0417 , H04B7/10 , H04L25/03343 , H04L25/03834 , H04L25/4975
摘要： Systems and methods of precoded faster than Nyquist (FTN) signalling are provided. In the transmitter, Tomlinson-Harashima Preceding (THP) is applied to produce precoded symbols. The THP is based on inter-symbol interference (ISI) due to using faster than Nyquist (FTN) signalling. An inverse modulo operation is not performed in the receiver. Instead, in the receiver, FTN processing is performed based on a matched filter output by determining log a-posteriori probability ratio LAPPR values computed for an nth bit bn of a kth received symbol and pre-computed a-priori probabilities of an extended constellation for a given pulse shape h(t) and FTN acceleration factor combination.
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公开(公告)号：US10425256B2
公开(公告)日：2019-09-24
申请号：US15889919
申请日：2018-02-06
IPC分类号： H04L25/03 , H04B7/0408
摘要： An interference mitigation apparatus, comprising: an adaptive feedforward filtering stage and an adaptive feedback filtering stage configured to produce a plurality of output signals from a plurality of frequency downconverted signals, the output signals for being provided to a data decoding stage; a plurality of phase rotators configured to apply phase rotation to the frequency downconverted signals prior to processing by the adaptive feedforward filtering stage and the adaptive feedback filtering stage; and an adaptive controller configured for varying an amount of the phase rotation applied by the phase rotators to the frequency downconverted signals based at least in part on symbol decisions made on the output signals. There may be second phase rotators configured to apply phase rotation after the adaptive feedforward filtering stage so as to produce the output signals for forwarding to the data decoding stage.
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