Patent ID: 7254122

Claim:
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: PN code generating means for generating inphase(I)-channel and quadrature (Q)-channel pseudo noise (PN) sequences; pulse shaping means connected to the PN code generating means for shaping an I-channel PN signal and a Q-channel PN signal by filtering the I-channel and Q-channel PN sequences; equalizing means connected to the pulse shaping means 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; interpolation filtering means connected to the equalizing means 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; modulation means connected to the interpolation filtering means for modulating IF I-channel and Q-channel signals and for generating a modulated I-channel signal and a modulated Q-channel signal; combining means connected to the modulation means for combining the modulated I-channel signal with the modulated Q-channel signal and generating a digital pilot beacon signal; D/A conversion means connected to the combining means for converting the digital pilot beacon signal into an analog pilot beacon signal; filtering means connected to the D/A conversion means 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 amplifying means connected to the filtering means for amplifying the filtered pilot beacon signal.