Apparatus and method for generating pilot beacon signal in base stations of CDMA system

A method of generating pilot beacon signals for handoff between base stations having a different frequency assignment (FA) in a code division multiple access (CDMA) radio communication system, the method comprising the steps of:

• generating inphase(I)-channel and quadrature (Q)-channel pseudo noise (PN) sequences;
• shaping an I-channel PN signal and a Q-channel PN signal by filtering the I-channel and Q-channel PN sequences with a pulse shaping means;
• equalizing phases of the I-channel PN signal and the Q-channel PN signal and generating an equalized I-channel signal and an equalized Q-channel signal
• converting frequencies of the equalized I-channel signal with the equalized Q-channel signal to intermediate frequencies (IF) and generating an IF I-channel signal and an IF Q-channel signal;
• modulating IF I-channel and Q-channel signals and generating a modulated I-channel signal and a modulated Q-channel signal;
• combining the modulated I-channel signal with the modulated Q-channel signal and generating a digital pilot beacon signal;
• converting the digital pilot beacon signal into an analog pilot beacon signal;
• filtering the analog pilot beacon signal, extracting a desired band of the analog pilot beacon signal, and generating a filtered pilot beacon signal;
• and
• amplifying the filtered pilot beacon signal.

An apparatus for generating pilot beacon signals for handoff between base stations having a different frequency assignment (FA) in a code division multiple access (CDMA) radio communication system, the apparatus comprising:

• a PN code generating unit for generating inphase(I)-channel and quadrature (Q)-channel pseudo noise (PN) sequences;
• a pulse shaping unit connected to the PN code generating unit for shaping an I-channel PN signal and a Q-channel PN signal by filtering the I-channel and Q-channel PN sequences;
• an equalizing unit connected to the pulse shaping unit for equalizing phases of the I-channel PN signal and the Q-channel PN signal and for generating an equalized I-channel signal and an equalized Q-channel signal;
• an interpolation filtering unit connected to the equalizing unit for converting frequencies of the equalized I-channel signal with the equalized Q-channel signal to intermediate frequencies (IF) and generating an IF I-channel signal and an IF Q-channel signal;
• a modulation unit connected to the interpolation filtering unit for modulating IF I-channel and Q-channel signals and for generating a modulated I-channel signal and a modulated Q-channel signal;
• a combining unit connected to the modulation unit for combining the modulated I-channel signal with the modulated Q-channel signal and generating a digital pilot beacon signal;
• D/A conversion unit connected to the combining unit for converting the digital pilot beacon signal into an analog pilot beacon signal;
• a filtering unit connected to the D/A conversion unit for filtering the analog pilot beacon signal, extracting a desired band of the analog pilot beacon signal and generating a filtered pilot beacon signal;
• and
• an amplifying unit connected to the filtering unit for amplifying the filtered pilot beacon signal.