CN102523012A - Wireless communication transceiver system - Google Patents
Wireless communication transceiver system Download PDFInfo
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- CN102523012A CN102523012A CN2011104222731A CN201110422273A CN102523012A CN 102523012 A CN102523012 A CN 102523012A CN 2011104222731 A CN2011104222731 A CN 2011104222731A CN 201110422273 A CN201110422273 A CN 201110422273A CN 102523012 A CN102523012 A CN 102523012A
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- duplexer
- pass filter
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- processing circuit
- filter
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Abstract
The invention discloses a wireless communication transceiver system. The wireless communication transceiver system comprises a wireless transceiver unit, a receiving processing unit, a sending processing unit, a duplexer and a transceiver antenna, wherein both the receiving processing circuit and the sending processing circuit are connected with the duplexer; and the duplexer is connected with the transceiver antenna to receive and send the wireless signal; a sending access of the duplexer is a low-pass filter which can improve insertion loss, so that the power consumption is saved, simultaneously, the maximum power to be output by a power amplifier in the receiving processing circuit and the sending processing circuit is reduced, thus the terminal heat dissipation is reduced.
Description
Technical field
The present invention relates to wireless communication field, especially a kind of radio communication receive-transmit system that adopts double antenna.
Background technology
What adopted at existing 3G/4G FDD (FDD) terminal is full-duplex implementation, therefore receives and dispatches path and can work simultaneously.In traditional radio architectures, duplexer (Duplex) equipment that is absolutely necessary, its significant feature is: (1) will receive and dispatch path and converge and merge into one the tunnel; (2) isolation of receiving and dispatching between the path is provided, i.e. the radiofrequency signal of decay emission path is disturbed the reception signal at the noise that receives frequency range to prevent it.
Why will between the transmitting-receiving path, isolation be provided, be (to be typically now-110dBm) also can work under very faint situation because receive the path requirement.And the emission path is the high power path, can reach the intensity of 28dBm.Because radio system is non-linear, under the main ripple situation of 28dBm, it is outer spuious to certainly exist very strong band.If these are spuious to receive that frequency range is not isolated then direct feed-in receiving terminal, its intensity will be higher than useful reception signal, thereby finally influence receptivity.
Typical FD D mobile terminal radio frequency structure is as shown in Figure 1, is example with WCDMA FDD terminal below, analyzes the design of its receiving system:
The typical receiving sensitivity in existing WCDMA terminal is-110dBm.
Wherein the power of DPDCH (Dedicated Physical Data Channel, Dedicated Physical Data Channel) is-120.3dBm;
The channel coding rate that is used for the WCDMA sensitivity test is 12.2kbps, its coding gain: 10Xlg (3.84MHz/12.2)=25dB.
The QPSK modulation system decoding threshold of WCDAMA is: 5.2dB, and needs are reserved the surplus of 2dB, and therefore requiring the demodulation module input signal-to-noise ratio is 7.2dB.
Therefore the noise at the demodulation module input should be lower than :-120.3+25-7.2=-102.5dBm/3.84MHz=-168.343dBm/Hz;
Consider that the receiver noise index is typically 5dB, therefore require the noise of demodulation module input should be lower than-173.343dBm/Hz.
And the thermal noise KBT=-200+26.022=-173.977dBm/Hz=-108.13dBm/3.84MHz of system;
Wherein, K (Boltzmann constant)=1.38x10-20mJ/K, B=3.84MHz (65.843dB), T=290K.
Existing typical amplifier output noise is :-160dBm/Hz (radio receiving-transmitting unit output)+28dB (amplifier is at the typical gain amplifier that receives frequency range)=-132dBm/Hz=-66.16dBm/3.84MHz.
Therefore typical duplexer need provide the isolation of 173.343-132=41dB at least; So big isolation is provided, thus the insertion loss of existing duplexer (Insertion Loss, IL) bigger; Especially high frequency and transmitting-receiving frequency range are near under the situation, and the insertion loss is very big.
Other sees also shown in Figure 2, is the filter characteristic figure of existing typical WCDMA Band2 duplexer emission path, and as can be seen from the figure the emission path of duplexer is actual is a band pass filter; And this band pass filter also provides filter effect in the frequency range lower than transmit frequency band; The existing duplexer of this kind is to use surface acoustic wave techniques to realize, it inserts loss more than 2.5dB, and main cause is that transmit frequency band is at 1850MHz-1910MHz; And receive frequency range at 1930-1990MHz; Requirement is done the center at 1950MHz, and transition band has only the band pass filter of 20MHz, and its difficulty is very big.
And so big insertion loss meeting brings following problem:
(1) power consumption problem: inserting under the big situation of loss, enough for the power of exporting, amplifier must promote power output, and power consumption must increase.
(2) heat dissipation problem: the power amplifier power output increases, and power consumption increases, and will inevitably produce bigger heat.The power amplifier heating at existing WCDMA terminal is very big, can influence battery and user experience.
(3) cost problem: its cost of device that technical indicator is high must rise, thereby causes the cost of whole terminal to rise.
Summary of the invention
In order to improve this situation, the invention provides a kind of radio communication receive-transmit system, cause into the big problem of loss because of using duplexer in order to solve prior art.
For realizing above-mentioned purpose; The radio communication receive-transmit system of embodiment of the present invention comprises wireless transmit/receive units, receiving processing circuit, emission treatment circuit, duplexer and dual-mode antenna; Wherein receiving processing circuit all is connected with duplexer with the emission treatment circuit; And duplexer is connected with dual-mode antenna to receive and the emission wireless signal, and wherein the emission path of this duplexer is a low pass filter.
According to above-mentioned principal character, this low pass filter is multistage choke-condenser filter.
According to above-mentioned principal character, all inductance of this multistage choke-condenser filter are series connection, and all electric capacity are parallel form.
According to above-mentioned principal character, the internal resistance of this low pass filter is 50 ohm.
Compared with prior art; The filtering framework that the present invention adopts low pass filter to design the emission path can obviously improve the insertion loss; Reduced the insertion loss of system; Thereby reach the purpose of saving energy, also reduced the maximum power that the power amplifier in receiving processing circuit and the emission treatment circuit need be exported simultaneously, thereby reached the purpose that reduces heat dissipation of terminal.
Description of drawings
Fig. 1 is typical FDD mobile terminal radio frequency structure chart.
Fig. 2 is the filter characteristic figure of existing typical WCDMA Band2 duplexer emission path.
Fig. 3 is the functional frame composition of the radio communication receive-transmit system of embodiment of the present invention.
Fig. 4 is the circuit diagram of the low pass filter of Band IV.
Fig. 5 is the frequency response curve of the low pass filter of Band IV shown in Figure 4.
Fig. 6 is the circuit diagram of the low pass filter of Band I.
Fig. 7 is the frequency response curve of the low pass filter of Band I shown in Figure 6.
Fig. 8 is the low-pass filter circuit figure of Band II.
Fig. 9 is the frequency response curve of the low pass filter of Band II.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the invention is described.
See also shown in Figure 3; It is the functional frame composition of the radio communication receive-transmit system of embodiment of the present invention; The radio communication receive-transmit system comprises wireless transmit/receive units 10, receiving processing circuit 11, emission treatment circuit 12, duplexer 13 and dual-mode antenna 14; Wherein receiving processing circuit 11 all is connected with duplexer 13 with emission treatment circuit 12, and duplexer 13 is connected with dual-mode antenna 14 to receive and the emission wireless signal.Because of the present invention relates generally to the improvement of duplexer 13, following emphasis describes the improvements of duplexer 13, and the structure of other elements and function in the prior art more has description, repeats no more here.
In the specific implementation, the emission path of this duplexer 13 is a low pass filter.Preferably, this low pass filter is multistage choke-condenser filter.
See also shown in Figure 4ly, be the low-pass filter circuit figure of Band IV, this low pass filter is multistage choke-condenser filter, and the left side is an emission source, and internal resistance is 50 ohm.It is 1750MHz by frequency, and the transmit frequency band that guarantees frequency range IV is in the filter passband scope.The all inductance of this filter are series connection, and all electric capacity are parallel form.Fig. 5 is the frequency response curve of the low pass filter of Band IV shown in Figure 4, and wherein abscissa is represented frequency, and scope is from 1.5GHz to 2.2GHz.Loss is inserted in ordinate representative, every lattice 10dB, and (the insertion loss of 1710MHz～1755MHz) is less than 0.1dB, and (2110～2170MHz) decay can reach 60dB to receiving frequency range at the transmit frequency band of Band IV can to see above-mentioned filter.
See also shown in Figure 6ly, be the circuit diagram of the low pass filter of Band I, this filter is multistage choke-condenser filter, and the left side is an emission source, and internal resistance is 50 ohm, and it is 1980MHz by frequency, and the transmit frequency band that guarantees frequency range I is in the filter passband scope.All inductance are series connection, and all electric capacity are parallel form.Fig. 7 is the frequency response curve of the low pass filter of Band I shown in Figure 6; Wherein abscissa is represented frequency; Scope is from 1.8GHz to 2.6GHz, and loss, every lattice 8dB are inserted in the ordinate representative; (the insertion loss of 1920MHz～1980MHz) is less than 0.5dB, and (2110～2170MHz) decay can reach 60dB to receiving frequency range at the transmit frequency band of Band I can to see above-mentioned filter.
See also shown in Figure 8ly, be the low-pass filter circuit figure of Band II, above-mentioned filter is multistage choke-condenser filter, and the left side is an emission source, and internal resistance is 50 ohm, and it is 1910MHz by frequency, and the transmit frequency band that guarantees frequency range II is in the filter passband scope.All inductance are series connection, and all electric capacity are parallel form.Fig. 9 is the frequency response curve of the low pass filter of Band II; Abscissa is represented frequency; Scope is represented from 1.8GHz to the 2GHz. ordinate and is inserted loss; Every lattice 5dB can see that (the insertion loss of 1850MHz～1910MHz) is no more than 1.3dB to above-mentioned filter, and (1930～1990MHz) decay can reach 48dB to receiving frequency range at the transmit frequency band of Band IV.
Can find out by above explanation; The filtering framework that the present invention adopts low pass filter to design the emission path can obviously improve Insertion Loss; Reduced system's Insertion Loss; Thereby reach the purpose of saving energy, also reduced the maximum power that the power amplifier in receiving processing circuit and the emission treatment circuit need be exported simultaneously, thereby reached the purpose that reduces heat dissipation of terminal.
Above explanation is to be that example describes with multistage choke-condenser filter, and present technique field personnel Ying Zhi can also have other forms of low pass filter, here explanation no longer one by one.
It is understandable that, concerning those of ordinary skills, can be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the present invention.
Claims (4)
1. radio communication receive-transmit system; Comprise wireless transmit/receive units, receiving processing circuit, emission treatment circuit, duplexer and dual-mode antenna; Wherein receiving processing circuit all is connected with duplexer with the emission treatment circuit; And duplexer is connected with dual-mode antenna to receive and the emission wireless signal, and it is characterized in that: the emission path of this duplexer is a low pass filter.
2. radio communication receive-transmit system as claimed in claim 1 is characterized in that: this low pass filter is multistage choke-condenser filter.
3. radio communication receive-transmit system as claimed in claim 2 is characterized in that: all inductance of this multistage choke-condenser filter are series connection, and all electric capacity are parallel form.
4. radio communication receive-transmit system as claimed in claim 1 is characterized in that: the internal resistance of this low pass filter is 50 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104222731A CN102523012A (en) | 2011-12-15 | 2011-12-15 | Wireless communication transceiver system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104222731A CN102523012A (en) | 2011-12-15 | 2011-12-15 | Wireless communication transceiver system |
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| CN102523012A true CN102523012A (en) | 2012-06-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104620501A (en) * | 2012-09-11 | 2015-05-13 | 高通股份有限公司 | Filters for multi-band wireless device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2456421Y (en) * | 2000-08-15 | 2001-10-24 | 深圳市中兴通讯股份有限公司 | Front terminal receiving/transmitting device |
| US20020186757A1 (en) * | 2001-02-27 | 2002-12-12 | Hiroyuki Nakamura | Antenna duplexer and mobile communication device using the same |
| CN102100006A (en) * | 2008-04-11 | 2011-06-15 | 日本电波工业株式会社 | Duplexer |
| CN102204110A (en) * | 2008-10-29 | 2011-09-28 | 高通股份有限公司 | Interface for wireless communication devices |
-
2011
- 2011-12-15 CN CN2011104222731A patent/CN102523012A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2456421Y (en) * | 2000-08-15 | 2001-10-24 | 深圳市中兴通讯股份有限公司 | Front terminal receiving/transmitting device |
| US20020186757A1 (en) * | 2001-02-27 | 2002-12-12 | Hiroyuki Nakamura | Antenna duplexer and mobile communication device using the same |
| CN102100006A (en) * | 2008-04-11 | 2011-06-15 | 日本电波工业株式会社 | Duplexer |
| CN102204110A (en) * | 2008-10-29 | 2011-09-28 | 高通股份有限公司 | Interface for wireless communication devices |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104620501A (en) * | 2012-09-11 | 2015-05-13 | 高通股份有限公司 | Filters for multi-band wireless device |
| US9692392B2 (en) | 2012-09-11 | 2017-06-27 | Qualcomm Incorporated | Filters for multi-band wireless device |
| CN104620501B (en) * | 2012-09-11 | 2018-07-13 | 高通股份有限公司 | Filter for multi-band wireless equipment |
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Application publication date: 20120627 |