Scattered pilot pattern and channel estimation method for MIMO-OFDM systems
First Claim
1. A method for inserting data and pilot symbols into an Orthogonal Frequency Division Multiplexing (OFDM) transmission resource for transmission on N transmitting antenna where N≧
- 2, the OFDM transmission resource having a time domain and a frequency domain, each OFDM transmission resource comprising a plurality of OFDM symbols, the method comprising the steps of;
for each antenna,inserting pilot symbols in a respective pattern in time-frequency; and
inserting data symbols in a frequency-hopping pattern in time-frequency that is identical for all the antennas,wherein the pilot symbols for each antenna are inserted such that pilot symbols from other antennas do not occupy the same location in time-frequency.
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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
21 Claims
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1. A method for inserting data and pilot symbols into an Orthogonal Frequency Division Multiplexing (OFDM) transmission resource for transmission on N transmitting antenna where N≧
- 2, the OFDM transmission resource having a time domain and a frequency domain, each OFDM transmission resource comprising a plurality of OFDM symbols, the method comprising the steps of;
for each antenna, inserting pilot symbols in a respective pattern in time-frequency; and inserting data symbols in a frequency-hopping pattern in time-frequency that is identical for all the antennas, wherein the pilot symbols for each antenna are inserted such that pilot symbols from other antennas do not occupy the same location in time-frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- 2, the OFDM transmission resource having a time domain and a frequency domain, each OFDM transmission resource comprising a plurality of OFDM symbols, the method comprising the steps of;
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19. An OFDM transmitter comprising:
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a plurality of transmit antennas; an encoder adapted to insert data symbols in an identical frequency-hopping pattern in time-frequency for each of the plurality of antennas; a pilot inserter adapted to insert pilot symbols in a respective pattern in time-frequency for each of the antennas, wherein the pilot symbols for each antenna are inserted such that pilot symbols from other antennas do not occupy the same location in time-frequency. - View Dependent Claims (20, 21)
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Specification