System Access and Synchronization Methods for MIMO OFDM Communications Systems and Physical Layer Packet and Preamble Design
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Abstract
A method and apparatus are provided for performing acquisition, synchronization and cell selection within an MIMO-OFDM communication system. A coarse synchronization is performed to determine a searching window. A fine synchronization is then performed by measuring correlations between subsets of signal samples, whose first signal sample lies within the searching window, and known values. The correlations are performed in the frequency domain of the received signal. In a multiple-output OFDM system, each antenna of the OFDM transmitter has a unique known value. The known value is transmitted as pairs of consecutive pilot symbols, each pair of pilot symbols being transmitted at the same subset of sub-carrier frequencies within the OFDM frame.
45 Citations
17 Claims
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1-5. -5. (canceled)
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6. A method in a communication network, comprising:
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dividing sub-carriers of a header OFDM symbol into a non-contiguous set of sub-carriers for each antenna of a plurality of antennas of a transmitter; and transmitting each non-contiguous set of sub-carriers using each respective antenna of the plurality of antennas. - View Dependent Claims (7, 8, 9, 10, 11)
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12. An apparatus in a communication network, comprising:
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means for dividing sub-carriers of a header OFDM symbol into a non-contiguous set of sub-carriers for each antenna of a plurality of antennas of a transmitter; and means for transmitting each non-contiguous set of sub-carriers using each respective antenna of the plurality of antennas. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification