Method, apparatus and computer program product providing synchronization for OFDMA downlink signal
First Claim
1. A method, comprising:
- obtaining time, carrier frequency and cell-specific preamble synchronization to a signal received by a radio frequency receiver bydetecting by the radio frequency receiver a frame boundary using preamble delay correlation;
detecting by the radio frequency receiver the frame boundary with greater precision using a conjugate symmetry property over a region identified during the first step of detecting the frame boundary;
the radio frequency receiver using cyclic prefix correlation to resolve symbol boundary repetition;
the radio frequency receiver using the cyclic prefix to estimate and correct a fractional carrier frequency offset;
the radio frequency receiver performing a fast fourier transform of an identified preamble symbol; and
the radio frequency receiver performing a frequency domain cross-correlation to identify cell-specific preamble sequences and an integer frequency offset in sub-carrier spacing.
5 Assignments
0 Petitions
Accused Products
Abstract
Disclosed is a method, a computer program product and a device that includes a receiver for receiving a downlink signal transmitted into a cell. The receiver is operable to obtain time, carrier frequency and cell-specific preamble synchronization to the received signal and includes a plurality of synchronization units that include a first detector to detect a frame boundary using preamble delay correlation; a second detector to detect the frame boundary with greater precision using a conjugate symmetry property over a region identified by the first detector; a cyclic prefix correlator to resolve symbol boundary repetition; an estimator, using the cyclic prefix, to estimate and correct a fractional carrier frequency offset; an operator to perform a Fast Fourier Transform of an identified preamble symbol and a frequency domain cross-correlator to identify cell-specific preamble sequences and an integer frequency offset in sub-carrier spacing. The transmitted signal may be a downlink signal transmitted into the cell from a base station that is compatible with IEEE 802.16e (WiMAX).
79 Citations
37 Claims
-
1. A method, comprising:
-
obtaining time, carrier frequency and cell-specific preamble synchronization to a signal received by a radio frequency receiver by detecting by the radio frequency receiver a frame boundary using preamble delay correlation; detecting by the radio frequency receiver the frame boundary with greater precision using a conjugate symmetry property over a region identified during the first step of detecting the frame boundary; the radio frequency receiver using cyclic prefix correlation to resolve symbol boundary repetition; the radio frequency receiver using the cyclic prefix to estimate and correct a fractional carrier frequency offset; the radio frequency receiver performing a fast fourier transform of an identified preamble symbol; and the radio frequency receiver performing a frequency domain cross-correlation to identify cell-specific preamble sequences and an integer frequency offset in sub-carrier spacing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A computer readable medium storing a computer program, execution of the computer program by a data processor resulting in operations that comprise obtaining time, carrier frequency and cell-specific preamble synchronization to a received signal by:
-
detecting a frame boundary using preamble delay correlation; detecting the frame boundary with greater precision using a conjugate symmetry property over a region identified during the first operation of detecting the frame boundary; using cyclic prefix correlation to resolve symbol boundary repetition; using the cyclic prefix to estimate and correct a fractional carrier frequency offset; performing a fast fourier transform of an identified preamble symbol; and performing a frequency domain cross-correlation to identify cell-specific preamble sequences and an integer frequency offset in sub-carrier spacing. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
-
-
29. An apparatus, comprising:
-
at least one processor and at least one memory including computer program code; the at least one memory and the computer program code stored on the memory is configured, with the at least one processor, to cause the apparatus, in response to a received downlink signal, to obtain time, carrier frequency and cell-specific preamble synchronization to the received signal said apparatus comprising a plurality of synchronization units comprising a first detector to detect a frame boundary using preamble delay correlation; a second detector to detect the frame boundary with greater precision using a conjugate symmetry property over a region identified by the first detector; a cyclic prefix correlator to resolve symbol boundary repetition; an estimator, using the cyclic prefix, to estimate and correct a fractional carrier frequency offset; an operator to perform a fast fourier transform of an identified preamble symbol; and a frequency domain cross-correlator to identify cell-specific preamble sequences and an integer frequency offset in sub-carrier spacing. - View Dependent Claims (30, 31, 32, 33)
-
-
34. A mobile station, comprising:
-
means for receiving a downlink signal, said receiving means operable to obtain time, carrier frequency and cell-specific preamble synchronization to the received signal and comprising a plurality of synchronization units comprising first means for detecting a frame boundary using preamble delay correlation; second means for detecting the frame boundary with greater precision using a conjugate symmetry property over a region identified by the first means for detecting; means for cyclic prefix correlation for resolving symbol boundary repetition; means for estimating and correcting, using the cyclic prefix, a fractional carrier frequency offset; means for performing a fast fourier transform of an identified preamble symbol; and means for frequency domain cross-correlation for identifying cell-specific preamble sequences and an integer frequency offset in sub-carrier spacing. - View Dependent Claims (35, 36, 37)
-
Specification