Method and system for an OFDM joint timing and frequency tracking system
First Claim
1. A method for processing communication signals, the method comprising:
- tracking carrier frequency and symbol timing in an Orthogonal Frequency Division Multiplexing (OFDM) signal based on at least a reference symbol set, said tracking including generating frequency error information and timing error information by comparing an input clock signal to frequency and timing information extracted from said OFDM signal utilizing said reference symbol set; and
adjusting a receiver frequency and timing based on said tracked carrier frequency and symbol timing.
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Accused Products
Abstract
Aspects of a method and system for an OFDM joint timing and frequency tracking system may include tracking carrier frequency and symbol timing in an Orthogonal Frequency Division Multiplexing (OFDM) signal based on at least a reference symbol set. A receiver frequency and timing may be adjusted based on the tracked carrier frequency and symbol timing. The carrier frequency may be tracked by generating an output signal as a function of a frequency offset Δƒ, and the symbol timing may be tracked by generating an output signal as a function of a guard time Δtg. The received OFDM signal may be fast Fourier transformed to generate the reference symbol (RS) set. The receiver frequency and timing may be adjusted coarsely prior to fine adjustment. The coarse receiver frequency and the timing adjustment may be based on processing a primary synchronization signal and a secondary synchronization signal.
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Citations
24 Claims
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1. A method for processing communication signals, the method comprising:
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tracking carrier frequency and symbol timing in an Orthogonal Frequency Division Multiplexing (OFDM) signal based on at least a reference symbol set, said tracking including generating frequency error information and timing error information by comparing an input clock signal to frequency and timing information extracted from said OFDM signal utilizing said reference symbol set; and adjusting a receiver frequency and timing based on said tracked carrier frequency and symbol timing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for processing communication signals, the system comprising:
one or more circuits configured to, at least; track carrier frequency and symbol timing in an Orthogonal Frequency Division Multiplexing (OFDM) signal based on a reference symbol set, said tracking including generating frequency error information and timing error information by comparing an input clock signal to frequency and timing information extracted from said OFDM signal utilizing said reference symbol set; and adjust a receiver frequency and timing based on at least said tracked carrier frequency and symbol timing. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
Specification