CN201004638Y - High frequency bandwidth shift frequency repeater - Google Patents
High frequency bandwidth shift frequency repeater Download PDFInfo
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- CN201004638Y CN201004638Y CNU2006200367736U CN200620036773U CN201004638Y CN 201004638 Y CN201004638 Y CN 201004638Y CN U2006200367736 U CNU2006200367736 U CN U2006200367736U CN 200620036773 U CN200620036773 U CN 200620036773U CN 201004638 Y CN201004638 Y CN 201004638Y
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- 229910052701 rubidium Inorganic materials 0.000 description 1
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Abstract
The high frequency broad band frequency shift repeater is provided with a local terminal and a far terminal which have the same combination and all include a signal modulated transmitting and receiving demodulation part. The repeater is provided with a GPS receiver to receive the timepiece signal which is transmitted by the pseudorandom digital signal, and an oscillator consisting of a TCXO is controlled by the timepiece signal, to get the 100MHz phase locking reference source. All the phase locking sources in the repeater consist of the phase locking reference sources. The phase locking source in the repeater is the medium phase locking, and a medium and a mono-tube oscillatory circuit are used for forming a self-excitation voltage controlled oscillator, after the oscillatory frequency is divided, the divided frequency and the phase locking reference resources phase generate the controlling voltage, then to control the voltage controlled oscillator, thereby forming a signal phase locking ring. The local terminal and the remote terminal all adopt the GPS signals to make the phase locking reference sources, to effectively balance the phase locking frequency and the phase at the two terminals, without influence by the temperature difference at the two places, with an error of the two-terminal phase locking source frequency less than 2 multiplies 10<minus 9>, a system phase not more than 5 DEGs, a frequency of the medium phase locking source up to more than 15GHz, a frequency stability up to 1 multiplies 10< minus 9>.
Description
(1) technical field
The utility model relates to the mobile communication network technology field, is specially a kind of high frequency broad band friquency shift repeator.
(2) technical background
Mobile communication is universal day by day, and its user also further improves the seamless covering of an urgent demand signal to the requirement of network.Since be subjected to the restriction of cost, the impossible Large scale construction base station of mobile communication carrier, and the deficiency of base station number will cause wireless signal overlay area deficiency, causes the network quality variation, and then influence user's development, cause cost of investment to be difficult to rapid recovery.And that the repeater has cost of investment is low, flexible for installation easy, can enlarge the characteristics of wireless coverage area rapidly, finds broad application in mobile communication.Traditional approach is to utilize base station and repeater in conjunction with covering.
The repeater has polytype, as frequency repeater, frequency selecting repeater, optical fiber repeater, frequency-shift repeater etc.Wherein intra-frequency repeater and frequency selecting repeater are modal repeaters, and low being easy to of equipment cost installed, and is the easiest mode in additional or increase coverage territory.But require the strong and signal stabilization of source signal, require donor signal and service signal that certain isolation is arranged simultaneously, as isolating by building and physical features.Intra-frequency repeater is mainly used in suburb, rural area, and because of being subjected to receiving the restriction of isolation between the antenna, certain this occasion can not normally be used, and can't cover peripheral region omnidirectional.Optical fiber repeater reality also is a kind of intra-frequency repeater, needs to use optical fiber as transmission medium base station signal to be inserted the repeater.Though there is not the problem of isolation in optical fiber repeater, in the area that does not have optical fiber, the area that optical fiber is difficult to lay can't be used.
Frequency-shift repeater is made up of local side and far-end two parts, and local side links to each other with the base station, and far-end is placed on the place that needs wireless coverage.Frequency-shift repeater also is divided into frequency-shift repeater and two kinds of transmission frequency-shift repeaters in the machine.Frequency-shift repeater requires the strong and signal stabilization of source signal in the machine, but isolation is not required.The transmission frequency-shift repeater is to signal source and the equal no requirement (NR) of isolation, and the signal that local side will be introduced from the base station moves through modulation and is the high-frequency signal emission, obtains intermediate-freuqncy signal through the demodulation reduction again after far-end receives.Otherwise the mobile phone signal of far-end also sends to local side through shift frequency.Wireless coverage is realized in the alternative any repeater of transmission frequency-shift repeater, solving on residential quarters, rural area covering, hill path covering, the outlying little traffic zone wireless coverage especially, or the zone that signal covers and mounting condition is restricted, signal is complicated, system's isolation is difficult to guarantee, the transmission frequency-shift repeater just shows its superiority more.
The key of frequency-shift repeater processing signals is to guarantee the steady accuracy and the phase equalization of stability, local side and the far-end frequency of frequency.The wireless signal of mobile data and broadband network data has strict requirement to relay transmission: frequency stability≤5 * 10
-8, phase error (RMS)≤5 °, the system phase noise≤-95dBc/10KHz.In order to reach above-mentioned technical conditions, require the shift frequency frequency stabilization of local side and far-end emission, require the signal frequency after local side and far-end shift frequency are handled to be consistent simultaneously.Local side and far-end are in two places, and emission is different with the frequency that receives, and can't use same clock source, has just increased the error of local side and far-end tranmitting frequency.Particularly when shift frequency skew is big, just require higher to the stability in clock source, two places.
Frequency-shift repeater uses the higher constant-temperature crystal oscillator OCXO of stability, temperature compensating crystal oscillator TCXO or rubidium source etc. to make timing reference input more at present.The reference source cost height of these high stabilities, and must regularly carry out frequency calibration, to guarantee the frequency stability of long-term work, not only safeguard inconvenience, maintenance cost also improves greatly.At present frequency-shift repeater carrier frequency frequency generally has only 1.5GHz and 1.8GHz, and high carrier frequency frequency is 3.5GHz, and frequency stability is ± 5 * 10
-8, when the carrier frequency frequency further improves, the stability of present timing reference input can't satisfy the requirements at the higher level to frequency stability.
(3) utility model content
The purpose of this utility model is a kind of high frequency broad band friquency shift repeator of design, and it utilizes the GPS precise clock source to make the phase-locked reference source of 100MHz, utilizes medium to add phase-locked fabrication techniques phase locked source, guarantees transmitting-receiving frequency and phase stabilization.
The high frequency broad band friquency shift repeator of the utility model design is made up of local side and far-end, and two ends are formed similar, include signal modulate emission and signal receiving demodulation part.
Repeater local side or far-end include intermediate frequency Modulation, bandpass filtering, low noise amplification, mixing, rf modulations, bandpass filtering, preposition amplification and power amplification circuit and duplexer and antenna; Also comprise radio demodulating, bandpass filtering, low noise amplification, intermediate-freuqncy signal separation, intermediate frequency demodulation, bandwidth-limited circuit, be reduced into intermediate-freuqncy signal.
Its modulating part is: operating frequency is not dropped on single channel in the radio-frequency modulator frequency band or multichannel transmit and carry out intermediate frequency Modulation respectively, signal after the modulation carries out bandpass filtering and low noise is amplified, amplified IF signal and operating frequency drop on transmitting in the radio-frequency modulator band and carry out mixing, form compound intermediate-freuqncy signal; Again compound intermediate-freuqncy signal is carried out rf modulations, the signal after the modulation carries out bandpass filtering, preposition amplification and power amplification, and the radiofrequency signal after the amplification is coupled to antenna by duplexer, carries out the space transmission;
Its demodulation part is: the microwave signal that receives by antenna enters the demodulation passage by duplexer, signal amplifies through low noise earlier, amplified signal is carried out radio demodulating, signal after the demodulation carries out the midband pass filter and low noise is amplified, amplified signal is carried out the intermediate-freuqncy signal separation by three different band pass filters, and as-reduced intermediate-freuqncy signal is directly exported, and the intermediate-freuqncy signal that reduction is good is carried out intermediate frequency demodulation once more as yet, bandpass filtering is reduced into the original intermediate-freuqncy signal of the other side at last.
Also dispose the GPS receiver, receive the clock signal that the pseudorandom number signal sends of passing through of gps satellite, GPS receiver and temperature compensating crystal oscillator connect to form oscillator, are the phase-locked reference source of 100MHz.Phase locked sources all in this repeater all are connected, make phase locked source with this phase-locked reference source, to guarantee the stability of system frequency and phase place.
This repeater phase locked source is the medium phase locked source, working medium and single-tube oscillator are formed the self-excitation voltage controlled oscillator, frequency of oscillation produces control voltage with the phase-locked reference source phase demodulation of above-mentioned 100MHz behind the two-stage frequency division, control voltage is controlled voltage controlled oscillator again, form the signal phase-locked loop, guarantee the stability of frequency.
The advantage of this high frequency broad band friquency shift repeator is: 1, utilize gps signal to make the phase-locked reference source of 100MHz high accuracy, the clock source based on the caesium atom of gps signal is not vulnerable to that electromagnetism is sudden and violent, the influence in ionosphere and low-frequency disturbance source, output phase and amplitude are all highly stable, at-35 ℃～+ 65 ℃ equal down energy steady operations, frequency stability reaches 1 * 10
-14Phase noise is less than-140dBc/1KHz, can guarantee to be accurate in the annual 3ns, so the oscillator that this repeater is made up of its control high accuracy temperature compensating crystal oscillator, the timing reference input of acquisition is all very outstanding lockin signal reference source of frequency stability, phase stability and phase noise; 2, the phase-locked reference source that all adopts the gps clock signal to make because of local side and far-end, the frequency of phase locking of efficient balance local side and far-end and phase place, be equivalent to local side and far-end and use same reference source, be not subjected to factor affecting such as the two places temperature difference, guarantee that transmitting-receiving two-end phase locked source frequency error is less than 2 * 10
-9, systematic phase error (RMS) :≤5 °; 3, reference source has accurately been arranged, the phase locked source frequency that medium adds phase-locked fabrication techniques can reach more than the 15GHz, and frequency stability reaches 1 * 10
-9, phase noise is less than-95dBc/Hz (10KHz), the final system phase noise to-below the 90dBc/Hz (10KHz).
(4) description of drawings
Fig. 1 is the schematic block circuit diagram of this high frequency broad band friquency shift repeator embodiment 1 local side;
Fig. 2 is the schematic block circuit diagram of this high frequency broad band friquency shift repeator embodiment 1 far-end.
(5) embodiment
Embodiment 1
The circuit structure of the high frequency broad band friquency shift repeator local side that this is routine, as shown in Figure 1.
Modulating part: the IF1 that is obtained by base station side is that 870～880MHz and IF2 are 954～960MHz intermediate-freuqncy signal, enter frequency mixer 1 together with the signal of phase locked source 1 and phase locked source 2 respectively and frequency mixer 2 carries out intermediate frequency Modulation, be modulated to 1800MHz, signal after the modulation carries out bandpass filtering and low noise is amplified, and two groups of intermediate-freuqncy signals after the amplification enter mixer and form compound intermediate-freuqncy signal; Again compound intermediate-freuqncy signal is sent into frequency mixer 3 with the signal of phase locked source 3 and carry out rf modulations, be modulated to 10.5GHz, signal after the modulation carries out bandpass filtering, preposition amplification and power amplification, and the radiofrequency signal after the amplification is coupled to antenna by duplexer, and antenna transmits;
The demodulation part: the repeater remote microwave signal that receives by antenna enters the demodulation passage by duplexer, signal amplifies through low noise earlier, amplified signal is sent into frequency mixer 6 with the signal of phase locked source 6 and is carried out radio demodulating, separate and be transferred to 1800MHz, signal after the demodulation carries out the midband pass filter and low noise is amplified, amplified signal enters splitter and carries out the intermediate-freuqncy signal separation, two groups of intermediate-freuqncy signals of gained are respectively through two different band pass filters, send into frequency mixer 4 respectively with the signal of phase locked source 4 and phase locked source 5 again and frequency mixer 5 carries out intermediate frequency demodulation once more, bandpass filtering is reduced into original intermediate-freuqncy signal IF3 of the other side and IF4 at last.
Phase locked source: the GPS receiver, the clock signal of passing through the transmission of pseudorandom number signal of reception gps satellite, the oscillator with this clock signal controlling is made up of temperature compensating crystal oscillator obtains the phase-locked reference source of 100MHz.In this example in the local side apparatus two rf modulations and four 6 used phase locked sources of intermediate frequency Modulation all adopt this phase-locked reference source.Phase locked source working medium and single-tube oscillator are formed the self-excitation voltage controlled oscillator, and frequency of oscillation produces control voltage with the phase-locked reference source phase demodulation of 100MHz behind the two-stage frequency division, and control voltage is controlled voltage controlled oscillator again, forms the signal phase-locked loop.
This routine local side radio-frequency modulator phase locked source frequency is 10.53GHz, and the phase locked source frequency in the if demodulator is 1.8GHz.
High frequency broad band friquency shift repeator far-end that this is routine and local side distance are 5 kilometers, the circuit structure and the local side of far-end are basic identical, as shown in Figure 2, receive that microwave signal that local side sends is demodulated into intermediate-freuqncy signal IF1 and IF2 after after the power amplification by dedicated antenna spatial emission towards periphery, receive by the cellphone subscriber; This antenna is also delivered to local side from user mobile phone receiving intermediate frequency signal IF3 and IF4 modulate emission.The same GP configuring S receiver of far-end, receive gps satellite clock signal, in order to the oscillator that control is made up of temperature compensating crystal oscillator, the phase-locked reference source of acquisition 100MHz.6 phase locked sources all adopt this phase-locked reference source in the remote equipment.Phase locked source is the medium phase locked source.
This routine far end radio frequency modulator phase locked source frequency is 10.0GHz, and the phase locked source frequency in the if demodulator is 1.8GHz.
This routine repeater bandwidth of operation is 300MHz after testing, and the steady accuracy of system frequency is 4 * 10
-8, meet≤5 * 10
-8Technical standard.
Embodiment 2
Local side is similar to last example to the circuit structure of far-end in this example, and far-end and local side distance are 10 kilometers, and local side radio-frequency modulator phase locked source frequency is 13.23GHz, and the phase locked source frequency in the if demodulator is 1.8GHz; Far end radio frequency modulator phase locked source frequency is 12.7GHz, and the phase locked source frequency in the if demodulator is 1.8GHz.
This routine repeater bandwidth of operation is 200MHz after testing, and the steady accuracy of system frequency is 3 * 10
-8, meet≤5 * 10
-8Technical standard.
Claims (2)
1 one kinds of high frequency broad band friquency shift repeators are made up of local side and far-end, and two ends are formed similar, include signal modulate emission and signal receiving demodulation part;
Repeater local side or far-end include intermediate frequency Modulation, bandpass filtering, low noise amplification, mixing, rf modulations, bandpass filtering, preposition amplification and power amplification circuit and duplexer and antenna; Also comprise radio demodulating, bandpass filtering, low noise amplification, intermediate-freuqncy signal separation, intermediate frequency demodulation, bandwidth-limited circuit; It is characterized in that:
Also dispose the GPS receiver, itself and temperature compensating crystal oscillator connect to form oscillator, are the phase-locked reference source of 100MHz, and phase locked sources all in this repeater all are connected with this phase-locked reference source.
2 high frequency broad band friquency shift repeators according to claim 1 is characterized in that:
This repeater phase locked source is the medium phase locked source, and medium and single-tube oscillator are formed the self-excitation voltage controlled oscillator, and this oscillator is connected phase demodulation with the phase-locked reference source of above-mentioned 100MHz behind the two-stage frequency dividing circuit, insert voltage controlled oscillator again, forms the signal phase-locked loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200367736U CN201004638Y (en) | 2006-12-23 | 2006-12-23 | High frequency bandwidth shift frequency repeater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200367736U CN201004638Y (en) | 2006-12-23 | 2006-12-23 | High frequency bandwidth shift frequency repeater |
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| Publication Number | Publication Date |
|---|---|
| CN201004638Y true CN201004638Y (en) | 2008-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2006200367736U Expired - Lifetime CN201004638Y (en) | 2006-12-23 | 2006-12-23 | High frequency bandwidth shift frequency repeater |
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| Country | Link |
|---|---|
| CN (1) | CN201004638Y (en) |
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2006
- 2006-12-23 CN CNU2006200367736U patent/CN201004638Y/en not_active Expired - Lifetime
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080109 |
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| EXPY | Termination of patent right or utility model |