Patent ID: 8638870
Filing Date: 2014-01-28
Classification: H04B,H04J,H04L

Abstract:
1. A method of a wireless multi-carrier communications system, comprising: dividing sub-carriers on an uplink into non-overlapped groups; allocating a time-frequency block to a plurality of users in common, the plurality of users comprising a first user and a second user, the time-frequency block having a hopping duration and a non-overlapped group; spreading symbols of the first user and the second user over the time-frequency block, wherein the symbols of the first user are spread using a first set of orthogonal codes differing from a second set of orthogonal codes used to spread the symbols of the second user; mapping each spread symbol of the plurality of users to a modulation symbol in the time-frequency block; generating an orthogonal waveform based on the mapped symbols; and transmitting the orthogonal waveform.