Patent ID: 9178560
Filing Date: 2015-11-03
Classification: H04B,H04J,H04L

Abstract:
1. A decoding unit for decoding at least part of a signal transmitted over a communication channel of a wireless network, the signal modulating a plurality of symbols, each symbol being arranged to carry a plurality of information which are code-division multiplexed, each information being spreaded: in the frequency domain, across a given plurality of frequency carriers, based on a phase rotated version of a known code exhibiting constant-amplitude zero autocorrelation, CAZAC, property; and, in the time domain, across the plurality of symbols, based on one of a plurality of known orthogonal cover codes; wherein each information is associated with a known sequence of phase rotations, the phase in the known sequence varying deterministically between the plurality of symbols; the decoding unit comprising: a symbol control unit arranged to: a time-domain despreading unit coupled to the symbol control unit and arranged to despread, in the time domain, the plurality of aligned symbols according to the known orthogonal cover codes; and, a frequency-domain despreading unit coupled to the time-domain despreading unit and arranged to despread, in the frequency domain, the time domain despreaded aligned symbols according to the known CAZAC codes.