CN1731692A - Dual-mode communication terminal capable of restraining two mode signal RF crosstalk interference and restraining method - Google Patents
Dual-mode communication terminal capable of restraining two mode signal RF crosstalk interference and restraining method Download PDFInfo
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- CN1731692A CN1731692A CNA2005100286283A CN200510028628A CN1731692A CN 1731692 A CN1731692 A CN 1731692A CN A2005100286283 A CNA2005100286283 A CN A2005100286283A CN 200510028628 A CN200510028628 A CN 200510028628A CN 1731692 A CN1731692 A CN 1731692A
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Abstract
The invention discloses a dual mode communication terminal for suppression dual mode signal RF interference which comprises a first base band processing module, a first interference control module, a second base band processing module and a second interference control module. The first interference control module comprises a first private interference compressing channel and a first non-private interference-compressing channel. The second interference control module comprises a second private interference compressing channel and a second non-private interference-compressing channel. When the first base band processing module detects that in terminal the second mode signal affecting the first mode signal's receiving, the first interference control module selects the first private interference compressing channel to compress the second mode signal. When the second base band processing module detects that in terminal the first mode signal affecting the second mode signal's receiving, the second interference control module selects the second private interference compressing channel to compress the first mode signal.
Description
[technical field]
The present invention relates to the communication terminal in a kind of mobile communication system, relate in particular to a kind of double-mode communication terminal that can be applicable to two kinds of different communication modes simultaneously.
[background technology]
As everyone knows, the three big standards in leading current cellular mobile communication market are respectively TDMA (time division multiple access), CDMA (code division multiple access) and GSM (global system for mobile communications) standard, be referred to as the second generation (2G) digital mobile communication standard, then be collectively referred to as the third generation (3G) digital mobile communication standard as CDMA2000, TDS-CDMA (time-division switching-code division multiple access) and the WCDMA (Wideband Code Division Multiple Access (WCDMA)) on basis with CDMA technology.Compare with regard to GSM and cdma system that China goes ahead of the rest, GSM network frequency range height, the signal penetration capacity is strong; And the power system capacity of cdma network is big, frequency efficiency is high, anti-interference and anti-ageing power consumption power strong, good confidentiality, and suitable high speed data transfers, obviously has more obvious advantage than gsm system, it is as the special status of third generation digital mobile communication standard base in addition, and cdma system will progressively replace gsm system.However, cdma system replaces gsm system and needs a long-term process, and in the quite a long time, cdma system and gsm system all will exist jointly.In recent years along with increase in demand, also obtained developing rapidly based on WiFi (public access wireless LAN) equipment of IEEE (Institute of Electrical and Electronics Engineers) 802.11x (a/b/g) technology to the higher rate data service.
In numerous standards and network coexisted today, can be applied at least two communication systems, be applicable to that the double-mode communication terminal of at least two kinds of communication patterns can provide smooth excessiveness for the differentiation of each communication system of coexistence.The user who uses double-mode communication terminal not only can be easily adopt different system all over the world between roam, and according to the speech quality and the charging way of different system switch at any time better, more cheap network.We can say that double-mode communication terminal combines all advantages of two kinds of network technologies, therefore have very big market prospects.
Now more common on the market double-mode communication terminal has two kinds, a kind ofly is equipped with two draw-in grooves, for inserting two cards that are applicable to two kinds of communication patterns respectively; Another kind only is equipped with a draw-in groove, for inserting one " bimodulus card ".All there is a problem in above-mentioned two kinds of double-mode communication terminals, and promptly two kinds of communication patterns can not be simultaneously at net, and arbitrary moment can only be chosen a kind of pattern work in two patterns, and another kind of pattern is in closed condition.Causing so probably that incoming call is lost, transfer of data interruption etc., making troubles for user's use.
Some developers are at the problems referred to above, actively research and development can be under two kinds of patterns simultaneously at the double-mode communication terminal of net.Chinese patent discloses No. 1604674 and has promptly disclosed a kind of like this double-mode communication terminal.This double-mode communication terminal comprises that one has the single mode communication terminal of support master communication pattern of standard expansion slot and the subsidiary communications module card of the support subsidiary communications pattern inserted by expansion slot.By the effect of mode select signal, this double-mode communication terminal is selectable to be operated in following state: bimodulus standby master mould is preferential, preferential, the single main mould standby of the auxilliary mould of bimodulus standby and Dan Fumo standby.When main mould and the standby simultaneously of auxilliary mould, the working frequency range of the two kinds of mode signals distance of being separated by no matter, because single mode communication terminal and subsidiary communications module card are positioned at same housing, and the dual-mode antenna of two-mode is separated by nearerly, therefore all is difficult to avoid two kinds of radio frequency cross between the mode signal to disturb.
With the CDMA/GSM pattern is example, and the radio frequency cross of above-mentioned two kinds of mode signals is disturbed the following four kinds of situations that mainly comprise:
When (1) GSM launched, GSM transmitted to the interference of CDMA received signal;
When (2) CDMA launched, CDMA transmitted to the interference of GSM received signal;
(3) GSM emission, reception and idle condition, the interference that spurious emissions signal (spurious emissions) receives CDMA;
(4) CDMA emission, reception and idle condition, the interference that the spurious emissions signal receives GSM.
In above-mentioned four kinds of situations, for (3), (4), because the spurious emissions signal is with respect to useful signal, transmitting power is very little, and the interference that causes is also very little, so do not do consideration in patent of the present invention.For (1),, can cause the CDMA weak signal to be fallen into oblivion by the strong signal of GSM when the GSM transmit signal strength that arrives cdma receiver during far above the cdma base station transmit signal strength.The interference that GSM transmits to the CDMA received signal can cause that cdma receiver increases the demodulation bit error rate of the useful weak signal of CDMA, and promptly the CDMA receiving sensitivity descends.For (2),, can cause the GSM weak signal to be fallen into oblivion by the strong signal of CDMA when the CDMA transmit signal strength that arrives the GSM receiver during far above GSM base station transmit signals intensity.The interference that CDMA transmits to the GSM received signal can cause that the GSM receiver increases the demodulation bit error rate of the useful weak signal of GSM, and promptly the GSM receiving sensitivity descends.Therefore, in the design of double-mode communication terminal, how to suppress a kind of pattern problem that interference to another kind of pattern received signal becomes to attach most importance to and will solve that transmits.
[summary of the invention]
One of purpose of the present invention is to provide a kind of double-mode communication terminal at above-mentioned the deficiencies in the prior art, and this double-mode communication terminal is applicable to first and second communication pattern, and the radio frequency cross that can suppress between first and second mode signal is disturbed.
Two of purpose of the present invention is to provide a kind of method that radio frequency cross is disturbed between first and second mode signal in the double-mode communication terminal that suppresses.
One of for achieving the above object, the present invention adopts following technical scheme: the present invention can suppress the double-mode communication terminal of two kinds of mode signal RF cross interference, applicable to first and second communication pattern, it comprises first communication unit that first communication pattern is provided and the second communication unit that the second communication pattern is provided.First receiver rf front-end of first communication unit and the radio frequency between first duplexer receive link and are provided with the first Interference Control module, it comprises that first special-purpose the interference suppress path and first non-special-purpose the interference suppressed path, and the first Interference Control module selectively suppresses path or first non-special-purpose the interference suppressed path and inserted first radio frequency and receive link with first special-purpose the interference under the control of first control signal that first baseband processing module of first communication unit is provided.Second receiver rf front-end of second communication unit and the radio frequency between second duplexer receive link and are provided with the second Interference Control module, it comprises that second special-purpose the interference suppress path and second non-special-purpose the interference suppressed path, and the second Interference Control module selectively suppresses path or second non-special-purpose the interference suppressed path and inserted second radio frequency and receive link with second special-purpose the interference under the control of second control signal that second baseband processing module of second communication unit is provided.
For achieving the above object two, the present invention adopts following technical scheme: the present invention suppresses the method that radio frequency cross is disturbed between interior first mode signal of double-mode communication terminal and second mode signal and comprises the steps: to provide the first Interference Control module on the reception of the radio frequency between first receiver rf front-end and first duplexer link, and this Interference Control module comprises that the alternative first special-purpose interference inhibition path and the first non-special-purpose interference suppress path; Provide the second Interference Control module on the reception of second radio frequency between second receiver rf front-end and second duplexer link, this Interference Control module comprises that the alternative second special-purpose interference suppresses path and the second non-special-purpose interference suppresses path; First baseband processing module judges that second pattern transmits to the disturbed condition of the first pattern received signal in the double-mode communication terminal, if be judged as to exist to disturb and maybe may have interference, then first baseband processing module sends first control signal to the first Interference Control module, and the first Interference Control module inserts first radio frequency reception link with the first special-purpose inhibition path that disturbs; Noiseless as if being judged as, then the first Interference Control module inserts first radio frequency reception link with the first non-special-purpose inhibition path that disturbs; Second baseband processing module judges that first pattern transmits to the disturbed condition of the second pattern received signal in the double-mode communication terminal; Exist interference maybe may have interference if be judged as, then second baseband processing module sends second control signal to the second Interference Control module, and the second Interference Control module suppresses path with the second special-purpose interference and inserts radio frequency reception link; Noiseless as if being judged as, then the second Interference Control module inserts second radio frequency reception link with the second non-special-purpose inhibition path that disturbs.
Compared with prior art, double-mode communication terminal of the present invention has reduced the interference of the radio frequency cross between the two-mode signal when working in two kinds of patterns simultaneously effectively, especially suppressed transmitting of a kind of pattern, thereby guaranteed the normal reception of double-mode communication terminal the interference of another pattern received signal.
[description of drawings]
Fig. 1 is a double-mode communication terminal of the present invention when being applied to GSM and CDMA pattern, and it is in GSM and cdma base station and intersects schematic diagram in the coverage.
Fig. 2 is an embodiment of double-mode communication terminal of the present invention, promptly uses the internal structure schematic diagram of the double-mode communication terminal of two dual-mode antennas.
Fig. 3 is another embodiment of double-mode communication terminal of the present invention, promptly uses the internal structure schematic diagram of the double-mode communication terminal of a dual-mode antenna.
Fig. 4 is the block diagram of the first Interference Control module of double-mode communication terminal of the present invention.
Fig. 5 is the first special-purpose schematic diagram that disturbs a frequency response that suppresses path of double-mode communication terminal of the present invention.
Fig. 6 a is the first special-purpose CDMA useful signal of inhibition path input and a kind of combination schematic diagram of GSM interference signal of disturbing of double-mode communication terminal of the present invention.
Fig. 6 b is that the signal combination among Fig. 6 a is passed through the output signal combination schematic diagram after the first special-purpose interference suppresses path.
Fig. 7 a is the first special-purpose CDMA useful signal of inhibition path input and the another kind combination schematic diagram of GSM interference signal of disturbing of double-mode communication terminal of the present invention.
Fig. 7 b is that the signal combination among Fig. 7 a is passed through the output signal combination schematic diagram after the first special-purpose interference suppresses path.
Fig. 8 is the block diagram of the second Interference Control module of double-mode communication terminal of the present invention.
[embodiment]
The alleged double-mode communication terminal of the present invention is meant the communication terminal that is applicable to two different communication patterns, and these two kinds of communication patterns can be the combinations of any two kinds of patterns of GSM, CDMA, TDMA, WCDMA, TDS-CDMA, CDMA2000, WiFi and Personal Handyphone System(PHS) PHS pattern etc.
Please refer to shown in Figure 2, Fig. 2 is the internal structure schematic diagram of double-mode communication terminal 1 first embodiment of the present invention, this double-mode communication terminal 1 comprises between first relatively independent communication unit 20 and 10, two unit 10,20, second communication unit and can communicate by principal and subordinate's control system (not shown).Described first communication unit 20 comprises first mode antenna 21, be used to isolate first duplexer 22 that transmits and receives signal, be used to handle the emission of first pattern, first baseband processing module 26 of receiving baseband signal, being arranged at first radio frequency between first baseband processing module 26 and first duplexer 22 receives and to be used to handle first receiver rf front-end 24 from first mode signal of first base station on the link (not label), being connected in being used between first baseband processing module 26 and first duplexer 22 launches the first radio-frequency transmissions circuit 25 of first mode signal, and is arranged at the first Interference Control module 23 between first receiver rf front-end 24 and first duplexer 22.Described second communication unit 10 comprises second mode antenna 11, be used to isolate second duplexer 12 that transmits and receives signal, be used to handle the emission of second pattern, second baseband processing module 16 of receiving baseband signal, being arranged at second radio frequency between second baseband processing module 16 and second duplexer 12 receives and to be used to handle second receiver rf front-end 14 from second mode signal of second base station on the link (not label), being connected in being used between second baseband processing module 16 and second duplexer 12 launches the second radio-frequency transmissions circuit 15 of second mode signal, and is arranged at the second Interference Control module 13 between second receiver rf front-end 14 and second duplexer 12.
First baseband processing module 26 receives the second radio-frequency transmissions link enable signal from the second radio-frequency transmissions circuit 16 as the communications conduit of first communication unit 20 and second communication unit 10, and, send first control signal and give first receiver rf front-end 24 and the first Interference Control module 23 according to the signal disturbed condition in the double-mode communication terminal 1 that monitors.24 pairs of receptions of first receiver rf front-end from first mode signal of first base station amplify, mixing, and adjust gain mode according to first control signal that first baseband processing module 26 is sent, optimize the receptivity of first pattern.Second baseband processing module 16 receives the first radio-frequency transmissions link enable signal from the first radio-frequency transmissions circuit 25 as the communications conduit of the second communication unit 10 and first communication unit 20, and, send second control signal and give second receiver rf front-end 14 and the second Interference Control module 13 according to the signal disturbed condition in the double-mode communication terminal 1 that monitors.14 pairs of receptions of second receiver rf front-end from second mode signal of second base station amplify, mixing, and adjust gain mode according to second control signal that second baseband processing module 16 is sent, optimize the receptivity of second pattern.Above-mentioned first baseband processing module 26 and second baseband processing module 16 are two relatively independent modules in the present embodiment, but in other embodiments, this two module also can be synthesized in same baseband processing module, or shared a part of baseband processing circuitry (as D/A converting circuit and analog to digital conversion circuit etc.), it or not emphasis of the present invention herein, it only is described, no longer describes in detail.
Please refer to shown in Figure 3, Fig. 3 is the internal structure schematic diagram of double-mode communication terminal 1 ' second embodiment of the present invention, the structure of the double-mode communication terminal 1 among this double-mode communication terminal 1 ' and Fig. 2 is basic identical, difference only is first communication unit and antenna 101 of second communication units shared, and inserts an antenna multicoupler 102 between this antenna and first communication unit and second communication unit.
For convenience of description, below in conjunction with preferred embodiment of the present invention, be that example describes only, promptly in the following description with the double-mode communication terminal 1 that is applicable to CDMA and GSM pattern, above-mentioned first communication pattern is specially the CDMA pattern, the second communication pattern is specially the GSM pattern.When Fig. 1 is applied to GSM and CDMA two-mode for double-mode communication terminal 1 of the present invention, it has been in two base stations of CDMA and GSM simultaneously and has intersected schematic diagram in the coverage, and this double-mode communication terminal 1 is selectable to work in a kind of in double mode of single GSM pattern, single CDMA pattern or CDMA/GSM.Wherein, this double-mode communication terminal of the double mode expression of CDMA/GSM under CDMA and GSM two-mode simultaneously at net.Herein " at net " comprises standby and communications status, and communications status be meant the transmitting-receiving note, connect make a phone call, transfer of data and enjoy the active state that other value-added services etc. take network.
When double-mode communication terminal 1 simultaneously away from GSM base station and cdma base station, and when 10 emissions of second communication unit, 20 receptions of first communication unit, in order to communicate by letter with the GSM base station maintain, double-mode communication terminal 1 will be with bigger power emission GSM signal, again since double-mode communication terminal 1 away from cdma base station, arrive CDMA signal strength signal intensity that first radio frequency receives link a little less than, may produce interference to the CDMA received signal so GSM transmits.Inside at double-mode communication terminal 1, the CDMA useful signal that is received from cdma base station enters first radio frequency by first mode antenna 21 and first duplexer 22 and receives link, and GSM transmits can be by second mode antenna 11 be transmitted into and goes in the space, because first mode antenna 21 is very near from second mode antenna 11, having very strong GSM transmits and is coupled to first duplexer 22 by first mode antenna, enter into first radio frequency again and receive link, thereby the CDMA useful signal that is in equally on first radio frequency reception link is formed interference (the following GSM signal that will enter first radio frequency reception link abbreviates " GSM interference signal " as).
When double-mode communication terminal 1 simultaneously away from GSM base station and cdma base station, and when 20 emissions of first communication unit, 10 receptions of second communication unit, communicate by letter in order to keep with cdma base station, double-mode communication terminal 1 will be with bigger power emission CDMA signal, again since double-mode communication terminal 1 away from the GSM base station, arrive GSM signal strength signal intensity that second radio frequency receives link a little less than, may produce interference to the GSM received signal so CDMA transmits.Inside at double-mode communication terminal 1, the GSM useful signal that is received from the GSM base station enters second radio frequency by second mode antenna 11 and second duplexer 12 and receives link, and CDMA transmits can be by first mode antenna 21 be transmitted into and goes in the space, because first mode antenna 21 is very near from second mode antenna 11, having very strong CDMA transmits and is coupled to second duplexer 12 by second mode antenna, enter into second radio frequency again and receive link, thereby the GSM useful signal that is in equally on second radio frequency reception link is formed interference (the following CDMA signal that will enter second radio frequency reception link abbreviates " CDMA interference signal " as).
See also shown in Figure 4ly, the first Interference Control module 23 comprises that first special-purpose the interference suppress path 232, first non-special-purpose the interference and suppress path 234 and two radio-frequency mass spectrometers 231,233.The stiff end of two radio-frequency mass spectrometers 231,233 is electrically connected to first receiver rf front-end 24 and first duplexer 22 respectively, and free end then can suppress to switch between the path 234 at the first special-purpose interference inhibition path 232 and first non-special-purpose the interference.First special-purpose 232 in the inhibition path that disturbs allows the CDMA useful signal to pass through, and suppresses GSM interference signal (back will be described in detail in conjunction with Fig. 5-7b).First baseband processing module 26 is judged the signal disturbed condition in the double-mode communication terminals 1, and selects whether to send first control signal to the first Interference Control module 23 according to annoyance level.When on being judged as first radio frequency reception link, not having GSM interference signal or GSM interference signal more weak, two radio-frequency mass spectrometers 231,233 are communicated with first non-special-purpose the interference all the time and suppress path 234, to reduce the influence of 23 pairs of CDMA receptivities of the first Interference Control module; When existing the GSM interference signal to have influence on the CDMA receptivity on being judged as CDMA radio frequency reception link, 231,233 of two radio-frequency mass spectrometers suppress path 232 with the first special-purpose interference and insert first radio frequency reception link, to suppress the GSM interference signal.First baseband processing module 26 also can send to first control signal first receiver rf front-end, 24, the first receiver rf front-ends 24 and adjust gain mode under the control of first control signal, optimizes the CDMA receptivity.
See also shown in Figure 8ly, the second Interference Control module 13 comprises that second special-purpose the interference suppress path 132, second non-special-purpose the interference and suppress path 134 and two radio-frequency mass spectrometers 131,133.The stiff end of two radio-frequency mass spectrometers 131,133 is electrically connected to second receiver rf front-end 14 and second duplexer 12 respectively, and free end then can suppress to switch between the path 134 at the second special-purpose interference inhibition path 132 and second non-special-purpose the interference.Second special-purpose 132 in the inhibition path that disturbs allows the GSM useful signal to pass through, and suppresses the CDMA interference signal.Second baseband processing module 16 is judged the signal disturbed condition in the double-mode communication terminals 1, and selects whether to send second control signal to the second Interference Control module 13 according to annoyance level.When on being judged as second radio frequency reception link, not having CDMA interference signal or CDMA interference signal more weak, two radio-frequency mass spectrometers 131,133 are communicated with second non-special-purpose the interference all the time and suppress path 134, to reduce the influence of 13 pairs of GSM receptivities of the second Interference Control module; When existing the CDMA interference signal to have influence on the GSM receptivity on being judged as GSM radio frequency reception link, 131,133 of two radio-frequency mass spectrometers suppress path 132 with the second special-purpose interference and insert second radio frequency reception link, to suppress the CDMA interference signal.Second baseband processing module 16 also can send to second control signal second receiver rf front-end, 14, the second receiver rf front-ends 14 and adjust gain mode under the control of second control signal, optimizes the GSM receptivity.
Because second baseband processing module 16 is basic identical for the judgement and the processing mode of GSM interference signal for the judgement of CDMA interference signal and processing mode and first baseband processing module 26, so, below only disturb the CDMA useful signal to receive with regard to the GSM interference signal the situation inhibition of setting forth 1 pair of GSM interference signal of double-mode communication terminal of the present invention.
Whether the judgement of 26 pairs of GSM interference signals of first baseband processing module is mainly effective according to its second radio-frequency transmissions link enable signal that monitors (being GSM radio-frequency transmissions link enable signal herein), and first radio frequency receive link (being CDMA radio frequency reception link herein) and whether work, but a reference factor is arranged also in addition, be that CDMA receives hardwood error rate (Frame Error Ratio, situation of change FER).Several different under net state at double-mode communication terminal 1, the judgement and the processing mode of 26 pairs of GSM interference signals of first baseband processing module can be divided into particularly but be not limited to following several situation:
A) the CDMA pattern of double-mode communication terminal 1 and GSM pattern are in holding state together, under this state, separately internet message of the independent respectively monitoring in first communication unit and second communication unit, handle registration, position renewal etc.Monitor GSM radio-frequency transmissions link enable signal when effective when the CDMA radio frequency receives link work and first baseband processing module 26, be judged as the interference that may exist stronger GSM emission that CDMA is received in this double-mode communication terminal 1.At this moment, first baseband processing module 26 can send first control signal and give the first Interference Control module 23, notify it that first special-purpose interference suppressed path 232 access CDMA radio frequencies reception links, to suppress the GSM interference signal, simultaneously first control signal is sent to first receiver rf front-end 24, make it adjust gain mode, optimize the CDMA receptivity.
B) the CDMA pattern of double-mode communication terminal 1 is in communications status, the GSM pattern is in holding state, under this state, when the CDMA radio frequency receive link work and first baseband processing module 26 monitor GSM radio-frequency transmissions link enable signal effectively (also can be simultaneously with reference to optional criterion: CDMA receive FER become influence communication quality greatly) time, be judged as and have the interference of stronger GSM emission in this double-mode communication terminal 1 the CDMA reception.At this moment, first baseband processing module 26 sends first control signal and gives the first Interference Control module 23, notify it that first special-purpose interference suppressed path 232 access CDMA radio frequencies reception links, to suppress the GSM interference signal, simultaneously first control signal is sent to first receiver rf front-end 24, make it adjust gain mode, optimize the CDMA receptivity.
C) the GSM pattern is in communications status in the double-mode communication terminal 1, the CDMA pattern is in holding state, under this state, monitor GSM radio-frequency transmissions link enable signal when effective when the CDMA radio frequency receives link work and first baseband processing module 26, then be judged as the interference that may exist stronger GSM emission that CDMA is received in this double-mode communication terminal 1.At this moment, first baseband processing module 26 sends first control signal and gives the first Interference Control module 23, notify it that first special-purpose interference suppressed path 232 access CDMA radio frequencies reception links, to suppress the GSM interference signal, simultaneously first control signal is sent to first receiver rf front-end 24, make it adjust gain mode, optimize the CDMA receptivity.
When d) the GSM pattern does not have emission or GSM radio-frequency transmissions link enable signal and is invalid (closing emission) in the double-mode communication terminal 1, be judged as and do not have the interference of GSM emission in this double-mode communication terminal 1 the CDMA reception.When the CDMA radio frequency received link work, the first Interference Control module 23 inserted radio frequency with the first non-special-purpose interference inhibition path 234 and receives link, to reduce the influence that 23 couples of CDMA of the first Interference Control module receive, optimization CDMA receptivity.
As seen from the above analysis, no matter being judged as " exist and disturb " still is " may have interference ", and first baseband processing module 26 all can send first control signal, and the first Interference Control module 23 all can be connected first special-purpose the interference and suppress path 232.
When CDMA in the double-mode communication terminal 1 transmits when the GSM useful signal produce disturbed, judge and the processing mode principle on transmit with GSM all that the CDMA useful signal is produced judgement and the processing mode disturbed is identical, so much more no longer state.
First special-purpose disturb suppress that path 232 can be that low pass, band are logical, high pass or stop-band filter.Fig. 5 shows first a special-purpose frequency response of disturbing when suppressing path 232 for band pass filter.First special-purpose the interference in the design that suppresses path 232 in reality, need be according to the CDMA in country variant, area and the frequency planning of GSM, specifically use configuring condition, concrete analysis GSM/CDMA disturbed condition, select and design the corresponding radio-frequency mass spectrometer 231,233 and the first special-purpose inhibition path 232 that disturbs, with inhibition GSM interference signal, and make its insertion loss as far as possible little to the CDMA received signal.
The frequency of GSM interference signal may be higher or lower than the CDMA useful signal, but with respect to the CDMA broadband signal, the GSM interference signal is generally a narrow band signal.Fig. 6 a and 7a are illustrated in the first special-purpose input that suppresses path 232 that disturbs respectively, the two kinds of GSM interference signals when GSM interference signal frequency is lower than and is higher than the CDMA useful signal and the signal combination of CDMA useful signal.Corresponding, Fig. 6 b and 7b illustrate respectively these two kinds of signal combination by first special-purpose disturb suppress path 232 after, the signal combination that records in output.By Fig. 6 a-7b as can be seen, frequency size regardless of GSM interference signal and CDMA useful signal, the GSM interference signal all can be decayed significantly, and the CDMA useful signal can finely be passed through the first special-purpose inhibition path 232 that disturbs after disturbing inhibition path 232 by first special use.
Though the just the present invention who more than provides is applied to the preferred embodiment of CDMA/GSM pattern, can not limit scope of the invention process with this.Double-mode communication terminal of the present invention disturbs at first mode signal of terminal inner generation and the radio frequency cross of second mode signal when working simultaneously at two kinds of patterns (first pattern, second pattern), introduce the Interference Control module, and do not limit its concrete application model.
The variation of the equalization that the those skilled in the art in the present technique field are done according to the present invention, for example each module of the present invention (circuit) is carried out function replacement or combination, discrete, and the known improvement of those skilled in that art, within the claim that all should still belong to patent of the present invention contains.
Claims (17)
1. double-mode communication terminal that can suppress two kinds of mode signal RF cross interference, this terminal is applicable to first and second communication pattern, it comprises first communication unit that first communication pattern is provided and the second communication unit that the second communication pattern is provided; It is characterized in that: first receiver rf front-end of first communication unit and first radio frequency between first duplexer receive link and are provided with the first Interference Control module, it comprises that first special-purpose the interference suppress path and first non-special-purpose the interference suppressed path, and the first Interference Control module selectively suppresses path or first non-special-purpose the interference suppressed path and inserted described first radio frequency and receive link with first special-purpose the interference under the control of the control signal that first baseband processing module of first communication unit is provided.
2. double-mode communication terminal as claimed in claim 1, it is characterized in that: described first baseband processing module electrically connects with the first Interference Control module by first radio-frequency front-end, and first baseband processing module is controlled the first Interference Control module by first control signal; When first baseband processing module monitors in the double-mode communication terminal second mode signal when first mode signal is produced the interference effect first pattern receptivity, it sends control signal to the first Interference Control module, the first Interference Control module is selected the first special-purpose inhibition path access radio frequency that disturbs is received link, under all the other states, the first Interference Control module is all selected the first non-special-purpose inhibition path that disturbs is inserted first radio frequency reception link.
3. double-mode communication terminal as claimed in claim 2 is characterized in that: described second mode signal produce to disturb first mode signal and is meant that second pattern transmits and influences the reception of first mode signal.
4. double-mode communication terminal as claimed in claim 2, it is characterized in that: the described first Interference Control module also comprises two radio-frequency mass spectrometers, its stiff end is electrically connected to first receiver rf front-end and first duplexer respectively, and its free end is used for switching the connection first special-purpose interference inhibition path and the first non-special-purpose interference suppresses path.
5. double-mode communication terminal as claimed in claim 4 is characterized in that: described first special-purpose disturb suppress that path is that low pass, band are logical, high pass or band stop filter.
6. double-mode communication terminal as claimed in claim 2, it is characterized in that: described first baseband processing module and first radio-frequency front-end electrically connect, and first baseband processing module is controlled first receiver rf front-end by control signal, and first receiver rf front-end is adjusted its gain mode according to control signal.
7. double-mode communication terminal as claimed in claim 6, it is characterized in that: described second communication unit comprises with the electric connection of first baseband processing module and is used to handle second baseband processing module of the second pattern baseband signal and electrically connects second radio-frequency module that is used to launch, receive second mode signal with second baseband processing module that the second communication unit provides the second pattern radio-frequency transmissions link enable signal to produce described control signal as the reference signal for first baseband processing module.
8. double-mode communication terminal as claimed in claim 7 is characterized in that: described first baseband processing module and second baseband processing module have shared circuit.
9. double-mode communication terminal as claimed in claim 1 is characterized in that: first pattern and second pattern are any two kinds in PHS, GSM, CDMA2000, WCDMA, TD-SCDMA, the WiFi mode standard.
10. one kind is suppressed the method that radio frequency cross is disturbed between interior first mode signal of double-mode communication terminal and second mode signal, and this double-mode communication terminal comprises first baseband processing module that can handle the first pattern baseband signal, launch the first radio-frequency transmissions circuit of first mode signal, handle first receiver rf front-end of the first pattern received signal, first duplexer of isolating emission of first pattern and received signal, can handle second baseband processing module of the second pattern baseband signal, launch the second radio-frequency transmissions circuit of second mode signal, handle second receiver rf front-end of the second pattern received signal, second duplexer of isolating emission of second pattern and received signal; This method comprises the steps:
(1) provide the first Interference Control module on the reception of the radio frequency between first receiver rf front-end and first duplexer link, this first Interference Control module comprises that the alternative first special-purpose interference suppresses path and the first non-special-purpose interference suppresses path;
(2) first baseband processing modules judge that second pattern transmits to the disturbed condition of the first pattern received signal in the double-mode communication terminal;
(3) maybe may have interference if be judged as the existence interference, then first baseband processing module transmits control signal to the first Interference Control module, and the first Interference Control module suppresses path with the first special-purpose interference and inserts first radio frequency reception link; Noiseless as if being judged as, then the first Interference Control module inserts first radio frequency reception link with the first non-special-purpose inhibition path that disturbs.
11. the method that radio frequency cross is disturbed between first mode signal and second mode signal in the inhibition double-mode communication terminal as claimed in claim 10 is characterized in that described step (2) further comprises:
A) receive link work and first baseband processing module and monitor the second radio-frequency transmissions link enable signal when effective when two communication patterns of double-mode communication terminal are in holding state, first radio frequency together, be judged as and have of the interference of second mode signal in the terminal first mode signal;
B) be in holding state, first radio frequency and receive link work and first baseband processing module and monitor the second radio-frequency transmissions link enable signal when effective when first pattern of double-mode communication terminal is in communications status, second pattern, be judged as and have of the interference of second mode signal in the terminal first mode signal;
C) be in holding state, first radio frequency and receive link work and first baseband processing module and monitor the second radio-frequency transmissions link enable signal when effective when second pattern of double-mode communication terminal is in communications status, first pattern, be judged as and have of the interference of second mode signal in the terminal first mode signal.
12. the method that radio frequency cross is disturbed between first mode signal and second mode signal in the inhibition double-mode communication terminal as claimed in claim 10, it is characterized in that: described step (3) further comprises: maybe may have interference if be judged as existence, first baseband processing module transmits control signal to first receiver rf front-end, first receiver rf front-end is adjusted gain mode, optimizes the receptivity of first pattern.
13. the method that radio frequency cross is disturbed between first mode signal and second mode signal in the inhibition double-mode communication terminal as claimed in claim 10, further comprise: first baseband processing module is monitored the second radio-frequency transmissions link enable signal of the second radio-frequency transmissions circuit and is produced described control signal.
14. the method that radio frequency cross is disturbed between first mode signal and second mode signal in the inhibition double-mode communication terminal as claimed in claim 13, it is characterized in that: first baseband processing module directly produces control signal according to the second radio-frequency transmissions link enable signal.
15. the method that radio frequency cross is disturbed between first mode signal and second mode signal in the inhibition double-mode communication terminal as claimed in claim 13 is characterized in that: first baseband processing module receives hardwood error rate situation of change according to the second radio-frequency transmissions link enable signal in conjunction with first mode signal and produces described control signal.
16. the method that radio frequency cross is disturbed between first mode signal and second mode signal in the inhibition double-mode communication terminal as claimed in claim 13, it is characterized in that: when first pattern and second pattern receive link work and the second radio-frequency transmissions link enable signal when effective at net, first radio frequency simultaneously, first baseband processing module transmits control signal to the Interference Control module.
17. the method that radio frequency cross is disturbed between first mode signal and second mode signal in the inhibition double-mode communication terminal as claimed in claim 10, it is characterized in that: first pattern and second pattern are any two kinds in PHS, GSM, CDMA2000, WCDMA, TD-SCDMA, the WiFi mode standard.
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| CNA2005100286283A CN1731692A (en) | 2005-08-09 | 2005-08-09 | Dual-mode communication terminal capable of restraining two mode signal RF crosstalk interference and restraining method |
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| CNA2005100286283A CN1731692A (en) | 2005-08-09 | 2005-08-09 | Dual-mode communication terminal capable of restraining two mode signal RF crosstalk interference and restraining method |
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