United States Patent 7,715,460
Tsai , et al. May 11, 2010
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Hybrid orthogonal frequency division multiple access system and method
Abstract
A hybrid orthogonal frequency division multiple access (OFDMA) system including a transmitter and a receiver is disclosed. The transmitter includes a first spread OFDMA subassembly, a first non-spread OFDMA subassembly and a first common subassembly. The first spread OFDMA subassembly spreads input data and maps the spread data to a first group of subcarriers. The first non-spread OFDMA subassembly maps input data to a second group of subcarriers. The first common subassembly transmits the input data mapped to the first and second group of subcarriers using OFDMA. The receiver includes a second spread OFDMA subassembly, a second non-spread OFDMA subassembly and a second common subassembly. The second common subassembly processes received data to recover data mapped to the subcarriers using OFDMA. The second spread OFDMA subassembly recovers the first input data by separating user data in a code domain and the second non-spread OFDMA subassembly recovers the second input data.
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Inventors: Tsai; Yingming (Boonton, NJ), Zhang; Guodong (Farmingdale, NY), Pan; Jung-Lin (Selden, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 11/406,878
Filed: April 19, 2006
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
60673872 Apr., 2005
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Current U.S. Class: 375/131 ; 375/260
Current International Class: H04B 1/00 (20060101); H04K 1/10 (20060101)
Field of Search: 375/132,138,260,267,299,340,342,346-350,131 370/208,210
