METHOD AND APPARATUS FOR GENERATING EFFICIENT DFT-ED PREAMBLE SEQUENCE

摘要

Disclosed are a method and an apparatus that efficiently generate a DFT-ed preamble sequence used in uplink PRACH transmission of a wireless communication system. The method for generating a DFT-ed preamble sequence in a wireless communication system includes: calculating a first index value corresponding to the length of a DFT-ed preamble sequence by using control information; extracting a value on a unit circle corresponding to the first index value or a value on the unit circle corresponding to a second index value acquired by transforming the first index value according to a preamble format; reflecting a sign on the unit circle including the corresponding index value to the extracted value on the unit circle; and multiplying a value to which the sign is reflected by an initial sequence value according to a root index.

主权项

1. An apparatus for generating a DFT-ed preamble sequence, the apparatus comprising:
an index calculating unit calculating a first index value corresponding to the length of a Zadoff-Chu sequence by using control information; an index transforming unit transforming the first index value into a second index value according to a predetermined index transforming process; a quadrant deciding unit deciding a quadrant on a unit circle including the first index value or the second index value by receiving the first index value and the second index value, respectively from the index calculating unit and the index transforming unit and outputting a sign value of the corresponding quadrant; a lookup table extraction unit extracting a value on the unit circle corresponding to the first index value or the second index value in a lookup table and reflecting the sign value output from the quadrant deciding unit to the extracted value and outputting the corresponding value; an initial sequence calculating unit calculating and outputting an initial sequence value according to a root index; and a multiplier multiplying the output value of the lookup table extraction unit and the output value of the initial sequence calculating unit.