Cell search in a wireless communication network

摘要

The present application relates to an orthogonal frequency division multiplexing (OFDM) receiver and a method of operating the receiver for performing a cell search. A coarse correlator block is provided to detect one cell out of a by plurality of wireless communication cells by determining first correlation metric values by applying a partial correlation comprising part-wise correlating sample data with each one of a first set of phase-rotated reference sequences and non-coherent combining. The maximum of the first correlation values yields to a cell identifier value. A fine correlator block is provided to estimate a fine time offset value for the one wireless communication cell by determining second correlation values by applying a correlation comprising correlating the he sample data with each one of a second set of phase-rotated reference sequences. The maximum of the second correlation values value yields to a fine time offset.

主权项

1. A method of operating a multicarrier communication receiver, said method comprising: retrieving sample data transformed in frequency domain from a buffer of the receiver, wherein the sample data comprises synchronization symbols each received from one of a plurality of wireless communication cells; detecting one wireless communication cell out of the plurality of wireless communication cells by providing a first set of phase-rotated reference sequences, which are based on a set of different reference sequences and a first set of rotation phase values, determining first correlation metric values by applying a partial correlation comprising part-wise correlating the sample data with each one of the first set of phase-rotated reference sequences and non-coherent combining the partial correlation values of the parts for each one of the first set of phase-rotated reference sequences, and determining a first maximum value of the first correlation metric values, wherein the first maximum value yields to a cell identifier value; estimating a fine time offset value for the one wireless communication cell by providing a second set of phase-rotated reference sequences, which are based on a reference sequence associated with the cell identifier value and a second set of rotation phase values, determining second correlation metric values by applying a correlation comprising correlating the sample data with each one of the second set of phase-rotated reference sequences, and determining a second maximum value of the second correlation metric values, wherein the second maximum value yields to a fine time offset; regenerating a synchronization symbol corresponding to the phase-rotated synchronization reference symbol based on the cell identifier value and the fine time offset; and cancelling the regenerated synchronization symbol from the sample data in the buffer.