Patent EP0680156A2 successfully refreshed from Google Patents.
EP0680156A2
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Radio station apparatus and signal transmission method thereof
Assignee: NEC Corp
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Filing: 1995-03-13
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Granted: —
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Expires: 2015-03-13
Abstract
Abstract Radio station apparatus includes an indoor unit (10), an outdoor unit (20), and a coaxial cable (60) which connects the indoor unit (10) and outdoor unit (20) to each other. An inputted first binary digital signal is converted into a serial second binary digital signal by a parallel/serial converter (2) and is modulated by amplitude shift keying (ASK) into a third binary digital signal by a modulator (13) with carrier f 3 (Hz), whose frequency is a common multiple of respective value of n (sampling number) x m (quantization bit number) times the data rate of the inputted data. The third binary digital signal is multiplexed by frequency division multiplexing with another signal or signals by a multiplexer (3) and transferred to the outdoor unit (20) through the coaxial cable (60). In the outdoor unit (20) the transferred third binary digital signal is demultiplexed and converted into an analog signal by a D/A converter (23). The analog signal is RF modulated by a modulator (24) and amplified by a power amplifier (25) and then transmitted.
Inventors
- 👤 Yasunori Yoshizawa
- 👤 Shinichi Ohmagari
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 03:00
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
233 words
A radio station apparatus which comprises an indoor unit and an outdoor unit tied to the indoor unit by a coaxial cable wherein an inputted first binary digital data signal having various data rate is converted into each corresponding signal, modulated with a predetermined radio carrier frequency and transmitted through an antenna, and a signal received through said antenna is demodulated and outputted, said radio station apparatus comprising: data rate conversion means provided in said indoor unit for converting said first binary digital data of frequency f₁ (Hz) into a serial second binary digital data of frequency f₂ (Hz) where f₂ (Hz) = f₁ x n x m (Hz) , where n is number of sampling and m is number of sampling quantization amount, m and n are mutually integers larger than two; modulation means provided in said indoor unit for modulating said second binary digital data to modulated signal with frequency f₃ (Hz) which is proportional to a multiple of frequency f₁ (Hz) and f₂ (Hz); demodulation means provided in said outdoor unit for demodulating said modulated signal inputted from said modulation means into third binary digital data consist of said number m with a frequency of product of f₁ and said number n ; and radio frequency modulation means within said outdoor unit for directly modulating said third binary digital data demodulated by said demodulation means with a predetermined radio frequency.
Claim 2
Dependent Claim
83 words
A radio station apparatus as claimed in claim 1, wherein said data rate conversion means comprises: a digital filter for oversampling said first binary digital data and outputting m bit parallel data with frequency f₁ x n (Hz); a parallel/serial converter for converting the output of said digital filter into said second binary digital data of frequency f₂ (Hz); and a modulator for modulating the output of said parallel/serial converter with the output of a carrier oscillator which oscillates the frequency f₃ (Hz).
Claim 3
Dependent Claim
53 words
A radio station apparatus as claimed in claim 2, wherein, when said first binary digital data has various data rate (f₁), the frequency f₃ (Hz) oscillated by said carrier oscillator is a constant frequency which is a common multiple among said frequencies f₂ (Hz) on the basis of said frequency f₁ (Hz) respectively.
Claim 4
Dependent Claim
23 words
A radio station apparatus as claimed in claim 2, wherein said modulator modulates with an amplitude shift keying which is abbreviated as ASK.
Claim 5
Dependent Claim
47 words
A radio station apparatus as claimed in claim 3, wherein said carrier oscillator supplies a sampling clock signal to said digital filter by way of a first frequency divider circuit and supplies a clock signal to said parallel/serial converter by way of a second frequency divider circuit.
Claim 6
Dependent Claim
105 words
A radio station apparatus as claimed in claim 1, wherein said outdoor unit comprises a multiplexer for selectively outputting the modulated signal which is modulated with frequency f₃ (Hz) sent from said indoor unit, a demodulator for demodulating the output of said multiplexer into the third binary digital data consist of m bits with frequency of f₁ x n (Hz), a digital/analog converter for converting the third binary digital data into a corresponding analog signal, and a radio frequency modulator for directly modulating the analog signal with a predetermined radio frequency and a power amplifier for amplifying the signal outputted from the radio frequency modulator.
Claim 7
Dependent Claim
115 words
A radio station apparatus as claimed in claim 6, wherein said demodulator comprises a carrier extraction circuit for extracting a clock signal of the third frequency f₃ (Hz) from the output of said modulator of said indoor unit inputted thereto by way of said multiplexer, a third frequency divider circuit for dividing frequency f₃ (Hz) received output of said carrier extraction circuit into the second frequency f₂ (Hz), a detection circuit for detecting the modulated wave by envelope detection, and a retiming circuit for converting the output of said detection circuit by serial/parallel conversion with the output of said third frequency divider circuit into data consist of m bits with frequency f₁ x n (Hz).
Claim 8
Dependent Claim
203 words
A digital transmission method for a radio station which comprises an indoor unit and an outdoor unit tied to the indoor unit by a coaxial cable, comprising the steps of: converting a first binary digital data signal inputted with a data rate of frequency f₁ (Hz) into a serial second binary digital data of frequency f₂ (Hz) which f₂ (Hz) equals to f₁ x n x m (Hz) where n is number of oversampling and m is number of sampling quantization amount, and number n and m are integers larger than two; modulating the serial second binary digital data having frequency f₂ (H₂) by amplitude shift keying which is abbreviated as ASK into a third binary digital data signal with a third frequency f₃ (Hz) which is a carrier frequency of an multiple of the first frequency f₁ (Hz); demodulating the third binary digital data with frequency f₃ (Hz) into a parallel signal consist of m bits with a frequency of the product of frequency f₁ (Hz) and number of sampling n; converting the demodulated transmission signal into analog signal; modulating said analog transmission signal with a predetermined radio carrier; and amplifying and transmitting the analog transmission signal modulated with the radio carrier.
Claim 9
Dependent Claim
143 words
A signal transmission method for a radio station as claimed in claim 8, wherein, the steps from the step of converting an incoming first binary digital data signal into a serial second binary digital signal up to the step of modulating the serial second binary digital data signal having frequency f₂ (Hz) into the third digital data signal by ASK with third frequency f₃ (Hz) is performed within an indoor unit and the other steps are performed within an outdoor unit, said signal transmission method further comprises the steps of : transferring the third binary digital data signal modulated by ASK with frequency f₃ (Hz) to said outdoor unit through said coaxial cable; and receiving the third binary digital data signal transferred from said indoor unit into said outdoor unit; and transferring the received third binary digital data signal to the demodulating step.
Claim 10
Dependent Claim
51 words
A signal transmission method for a radio station as claimed in claim 8, wherein, the inputted first binary digital data signals having various data rates f₁ (Hz)s are different from each other, and frequency f₃ (Hz)s are frequencies of common multiples among the second frequencies f₂ (Hz)s of each transmission data.
Claim 11
Dependent Claim
58 words
A signal transmission method for a radio station claimed in claim 9, wherein, the inputted first binary digital data are a plurality of data whose data rates f₁ (Hz)s are different from each other, and frequency f₃ (Hz)s are frequencies of common multiples among the frequencies f₁ (Hz) and f₂ (Hz) of each first binary digital data signal.
References Cited (Backward Citations)
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