公开(公告)号：US20200162123A1

公开(公告)日：2020-05-21

申请号：US16690769

申请日：2019-11-21

申请人： Rampart Communications, Inc.

发明人： Matthew Brandon ROBINSON ,  Andrew Keith PALMISANO ,  Kregg Elliott ARMS ,  Audrey Nichole MOORE

IPC分类号： H04B1/707 ,  H04J13/16

摘要： Techniques of transmitting wireless communications involve generating orthogonal spreading codes for any number of user devices that are linear combinations of sinusoidal harmonics that match the frequencies within the spread bandwidth. Along these lines, prior to transmitting signals, processing circuitry may generate a set of initial code vectors that form an equiangular tight frame having small cross-correlations. From each of these rows, the processing circuitry produces a new spreading code vector using a code map that is a generalization of a discrete Fourier transform. The difference between the code map and a discrete Fourier transform is that the frequencies of the sinusoidal harmonics are chosen to match the particular frequencies within the spread bandwidth and differ from a center frequency by multiples of the original unspread bandwidth. Different transmitters may then modulate respective signals generated with different spreading code vectors.

公开(公告)号：US20210006288A1

公开(公告)日：2021-01-07

申请号：US17027144

申请日：2020-09-21

申请人： Rampart Communications, Inc.

发明人： Matthew Brandon ROBINSON ,  Andrew Keith PALMISANO ,  Kregg Elliott ARMS ,  Audrey Nichole MOORE

IPC分类号： H04B1/707 ,  H04J13/16

摘要： Techniques of transmitting wireless communications involve generating orthogonal spreading codes for any number of user devices that are linear combinations of sinusoidal harmonics that match the frequencies within the spread bandwidth. Along these lines, prior to transmitting signals, processing circuitry may generate a set of initial code vectors that form an equiangular tight frame having small cross-correlations. From each of these rows, the processing circuitry produces a new spreading code vector using a code map that is a generalization of a discrete Fourier transform. The difference between the code map and a discrete Fourier transform is that the frequencies of the sinusoidal harmonics are chosen to match the particular frequencies within the spread bandwidth and differ from a center frequency by multiples of the original unspread bandwidth. Different transmitters may then modulate respective signals generated with different spreading code vectors.