SCATTERED PILOT PATTERN AND CHANNEL ESTIMATION METHOD FOR MIMO-OFDM SYSTEMS
First Claim
1. An OFDM receiver, comprising:
- at least one receive antenna operable to receive OFDM symbols transmitted from a plurality of transmit antennas, the OFDM symbols transmitted from each transmit antenna comprising pilot symbols in a respective pattern in time-frequency and data symbols in an identical frequency-hopping pattern in time-frequency, the pilot symbols for each respective pattern in time-frequency inserted such that pilot symbols from different transmit antennas do not occupy the same location in time-frequency; and
a channel estimator operable to compare the received pilot symbols to pilot symbol values known to be transmitted by a transmitter to estimate a channel between the transmitter and the receiver.
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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
16 Claims
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1. An OFDM receiver, comprising:
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at least one receive antenna operable to receive OFDM symbols transmitted from a plurality of transmit antennas, the OFDM symbols transmitted from each transmit antenna comprising pilot symbols in a respective pattern in time-frequency and data symbols in an identical frequency-hopping pattern in time-frequency, the pilot symbols for each respective pattern in time-frequency inserted such that pilot symbols from different transmit antennas do not occupy the same location in time-frequency; and a channel estimator operable to compare the received pilot symbols to pilot symbol values known to be transmitted by a transmitter to estimate a channel between the transmitter and the receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of processing OFDM symbols transmitted from a plurality of transmit antennas, the OFDM symbols transmitted from each transmit antenna comprising pilot symbols in a respective pattern in time-frequency and data symbols in an identical frequency-hopping pattern in time-frequency, the pilot symbols for each respective pattern in time-frequency inserted such that pilot symbols from different transmit antennas do not occupy the same location in time-frequency, the method comprising:
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receiving the OFDM symbols on at least one receive antenna; and comparing the received pilot symbols to pilot symbol values known to be transmitted by a transmitter to estimate a channel between the transmitter and the receiver. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. The method as defined in claim 16, wherein the step of processing the information identifying the particular form of pre-processing used to encode the received pilot symbols to differentiate between received pilot symbols from different sources differentiates between received pilot symbols from different sources occurring at a same time-frequency location.
Specification