Scattered pilot pattern and channel estimation method for MIMO-OFDM systems
First Claim
1. A method of inserting data symbols into Orthogonal Frequency Division Multiplexing (OFDM) frames at an OFDM transmitter having at least one pair of transmitting antennas, the OFDM frames having a time domain and a frequency domain, the method comprising the steps of:
- for each antenna, inserting pilot symbols in a respective scattered pattern in time-frequency;
for each pair of antennas, mapping each data symbol to at least one respective combination of a selected antenna, a selected OFDM symbol transmitted by the selected antenna and a selected data sub-carrier of the selected OFDM symbol; and
permuting the data sub-carriers according to a frequency-hopping pattern that is identical for all of the antennas.
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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.
49 Citations
25 Claims
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1. A method of inserting data symbols into Orthogonal Frequency Division Multiplexing (OFDM) frames at an OFDM transmitter having at least one pair of transmitting antennas, the OFDM frames having a time domain and a frequency domain, the method comprising the steps of:
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for each antenna, inserting pilot symbols in a respective scattered pattern in time-frequency; for each pair of antennas, mapping each data symbol to at least one respective combination of a selected antenna, a selected OFDM symbol transmitted by the selected antenna and a selected data sub-carrier of the selected OFDM symbol; and permuting the data sub-carriers according to a frequency-hopping pattern that is identical for all of the antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for inserting data symbols into Orthogonal Frequency Division Multiplexing (OFDM) frames in an OFDM transmitter having at least one pair 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 pair of antennas to; map each data symbol to at least one respective combination of a selected antenna, a selected OFDM symbol transmitted by the selected antenna and a selected data sub-carrier of the selected OFDM symbol; and permute the data sub-carriers according to a frequency-hopping pattern that is identical for all of the antennas. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification