SCATTERED PILOT PATTERN AND CHANNEL ESTIMATION METHOD FOR MIMO-OFDM SYSTEMS
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Accused Products
Abstract
Methods and apparatus are provided for inserting data symbols and pilot symbols in an OFDM (orthogonal frequency division multiplexing) transmission resource utilizing frequency hopping patterns for the data symbols and/or the pilot symbols. Data symbols and pilot symbols are allocated for down link (base station to mobile station) and up link (mobile station to bases station) transmission resources in a two-dimensional time-frequency pattern. For each antenna of a MIMO-OFDM (multiple input multiple output OFDM) communication system, pilot symbols are inserted in a scattered pattern in time-frequency and data symbols are inserted in an identical frequency-hopping pattern in time-frequency as that of other antennas.
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Citations
34 Claims
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1-9. -9. (canceled)
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10. A method of inserting data symbols into Orthogonal Frequency Division Multiplexing (OFDM) frames at an OFDM transmitter having a plurality of transmitting antennas, the OFDM frames having a time domain and a frequency domain, the method comprising:
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for each antenna, inserting pilot symbols in a respective scattered pattern in time-frequency; for each of the plurality of antennas, mapping each data symbol to at least one respective combination of a selected antenna, a selected OFDM symbol and a selected data sub-carrier; and for each data symbol, permuting the selected data sub-carriers according to a frequency-hopping pattern that is identical for all of the plurality of antennas. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A system for inserting data symbols into Orthogonal Frequency Division Multiplexing (OFDM) frames in an OFDM transmitter having a plurality of transmitting antennas, the OFDM frames having a time domain and a frequency domain, the system comprising:
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at least one pilot inserter operable, for each antenna, to insert pilot symbols in a respective scattered pattern in time-frequency; and at least one encoder operable, for each of the plurality of antennas to; map each data symbol to at least one respective combination of a selected antenna, a selected OFDM symbol and a selected data sub-carrier; and for each data symbol, permute the selected data sub-carriers according to a frequency-hopping pattern that is identical for all of the plurality of antennas. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification