CN100373821C - TD-SCDMA field strength covering transmission method - Google Patents

TD-SCDMA field strength covering transmission method Download PDF

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Publication number
CN100373821C
CN100373821C CNB2005100942691A CN200510094269A CN100373821C CN 100373821 C CN100373821 C CN 100373821C CN B2005100942691 A CNB2005100942691 A CN B2005100942691A CN 200510094269 A CN200510094269 A CN 200510094269A CN 100373821 C CN100373821 C CN 100373821C
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signal
tdd
frequency
fdd
frequency signal
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CN1734985A (en
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林志华
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Quanzhou Z-Stone Technology Co., Ltd.
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林志华
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Abstract

The present invention provides a method of a TD-SCDMA field-strength coverage transmission. For reducing the cost of network coverage and solving the problem of time delay due to multiple-stage amplification, the present invention carries out the treatment of frequency change for a carrier frequency signal of a TDD source, and amplifies and transfers a medium frequency signal after the frequency change in an FDD mode; a receiving terminal amplifies the FDD medium frequency signal and reverts the medium frequency signal into a high-frequency signal which is covered by a network through an antenna. Thereby, in the field-density coverage transmission, the carrier frequency signal of the TDD source is amplified for only one time, namely, the method has only once time delay; in the process of transmission, frequency change adopts an FDD transmission mode, and thus, the present invention avoids the time delay accumulation due to the multiple-stage amplification and avoids the cost increase of the network coverage due to large transmission loss; meanwhile, the method improves the network coverage in the mode of a single base station with multiple amplifiers to avoid high cost brought by multiple base stations in a TDD mode.

Description

The TD-SCDMA field strength covering transmission method
Technical field
The present invention relates to TD-SCDMA (Time Division-Synchronous Code DivisionMultiple Acces, the CDMA (Code Division Multiple Access) that the time-division is synchronous) communication technical field, relate in particular to a kind of TD-SCDMA field strength covering transmission method.
Background technology
The TD-SCDMA wireless standard was given the ratification in International Telecommunications Union's radio (ITU-R) annual meeting in 2000 in 2000, as one of 3G (Third Generation) Moblie air interface technical specification, it has obtained comprehensive support of CWTS and 3GPP, be based on the 3G standard under TDD (time division duplex) pattern, tdd mode has very big flexibility in asymmetric traffic, TD-SCDMA only needs the Frequency Distribution of an asymmetric frequency range, because the switching point that the time domain up-downgoing is switched in every RC can change flexibly, so, can make full use of wireless frequency spectrum for symmetrical service (voice and multimedia etc.) and asymmetric traffic.But because TDD (time division duplex) adopts transmit-receive cofrequency switch duplex working method; because transmitter from the low-power to the high power (or opposite) has a stabilization time; it is equivalent to from receiving the change-over time of emission state (or opposite); can not accomplish that this " reception " just is in accepting state immediately; should " emission " just be in emission state immediately, and therefore need a guard time to cushion.When CF signal from transmitting terminal cable transmission process, in order to prevent the impact of high power to receiving terminal, need the control transmitting power, when the network coverage, need pass through multistage amplification like this, because the multistage amplification of signal back power strengthens, the cable overstriking, the corresponding increase of cost, and the every amplification of CF signal is once, time delay once just, repeatedly amplification will cause the time delay stack, and then cause time delay excessive, and the TDD signal can't large tracts of land cover; Also have the method that adopts one-level amplification, many base stations to solve time delay stack problem, but the cost of the network coverage then significantly improve.
Summary of the invention
Technical problem to be solved by this invention provides the TD-SCDMA field strength covering transmission method that a kind of time delay for once, network coverage cost are low, transmission is stable.
The technical solution used in the present invention is such: a kind of TD-SCDMA field strength covering transmission method, comprise that TDD source CF signal is handled, signal transmits, the TDD signal covers, and described TDD source CF signal is handled and is comprised the steps:
A, near-end TDD source CF signal is reduced to the FDD intermediate-freuqncy signal by frequency converter;
B, aforementioned FDD intermediate-freuqncy signal is carried out processing and amplifying;
C, the FDD intermediate-freuqncy signal after the aforementioned amplification is outputed to radio frequency cable and carries out remote transmission through duplexer;
Described TDD signal covers and comprises the steps:
D, the aforementioned FDD intermediate-freuqncy signal that the far-end duplexer is received are amplified;
E, the FDD intermediate-freuqncy signal after the aforementioned amplification is reduced to the TDD high-frequency signal by frequency converter;
F, aforementioned TDD high-frequency signal is carried out the network coverage by antenna.
Preferred above-mentioned TD-SCDMA field strength covering transmission method, TDD source its frequency of CF signal among the described step a is between 1.8~2.2GHz.
Preferred above-mentioned TD-SCDMA field strength covering transmission method, its frequency of FDD intermediate-freuqncy signal among the described step b is between 110MHz~450MHz.
Preferred above-mentioned TD-SCDMA field strength covering transmission method, its frequency of FDD intermediate-freuqncy signal among the described step b is between 110MHz~250MHz.
TD-SCDMA field strength covering transmission method provided by the invention, because TDD source CF signal is only through once amplifying, i.e. time delay for once, in transmission course, adopt FDD intermediate-freuqncy signal transmission mode by frequency reducing, thereby multistage amplification causes in time delay stack and the high-frequency transmission loss big when avoiding the transmission of TDD source CF signal, the problem that the networking cost is high, avoid the great number cost that bring many base stations under the tdd mode by the form increasing network coverage of the many amplifiers in single base station simultaneously, transmit by converting fdd mode in addition, equipment or active antenna restore into the TDD original signal endways, its high-isolation transmits and receives by antenna, owing to can make that signal stably transmits.
Description of drawings
Fig. 1 is TDD source CF signal transfer process figure;
Fig. 2 is that CF signal receives and sending module figure;
Fig. 3 is the frequency converter functional block diagram;
Embodiment
Embodiments of the invention provide a kind of TD-SCDMA field strength covering transmission method, for being easier to understand field strength covering transmission method of the present invention, present embodiment divides two parts to be described, the whole transfer process of TDD source CF signal (with reference to figure 1) is described by first, and second portion is described TDD source CF signal and received and sending module (with reference to figure 2).
With reference to figure 1, TDD source its field intensity covering method of CF signal of present embodiment comprises the steps:
A, be near-end TD-SCDMA downstream signal that TDD source CF signal is handled by frequency converter, become descending FDD intermediate-freuqncy signal, the frequency of described TDD source CF signal is 2.0GHz, and its frequency of FDD intermediate-freuqncy signal after the frequency reducing is 120MHz;
B, aforementioned FDD intermediate-freuqncy signal is amplified to power between the FDD intermediate-freuqncy signal of 27-42dBm such as 33dBm;
C, the FDD intermediate-freuqncy signal after the aforementioned amplification is outputed to radio frequency cable and carries out remote transmission through duplexer;
D, the remote termination duplexer is received aforementioned FDD intermediate-freuqncy signal amplify, the power after the amplification is 27dBm;
E, the FDD intermediate-freuqncy signal after the aforementioned amplification is reduced to the TDD high-frequency signal by frequency converter, its frequency is 2.0GHz, and power is 27dBm;
F, aforementioned TDD high-frequency signal is undertaken field intensity to the TD-SCDMA signal by active antenna cover.
Vice versa, and the TD-SCDMA signal is processed into the FDD intermediate-freuqncy signal by terminal TDD upward signal through frequency converter, and power is 0-27dBm after amplifying, and to the near-end machine, synthesizes the TD-SCDMA signal of TDD form by cable transmission by amplification, frequency conversion.
Above described be TDD source CF signal in whole transmission course, for the near-end machine, it is connected with base station signal, and base station signal is carried out relaying and converts the FDD intermediate-freuqncy signal to; For remote termination, it is reduced into the TDD high-frequency signal to the FDD intermediate-freuqncy signal that the near-end machine transmits, the signal that the TD-SCDMA terminal is come is handled simultaneously, promptly up TD-SCDMA, TDD source signal are processed into up FDD intermediate-freuqncy signal, remote termination can comprise that antenna also can not comprise antenna.Be in the descending process of TDD source CF signal, the near-end machine is by the frequency converter frequency reducing, and corresponding is that remote termination FDD intermediate-freuqncy signal is reduced to high frequency by frequency converter therewith; Opposite, in the up process of TDD high-frequency signal, remote termination TDD high-frequency signal carries out frequency reducing through the frequency converter of remote termination, and the frequency converter of corresponding therewith is near-end machine carries out raising frequency.Promptly no matter be near-end machine or remote termination, following several modules of tool (with reference to figure 2) all: the TDD signal receives 1, frequency converter 2, intermediate frequency processing and amplifying 3, duplexer 4, intermediate frequency processing and amplifying 5.Wherein, frequency converter 2 is carried out up-conversion or two functions of down-conversion, both can become high-frequency signal to intermediate-freuqncy signal, also can become intermediate-freuqncy signal to high-frequency signal.
With reference to figure 3, no matter be near-end machine or remote termination, described frequency converter 2 comprises several like this functional modules, be that TDD source CF signal is input to circulator 6, the high-frequency signal that comes out from circulator 6 is input to frequency mixer 7, frequency mixer 7 is connected with the VCO oscillator, through output FDD intermediate-freuqncy signal after frequency mixer 7 frequency reducings, carries out being transported to amplifier after the Filtering Processing through filter 8 again; The frequency converter of same remote termination is reduced to the TDD high-frequency signal to the FDD signal after amplifying by frequency mixer 10, carries out Filtering Processing through filter 9 again, is input to circulator 6 output TDD high-frequency signals then.

Claims (4)

1. a TD-SCDMA field strength covering transmission method comprises that TDD source CF signal is handled, signal transmits, the TDD signal covers, and it is characterized in that:
Described TDD source CF signal is handled and is comprised the steps:
A, near-end TDD source CF signal is reduced to the FDD intermediate-freuqncy signal by frequency converter;
B, aforementioned FDD intermediate-freuqncy signal is carried out processing and amplifying;
C, the FDD intermediate-freuqncy signal after the aforementioned amplification is outputed to radio frequency cable and carries out remote transmission through duplexer;
Described TDD signal covers and comprises the steps:
D, the aforementioned FDD intermediate-freuqncy signal that the far-end duplexer is received are amplified;
E, the FDD intermediate-freuqncy signal after the aforementioned amplification is reduced to the TDD high-frequency signal by frequency converter;
F, aforementioned TDD high-frequency signal is carried out the network coverage by antenna.
2. TD-SCDMA field strength covering transmission method as claimed in claim 1 is characterized in that TDD source its frequency of CF signal among the described step a is between 1.8~2.2GHz.
3. TD-SCDMA field strength covering transmission method as claimed in claim 1 or 2 is characterized in that its frequency of FDD intermediate-freuqncy signal among the described step b is between 110MHz~450MHz.
4. TD-SCDMA field strength covering transmission method as claimed in claim 3 is characterized in that its frequency of FDD intermediate-freuqncy signal among the described step b is between 110MHz~250MHz.
CNB2005100942691A 2005-09-03 2005-09-03 TD-SCDMA field strength covering transmission method Expired - Fee Related CN100373821C (en)

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Application Number Priority Date Filing Date Title
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CN100373821C true CN100373821C (en) 2008-03-05

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0829970A2 (en) * 1996-09-09 1998-03-18 Matsushita Electric Industrial Co., Ltd. Dual mode transceiver for TDMA and FDD modes
CN2558165Y (en) * 2002-04-25 2003-06-25 信息产业部电子第五十四研究所 All digital eight-diversity multi-rate compatible modem
CN2622968Y (en) * 2003-05-23 2004-06-30 厦门厦华特力通科技有限公司 Shift converter of straight base station
CN1538640A (en) * 2003-01-29 2004-10-20 ���ǵ�����ʽ���� Wireless communication system and method for offering hybrid duplexing technology
WO2005060182A1 (en) * 2003-12-18 2005-06-30 The University Court Of The University Of Edinburgh Cellular communications system
JP2008039222A (en) * 2006-08-02 2008-02-21 Sumitomo Heavy Ind Ltd Oil separator and compressor for cold storage unit-type refrigerating machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0829970A2 (en) * 1996-09-09 1998-03-18 Matsushita Electric Industrial Co., Ltd. Dual mode transceiver for TDMA and FDD modes
CN2558165Y (en) * 2002-04-25 2003-06-25 信息产业部电子第五十四研究所 All digital eight-diversity multi-rate compatible modem
CN1538640A (en) * 2003-01-29 2004-10-20 ���ǵ�����ʽ���� Wireless communication system and method for offering hybrid duplexing technology
CN2622968Y (en) * 2003-05-23 2004-06-30 厦门厦华特力通科技有限公司 Shift converter of straight base station
WO2005060182A1 (en) * 2003-12-18 2005-06-30 The University Court Of The University Of Edinburgh Cellular communications system
JP2008039222A (en) * 2006-08-02 2008-02-21 Sumitomo Heavy Ind Ltd Oil separator and compressor for cold storage unit-type refrigerating machine

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Assignee: Quanzhou Z-Stone Technology Co., Ltd.

Assignor: Lin Zhihua

Contract fulfillment period: 2008.3.5 to 2018.3.5

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Denomination of invention: TD-SCDMA field strength covering transmission method

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