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 two pairs of transmitting antennas, the OFDM frames having a time domain and a frequency domain, the method comprising:
- for each antenna, sparsely distributing pilot symbols in a respective pattern in time-frequency, the patterns being identical for each pair of antennas, the pattern for a first antenna of each of the two pairs of antennas being offset in frequency with respect to the pattern for a second antenna of that pair of antennas, and a pilot density for a first pair of the two pairs of transmitting antennas is higher than a pilot density for a second pair of the two pairs of transmitting antennas.
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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
12 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 two pairs of transmitting antennas, the OFDM frames having a time domain and a frequency domain, the method comprising:
for each antenna, sparsely distributing pilot symbols in a respective pattern in time-frequency, the patterns being identical for each pair of antennas, the pattern for a first antenna of each of the two pairs of antennas being offset in frequency with respect to the pattern for a second antenna of that pair of antennas, and a pilot density for a first pair of the two pairs of transmitting antennas is higher than a pilot density for a second pair of the two pairs of transmitting antennas. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An Orthogonal Frequency Division Multiplexing (OFDM) base station of a wireless network, the OFDM base station having at least two pairs of transmitting antennas configured to transmit data symbols in OFDM frames, the OFDM frames having a time domain and a frequency domain, the base station configured to:
for each antenna, sparsely distribute pilot symbols in a respective pattern in time-frequency, the patterns being identical for each pair of antennas, the pattern for a first antenna of each of the two pairs of antennas being in frequency with respect to the pattern for a second antenna of that pair of antennas, and a pilot density for a first pair of the two pairs of transmitting antennas is higher than a pilot density for a second pair of the two pairs of transmitting antennas. - View Dependent Claims (8, 9, 10, 11, 12)
Specification