Mobile communication method and apparatus using backscattering of carrier
First Claim
1. A mobile station transmitting data to and receiving data from an external base station at high speed, the mobile station comprising:
- a mobile station communication controller for processing data including control data to output a predetermined data frame;
a mobile station source coder for receiving the data frame and performing source coding on it according to a predetermined coding method to output coded data;
a first modulator for receiving a first carrier having a predetermined frequency and modulating the coded signal from the mobile source coder using the first carrier to generate a first modulated signal;
a second modulator for receiving a second carrier having a predetermined frequency and performing modulation on the first modulated signal using the second carrier to generate a modulated uplink signal;
a mobile station interfacer for transmitting the modulated uplink signal to the base station and receiving a modulated downlink signal from the base station;
a first demodulator for receiving and demodulating the modulated downlink signal received from the base station via the mobile station interfacer and outputting demodulated data; and
a mobile station source decoder for performing source decoding on the demodulated data from the first demodulator to convert the demodulated data to a baseband signal.
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Accused Products
Abstract
A mobile communication apparatus and method using backscattering of a carrier is provided. The mobile communication apparatus includes a mobile station including a mobile station communication controller for processing data including control data to output a predetermined data frame, a mobile station source coder for receiving the data frame and performing source coding on it according to a predetermined coding method to output coded data, a first modulator for receiving a first carrier having a predetermined frequency and modulating the coded signal from the mobile source coder using the first carrier to generate a first modulated signal, a second modulator for receiving a second carrier having a predetermined frequency and performing modulation on the first modulated signal using the second carrier to generate a modulated uplink signal, a mobile station interfacer for transmitting the modulated uplink signal to the base station and receiving a modulated downlink signal from the base station, a first demodulator for receiving and demodulating the modulated downlink signal received from the base station via the mobile station interfacer and outputting demodulated data, and a mobile station source decoder for performing source decoding on the demodulated data from the first demodulator to convert the demodulated data to a baseband signal. Accordingly, high speed data communication can be realized, and the necessity of a special data pattern necessary for frame synchronization can be removed. Since the mobile station performs amplitude shift keying (ASK) modulation using a carrier received from a base station after performing differential phase shift keying (DPSK) modulation, it does not requires a separate oscillator so that hardware configuration can be simplified. Consequently, the mobile station can be economically manufactured.
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Citations
18 Claims
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1. A mobile station transmitting data to and receiving data from an external base station at high speed, the mobile station comprising:
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a mobile station communication controller for processing data including control data to output a predetermined data frame;
a mobile station source coder for receiving the data frame and performing source coding on it according to a predetermined coding method to output coded data;
a first modulator for receiving a first carrier having a predetermined frequency and modulating the coded signal from the mobile source coder using the first carrier to generate a first modulated signal;
a second modulator for receiving a second carrier having a predetermined frequency and performing modulation on the first modulated signal using the second carrier to generate a modulated uplink signal;
a mobile station interfacer for transmitting the modulated uplink signal to the base station and receiving a modulated downlink signal from the base station;
a first demodulator for receiving and demodulating the modulated downlink signal received from the base station via the mobile station interfacer and outputting demodulated data; and
a mobile station source decoder for performing source decoding on the demodulated data from the first demodulator to convert the demodulated data to a baseband signal. - View Dependent Claims (2, 3, 4)
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5. A base station transmitting data to and receiving data from an external mobile station at high speed, the base station comprising:
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a base station communication controller for processing data including control data to output a predetermined data frame;
a base station interfacer for receiving a modulated uplink signal from the mobile station and transmitting a modulated downlink signal to the mobile station;
a mixer for mixing the modulated uplink signal with a predetermined intermediate frequency and filtering the mixed signal to convert the modulated uplink signal to a signal having the predetermined intermediate frequency;
an oscillator for generating the predetermined intermediate frequency;
a base station demodulator for demodulating the output signal of the mixer to generate a baseband signal according to a predetermined demodulation method;
a base station source decoder for receiving the baseband signal from the base station demodulator and performing source decoding according to a predetermined method;
a base station source coder for performing source coding the data frame output from the base station communication controller; and
a base station modulator for modulating the output data of the base station source coder according to a predetermined method and outputting modulated data to the base station interfacer. - View Dependent Claims (6, 7, 8, 9)
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10. A data communication method of a mobile station transmitting data to and receiving data from an external base station at high speed, the data communication method comprising the steps of:
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processing data including control data to form a predetermined mobile station information data frame;
coding the mobile station information data frame according to a predetermined source coding method and performing primary modulation on the coded data frame using a predetermined first carrier according to a first predetermined modulation/demodulation method;
performing secondary modulation on the primarily modulated signal using a predetermined second carrier according to a second predetermined modulation/demodulation method and transmitting the secondarily modulated signal to the base station;
demodulating a modulated downlink signal transmitted from the base station according to the second predetermined modulation/demodulation method and generating the demodulated signal as a source coded signal; and
decoding the source coded signal according to a predetermined source decoding method to reconstruct original data. - View Dependent Claims (11, 13, 15, 16, 17, 18)
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12. A data communication method of a base station transmitting data to and receiving data from an external mobile station at high speed, the data communication method comprising the steps of:
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receiving a modulated uplink signal transmitted from the mobile station to the base station, mixing the modulated uplink signal with a predetermined intermediate frequency and filtering the mixed signal to generate an intermediate signal having the predetermined intermediate frequency;
demodulating the intermediate signal according to a predetermined demodulation method to generate a baseband signal;
source-decoding the baseband signal according to a predetermined method to reconstruct original data received from the mobile station;
processing data including control data to form a data frame and source-coding the data frame; and
modulating the source coded data frame according to a predetermined method and transmitting the modulated signal to the mobile station.
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14. An electronic toll collecting system for collecting a toll, the electronic toll collecting system comprising a mobile station and a base station, wherein a variety of data including a toll is transmitted and received between the mobile station and the base station at high speed,
the mobile station comprising: -
a mobile station communication controller for processing control data and information including start place information and balance to form and output a mobile station information data frame, receiving base station information data including destination information and billing information from the base station, and recalculating and updating the balance;
a mobile station source coder for receiving the mobile station information data frame and performing source coding on it according to a predetermined coding method to output coded data;
a first modulator for receiving a first carrier having a predetermined frequency and modulating the coded signal from the mobile source coder using the first carrier to generate a first modulated signal;
a second modulator for receiving a second carrier having a predetermined frequency and performing modulation on the first modulated signal using the second carrier to generate a modulated uplink signal;
a mobile station interfacer for transmitting the modulated uplink signal to the base station and receiving a modulated downlink signal from the base station;
a first demodulator for receiving and demodulating the modulated downlink signal received from the base station via the mobile station interfacer and outputting demodulated data; and
a mobile station source decoder for performing source decoding on the demodulated data from the first demodulator to generate a baseband signal and transmitting the baseband signal to a base station communication controller, the base station comprising;
a base station interfacer for receiving a modulated uplink signal from the mobile station and transmitting a modulated downlink signal to the mobile station;
a mixer for mixing the modulated uplink signal with a predetermined intermediate frequency and filtering the mixed signal to generate a signal having the predetermined intermediate frequency;
an oscillator for generating the predetermined intermediate frequency;
a base station demodulator for demodulating the output signal of the mixer to generate a baseband signal;
a base station source decoder for receiving the baseband signal from the base station demodulator and performing source decoding according to a predetermined method;
a base station communication controller for analyzing the mobile station'"'"'s information data which is decoded and output by the base station source decoder to calculate a toll and processing data link layer control data and base station information data including destination information and billing data to form and output a predetermined base station information data frame;
a base station source coder for performing source coding the base station information data frame; and
a base station modulator for modulating the output data of the base station source coder according to a predetermined method and outputting modulated data to the base station interfacer.
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Specification