公开(公告)号：US10523474B1

公开(公告)日：2019-12-31

申请号：US16006989

申请日：2018-06-13

Applicant: NXP B.V.

Inventor： Yunus Can Gultekin ,  Wim van Houtum ,  Frans M. J. Willems ,  Semih Serbetli

IPC: H04B1/10 ,  H04L25/03 ,  H04L27/04 ,  H04W52/02

Abstract: Certain aspects of the disclosure are directed to a method for communicating data from a transmitting circuit to a receiving circuit over a noisy channel. The method can be performed by logic circuitry, and can include encoding data, for transmission over the noisy channel. The data can be encoded, as a shaped-coded modulation signal by shaping the signal based on an amplitude selection algorithm that leads to a symmetrical input and by constructing a trellis having a bounded-energy sequence of amplitude values selected by computing and storing a plurality of channel-related energy constraints based on use of a nonlinear-estimation process, and therein providing an index for the bounded-energy sequence of amplitudes. The method can also include receiving over the noisy channel, the shaped-coded modulation signal, and decoding the data from the shaped-coded modulation signal by using the index to reconstruct the bounded-energy sequence of amplitudes.

公开(公告)号：US11867827B2

公开(公告)日：2024-01-09

申请号：US16402932

申请日：2019-05-03

Applicant: NXP B.V.

Inventor： Francesco Laghezza ,  Julian Renner ,  Frans M. J. Willems ,  Semih Serbetli ,  Alex Alvarado

IPC: G01S7/00 ,  G01S13/28

CPC classification number: G01S7/006 ,  G01S13/288

Abstract: Aspects of the present disclosure are directed to radar apparatuses and methods involving the communication of data with radar signals. As may be implemented with one or more embodiments, a sequence of radar waveforms are transmitted as RF signals, the RF signals carrying communication data encoded onto a ramped radar carrier signal via phase-shift keying (PSK) modulation. Such modulation may utilize a modified, reduced-angle modulation with phase angles of less than π. Object-reflected versions of the RF signals are received and demodulated by deramping the received object-reflected versions of RF signals using a linearized version of the radar waveforms (e.g., without PSK modulation). This approach can mitigate compression peak loss.

公开(公告)号：US10523480B1

公开(公告)日：2019-12-31

申请号：US16184370

申请日：2018-11-08

Applicant: NXP B.V.

Inventor： Yunus Can Gultekin ,  Frans M. J. Willems ,  Wim van Houtum ,  Semih Serbetli

IPC: H04L27/00 ,  H04L27/02

Abstract: A method for k-bit Enumerative Sphere Shaping (ESS) of multidimensional constellations includes converting a first set of a plurality of uniformly distributed data bits from a serial data bit stream to a first unsigned amplitude sequence comprising a plurality of amplitudes bounded by a spherical constellation of maximum energy levels of a plurality of energy levels, wherein the first unsigned amplitude sequence has a Gaussian distribution and each of the energy levels is determined by a respective one of the amplitudes in the amplitude sequence. The first unsigned amplitude sequence is converted to a first shaped data bit sequence. The first shaped data bit sequence is combined with a second set of a one or more uniformly distributed data bits from the serial data bit stream to form a combined data stream. The combined data stream is mapped to a combined amplitude stream.