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ISM frequency band mobile communication frequency shift transmission repeater
Description
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Technical field
The present invention relates to a kind of operating frequency alien frequencies transmission mobile communication relay system, just utilize the mobile communication wireless frequency-shift repeater of ISM band transmission, hereinafter to be referred as the mobile communication wireless frequency-shift repeater.
Background technology
In the mobile communications network of China is built, the mobile communication relay system, just more and more important role has been played the part of in the repeater.Mobile communication direct base station in network mainly comprises following several: with the covering amplifier is extended in wireless discharging-directly station, Optical Fiber Transmission repeater, trunk amplifier, base station frequently.Be respectively described below:
Wireless intra-frequency repeater.This is modal a kind of repeater, low being easy to of equipment cost installed, especially convenient resettlement, be to mend the method blind, that the increase coverage territory is the easiest, if but with the improper interference that very easily causes the base station of wireless discharging-directly station accent survey frequently, especially in CDMA systems, this phenomenon is more obvious.Therefore when access network, pay special attention to.Such repeater is mainly used in areas such as suburb, rural area, hills, is subjected to the restriction of isolation between the dual-mode antenna in the engineering opening, causes can not normally using in some occasion, and can not cover to area of coverage omnidirectional.
Optical fiber repeater.This is the repeater of thinking more stable in using at present, it need use optical fiber that base station signal is connected in the direct discharging station, signal source is purer, generally is not easy big net is formed interference, will control the bottom noise level of access base station during optical fiber repeater uses.When using for indoor covering, when the access of high-lager building employing optical fiber occurring, sometimes for the telephone traffic between each sector of balance, the optical fiber repeater that also can adopt many sectors to insert.Such repeater is mainly used in the area of fiber resource, is not having optical fiber or fiber resource area very in short supply, and lays the relatively area of difficulty of optical fiber, and the application of optical fiber repeater is restricted.
Trunk amplifier.Have place to show one's prowess in the indoor distribution of mobile communication signal in this repeater, it receives the network signal that distributes from signal source and directly amplifies back covering corresponding area.Compare with other model repeaters, strict to the requirement of the degree of purity of the signal of signal source, if the signal of signal source is pure inadequately, directly influence coverage effect.
Base station.Base station also is that a kind of radiofrequency signal is directly put equipment, and it generally connects together with the base station, mainly is to be used for directly enlarging the coverage of base station, amplifies downstream signal, and polygamy connects tower amplifier and amplifies upward signal during application.This equipment is applied in suburb, remote countryside more, is used for the traffic capacity affluence but the base station of coverage deficiency.It should be noted that simple tower item amplifies that often effect is not ideal.
Summary of the invention
Purpose of the present invention is in order to overcome the above-mentioned defective that prior art exists, particularly avoid the shortcoming of traditional intra-frequency repeater and optical fiber repeater, a kind of Mobile communication direct base station that adopts the relaying frequency different again and again with work to carry out relay transmission in free space is provided, the present invention has that rapid link is disposed, networking mode flexibly, to characteristics such as big net interference are less.
The mobile communication wireless frequency-shift repeater, whole system comprises proximal device and remote equipment, it is characterized in that: at down direction, this system's near-end is from obtaining mobile communication communication network signal by electric coupling in the air or directly, by the processing of radio frequency unit, adjust to suitable level, enter converter unit, be transformed into the relaying frequency, then by high linear power amplification unit output; Far-end relaying antenna receives the wireless signal of near-end, through the processing of radio frequency unit, adjusts to suitable level, enter converter unit, the relaying frequency is rotated back into operating frequency, then according to covering requirement, by the high linear suitable power of power amplification unit output; At up direction, Signal Processing process and down direction are identical, the antenna-feedback system of far-end receives the uplink network signal, through after the radio frequency unit processing signal of telecommunication being delivered to converter unit, convert the relaying frequency to and obtain suitable level by linear amplifier, and launch, after the relaying antenna of near-end receives the wireless signal of far-end, processing by radio frequency unit, adjust to suitable level, enter converter unit, the relaying frequency is changed back to operating frequency, adjust to suitable level by linear amplifier then, launch.
The shift frequency unit adopts the 12.8M constant-temperature crystal oscillator of high stability and accuracy as local vibration source, has guaranteed the frequency stability of whole shift frequency unit, and frequency error is within ± 0.02ppm.
The shift frequency unit is made up of frequency mixer, amplifier, filter, local vibration source, phase-locked loop and oscillator VCO, the adjusted radiofrequency signal of process radio frequency unit is by mixing and amplification, change to IF-FRE with appropriate level, pass through intermediate-frequency filter and amplifier then, enter into second level frequency mixer, obtain the needed output frequency in shift frequency unit, then by filtering, filtering local vibration source signal.Described shift frequency unit adopts and is down-converted to intermediate frequency, by intermediate frequency filtering, upconverts to output frequency then.
Operating frequency is in the main frequency range of China Mobile, these mobile communication system comprise Tetra (Terrestrial Trunked Radio) digital clustering communication system, code division multiple access CDMA (CodeDivision Multiple Access) 800M public access mobile radio, GSM (Globe Systemfor Mobile) 900M public access mobile radio, digital communication DCS (DigitalCommunication System) 1800M public access mobile radio, and WCDMA (Wide-Band CDMA) third generation public access mobile radio in the future, CDMA2000 third generation public access mobile radio, concrete working frequency range such as following table:
| System's kind | Frequency range | Remarks | |
| Up | Descending | ||
| The Tetra network | 806-821MHz | ?851-866MHz | Digit cluster communication system |
| The CDMA800M network | 825-835MHz | ?870-880MHz | |
| (E) GSM900M network | 885-915MHz | ?930-960MHz | |
| The DCS1800M network | 1710-1755 MHz | ?1805-1850MHz | |
| The WCDMA/CDMA2000 network | 1920-1980 MHz | ?2110-2170 ?MHz | The groundwork frequency range |
| 1755-1785 MHz | ?1850-1880 ?MHz | Replenish working frequency range | |
The relaying frequency adopts ISM band, and band limits is 2.4G--2.4835G, because this frequency range is the open frequency range that country does not have committee, can select suitable shift frequency frequency range in this scope according to concrete needs.
The invention has the advantages that the defective of avoiding present conventional repeater, following advantage is specifically arranged: (1) rapid link is disposed.Because do not need to bury underground optical fiber, can finish connection in several days being as short as.(2) flexible networking.Owing to adopt the alien frequencies transmission means, device antenna is isolated almost not requiring, the restriction of having avoided the place that antenna is installed; In addition, nearly far-end configuration under the situation that can't find suitable margin signal, adopts frequency-shift repeater can make engineering design more flexible and convenient.(3) disturb less to big net.Because the relaying frequency of employing and operating frequency alien frequencies has been avoided the interference to big net that may exist in transmission course.(4) cost is low.In the place that does not have fiber resource, with respect to the cost of laying optical fiber, the shift frequency frequency-shift repeater is much lower.
Description of drawings
Fig. 1 is wireless frequency-shift repeater communication system schematic diagram.
Fig. 2 is that wireless frequency-shift repeater near-end is realized block diagram.
Fig. 3 is that wireless frequency-shift repeater far-end is realized block diagram.
Fig. 4 shift frequency unit theory diagram.
Embodiment
The invention will be further described in conjunction with the accompanying drawings.
The mobile communication wireless frequency-shift repeater, whole system comprises proximal device and remote equipment, it is characterized in that: at down direction, this system's near-end is from obtaining mobile communication communication network signal by electric coupling in the air or directly, by the processing of radio frequency unit, adjust to suitable level, enter converter unit, be transformed into the relaying frequency, then by high linear power amplification unit output; Far-end relaying antenna receives the wireless signal of near-end, through the processing of radio frequency unit, adjusts to suitable level, enter converter unit, the relaying frequency is rotated back into operating frequency, then according to covering requirement, by the high linear suitable power of power amplification unit output; At up direction, Signal Processing process and down direction are identical, the antenna-feedback system of far-end receives the uplink network signal, through after the radio frequency unit processing signal of telecommunication being delivered to converter unit, convert the relaying frequency to and obtain suitable level by linear amplifier, and launch, after the relaying antenna of near-end receives the wireless signal of far-end, processing by radio frequency unit, adjust to suitable level, enter converter unit, the relaying frequency is changed back to operating frequency, adjust to suitable level by linear amplifier then, launch.
Shift frequency of the present invention unit adopts the 12.8M constant-temperature crystal oscillator of high stability and accuracy as local vibration source, has guaranteed the frequency stability of whole shift frequency unit, and frequency error is within ± 0.02ppm.
Being primarily aimed at the key component of frequency-shift repeater now---the shift frequency unit is further described in conjunction with Fig. 4.Be adjusted into the radiofrequency signal of appropriate level through radio frequency unit, enter the shift frequency unit, at first by mixing and amplification, change to IF-FRE with appropriate level, pass through intermediate-frequency filter and amplifier then, enter into second level frequency mixer, obtain the needed output frequency in shift frequency unit, then by filtering, the filtering local oscillation signal.
The shift frequency unit adopts the constant-temperature crystal oscillator of high stability and pinpoint accuracy as local vibration source, has guaranteed frequency accuracy, stability and the good temperature characterisitic of whole shift frequency unit.Adopt the low VCO that makes an uproar mutually, guaranteed well making an uproar mutually of mixing frequency, and guaranteed that the low of whole shift frequency unit make an uproar mutually.The shift frequency unit adopts intermediate frequency filtering, has higher frequency selectivity.
Claims (5)
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Claims (5)
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1, mobile communication wireless frequency-shift repeater, whole system comprises proximal device and remote equipment, it is characterized in that: at down direction, this system's near-end is from obtaining mobile communication communication network signal by electric coupling in the air or directly, signal is adjusted to suitable level by the processing of radio frequency unit, is input to the shift frequency unit, operating frequency is converted to the relaying frequency, and adjusts to suitable level output by power amplifier; Far-end is adjusted to suitable level with the near-end downstream signal that receives by radio frequency unit, enters the shift frequency unit, and the relaying frequency is changed back to operating frequency, and adjusts to suitable level output by high linear power amplifier, covers corresponding zone; At up direction, Signal Processing process and down direction are identical, and the antenna-feedback system of far-end receives the uplink network signal, after handling through radio frequency unit the signal of telecommunication are delivered to the shift frequency unit, convert the relaying frequency to, and export by power amplifier; Near-end is adjusted to suitable level with the far-end downstream signal that receives by radio frequency unit, enters the shift frequency unit, and the relaying frequency is changed back to operating frequency, and adjusts to suitable level output by power amplifier, sends the mobile communication base station to.
2, mobile communication wireless frequency-shift repeater according to claim 1 is characterized in that: adopt the relaying frequency of the ISM band of 2.4G frequency range to transmit between near, the remote equipment.
3, mobile communication wireless frequency-shift repeater according to claim 1, it is characterized in that: the shift frequency unit is made up of frequency mixer, amplifier, filter, local vibration source, phase-locked loop and oscillator VCO, the adjusted radiofrequency signal of process radio frequency unit is by mixing and amplification, change to IF-FRE with appropriate level, pass through intermediate-frequency filter and amplifier then, enter into second level frequency mixer, obtain the needed output frequency in shift frequency unit, then by filtering, filtering local vibration source signal.
4 mobile communication wireless frequency-shift repeaters according to claim 1 is characterized in that: described shift frequency unit adopts and is down-converted to intermediate frequency, by intermediate frequency filtering, upconverts to output frequency then.
5, according to the mobile communication wireless frequency-shift repeater described in the claim 3, it is characterized in that: shift frequency unit local vibration source is the 12.8M constant-temperature crystal oscillator.