Patent ID: 8660201

Claim:
An apparatus for transmitting a synchronization signal using a plurality of transmit (Tx) antennas, the apparatus comprising: a synchronization signal generator for generating a first synchronization signal shifted based on a first shift code and generating a second synchronization signal shifted based on a second shift code; a transmission processor for allocating different subcarriers to a first Tx antenna and a second Tx antenna without overlapping, mapping the first synchronization signal to the first Tx antenna and the second synchronization signal to the second Tx antenna, and generating an orthogonal frequency division multiplexing (OFDM) symbol by performing inverse fast Fourier transformation (IFFT); a control signal coupler for determining the first shift code and the second shift code based on frame boundary information of a frame; and a radio frequency (RF) unit for transmitting the first synchronization signal via the first Tx antenna to a user equipment (UE) and transmitting the second synchronization signal via the second Tx antenna to the UE, wherein the frame boundary information is an index of the frame of a 5-ms length in a super-frame of a 20-ms length determined based on the first shift code and the second shift code, the super-frame including a plurality of frames, wherein the control signal coupler is further configured to determine the first shift code and the second shift code based on whether the frame includes a header of the super-frame, and wherein the second shift code is a code shifted in a time axis or a frequency axis with respect to the first shift code.