Multi-Stage Timing and Frequency Synchronization
First Claim
1. A method of synchronizing a receiving device with a transmitting device in a wireless communication network, said method comprising:
- receiving one or more reference signals transmitted by the transmitting device to the receiving device;
reducing a search space for timing and frequency offsets by performing timing offset estimation based on a first set of reference symbols selected from said one or more reference signals, or performing frequency offset estimation based on a second set of reference symbols selected from said one or more reference signals, or both; and
performing joint timing and frequency offset estimation over said reduced search space using a third set of reference symbols selected from said one or more reference signals to obtain estimates of said timing and frequency offsets.
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Abstract
According to exemplary embodiments of the invention, timing and frequency offset estimation is divided into two or more stages. In each stage, a different subset of the available reference symbols is selected to perform timing synchronization, frequency synchronization, or joint timing and frequency synchronization. In each non-final stage, a respective set of the reference symbols is used to perform timing synchronization or frequency synchronization in order to narrow the uncertainty window for the timing or frequency offset, and thus reduce the search space for the final stage. In the final stage, a different set of reference symbols may be used to perform joint timing and frequency synchronization over the reduced search space.
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Citations
18 Claims
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1. A method of synchronizing a receiving device with a transmitting device in a wireless communication network, said method comprising:
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receiving one or more reference signals transmitted by the transmitting device to the receiving device; reducing a search space for timing and frequency offsets by performing timing offset estimation based on a first set of reference symbols selected from said one or more reference signals, or performing frequency offset estimation based on a second set of reference symbols selected from said one or more reference signals, or both; and performing joint timing and frequency offset estimation over said reduced search space using a third set of reference symbols selected from said one or more reference signals to obtain estimates of said timing and frequency offsets. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An access terminal comprising:
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a transceiver circuit for receiving one or more reference signals from a base station; and a processing circuit to perform timing and frequency synchronization, said processing circuit being configured to; reduce a search space for timing and frequency offsets by performing timing offset estimation based on a first set of reference symbols selected from said one or more reference signals, or performing frequency offset estimation based on a second set of reference symbols selected from said one or more reference signals, or both; and perform joint timing and frequency offset estimation over said reduced search space using a third set of reference symbols selected from said one or more reference signals to obtain estimates of said timing and frequency offsets. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification