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MC-CDMA multiplexing in an orthogonal uplink

  • US 8,638,870 B2
  • Filed: 12/16/2011
  • Issued: 01/28/2014
  • Est. Priority Date: 12/22/2004
  • Status: Active Grant
First Claim
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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.

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