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1. (WO2018089985) RELIABLE ORTHOGONAL SPREADING CODES IN WIRELESS COMMUNICATIONS

Pub. No.:    WO/2018/089985    International Application No.:    PCT/US2017/061489
Publication Date: Fri May 18 01:59:59 CEST 2018 International Filing Date: Wed Nov 15 00:59:59 CET 2017
IPC: H04B 1/707
H04J 13/10
Applicants: RAMPART COMMUNICATIONS, LLC
Inventors: ROBINSON, Matthew Brandon
PALMISANO, Andrew Keith
ARMS, Kregg Elliott
MOORE, Audrey Nichole
Title: RELIABLE ORTHOGONAL SPREADING CODES IN WIRELESS COMMUNICATIONS
Abstract:
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.