Patent ID: 7623562

Claim:
An initial synchronization acquiring device in a parallel processed DS-CDMA UWB system, the device comprising: a correlator for correlating input signals and outputting correlation result values; an initial synchronizer for tuning initial symbol synchronization and frame synchronization by using the correlation result values received from the correlator and then generating and storing combining mark values and a synchronization position value in a register wherein the initial synchronizer comprises: a synchronization discriminator for determining whether signals received from the correlator are synchronized and then outputting result values; and a combining mark/synchronization position detector for storing the result values received from the synchronization discriminator in a buffer and then, if the combining mark values stored within the buffer are changed based on the stored result values, obtaining a synchronization position value and storing the obtained synchronization position value and the changed combining mark values in the register, said combining mark values and the synchronization position value are values resulting after an initial synchronization acquisition; wherein the synchronization discriminator comprises: a multiplier for receiving a plurality of input signals upon reception of despread complex values from the correlator and then respectively multiplying the input signals by preamble patterns received from a symbol matched filter; a coherent combining adder for coherently combining multiplication values received from the multiplier and thereby outputting M pairs of coherent combining result values, wherein M is a positive integer; an energy calculator for calculating M energy values by using the coherent combining result values received from the coherent combining adder; a noncoherent combining adder for noncoherently combining the M energy values received from the energy calculator and thereby outputting a noncoherent combining result value; a comparator for comparing the noncoherent combining result value received from the noncoherent combining adder with a threshold value, and then, if the noncoherent combining result value is identical to or below the threshold value, continuously performing a filtering function with a predetermined preamble pattern, and, if the noncoherent combining result value is above the threshold value, resetting a N×M symbol out of a N×M+A symbol period as a preamble pattern and performing a filtering function with the reset preamble pattern, wherein N is a positive integer and A is a positive integer; a max finder for measuring the energy values received through the noncoherent combining adder and then storing up to P(P≧1) grade discrimination result values and thereby determining whether synchronization is performed; and a max storage for storing the up to P-grade discrimination result values received from the max finder.