Acquisition of initial code synchronization in a receiving system for a
code division multiple access (CDMA) signal is realized by producing a
complex digital signal having K components by sampling an analog signal
derived from the received CDMA-modulated signal. Components of the complex
digital signal are correlated with N code phases. The energies of these
correlated values are examined, in parallel, to determine whether the
ratio of the maximum energy within the block to the average energy in the
block equals or exceeds a predetermined threshold. If so, this is a valid
maximum, and the code synchronization is complete. If not, further
components of the complex digital signal are correlated with another set
of N code phases, and are examined in the same manner. Accordingly,
reliable determination as to whether code synchronization has been
achieved can be realized with minimal influence of channel distortion in a
CDMA received signal.
