H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 1/48 (2006.01) H04B 1/56 (2006.01) H04B 7/26 (2006.01) H04M 1/725 (2006.01)
Patent
CA 2078406
In a radio telephone apparatus of the TDMA/TDD system, signal transmission and reception are conducted by use of carriers having an identical frequency. This leads to a problem that the transmission intermediate frequency carrier and the transmission RF carrier enter the receiver section in an identical housing, thereby causing a cochannel interference. To overcome this difficulty, there is disposed a frequency division modulator including a frequency divider for dividing by four a local signal having a frequency which is four times that of the intermediate frequency to obtain a carrier having a frequency shifted from that of the local signal by 90 ° . Signal to be modulated is subjected to an orthogonal modulation according to the carrier wave to produce an intermediate frequency carrier. The operation of the modulator is stopped in a signal reception state to prevent the intermediate frequency carrier undergone the orthogonal modulation from being produced.
Corporation Nec
Smart & Biggar
LandOfFree
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