公开(公告)号：US11706002B2

公开(公告)日：2023-07-18

申请号：US17064098

申请日：2020-10-06

申请人： Nuwan Suresh Ferdinand ,  Ming Jia ,  Jianglei Ma ,  Javad Abdoli

发明人： Nuwan Suresh Ferdinand ,  Ming Jia ,  Jianglei Ma ,  Javad Abdoli

IPC分类号： H04L5/00 ,  H04L27/10 ,  H04L25/02

CPC分类号： H04L5/0048 ,  H04L25/0202 ,  H04L27/10

摘要： A reference signaling scheme is provided that is based on the use of a Zadoff Chu sequence with cyclic repetition, optionally code division multiplexing precoding, together with frequency domain spectral shaping (FDSS). A specific pulse shape design for the FDSS part of the reference signal scheme in some embodiments involves the use of a raised cosine pulse raised to the power of β. The new solution for generating reference signals has a Low peak average power ratio that matches the PAPR of SC-OQAM, good channel estimation performance, and the ability to implement CDM in the frequency domain to increase multiplexing gain.

公开(公告)号：US11177995B2

公开(公告)日：2021-11-16

申请号：US16782453

申请日：2020-02-05

申请人： Nuwan Suresh Ferdinand ,  Ming Jia ,  Jianglei Ma

发明人： Nuwan Suresh Ferdinand ,  Ming Jia ,  Jianglei Ma

IPC分类号： H04L27/36 ,  H04L27/26

摘要： Aspects of the present application provide methods and devices for time domain implementation of a single carrier waveform such as single carrier quadrature amplitude modulation (QAM) DFT-s-OFDM and single carrier Offset QAM (OQAM). A time domain implementation allows flexible symbol lengths, lower implementation complexity as a large IDFT operation is not required in the time domain and support for variable cyclic prefix (CP) length. An OQAM implementation utilizes a pre-processing step to convert a K complex QAM symbol sequence into a 2K OQAM symbol sequence and generates a sequence for transmission in the time domain as opposed to the frequency domain.

公开(公告)号：US11108607B2

公开(公告)日：2021-08-31

申请号：US16585553

申请日：2019-09-27

申请人： Nuwan Suresh Ferdinand ,  Ming Jia ,  Jianglei Ma

发明人： Nuwan Suresh Ferdinand ,  Ming Jia ,  Jianglei Ma

IPC分类号： H04L27/26 ,  H04L25/03

摘要： A system and method are provided for processing symbols for transmission. A set of 2K outputs is produced that includes K real components and K imaginary components from K complex symbols. A Fourier transform operation on the 2K outputs produces 2K Fourier transform outputs. Transmit pulse shaping is applied to the 2K Fourier transform outputs. The transmit pulse shape may be Nyquist or non-Nyquist. An inverse Fourier transform operation on the J pulse shaped outputs produces an inverse Fourier transform output. In the receiver, equalization is performed to remove the effect of both the channel and the transmit pulse shape. Nyquist pulse shaping is performed by applying a Nyquist pulse shape prior to converting back to time domain. The approach avoids self-interference, even in situations where the transmit pulse shape is non-Nyquist. The transmitter is free to select a pulse shape to optimize PAPR without being concerned with interference.

公开(公告)号：US10931493B1

公开(公告)日：2021-02-23

申请号：US16567122

申请日：2019-09-11

申请人： Nuwan Suresh Ferdinand ,  Ming Jia

发明人： Nuwan Suresh Ferdinand ,  Ming Jia

IPC分类号： H04L27/26 ,  H04L5/00 ,  H04L27/34

摘要： A system and method are provided for processing symbols for transmission. The method involves producing a set of 2K outputs that include K real components and K imaginary components from K complex symbols, performing a Fourier transform operation on the 2K outputs to produce 2K Fourier transform outputs, pulse shaping the 2K Fourier transform outputs by multiplying each of J of the 2K Fourier transform outputs with a respective one of J non-zero coefficients, where J is odd, and K≤J≤2K−1, performing an inverse Fourier transform operation on the J pulse shaped outputs to produce an inverse Fourier transform output; and outputting the inverse Fourier transform output. The approach has the advantage of avoiding self-interference, with the result that better BLER performance may be possible. The approach is applicable to any modulation order without bandwidth expansion. Flexibility is provided through a trade-off between PAPR vs. spectrum efficiency.

公开(公告)号：US11502890B2

公开(公告)日：2022-11-15

申请号：US17181047

申请日：2021-02-22

申请人： Nuwan Suresh Ferdinand ,  Ming Jia

发明人： Nuwan Suresh Ferdinand ,  Ming Jia

IPC分类号： H04L27/26 ,  H04L5/00 ,  H04L27/34

摘要： A system and method are provided for processing symbols for transmission. The method involves producing a single carrier offset quadrature amplitude modulation (OQAM) waveform signal from a set of K complex symbols. The method further involves pulse shaping 2K frequency domain samples of the OQAM waveform signal with J non-zero coefficients, where the J non-zero coefficients represent a frequency response of a conjugate symmetrical pulse shape, and K≤J≤2K−1. The approach has the advantage of avoiding self-interference, with the result that better BLER performance may be possible. The approach is applicable to any modulation order and also avoids bandwidth expansion. Flexibility is provided through a trade-off between PAPR vs. spectrum efficiency.