Patent ID: 8238491

Claim:
A device for demodulating a control signal received from each of a plurality of radio terminals based on correlation in frequency domain between a predetermined code and a reception signal including control signals and reference signals received from the plurality of radio terminals, wherein orthogonality between the control signals and orthogonality between the reference signals are accomplished by cyclic shifts of the predetermined code, comprising: a demultiplexer for demultiplexing a reference signal component and a control signal component from a correlation profile of the correlation in frequency domain; a path detector for detecting a path location of each radio terminal from power of the reference signal component; an extractor for extracting a reference signal correlation value from the reference signal component corresponding to the path location and a control signal correlation value from the control signal component corresponding to the path location; and a combiner for combining the reference signal correlation value and the control signal correlation value to generate a control signal of each of the plurality of radio terminals.