TDMA communicating method and TDMA receiving apparatus
First Claim
1. A time division multiple access (TDMA) communicating method comprising the steps of:
- performing a time division multiple access for a one-point-to-multi-point communication between a base station and a plurality of subscriber stations as outdoor units with radio frequencies corresponding to zones;
transmitting, from the subscriber stations, TDMA signals with time slots of a common TDMA synchronous frame by each of the subscriber stations in the outdoor units in such a manner that the TDMA signals of the subscriber stations do not overlap;
receiving a plurality of TDMA signals with different radio frequencies transmitted by each of the subscriber stations in the outdoor units said receiving step being performed by a plurality of reception units;
converting, in the base station, the TDMA signals of the subscriber stations into signals with a same frequency, said converting step being performed by a plurality of converters;
combining the converted signals so as not to overlap the TDMA signals, said combining step being performed by a combining unit in the base station;
demodulating the combined signal, said demodulating step performed by a demodulating circuit in the base station; and
obtaining information signals of the subscriber stations from the demodulating signal by a TDMA control circuit on the base station.
1 Assignment
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Accused Products
Abstract
A TDMA receiving apparatus for use with a base station including a plurality of receiving antennas, a plurality of outdoor units for converting received signals into first intermediate frequency signals, a plurality of unit connecting cables for sending the intermediate frequency signals, and an indoor unit for obtaining demodulated signals from the intermediate frequency signals. The indoor unit has a plurality of second frequency converters for converting the first intermediate frequency signals into second intermediate frequency signals with the same frequency and a power combining unit for combining the second intermediate frequency signals. The combined intermediate frequency signal is demodulated by a common demodulating circuit.
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Citations
11 Claims
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1. A time division multiple access (TDMA) communicating method comprising the steps of:
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performing a time division multiple access for a one-point-to-multi-point communication between a base station and a plurality of subscriber stations as outdoor units with radio frequencies corresponding to zones; transmitting, from the subscriber stations, TDMA signals with time slots of a common TDMA synchronous frame by each of the subscriber stations in the outdoor units in such a manner that the TDMA signals of the subscriber stations do not overlap; receiving a plurality of TDMA signals with different radio frequencies transmitted by each of the subscriber stations in the outdoor units said receiving step being performed by a plurality of reception units; converting, in the base station, the TDMA signals of the subscriber stations into signals with a same frequency, said converting step being performed by a plurality of converters; combining the converted signals so as not to overlap the TDMA signals, said combining step being performed by a combining unit in the base station; demodulating the combined signal, said demodulating step performed by a demodulating circuit in the base station; and obtaining information signals of the subscriber stations from the demodulating signal by a TDMA control circuit on the base station. - View Dependent Claims (2)
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3. A TDMA receiving apparatus for use with a base station for transmitting a time division multiplex information signal in a one-point-to-multi-point communication performed between the base station and a plurality of subscriber stations in a TDMA method, the apparatus comprising:
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a plurality of reception units for receiving a plurality of TDMA signals with different radio frequencies in an outdoor unit; a plurality of converters for converting the received signals into intermediate frequency signals with a same frequency in an indoor unit; a combining unit for combining the intermediate frequency signals so as not to overlap the TDMA signals in the indoor unit; a demodulating circuit for demodulating the combined signal generated by said combining unit in the indoor unit; and a TDMA control circuit in the indoor unit for obtaining information signals of the subscriber stations from the demodulated signal. - View Dependent Claims (4)
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5. A TDMA receiving apparatus for use with a base station for transmitting a time division multiplex information signal in a one-point-to-multi-point communication performed between the base station and a plurality of subscriber stations in a TDMA method, the apparatus comprising:
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a plurality of receiving antennas for receiving the TDMA signals with different radio frequencies from different directions; a plurality of outdoor units disposed adjacent to the receiving antennas; a plurality of reception units in the outdoor units for receiving the TDMA signals with different radio frequencies from said plurality of receiving antennas; a plurality of first converters in the outdoor units adapted for converting signals received from the reception units into intermediate frequency signals and outputting the intermediate frequency signals; a plurality of unit connecting cables for sending the intermediate frequency signals received from the outdoor units; an indoor unit coupled to the plurality of unit connecting cables; a plurality of converters in the indoor unit for converting intermediate frequency signals into intermediate frequency signals with a same frequency; a combining unit for combining the intermediate frequency signals so as not to overlap the TDMA signals in the indoor unit, the combining unit generating a combined signal; a demodulating circuit for generating a demodulated signal from the combined signal generated by said combining unit; and a TDMA control circuit in the indoor unit for obtaining information signals of the subscriber stations from the demodulated signal. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A TDMA communication apparatus for use with a base station for transmitting a time division multiplex information signal in one-point-to-multi-point communication performed between the base station and a plurality of subscriber station in a TDMA method, the apparatus comprising:
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means for inputting a plurality of modulated signals to be transmitted to a subscriber station, and for arranging these signals to one signal sequence as a predetermined synchronous frame in the TDMA method; means for modulating the one signal sequence with a first frequency, and for converting the first frequency modulated signals into transmission frequency signals; means for receiving a plurality of TDMA signals with different radio frequencies from the subscriber stations; a converter for converting the received signals into intermediate frequency signals with the same center frequency; means for combining the powers of the intermediate frequency signals into a combined signal; a demodulator for demodulating the combined signal; and means for obtaining information signals of the subscriber stations from the demodulated signal.
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Specification