CN100388634C - Wireless communication circuit, wireless communication apparatus, and wireless communication system - Google Patents

Wireless communication circuit, wireless communication apparatus, and wireless communication system Download PDF

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Publication number
CN100388634C
CN100388634C CNB2004100899682A CN200410089968A CN100388634C CN 100388634 C CN100388634 C CN 100388634C CN B2004100899682 A CNB2004100899682 A CN B2004100899682A CN 200410089968 A CN200410089968 A CN 200410089968A CN 100388634 C CN100388634 C CN 100388634C
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China
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signal
wireless communication
communication circuit
control device
amplifier
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CN1604491A (en
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大森学
仲林次郎
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Sharp Corp
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Sharp Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

A wireless communication circuit in accordance with the present invention, is the wireless communication circuit having an amplifier for amplifying a signal, includes an amplification route in which the signal passes through the amplifier; a bypass route for bypassing the amplifier; and a route-selector for selecting one of the amplification route and the bypass route. This arrangement prevents an amplification of a signal, being transmitted or being received, when a communication counterpart is in a close distance, thereby reducing an unnecessary power consumption.

Description

Wireless communication circuit, radio communication device, wireless communication system
Technical field
The wireless communication system that the present invention relates to wireless communication circuit, has its radio communication device and use it, wireless communication circuit is applicable to the card-type radio communication device, itself and personal computer and ADSL (Asymmetric Digital Subscriber Line; ADSL (Asymmetric Digital Subscriber Line)) civilian AV equipment such as information terminal devices such as modulator-demodulator, WAP (wireless access point) and wireless router, TV and DVD are connected, and have DS (the Direct Spread that utilizes spread spectrum (Spread Spectrum) technology; Direct-Spread) radio communication function of mode.
Background technology
At first, below explanation is about wireless spread spectrum.Usually, in the communication that utilizes spread spectrum, after the modulation signal of the input baseband signal of having been modulated sound etc. by transmitting terminal uses the spreading code spread spectrum, send to the communication counterpart end as high-frequency signal.And at receiving terminal, the spread-spectrum signal of being received by the communication counterpart termination uses the spreading code identical with transmitting terminal to come demodulation (despreading).
Thereby, in utilizing the communication mode of spread spectrum, Direct-Spread (Direct Spread) mode and frequency-hopping spread spectrum mode are arranged.The Direct-Spread mode multiply by narrowband modulation ripple and while spread spectrum with spreading code, or uses a certain continuous frequency band equably.On the other hand, the frequency of the carrier wave when the frequency-hopping spread spectrum mode communicates with communication counterpart by switching randomly by spreading code is carried out spread spectrum with signal in frequency band, bluetooth (Bluetooth, registered trade mark) etc. is for example arranged.
Below, existing card-type radio communication device is described.Figure 21 is the frame circuit diagram of the summary structure of the existing card-type radio communication device of expression.The existing card-type radio communication device 50 of Figure 21 is made of following circuit structure.Antenna 51 is connected respectively to receiving circuit portion 52 and transtation mission circuit portion 57.
Receiving circuit portion 52 is made of amplifier 53, mixting circuit 54 and demodulator circuit 55, and antenna 51 is connected to base band signal process circuit part 61 via amplifier 53, mixting circuit 54, demodulator circuit 55.
And transtation mission circuit portion 57 is made of modulation circuit 60, mixting circuit 59 and amplifier 58, and base band signal process circuit part 61 is connected to antenna 51 via modulation circuit 60, mixting circuit 59, amplifier 58.And, in mixting circuit 54 and mixting circuit 59, connect local oscillator 56.
Base band signal process circuit part 61 is connected to connector 65 via interface circuit portion 62, respectively in receiving circuit portion 52, transtation mission circuit portion 57 and base band signal process circuit part 61, and connecting circuit control part 63.In addition, power supply unit 64 is connected to above-mentioned each circuit of connector 65 and card-type radio communication device 50.
Below, the action of the existing card-type radio communication device 50 of Figure 21 is described.At receiving terminal, the spread-spectrum signal from communication counterpart (for example, the 2.4GHz band) that is received by antenna 51 is exaggerated device 53 amplifications, and is applied on the mixting circuit 54.Be demodulated into baseband signal as the described spread-spectrum signal that receives high-frequency signal by mixting circuit 54 and demodulator circuit 55, carry out necessary signal processing by base band signal process circuit part 61, via interface circuit portion 62 and output to the information terminal device of not shown personal computer etc. from connector.
At transmitting terminal, never the information terminal device of illustrated personal computer etc. is via the data input signal of connector 65,62 inputs of interface circuit portion, carry out necessary signal processing by base band signal process circuit part 61, (for example spread to spread-spectrum signal by modulation circuit 60 and mixting circuit 59,2.4GHz band), be exaggerated device 58 and amplify, send to the communication counterpart end from antenna 51.
63 pairs of actions separately that receive circuit part 52, transtation mission circuit portion 57 and base band signal process circuit part 61 of circuit control part are controlled, the power supply that the power supply unit 64 information terminal device input of illustrated personal computer etc. is never supplied with via connector 65, described each the circuit supply power+B to card-type radio communication device 50 inside.
Local oscillator 56 produces the required frequency signal of each mixting circuit 54,59 action respectively (for example, 2.4GHz).
About the control of the RF signal of radio section, in various communication equipments, the signal that frequency is different with level is frequency conversion and modulation respectively, so need stable modulation characteristic.
At this moment, as one of most important factor, be to be called as input dynamic range.It is the index that expression can be stablized the scope that receives the extremely powerful input signal of the quite faint input signal of also demodulation.
About this dynamic range, in possessing the radio communication device of transmitter/receiver circuit, mainly by the parameter decision that sends (high frequency) performance number and receiving sensitivity, distorted characteristic etc.
But as a method that enlarges communication zone, in the past, under the near situation of the distance between main frame and handset, the attenuator circuit of the input stage by using receiver, reduce the GAIN (gain) of low noise amplifier and IF amplifier etc. simultaneously, thereby realize not worsening distorted characteristic (patent documentation 1: with reference to (Japan) the real flat 4-116440 communique (open day: on October 19th, 1992)) of opening for strong input signal.
Figure 22 is the block diagram of this conventional example of expression.In Figure 22, attenuator circuit (RF ATT) 90 is set between the input terminal 71 and high-frequency amplifier 78 of high-frequency input signal, is made of spendable each PIN diode 91,92,93 under the high frequency band.
Under this routine situation, the switching signal of the terminal 77 by making each diode 91,92,93 conduction and cut-off that is set to π shape from the power according to high-frequency input signal switches to the situation and the straight-through situation of carrying out high frequency attenuation.
Have again, in Figure 22, be provided with the lead-out terminal 87 of high freguency bandpass filter (RFBPF) 79, blender (MIXER) 80, first voltage-controlled oscillator (VCD1) 81, first intermediate frequency amplifier (IFAMP) 82, if bandpas filter 83, second intermediate frequency amplifier 84, FM wave detector (FMDET) 85, second voltage-controlled oscillator 86 and output rectified signal.Because these all are known circuit, so omit its explanation.In addition, the attenuator circuit 90 of Figure 22 also is configured between RF amplifier 78 and RFBPF79 or the blender 80 sometimes.
But, in prior art shown in Figure 21, power supply unit 64 to card-type radio communication device 50, never the information terminal device of illustrated personal computer etc. is via connector 65 supply powers, so when the information terminal device of personal computer etc. utilizes source power supply to use, do not have problems.
; when the information terminal device with personal computer etc. portably uses; the information terminal device of personal computer etc. moves battery built-in in its body as power supply; simultaneously to the power supply unit 64 of card-type radio communication device 50, battery built-in from the body of the information terminal device of personal computer etc. is via connector 65 supply powers.
Therefore, the electric power that consumes along with card-type radio communication device 50 increases, and battery built-in in the body of the information terminal device of personal computer etc. consumes fast, has the problem of portability service time of the information terminal device that shortens personal computer etc.
Summary of the invention
The object of the present invention is to provide available low consumpting power to carry out the wireless communication circuit of we and its other party while excellent communications, or according to the level of the high-frequency signal that receives, make the power supply of each circuit part that constitutes the card-type radio communication device independently carry out on/off control respectively, thereby can carry out the wireless communication circuit of low consumpting powerization.
To achieve these goals, wireless communication circuit of the present invention has the amplifier of amplifying signal, it is characterized in that, be provided with select a ground select to make signal by described amplifier pass through amplification path by with make signal walk around one of them route of the bypass route of described amplifier.
According to said structure, can select as required by amplification path by with the bypass route.For example, near at communication counterpart, do not need can select the bypass route under the situation of signal strength signal intensity, and far away at communication counterpart very much, when needing signal strength signal intensity, can select by amplification path by.
That is, selecting to amplify by under the situation of route, owing to signal can pass through amplifier, so need to drive the consumed power of this amplifier section, and under the situation of the bypass route of selecting to walk around amplifier, owing to do not need to drive above-mentioned amplifier, so the consumed power of this part not.
Therefore, although can avoid closely and still will amplifying the situation of the signal of the signal that will send or reception, so can reduce useless power consumption with the distance of communication counterpart.
The invention provides a kind of wireless communication circuit, have the amplifier of amplifying signal, described wireless communication circuit is provided with: make amplification path that signal passes through described amplifier by; And select one of them the routing arrangement that the bypass route of signal bypass by described amplifier selected to make in a ground, wherein, described routing arrangement comprises control device, described control device is judged the quality of the communications status of described wireless communication circuit, according to its result of determination generate select described amplification path by with one of them first control signal of bypass route, under the consistent situation of the content that described control device was predicted from the communicator of communication counterpart before the reception situation of the reception data that the signal that receives according to described wireless communication circuit generates and reception at above-mentioned signal, it is good to be judged to be communications status.
The present invention also provides a kind of wireless communication circuit, has the amplifier of amplifying signal, and described wireless communication circuit is provided with: make amplification path that signal passes through described amplifier by; And select one of them the routing arrangement that the bypass route of signal bypass by described amplifier selected to make in a ground, wherein, described routing arrangement comprises the quality of the communications status of judging described wireless communication circuit, according to its result of determination generate select described amplification path by with one of them the control device of first control signal of bypass route, when even described control device is less than or equal to pre-set threshold in the intensity of the signal of described wireless communication circuit reception, still be judged to be under the good situation of communications status, generate first control signal of selecting the bypass route, under the consistent situation of the content that described control device was predicted from the communicator of communication counterpart before the reception situation of the reception data that the signal that receives according to described wireless communication circuit generates and reception at above-mentioned signal, it is good to be judged to be communications status.
The present invention also provides a kind of wireless communication circuit, has the amplifier of amplifying signal, and described wireless communication circuit is provided with: make amplification path that signal passes through described amplifier by; And select one of them the routing arrangement that the bypass route of signal bypass by described amplifier selected to make in a ground, wherein, described routing arrangement comprises the quality of the communications status of judging described wireless communication circuit, according to its result of determination generate select described amplification path by with one of them the control device of first control signal of bypass route, even the intensity of the signal that described control device receives at described wireless communication circuit is during more than or equal to pre-set threshold, still be judged to be under the situation of communications status difference, generate to select amplification path by first control signal, under the consistent situation of content that described control device was predicted from the communicator of communication counterpart before the reception situation of the reception data that the signal that receives according to described wireless communication circuit generates and reception at above-mentioned signal, it is good to be judged to be communications status.Other purposes of the present invention, feature and advantage are clearer and more definite by following record meeting.In addition, advantage of the present invention can be clearer in the following explanation of reference accompanying drawing.
Description of drawings
Fig. 1 is the block diagram of concrete example of the switching mode of the transmit power amplifier of card-type radio communication device of expression an embodiment of the present invention and bypass circuit.
Fig. 2 is the frame circuit diagram of the schematic configuration of the above-mentioned card-type radio communication device of expression.
Fig. 3 is the block diagram of concrete example of the switching mode of expression transmit power amplifier of another embodiment of the present invention and fixed attenuator.
Fig. 4 is the block diagram of concrete example of the switching mode of expression transmit power amplifier of another embodiment of the present invention and variable attenuator.
Fig. 5 is the block diagram of concrete example of the switching mode of the reception low noise amplifier of expression the present invention another execution mode and bypass circuit.
Fig. 6 is the block diagram of concrete example of the switching mode of the reception low noise amplifier of expression the present invention another execution mode and fixed attenuator.
Fig. 7 is the block diagram of concrete example of the switching mode of the reception low noise amplifier of expression the present invention another execution mode and variable attenuator.
Fig. 8 (a)～Fig. 8 (f) is the table that expression has or not the analog result of relation between transmit power amplifier and the arrival distance.
Fig. 9 (a)～Fig. 9 (f) is that expression has or not the table that receives low noise amplifier and arrive the analog result of relation between the distance.
Figure 10 is illustrated in the transmitting system, according to the RSSI value, to the switching of power amplifier and bypass route and the flow chart of the electric power of power amplifier being supplied with the process of controlling.
Figure 11 is illustrated in the transmitting system, according to the RSSI value, to the switching of power amplifier and fixed attenuator and the flow chart of the electric power of power amplifier being supplied with the process of controlling.
Figure 12 is illustrated in the transmitting system, according to the RSSI value, to the switching of the attenuation of the switching of power amplifier and variable attenuator, variable attenuator and the flow chart of the electric power of power amplifier being supplied with the process of controlling.
Figure 13 is illustrated in the receiving system, according to the RSSI value, to the switching of low noise amplifier and bypass route and the flow chart of the electric power of low noise amplifier being supplied with the process of controlling.
Figure 14 is illustrated in the receiving system, according to the RSSI value, to the switching of low noise amplifier and fixed attenuator and the flow chart of the electric power of low noise amplifier being supplied with the process of controlling.
Figure 15 is illustrated in the receiving system, according to the RSSI value, to the switching of the attenuation of the switching of low noise amplifier and variable attenuator, variable attenuator and the flow chart of the electric power of low noise amplifier being supplied with the process of controlling.
Figure 16 is the key diagram of the structure of expression server relevant with the communication protocol of WLAN and client.
Figure 17 is that expression is input to the key diagram that power supply to low noise amplifier and power amplifier carries out the various information in the control device of break-make.
Figure 18 (a) is that the transmission of the coded data of expression vision signal receives key diagram regularly, and Figure 18 (b) is that the transmission of the coded data of expression voice signal receives key diagram regularly.
Figure 19 is that expression will send the key diagram that concerns between state that signal decays with fixed attenuator or variable attenuator and the communication distance.
Figure 20 is the curve chart of expression based on the generation of first control signal of RSSI value or second control signal.
Figure 21 is the block diagram of the schematic configuration of general card-type radio communication device.
Figure 22 is the block diagram that adopts the wireless module of general RFAGC circuit.
Embodiment
Below, for the embodiments of the present invention, illustrate with reference to accompanying drawing.
Fig. 2 is the frame circuit diagram of schematic configuration of the card-type radio communication device of each execution mode of expression.Constitute by following circuit from the antenna end of above-mentioned card-type radio communication device to Base-Band Processing LSI.
In above-mentioned card-type radio communication device, be provided with and be used for the transmission signal is transmitted into the outside, and pick up antenna 1 from the received signal of outside.Antenna 1 comprises common antenna and diversity antenna, is connected respectively to receiving circuit portion (receiving system) and transtation mission circuit portion (transmitting system) via diversity switch (SW) 1a that switches them and RF band pass filter (BPF) 2.
In receiving circuit portion, the received signal that is input to antenna 1 is by the useless frequency component of RF band pass filter (BPF) 2 decay, then, when having selected receiving terminal by the switch (TX/RXSW) 3 that switches the transmission reception, this received signal is imported into low noise amplifier (LNA) 4 and is exaggerated.Then, received signal is further decayed by low pass filter 5 grades behind the unwanted signal, is transformed to intermediate frequency (IF) (down-conversion) by the reception that is provided with in the RF U/D converter with frequency mixer 6, and then implements frequency band limits by IF filter 7, carries out the IQ demodulation.Thus, for baseband processing circuitry 8, send each signal of I signal and Q signal respectively.Have, the RF frequency of above-mentioned received signal also can directly down-convert to base band frequency again, replaces to carry out down-conversion to the IF frequency.
In baseband processing circuitry 8, carried out the reproducing signal after the signal processing, for example if the PC card, then by PCMCIA (the card bus of 16BIT or 32BIT), if USB adapter, then by USB1.1 or USB2.0, when the SD card, by SDIO, in built-in, be output to personal computer, PDA or other information respectively and send receiving terminal by pci bus etc.
On the other hand, described transtation mission circuit portion will be from above-mentioned personal computer, PDA (Personal DigitalAssistants), or other information terminal device is via interface circuit (PCMCIA described later, USB, SDIO etc.) Shu Ru data input signal carries out signal processing with baseband processing circuitry 8, and then after carrying out the IQ modulation, after formation IF signal also carries out up-conversion (frequency conversion) with the transmission that is provided with in the RF U/D converter with frequency mixer 11, press and the complete rightabout signal flow of reception condition, send the transmission signal after the signal that will modulate amplifies with power amplifier 9 from antenna 1.
Such card-type radio communication device in common communication operation, alternately switches transmission and reception by switch (TX/RXSW) 3 by not shown controller control with the short time.
In addition, in above-mentioned IQ modulator-demodulator, to for example carry out envelope detection by the received signal that IF filter 7 has applied frequency band limits, become the received signal intensity index value (RSSI:Received Signal Strength Indicator) of direct voltage by diode.Above-mentioned RSSI is imported into baseband processing circuitry 8, is used to generate each control signal as described later.
Have again, in above-mentioned receiving circuit portion and transtation mission circuit portion, from power supply 40 supply capabilities.
(first execution mode)
Fig. 1 is the frame circuit diagram of high-frequency circuit portion of the radio communication device of expression first execution mode of the present invention, and the major part of this high-frequency circuit portion constitutes by sending to switch with switch 23,24 with amplifier (amplifier) 9, bypass route 22, the route that sends signal.
Therefore, wireless communication circuit of the present invention is to be used for the wireless communication circuit that information sends receiving terminal, comprising: antenna 1; Be connected to the power amplifier 9 as the transmission usefulness of amplifier of antenna 1; The bypass route 22 that the signal path of power amplifier 9 (amplification path by) is carried out bypass (making a circulation); Selecting the signal path of a ground switched power amplifier 9 and the route of bypass route 22 switches with switch (first switch) 23,24.
Detector diode 10 in the described transtation mission circuit portion is to be used for carrying out detection to sending output signal with Schottky diode, thereby its DC component is fed back to the TXDET circuit (constituting) that is arranged at baseband processing circuitry 8 usually by OP amplifier etc., as the result who automatically changes the AGC Amplifier Gain, the transmitted power of antenna 1 end reaches fixing circuit, is known circuit.
In the first embodiment, as shown in Figure 2, in baseband processing circuitry 8, be provided with the control device 18 of controlling the action of low noise amplifier 4, power amplifier 9 based on above-mentioned RSSI.In control device 18, control route according to the signal strength signal intensity of received signal, i.e. expression with the signal of the distance of communication counterpart and switch the switching of using switch 23,24.Therefore, control device 18 has generating unit 18a, and this generating unit generates and is used for controlling control (on/off) signal (first control signal) that route is switched the switching of using switch 23,24 according to the magnitude of voltage of RSSI.
Have again, control device 18 (comprising generating unit 18a) and route are switched with switch 23,24 and are constituted routing arrangements, select a ground select with the amplification path of above-mentioned low noise amplifier 4 of signal bypass or power amplifier 9 by and with one of them of the bypass route of signal bypass low noise amplifier 4 or power amplifier 9.
In addition, by obtain should be to received signal intensity and the data of communication distance, also the magnitude of voltage of RSSI can be transformed to communication distance.In this case, for example, also can with detect received signal intensity test section, should be to received signal the intensity and the storage part (check table etc.) of the above-mentioned data of communication distance and decide the determination section of the communication distance corresponding to be arranged in the control device 18 according to above-mentioned data with detected intensity.Thus, control device 18 can be constituted as the communication distance checkout gear and the above-mentioned routing arrangement of detection with the distance of communication counterpart.
And, in the first embodiment, also comprise and turn-off the second switch 41 of connection the electric power from power supply 40 of low noise amplifier 4, power amplifier 9 is supplied with.Control device 18 has with route and switches with switch 23,24 (below, abbreviate switch 23,24 as) interoperation, generates the control part 18b of second control signal that second switch 41 is controlled.About above-mentioned control device 18 and second switch 41, in other execution modes shown below, use too.
Have, control device 18 (comprising control part 18b) and second switch 41 constitute the power remove device again, with the selection interoperation of bypass route, turn-off the power supply of above-mentioned low noise amplifier 4 or power amplifier 9 is supplied with.
As shown in figure 20, RSSI generates as dc voltage.Therefore, the magnitude of voltage with respect to RSSI comes setting threshold (for example, 1.5V), by comparing magnitude of voltage and the threshold value of RISS, can generate above-mentioned first control signal or second control signal.For example, as shown in figure 20, when the magnitude of voltage of RSSI is lower than threshold value, because received signal intensity is weak state, so for power amplifier 9 or low noise amplifier 4 are connected, the level that makes second control signal is a high level.And at the magnitude of voltage of RSSI during more than or equal to threshold value, because received signal intensity is strong state, so for power amplifier 9 or low noise amplifier 4 are turn-offed, making communicator is battery saving mode, the level that makes second control signal is a low level.
Below, the course of action in the structure of argumentation present embodiment.At first, in this card-type radio communication device, because of with the distance of main frame (equipment of access point or router etc., send box etc.), the received signal level that wave mode is input to above-mentioned receiving circuit portion changes, for wireless mode the time, be self-evident, but use the desired value (RSSI) of this received signal level, represent the power of the electric wave imported.For example, if portable phone as the These parameters value, represents that electric wave is the strongest when being labeled as three lines, when 1 or 0, represent electric wave a little less than.
As such desired value, monitor the direct voltage that is arranged on the terminal that is called as above-mentioned RSSI in the baseband processing circuitry 8 shown in Figure 2, and definite threshold value, for example can enumerate above-mentioned such three grades of formulas numeral and show.
Under the situation of the present invention, use the magnitude of voltage (below, be called the RSSI value) of this RSSI, for example carry out the switching of two-stage.Following flow chart according to Figure 10 illustrates the action of the control device 18 of this moment.
At first, control device 18 monitor the RSSI terminal of baseband processing circuitries 8 direct voltage, be RSSI value, detect RSSI value after, whether the RSSI value of judging detection more than or equal to the level of stipulating (step (following brief note is S) 1).
The RSSI value more than or equal to the regulation level the time, control device 18 is identified as apart from main frame nearly (S2), come control switch 23,24 by baseband processing circuitry (control system controller) 8 by the on/off (ON/OFF) of control (on/off) signal (PA_CTRL), to select bypass route 22.That is, control device 18 makes generating unit 18a generate first control signal that switch 23,24 is controlled, and switches to bypass route 22 (S3) with the signal path with power amplifier 9.
At this moment, power amplifier 9 becomes the condition of supplying of cutting off the electricity supply by the shutoff of the second switch 41 of the action of cooperation switch 23,24.For this reason, control device 18 makes control part 18b generate second control signal (S4) that second switch 41 is turn-offed (OFF).
On the other hand, in S1, if the RSSI value that detects is lower than the level of regulation, then control device 18 is identified as apart from main frame (S5) far away, come control switch 23,24 from baseband processing circuitry 8 by the on/off of control (on/off) signal (PA_CTRL), to carry out sending output after signal amplifies at power amplifier 9.That is, make generating unit 18a generate first control signal that switch 23,24 is controlled, bypass route 22 is switched to the signal path (S6) of power amplifier 9.
At this moment, power amplifier 9 is supplied to power supply and can amplifies action by the connection (ON) of the second switch 41 of the action of cooperation switch 23,24.For this reason, control device 18 makes control part 18b generate second control signal (S7) that second switch 41 is connected.
Have, the user of communicator also can be by the manual type on/off of the interlock of diverter switch 23,24 and second switch 41 forcibly again.Thus, for example, tail off at the battery allowance because of communicator, the user will suppress can select bypass route 22 with manual type in the situation of communication of power consumption.
Like this, first execution mode is in when communication, with the short situation of the communication distance of communication counterpart (main frame etc.) under because can be with the power remove of power amplifier 9, so power saving significantly has the effect of the duration of battery " improve " and " energy-saving design ".
(second execution mode)
Fig. 3 is the frame circuit diagram of high-frequency circuit portion of the radio communication device of expression the present invention another execution mode.The major part of this high-frequency circuit portion is made of with the switch 23,24 that amplifier 9, the fixed attenuator 22a that replaces above-mentioned bypass route 22 shown in Figure 1 and switching send the route of signal transmission.The effect of detector diode 10 as described above.
Below, the course of action in this structure is described.This card-type radio communication device according to the distance of main frame (equipment of access point or router etc., send box etc.), use the RSSI value to carry out the switching of two-stage.Following flow chart according to Figure 11 illustrates the action of the control device 18 of this moment.
At first, control device 18 monitor the RSSI terminal of baseband processing circuitries 8 direct voltage, be RSSI value, detect RSSI value after, whether the RSSI value of judging detection more than or equal to the level of stipulating (S11).
During more than or equal to the value of regulation, control device 18 is identified as apart from main frame nearly (S12), comes control switch 23,24 by baseband processing circuitry 8 by the on/off (ON/OFF) of PA_CTRL, to select fixed attenuator 22a in the RSSI value.That is, control device 18 makes generating unit 18a generate first control signal that switch 23,24 is controlled, and switches to the signal path (S13) of fixed attenuator 22a with the signal path with power amplifier 9.
At this moment, the shutoff of the second switch 41 that cooperates by the action with switch 23,24 of power amplifier 9 becomes power supply and supplies with the state that is opened circuit.For this reason, control device 18 makes control part 18b generate second control signal (S14) that second switch 41 is turn-offed.
On the other hand, in S11, if the RSSI value that detects is lower than the level of regulation, then control device 18 is identified as apart from main frame (S15) far away, come control switch 23,24 by baseband processing circuitry 8 by the on/off of PA_CTRL, to be undertaken sending output after signal amplifies by power amplifier 9.That is, make generating unit 18a generate first control signal that switch 23,24 is controlled, switch to the signal path (S16) of power amplifier 9 with signal path fixed attenuator 22a.
At this moment, the connection of the second switch 41 that cooperates by the action with switch 23,24 of power amplifier 9 becomes power supply and supplies with the state that is switched on.For this reason, control device 18 makes control part 18b generate second control signal (S17) that second switch 41 is connected.
Have, the user of communicator also can be by the manual type on/off of the interlock of diverter switch 23,24 and second switch 41 forcibly again.Thus, for example, communicator battery allowance tail off, the user will suppress can select the signal path of fixed attenuator 22a with manual type in the situation of communication of power consumption.
Second execution mode is a radio communication device, it is characterized in that, in the one of high-frequency amplifier stages of circuitry block, be provided with to send and control their each switch 23,24 with power amplifier 9 and fixed attenuator 22a and by transferring, according to the distance of communication counterpart, for example main frame (equipment such as access point or router, send box etc.), switch above-mentioned switch 23,24 according to level, above-mentioned power amplifier 9 and fixed attenuator 22a selectivity are enclosed in the circuit the high-frequency input signal that receives piece.
Therefore, except " improving the duration of battery " and " energy-saving design " of the invention effect of above-mentioned first execution mode by the former state employing, very near with the distance of main frame, fixed attenuator 22a automatically is chosen as under the situation of the route that signal passes through, compare with using bypass route 22 in first execution mode, can further reduce this communication equipment (radio communication device of the present invention and as the device of its main frame) device is in addition used identical frequency band and the interference level that produces.
Particularly under the situation of the WLAN that adopts the IEEE802.11b specification standards etc., the frequency of using is 2.4GHz, at present, owing to can quite freely use as the relation of industry, science, medical treatment, so various devices such as bluetooth, microwave oven, POS terminal and surveillance camera produce electric wave, as rule, using fixed attenuator 22a to suppress the electric wave launching electrical level is important function.
And, when the RSSI value was bigger than the level of stipulating, promptly communication distance selected fixed attenuator 22a to reduce to send the current value of signal in the scope nearer than setting, so compare with the structure of the Fig. 1 that does not use fixed attenuator 22a, can further save battery consumption.
In addition, as the 3rd following execution mode, use variable attenuator 22b to replace fixed attenuator 22a, compare with the situation that is classified to reduce to send the current value of signal according to communication distance, in following condition, favourable because of saving battery.As shown in figure 19, this condition is that the current value that sends signal in a certain communication distance is reduced to setting I 0Situation under, ((distance D 2～D3) is wide than its opposite communication range for distance D 1～D2) for the communication range of the current value I (variable) the when current value I (fix) when using fixed attenuator 22a is lower than use variable attenuator 22b.
(the 3rd execution mode)
Fig. 4 is the frame circuit diagram of high-frequency circuit portion of the radio communication device of expression the present invention another execution mode.The major part of this high-frequency circuit portion is made of with the switch 23,24 that amplifier 9, the variable attenuator 22b that replaces above-mentioned bypass route 22 shown in Figure 1 and switching send the route of signal transmission.The effect of detector diode 10 as described above.
Below, the course of action in this structure is described.This card-type radio communication device according to the distance of main frame (equipment of access point or router etc., send box etc.), use the RSSI value to carry out careful switching.Following flow chart according to Figure 12 illustrates the action of the control device 18 of this moment.
At first, control device 18 monitor the RSSI terminal of baseband processing circuitries 8 direct voltage, be RSSI value, detect RSSI value after, whether the RSSI value of judging detection more than or equal to the level of stipulating (S21).
During more than or equal to specified level 1, control device 18 is identified as apart from main frame nearly (S22), comes control switch 23,24 by baseband processing circuitry 8 by the on/off of PA_CTRL in the RSSI value, to select variable attenuator 22b.That is, control device 18 makes generating unit 18a generate first control signal that switch 23,24 is controlled, and switches to the signal path (S23) of variable attenuator 22b with the signal path with power amplifier 9.
At this moment, the shutoff of the second switch 41 that cooperates by the action with switch 23,24 of power amplifier 9 becomes power supply and supplies with the state that is opened circuit.For this reason, control device 18 makes control part 18b generate second control signal (S24) that second switch 41 is turn-offed.
Then, the size of the electric wave level that changes according to the distance along with the distance main frame is for example by the resolution of 4 D/A converter, (for example tackle by the baseband processing circuitry 8 that can set attenuation meticulously, if be the attenuation of 40dB, then under 4 situation, every grade is 2.5dB).
For example, control device 18 judges that the RSSI value that detects is whether more than or equal to the specified level 2 (S25) bigger than specified level 1.In the RSSI value that detects during more than or equal to specified level 2, whether the RSSI value that control assembly 18 is further judged detections is more than or equal to the specified level 3 (S26) bigger than specified level 2.Here, be under the situation of the upper limit of multistage preset threshold in specified level 3, if the RSSI value that detects is more than or equal to specified level 3, then control device 18 is via the D/A converter, and the attenuation of variable attenuator 22b is set at the level of attenuation 3 (maximum attenuation amount) corresponding with specified level 3 (S27).
On the other hand, in S25,, then the attenuation of variable attenuator 22b is set at the level of attenuation 1 (minimal attenuation amount) corresponding (S28) with specified level 1 if the RSSI value that detects is lower than specified level 2.And in S26,, then the attenuation of variable attenuator 22b is set at the level of attenuation 2 (S29) corresponding with specified level 2 if the RSSI value that detects is lower than specified level 3.
Have again, with the RSSI value relatively specified level 1～3 and be stored in the memory of control device 18 accessible check tables etc. with the corresponding level of attenuation 1～3 of specified level 1～3.
On the other hand, in S21, if the RSSI value that detects is lower than specified level 1, then control device 18 is identified as apart from main frame (S30) far away, come control switch 23,24 by baseband processing circuitry 8 by the on/off of PA_CTRL, amplify back transmission output so that it is carried out signal by power amplifier 9.That is, make generating unit 18a generate first control signal that switch 23,24 is controlled, switch to the signal path (S31) of power amplifier 9 with signal path variable attenuator 22b.
At this moment, the connection of the second switch 41 that cooperates by the action with switch 23,24 of power amplifier 9 becomes power supply and supplies with the state that is switched on.For this reason, control device 18 makes control part 18b generate second control signal (S32) that second switch 41 is connected.
Have, the user of communicator also can be by the manual type on/off of the interlock of diverter switch 23,24 and second switch 41 forcibly again.Thus, for example, communicator battery allowance tail off, the user will suppress can select the signal path of variable attenuator 22b with manual type in the situation of communication of power consumption.
The 3rd execution mode is a radio communication device, it is characterized in that, in the one of high-frequency amplifier stages of circuitry block, be provided with and send with power amplifier 9 and variable attenuator 22b and the switch 23,24 of controlling them, according to the distance of main frame (equipment such as access point or router, send box etc.), switch above-mentioned switch 23,24 according to level, above-mentioned power amplifier 9 and variable attenuator 22b selectivity are enclosed in the circuit the high-frequency input signal (RSSI) that receives piece.
Therefore, except " improving the duration of battery " and " energy-saving design " of the invention effect of above-mentioned first execution mode by the former state employing, very near with the distance of main frame, variable attenuator 22b automatically is chosen as under the situation of the route that signal passes through, compare with using bypass route 22 in first execution mode, can further reduce this communication equipment (radio communication device of the present invention and as the device of its main frame) device is in addition used identical frequency band and the interference level that produces.
And, in second execution mode of invention, owing to have fixed attenuator 22a, so big attenuation can not be set because of the danger of deterioration that communication distance is arranged, but in variable attenuator 22b, the maximum attenuation amount that can be all the time changes in can communicating according to the level of high-frequency input signal (RSSI) (is guaranteed communication distance, to be suppressed to minimal attenuation to the interference that external equipment produces simultaneously), so compare with second execution mode of invention, can suppress to disturb the electric wave launching electrical level of external equipment biglyyer.
That is, if the intensity that sends signal more than needs, then particularly produces the danger of disturbing to the close electronic equipment of the frequency band of the higher harmonic wave component of the electronic equipment that uses side frequency and disturbing wave and frequency acceptance band etc. and increases.Therefore, level according to RSSI, select the communications status of this moment or the attenuation rate of suitable communication distance via variable attenuator 22b, communications status or communication distance are worsened, will become and disturb the electric wave launching electrical level of external equipment to be suppressed to only level at any time.Its result, the danger that the transmission signal is disturbed generations such as electronic equipments is Min..
(the 4th execution mode)
Fig. 5 is the frame circuit diagram of high-frequency circuit portion of the radio communication device of expression another embodiment of the present invention, and the route that the major part of this high-frequency circuit portion is used by the low noise amplifier 4 (LNA), bypass route 32 and the received signal that receive usefulness is switched with switch 33,34 (first switch) and constituted.
Therefore, wireless communication circuit of the present invention is to be used for the wireless communication circuit that information sends receiving terminal, comprising: antenna 1; Low noise amplifier 4 as the amplifier that is connected to antenna 1; The signal path of low noise amplifier 4 is carried out the bypass route 32 of bypass (making a circulation); Select a ground and switch the signal path of low noise amplifier 4 and the route switching switch (first switch) 33,34 of bypass route 32.Have, at low noise amplifier 4 with electric power is supplied with between the power supply 40 of low noise amplifier 4, second switch 42 is set, the on/off of second switch 42 is controlled by second control signal that control part 18b generates.
Route switching switch 33,34 (below, abbreviate switch 33,34 as) same with the switch 23,24 of first execution mode, by controlling from control (on/off) signal of control device 18.In addition, also be associated, cooperate route to switch the action of using switch 33,34, transfer by the second switch 42 of action and supply with from the electric power of power supply 40 with low noise amplifier 4.
Below, the course of action in this structure is described.This card-type radio communication device according to the distance of main frame (equipment of access point or router etc., send box etc.), use RSSI voltage to carry out the switching of two-stage.Following flow chart according to Figure 13 illustrates the action of the control device 18 of this moment.
At first, as initial setting, switch 33,34 is selected low noise amplifier 4.This is because according to communications status, and the normal mode that electric power is supplied with switches to battery saving mode (selecting bypass route 32), and the situation opposite with it compared, and do not disturb in initial the reception.
Then, control device 18 monitor the RSSI terminal of baseband processing circuitries 8 direct voltage, be RSSI value, after detecting RSSI value, whether the RSSI value of judging detection more than or equal to the level of stipulating (S41).
In the moment that links of having established with main frame, under the situation of described RSSI value more than or equal to the level of regulation, control device 18 is identified as apart from main frame nearly (S42), comes control switch 33,34 by baseband processing circuitry 8 by the on/off of LNA_CTRL, to select bypass route 32.That is, control device 18 makes generating unit 18a generate first control signal that switch 33,34 is controlled, and switches to bypass route 32 (S43) with the signal path with low noise amplifier 4.
At this moment, the shutoff of the second switch 42 that cooperates because of the action with switch 33,34 of low noise amplifier 4 becomes the state that the supply of power supply is opened circuit.For this reason, control device 18 makes control part 18b generate second control signal (S44) that second switch 42 is turn-offed.
On the other hand, in S41, if the RSSI value that detects is lower than the level of regulation, then control device 18 is identified as apart from main frame (S45) far away, come control switch 33,34 by baseband processing circuitry 8 by the on/off of LNA_CTRL, being undertaken by low noise amplifier 4 after signal amplifies, to LPF5 input passing through signal as the receiving circuit of subordinate.That is, make generating unit 18a generate first control signal that switch 33,34 is controlled, switch to the signal path (S46) of low noise amplifier 4 with signal path bypass route 32.
At this moment, low noise amplifier 4 is supplied to power supply because of the connection of the second switch 42 that the action with switch 33,34 cooperates, thereby can amplify action.For this reason, control device 18 makes control part 18b generate second control signal (S47) that second switch 42 is connected.
Have, the user of communicator also can be by the manual type on/off of the interlock of diverter switch 33,34 and second switch 41 forcibly again.Thus, for example, tail off at the battery allowance because of communicator, the user will suppress can select bypass route 32 with manual type in the situation of communication of power consumption.
The 4th execution mode is a radio communication device, it is characterized in that, in the one of high-frequency amplifier stages of receiving circuit piece, be provided with and receive with low noise amplifier 4 and bypass route 32 and the switch 33,34 of controlling them, according to the distance of main frame (equipment such as access point or router, send box etc.), switch above-mentioned switch 33,34 according to level, above-mentioned low noise amplifier 4 and bypass route 32 selectivity are enclosed in the circuit the high-frequency input signal that receives piece.
Therefore, under the situation of having selected bypass route 32, the consumption electric power of common low noise amplifier 4 parts can intactly all be cut down.For example, in the WLAN card of present IEEE802.11b specification standards, the consumption electric power of low noise amplifier 4 account for whole card consumption electric power about 20/
Therefore, if be in and the distance of the main frame environment nearer than threshold value, consume then that electric power is compared with the past to be cut down, so can improve (notebook-sized personal computer, PDA, portable phones etc.) such as the battery-driven portable terminals of having used wireless device of the present invention (handset) but communication duration, and be energy-saving design.Have, the setting of relevant above-mentioned threshold value is discussed in the back again.
(the 5th execution mode)
Fig. 6 is the frame circuit diagram of high-frequency circuit portion of the radio communication device of expression another embodiment of the present invention.The major part of this high-frequency circuit portion is made of the switch 33,34 of the route of the low noise amplifier 4 that receives usefulness, the fixed attenuator 32a that replaces above-mentioned bypass route 32 shown in Figure 5, switching received signal.Have, at low noise amplifier 4 with electric power is supplied with between the power supply 40 of low noise amplifier 4, second switch 42 is set, the on/off of second switch 42 is controlled by second control signal that control part 18b generates.
Below, the course of action in this structure is described.This card-type radio communication device according to the distance of main frame (equipment of access point or router etc., send box etc.), use RSSI voltage to carry out the switching of two-stage.Following flow chart according to Figure 14 illustrates the action of the control device 18 of this moment.
At first, as initial setting, switch 33,34 is selected low noise amplifier 4.Then, control device 18 monitor the RSSI terminal of baseband processing circuitries 8 direct voltage, be RSSI value, after detecting RSSI value, whether the RSSI value of judging detection more than or equal to the level of stipulating (S51).
In the moment that links of having established with main frame, under the situation of described RSSI value more than or equal to the level of regulation, control device 18 is identified as apart from main frame nearly (S52), comes control switch 33,34 by baseband processing circuitry 8 by the on/off of LNA_CTRL, to select fixed attenuator 32a.That is, control device 18 makes generating unit 18a generate first control signal that switch 33,34 is controlled, and switches to the signal path (S53) of fixed attenuator 32a with the signal path with low noise amplifier 4.
At this moment, the shutoff of the second switch 42 that cooperates because of the action with switch 33,34 of low noise amplifier 4 becomes the state that the supply of power supply is opened circuit.For this reason, control device 18 makes control part 18b generate second control signal (S54) that second switch 42 is turn-offed.
On the other hand, in S51, if the RSSI value that detects is lower than the level of regulation, then control device 18 is identified as apart from main frame (S55) far away, come control switch 33,34 by baseband processing circuitry 8 by the on/off of LNA_CTRL, with carry out the signal amplification by low noise amplifier 4 after, to the LPF5 of subordinate input passing through signal.That is, make generating unit 18a generate first control signal that switch 33,34 is controlled, switch to the signal path (S56) of low noise amplifier 4 with signal path fixed attenuator 32a.
At this moment, low noise amplifier 4 is supplied to power supply because of the connection of the second switch 42 that the action with switch 33,34 cooperates, thereby can amplify action.For this reason, control device 18 makes control part 18b generate second control signal (S57) that second switch 42 is connected.
Have, the user of communicator also can be by the manual type on/off of the interlock of diverter switch 33,34 and second switch 42 forcibly again.Thus, for example, tail off at the battery allowance because of communicator, the user will suppress can select the signal path of fixed attenuator 32a with manual type in the situation of communication of power consumption.
The 5th execution mode is a radio communication device, it is characterized in that, each switch 33,34 that low noise amplifier 4 and fixed attenuator 32a is set in the one of high-frequency amplifier stages of receiving circuit piece and controls them, according to the distance of main frame (equipment such as access point or router, send box etc.), switch above-mentioned switch 33,34 according to level, above-mentioned low noise amplifier 4 and fixed attenuator 32a selectivity are enclosed in the circuit the high-frequency input signal that receives piece.
Therefore, except " improving the duration of battery " and " energy-saving design " of the invention effect of above-mentioned the 4th execution mode by the former state employing, distance at communicator and main frame is very near, thereby fixed attenuator 22a automatically is chosen as under the situation of the route that signal passes through, because it is near with the distance of main frame, so when receiving sensitivity worsens because of distorted characteristic, attenuation by fixed attenuator 32a is improved distorted characteristic, consequently, can be extended to the closely arrival distance (scope) of side.
Have again, if the hypotelorism of communicator and main frame, the reason that the receiving sensitivity of communicator worsens is, the distortion rate of switch shown in Figure 2 (TX/RXSW) 3, low noise amplifier 4, U/D converter etc. is a reason with the transistor that is used for them and the characteristic of diode, produces when the intensity of input signal is excessive and worsens.
(the 6th execution mode)
Fig. 7 is the frame circuit diagram of high-frequency circuit portion of the radio communication device of expression another embodiment of the present invention.The major part of this high-frequency circuit portion is made of the switch 33,34 of the route of low noise amplifier 4, the variable attenuator 32b that replaces above-mentioned bypass route 32 shown in Figure 5, switching received signal.Have, at low noise amplifier 4 with electric power is supplied with between the power supply 40 of low noise amplifier 4, second switch 42 is set, the on/off of second switch 42 is controlled by second control signal that control part 18b generates.
Below, the course of action in this structure is described.This card-type radio communication device according to the distance of main frame (equipment of access point or router etc., send box etc.), use RSSI voltage to carry out careful switching.Following flow chart according to Figure 15 illustrates the action of the control device 18 of this moment.
At first, control device 18 monitor the RSSI terminal of baseband processing circuitries 8 direct voltage, be RSSI value, after detecting RSSI value, whether the RSSI value of judging detection more than or equal to the level of stipulating 1 (S61).
Under the situation of described RSSI value more than or equal to the level 1 of regulation, control device 18 is identified as apart from main frame nearly (S62), comes control switch 33,34 by baseband processing circuitry 8 by the on/off of LNA_CTRL, to select variable attenuator 32b.That is, control device 18 makes generating unit 18a generate first control signal that switch 33,34 is controlled, and switches to the signal path (S63) of variable attenuator 32b with the signal path with low noise amplifier 4.
At this moment, the shutoff of the second switch 42 that cooperates because of the action with switch 33,34 of low noise amplifier 4 becomes the state that the supply of power supply is opened circuit.For this reason, control device 18 makes control part 18b generate second control signal (S64) that second switch 42 is turn-offed.
Then, the size of the electric wave level that changes according to the distance along with the distance main frame is for example by the resolution of 4 D/A converter, (for example tackle by the baseband processing circuitry 8 that can set attenuation meticulously, if be the attenuation of 40dB, then under 4 situation, every grade is 2.5dB).
For example, control device 18 judges that the RSSI value that detects is whether more than or equal to the specified level 2 (S65) bigger than specified level 1.In the RSSI value that detects during more than or equal to specified level 2, whether the RSSI value that control assembly 18 is further judged detections is more than or equal to the specified level 3 (S66) bigger than specified level 2.Here, be under the situation of the upper limit of multistage preset threshold in specified level 3, if the RSSI value that detects is more than or equal to specified level 3, then control device 18 is via the D/A converter, and the attenuation of variable attenuator 32b is set at the level of attenuation 3 (maximum attenuation amount) corresponding with specified level 3 (S67).
On the other hand, in S65,, then the attenuation of variable attenuator 32b is set at the level of attenuation 1 (minimal attenuation amount) corresponding (S68) with specified level 1 if the RSSI value that detects is lower than specified level 2.And in S66,, then the attenuation of variable attenuator 32b is set at the level of attenuation 2 (S69) corresponding with specified level 2 if the RSSI value that detects is lower than specified level 3.
Have again, with the RSSI value relatively specified level 1～3 and be stored in the memory of control device 18 accessible check tables etc. with the corresponding level of attenuation 1～3 of specified level 1～3.
On the other hand, in S61, if the RSSI value that detects is lower than specified level 1, then control device 18 is identified as apart from main frame (S70) far away, come control switch 33,34 by baseband processing circuitry 8 by the on/off of LNA_CTRL, so that it is undertaken after signal amplifies by low noise amplifier 4, to LPF5 input passing through signal as the receiving circuit of subordinate.That is, make generating unit 18a generate first control signal that switch 33,34 is controlled, switch to the signal path (S71) of low noise amplifier 4 with signal path variable attenuator 32b.
At this moment, the connection of the second switch that cooperates by the action with switch 33,34 of low noise amplifier 4 becomes the state of supply power.For this reason, control device 18 makes control part 18b generate second control signal (S72) that second switch 42 is connected.
Have, the user of communicator also can be by the manual type on/off of the interlock of diverter switch 33,34 and second switch 42 forcibly again.Thus, for example, communicator battery allowance tail off, the user will suppress can select the signal path of variable attenuator 32b with manual type in the situation of communication of power consumption.
The 6th execution mode is a radio communication device, it is characterized in that, the switch 33,34 that low noise amplifier 4 and variable attenuator 32b is set in the one of high-frequency amplifier stages of circuitry block and controls them, according to the distance of main frame (equipment such as access point or router, send box etc.), switch above-mentioned switch 33,34 according to level, above-mentioned low noise amplifier 4 and variable attenuator 32b selectivity are enclosed in the circuit the high-frequency input signal (RSSI) that receives piece.
Therefore, except " improving the duration of battery " and " energy-saving design " of the invention effect of above-mentioned the 4th execution mode by the former state employing, very near with the distance of main frame, variable attenuator 32b automatically is chosen as under the situation of the route that signal passes through, because it is near with the distance of main frame, so when receiving sensitivity worsens because of distorted characteristic, by according to the level of high-frequency input signal (RSSI) and change the attenuation of variable attenuator 32b changeably, compare with the 5th execution mode of invention, can more exchange and be extended to the closely arrival distance (scope) of side easily.
For example, by using variable attenuator 32b, be not to select that two kinds of patterns of decay (1)/undamped (0) are arranged, and can carry out finer model selection (attenuation is big/in/little/do not have/switch to a low noise amplifier).Therefore, when in high-frequency input signal (RSSI), producing rapid level and changing, compare, receiving sensitivity is reached and at that time the corresponding optimum sensitivity of communication distance with the situation of two kinds of model selections.
As an example, in the communication distance of the attenuation that needs 30dB originally, because producing rapid level in high-frequency input signal (RSSI) changes, even so in the optimum value of attenuation when 30dB is changed to 20dB, if 30dB or 0 two kinds of model selections, then having to make attenuation is 0.Therefore, the result of the hypotelorism of communicator and main frame, receiving sensitivity worsens because of distorted characteristic, and the generation frequency that receives mistake rises.
On the contrary, by using variable attenuator 32b, owing to can carry out the setting of the optimized attenuation amount corresponding, so can suppress the rising of generation frequency of deterioration, the reception mistake of receiving sensitivity with at that time communications status or communication distance.
In addition, by using variable attenuator 32b, but for example hold under the situation that PDA or portable phone etc. communicate, change with real-time mode with the distance of main frame, so more effective in walking.
Radio communication device of the present invention comprises: antenna; The receiving circuit portion that will carry out frequency conversion and demodulation and export baseband receiving signals from the high-frequency signal that this antenna receives; The baseband transmit signals of input is modulated with frequency conversion and to the transtation mission circuit portion of described antenna output high-frequency signal; Carry out the baseband processing circuitry portion of the signal processing of described baseband transmit signals and baseband receiving signals; Interface circuit portion with the interface function between described information terminal device; Power supply unit to described each circuit part's supply power; And the connector that is connected to described information terminal device; It is characterized in that, embed with in the module at card-type radio communication device that is connected to information terminal device or equipment, in the one of high-frequency amplifier stages of circuitry block, constitute by the switching circuit that transmit power amplifier and bypass circuit is set and controls them, according to the distance of main frame (equipment such as access point or router, send box etc.), switch said switching circuit according to level, above-mentioned power amplifier and bypass circuit selectivity are enclosed in the circuit the high-frequency input signal that receives piece.
In above-mentioned radio communication device, also can be in the one of high-frequency amplifier stages of circuitry block, by transmit power amplifier and fixed attenuation circuit being set and the switching circuit that they are controlled being constituted, according to the distance of main frame (equipment such as access point or router, send box etc.), switch said switching circuit according to level, above-mentioned power amplifier and fixed attenuation circuit selectivity are enclosed in the circuit the high-frequency input signal that receives piece.
In above-mentioned radio communication device, also can be in the one of high-frequency amplifier stages of circuitry block, by transmit power amplifier and variable attenuation circuit being set and the switching circuit that they are controlled being constituted, according to the distance of main frame (equipment such as access point or router, send box etc.), switch said switching circuit according to level, above-mentioned power amplifier and variable attenuation circuit selectivity are enclosed in the circuit the high-frequency input signal that receives piece.
In above-mentioned radio communication device, also can be in the one of high-frequency amplifier stages of receiving circuit piece, by low noise amplifier and bypass circuit being set and the switching circuit that they are controlled being constituted, according to the distance of main frame (equipment such as access point or router, send box etc.), switch said switching circuit according to level, above-mentioned low noise amplifier and bypass circuit selectivity are enclosed in the circuit the high-frequency input signal that receives piece.
In above-mentioned radio communication device, also can be in the one of high-frequency amplifier stages of receiving circuit piece, by low noise amplifier and fixed attenuation circuit being set and the switching circuit that they are controlled being constituted, according to the distance of main frame (equipment such as access point or router, send box etc.), switch said switching circuit according to level, above-mentioned low noise amplifier and fixed attenuation circuit selectivity are enclosed in the circuit the high-frequency input signal that receives piece.
In above-mentioned radio communication device, also can be in the one of high-frequency amplifier stages of receiving circuit piece, by low noise amplifier and variable attenuation circuit being set and the switching circuit that they are controlled being constituted, according to the distance of main frame (equipment such as access point or router, send box etc.), switch said switching circuit according to level, above-mentioned low noise amplifier and variable attenuation circuit selectivity are enclosed in the circuit the high-frequency input signal that receives piece.
Below, with the situation of first execution mode as an example, use Fig. 8 of expression analogue data to illustrate which type of degree the threshold setting of communication distance that will be relevant with RSSI value arrives.The simulated conditions relevant with the distance of communicating by letter (arriving distance) of main frame and handset are as follows.
Under the simplest situation of electric wave path, the result of calculation that only will suppose directly to transmit electric wave (ground wave) between the transmitting antenna of visual range (appreciable distance) and reception antenna is as follows.
Under the situation of the isotropic antenna that uses hypothesis, in transmitted power (Pt), if consider that how many transmitted powers are used as received power (Pr) and catch, then the wavelength (λ) of antenna distance (d) and frequency of utilization has relation, and the relation between Pt and the Pr is represented by following formula.
Pr=Pt * (λ/4 π d) 2=Pt/ (4 π d/ λ) 2... formula 1
Pr=Pt * (λ/4 π d) 2.5=Pt/ (4 π d/ λ) 2.5... formula 2
Pr=Pt * (λ/4 π d) 3=Pt/ (4 π d/ λ) 3... formula 3
Wherein, (λ/4 π d) 2 or 2.5 or 3=Pt/Pr=Lp is called as free space and transmits loss.
2 power laws of formula 1 are represented desirable free space.2.5 power laws of formula 2 are the empirical law in the space (environment) according to average family and the general index that uses.3 power laws of formula 3 represent to suppose the index under the situation of the frequent working spaces (environment) that produce such as desk or cabinet or people move.
Have, in the design of the communicator of reality, communication environment near 2 power laws, 2.5 power laws, 3 power laws which, is specified one of them formula of formula 1～3 according to again.
Then, be respectively Gt, Gr if establish the directive gain separately (absolute gain (dBi)) of send/receive antenna, then available following formula is represented.
Pr＝Pt·Gt·(1/Lp)·Gr
Therefore, if represent it, then following such with the decibel mode.
Pr(dBm)＝Pt(dBm)+Gt(dB)-10logLp+Gr(dB)
As showing to calculate according to the formula that it is carried out relevant distortion gained apart from d, the table of the Fig. 8 that programmes out.
From this Simulation result as can be known, in the general 2.5 power laws that use, shown in Fig. 8 (e), if in the scope about 26 meters, then during the use in average family, expectation can communicate and no problem.Therefore, under the situation of coming according to 2.5 power laws, be the value corresponding with 26 meters communication distance with the threshold setting of RSSI value to communication environment design of communications device.Thus, if the RSSI value, is then automatically selected the setting of the present invention with transmit power amplifier 9 shutoffs more than or equal to threshold value.
In addition, if be identified as than 26 meters far away with the RSSI value, that is, be lower than in RSSI value under the situation of threshold value, the power amplifier 9 that then sends usefulness is connected, and uses their route and makes transmission signal flow mistake.Its result shown in Fig. 8 (b), can communicate until 107 meters.
In addition, even under the situation of the quite numerous and diverse working environment of turnover, from Fig. 8 (f) of the analog result of representing 3 power laws as can be known, if in the scope about 7 meters, it is no problem even the then use under such harsh and unforgiving environments, expectation also can communicate.Therefore, under according to the situation of 3 power laws, be the value corresponding with 7 meters communication distance with the threshold setting of RSSI value to communication environment design of communications device.Thus, if the RSSI value, is then automatically selected the setting of the present invention with transmit power amplifier 9 shutoffs more than or equal to threshold value.
In addition, if be identified as than 7 meters far away with the RSSI value, the power amplifier 9 that then sends usefulness is connected, and uses their route and makes the signal flow mistake, shown in Fig. 8 (c), all can communicate until 22 meters.
In addition, under the situation of above-mentioned the 4th execution mode (break-make of the low noise amplifier 4 of receiving terminal), about which kind of degree this threshold setting is arrived, as Fig. 9 of expression analogue data.Because the conditions of simulation etc. are identical with Fig. 8, so omit explanation.
(the 7th execution mode)
Below, illustrate that various signals that the communication protocol of using the control method that receives according to the transmission of determining communicator generates judge the quality of communications status, use this result of determination to come power amplifier 9 or low noise amplifier 4 are carried out the example of break-make.
Figure 16 represents by WLAN (Local Area Network), the structure of terminal (EP:EndPoint), server and client that the communication protocol of using with sound conversation that is used to carry out (for example situation of VoIP described later) between (for example situation of stream transmission described later) between server/client or terminal/terminal (EP) or video distribution etc. is relevant.
As the concrete example of such application, stream transmission and VoIP (Voice over InternetProtocol) are arranged.Stream transmission and VoIP are the receiving multimedia data and the application of reproducing, but the application from server to the unidirectional transmission of client is called stream transmission with multi-medium data, distinguish with the VoIP of two-way communication.That is, VoIP is the two-way application of communicating by letter of carrying out phone, so-called two-way audio communication, image and sound on IP network.
As shown in figure 16, be layered as terminal (EP), server, client based on the structure of the communication of WLAN and amount to seven layers.
Ground floor (RF:Radio Frequency) is a physical layer, determines to be used for the actual such communication specification of for example IEEE802.11b of carrying out radio communication via access point (AP).
The second layer (MAC/BB:Media Access Control/Back Baseband) is a data link layer, is identified for data are sent as grouping the agreement of reception.
The 3rd layer (IP:Internet Protocol) is network layer, is identified for transmitting to computer from computer the agreement of data.
The 4th layer (UDP/TCP:User Datagram Protocol/Transmission Control Protocol) is transport layer, for all grouping zero defects be sent to the other side, determine and the relevant agreement of control procedure that improves the quality of communicating by letter.
Layer 5 (RTP:Real Time Protocol) is a presentation layer, the relevant agreement of packet format when determining the exchange with the continuous data that is used for video data or voice data etc.
Layer 6 (reception buffer) is the low layer of application layer, determines receiving according to RTP after the formative grouping, is used for the interim to a certain degree agreement of preserving of grouping according to various application.
Layer 7 (video, audio frequency, RTCP:Real Time Control Protocol) is the high level of application layer, determines the interface processing of decoding etc. with video data of will encode based on RTP or voice data etc. or is used to define the relevant agreement of control and treatment of the relation of terminal room.
Figure 17 represents the power supply of described low noise amplifier 4 and power amplifier 9 is carried out the various information of the described control device 18 of being input to of break-make.Various information like this are the information that obtains by based on the data processing of variety of protocol illustrated in fig. 16, as the back describes in detail, are the information about the state of communicating by letter between server and client.Control device 18 is by the so various information of reference, make described first control signal of generating unit 18a generation corresponding to communications status, make control part 18b generate described second control signal simultaneously, transmit the first and second such control signals to the receiving circuit portion that comprises low noise amplifier 4 and power amplifier 9 with as the RF circuit part 43 of transtation mission circuit portion.
Thus, signal carries out bypass to low noise amplifier 4 or power amplifier 9 amplification path by with the switching of bypass route 22 (32), low noise amplifier 4 when selecting bypass route 22 (32) or the power remove of power amplifier 9, be controlled by the result that the quality of the communications status of control device 18 is judged.
In above-mentioned various information, comprise TCP information, UDP information, RTP information, RTCP information, A/V media information and reception buffer information.
TCP information generates by the data processing along with the 4th layer TCP.TCP is the agreement that can confirm whether the data that the send communicator by the other side is correctly received.When the other side's communicator has correctly received data, ack (acknowledgement) information is sent to the communicator of transmitting terminal.Therefore, the communicator of transmitting terminal receives ack information by the communicator from the other side, and the communicator that can carry out the other side has correctly received the affirmation of data.
Have again, TCP is the communicator transmission information at transmitting terminal, and in the time-out time of regulation when failing to receive this ack information, what repeat data sends out the agreement of sending out again until the number of times that receives ack information or stipulate again, also can be used as the information of representing the quality of communications status by the threshold value of sending out number of times again.And set the threshold to multistage just passable.
UDP information generates by the data processing along with the 4th layer UDP, is the information of the mistake degree of the data that receive of expression.That is, UDP information carry out to judge that by UDP the processing (so-called verification and) of its mistake generates.Have, UDP is an agreement of simplifying communication process again, so as with the handing over to of the data of application layer in only generate necessary information.In the present embodiment, video data and voice data are sent to the communicator of receiving terminal along with following RTP and UDP.
UDP information still is illustrated in the information that the two states of mistake or zero defect is arranged in the data of reception, also can in the mistake degree threshold value be set, and represents the information of the quality of communications status as passing threshold, and, also can set the threshold to multistage.
RTP information generates by the data processing along with the RTP of layer 5, is that the communicator of the packet count of the data that send from now on the communicator of transmitting terminal and receiving terminal is waited for the relevant information of time that the communicator of the time (time stamp) that receives or receiving terminal will reproduce.Have, RTP information is sent to the communicator of receiving terminal by TCP from the communicator of transmitting terminal, receives which type of data from now on so the communicator of receiving terminal can be known in advance again.
But, in the communicator of receiving terminal, ignore the grouping of forfeiture or the grouping that postpone to distribute, the grouping that receives in the time of waiting at the communicator of receiving terminal is reproduced just passable successively, even postpone the grouping that distributes, also can the former state reproduction.Adopt which kind of mode, depend on the design of application.
RTCP information is that the packet count of information relevant with the communication conditions of the severity of mixing up of network and recipient's inbound pacing etc. and the data that send from now on the communicator of transmitting terminal and the communicator of receiving terminal are waited for the relevant information (SR:sender report) of time that receives.Have again, in RTP, do not carry out the function of the communication corresponding,, can increase and decrease the transfer rate of multi-medium data and conveying capacity etc. by utilizing RTCP with situation.
The A/V media information generates by the application of layer 7, is the information of the information itself of video data or voice data etc., the time that will reproduce and information that whether the expression anti-mistake instrument among video CODEC (Compression and DECompression) or the audio frequency CODEC that is included in moves etc.Have again, during mistake that anti-mistake instrument is found to omit in the data etc., in these data, implement interpolation or correction.
Reception buffer information generates by layer 6, is and preserves the required relevant information of time of data that receives in the communicator of receiving terminal in reception buffer.Have, about reception buffer information, the back is described in detail again.
Below, it is good to illustrate that control device 18 is judged as communications status, thereby generating unit 18a is generated be used for signal first control signal that low noise amplifier 4 or power amplifier 9 carry out bypass, control part 18b is generated be used for the situation of second control signal that the power supply to low noise amplifier 4 or power amplifier 9 turn-offs.
(1) based on the judgement of TCP information
Communicator by receiving terminal, the communicator of transmitting terminal TCP of no use is returned nack and when returning ack, it is good that the control device 18 of receiving terminal is judged as communications status according to such TCP information, and its result turn-offs the power supply of low noise amplifier 4 by control part 18b.
On the other hand, communicator by transmitting terminal, when receiving ack from the communicator of receiving terminal TCP reception nack (sending out request again) of no use, it is good that the control device 18 of transmitting terminal is judged as communications status according to such TCP information, its result is by the power supply of control part 18b switch-off power amplifier 9.
(2) based on the judgement of UDP information
In the communicator of receiving terminal, with the verification of UDP with do not produce mistake, or the mistake degree is when being less than or equal to threshold value, and it is good that the control device of receiving terminal is judged as communications status according to such UDP information, turn-offs the power supply of low noise amplifier 4 by control part 18b.
(3) based on the judgement of RTP information and RTCP information
In the communicator of receiving terminal, the described SR that compares RTP information and RTCP, when the content of the reception situation of the reality of data and advance notice is consistent, it is good that the control device 18 of receiving terminal is judged as communications status according to such RTP information and RTCP information, its result is by the power supply of control part 18b shutoff low noise amplifier 4.
Have, the RTP information here is that the communicator of receiving terminal detects and to have received what groupings or received the grouping of how many bytes or received how much divide into groups information of gained in what seconds again.
(4) based on the judgement of RTP information and A/V media information
Relatively by detected grouping due in of RTP and the A/V media information (will reproduce the time information of (or decoding)) that goes out with the applying detection of receiving terminal, when the relation of the time information of grouping due in＜reproduce is set up, it is good that the control device 18 of receiving terminal is judged as communications status according to such RTP information and A/V media information, its result is by the power supply of control part 18b shutoff low noise amplifier 4.This relation is set up, the communicator that means receiving terminal receive to this to reproduce the time be carved with the data of nargin.
Be described more specifically this point.For example, shown in Figure 18 (a), under the situation of vision signal, come the sample video signal as chronomere, form the coded data of frame part (33msec part) with 33msec.That is, with video signal conversion be coded data v1, v2, v3, the v4 etc. of a plurality of frames.In the head of each frame, write from the elapsed time in the moment that begins to sample.
In Figure 18 (a), the data length of coded data v1 etc. is described of all kindsly.This is because under the situation of video data, and data volume changes at any time because of rest image or live image or a plurality of live images that move or the character that moves few images such as live image.
With respect to from server to time that client sends (t, t+a, t+b, t+c) continuously, coded data v1 etc. are discontinuous by the time that client receives.That is, the time-dependent that received by client such as data v1 between server and client communications status and change.
Therefore, shown in Figure 18 (a), for example, and although data v1 is received by client during the time T that will reproduce, the phenomenon of the reception that may cause data v3 in not during the time T that will reproduce+2.
Have, client is grasped the time that will reproduce of each frame by RTP time for reading information from the head of each frame again.
Represent that for voice signal the figure of same case is Figure 18 (b).Under the situation of voice signal, for example, in AMR (Adaptive multirate coder) mode, be that chronomere comes sampled voice signal with 20msec, form the coded data of frame part (20msec part).Same with the situation of vision signal, in the head of each frame, write from the elapsed time in the moment that begins to sample.
Under the situation of voice signal, for certain sampling time and the amount of coded data is substantially the same.Therefore, shown in Figure 18 (b), each data length of the coded data v ' 1 of voice signal, v ' 2, v ' 3, v ' 4 equates.About the explanation of transmitting time and the time that will reproduce, same with the explanation of vision signal.
(5) based on the judgement of A/V media information
In the communicator of receiving terminal, under the situation that the anti-mistake instrument that comprises in described video CODEC or audio frequency CODEC does not move, it is good that the control device 18 of receiving terminal is judged as communications status according to such A/V media information, its result is by the power supply of control part 18b shutoff low noise amplifier 4.
Secondly, with above-mentioned opposite situation under, that is, it is poor that control device 18 is judged as communications status, its result, the example of connecting by control part 18b under the power supply situation of low noise amplifier 4 or power amplifier 9 is following like that.
(1) based on the judgement of TCP information
Communicator for receiving terminal, when the communicator of transmitting terminal is returned nack n time with TCP is continuous, it is poor that the control device 18 of receiving terminal is judged as communications status according to such TCP information, and its result connects the power supply of low noise amplifier 4 by control part 18b.
On the other hand, for the communicator of transmitting terminal, when the communicator of receiving terminal had received nack n time with TCP is continuous, it is poor that the control device 18 of transmitting terminal is judged as communications status according to such TCP information, its result is by the power supply of control part 18b connection power amplifier 9.
Have, above-mentioned example is an example again, replaces the read-around ratio of nack, also can be with the frequency of the nack of time per unit as judgment standard.Perhaps, also the relation between the data length that can consider and divide into groups is determined read-around ratio or frequency (for example, when data length is long, increasing number of times etc.) as the nack of judgment standard.
(2) based on the judgement of UDP information
In the communicator of receiving terminal, with the verification of UDP with produced mistake, or the mistake degree is when surpassing threshold value, and it is poor that the control device of receiving terminal is judged as communications status according to such UDP information, its result is by the power supply of control part 18b connection low noise amplifier 4.Have, also the relation between the data length that can consider and divide into groups is determined above-mentioned threshold value again.
(3) based on the judgement of RTP information and RTCP information
In the communicator of receiving terminal, the described SR that compares RTP information and RTCP, when the content of the reception situation of the reality of data and advance notice is inconsistent, it is poor that the control device 18 of receiving terminal is judged as communications status according to such RTP information and RTCP information, its result is by the power supply of control part 18b connection low noise amplifier 4.
(4) based on the judgement of RTP information and A/V media information
Relatively by detected grouping due in of RTP and the A/V media information (will reproduce the time information of (or decoding)) that goes out with the applying detection of receiving terminal, when the relation of the time information of grouping due in＞reproduce is set up, it is poor that the control device 18 of receiving terminal is judged as communications status according to such RTP information and A/V media information, its result is by the power supply of control part 18b connection low noise amplifier 4.
(5) based on the judgement of A/V media information
In the communicator of receiving terminal, under the situation of the anti-mistake action of tool that in described video CODEC or audio frequency CODEC, comprises, it is poor that the control device 18 of receiving terminal is judged as communications status according to such A/V media information, its result is by the power supply of control part 18b connection low noise amplifier 4.
For example, in the compression coding mode of the vision signal of stipulating by MPEG-4,, generate coded data by vision signal according to certain rule.When the decoding of this coded data, can correctly detect the error detection occurs data that meet certain rule by above-mentioned anti-mistake instrument, can judge whether mistake is arranged in coded data.The result of this judgement, anti-mistake instrument is carried out error correction when detecting mistake from coded data.
Have again, also can control, report the communicator of transmitting terminal with the result that the quality of the communications status of the communicator of receiving terminal is judged, judge, come the power supply of the power amplifier 9 of the communicator of transmitting terminal is turned on and off according to the quality of the communicator of receiving terminal.
For example, although in the communicator of transmitting terminal, can not detect communications status bad (promptly, power amplifier 9 is turn-offed), but when the communicator of receiving terminal detects communications status bad, connect the power supply of low noise amplifier 4 at receiving terminal after, carry out connecting the control of power amplifier 9 by communicator separately at transmitting terminal.Its result, communications status is according to circumstances and synergistically good.
On the contrary, because it is little at RSSI described in the communicator of transmitting terminal, so in the situation that power amplifier 9 is connected, the communicator of receiving terminal detects the excellent communications state, so communicator by the situation report transmitting terminal that communications status is good, although thereby receiving terminal turn-offs the power supply of low noise amplifier 4, transmitting terminal also can be carried out the control of switch-off power amplifier 9 by communicator separately.Its result, generation can suppress the cooperative effect of power consumption of both sides' communicator.
(6) intrinsic judgement among stream transmission and the VoIP
Below, illustrate intrinsicly in each application of stream transmission and VoIP to turn on and off control.Different reason is in response to using in the processing that turns on and off control of power supply, and the using method of reception buffer is different.
At first, in stream transmission, from server to the client folk prescription to transmitting data, so even have the data that keep a certain degree in the reception buffer of client, the user can't discern the speciality of the data of delay.This is that user only audiovisual sends and reproduced data from reception buffer because whether being retained in reception buffer with data has nothing to do.Certainly, communication speed changes at any time because of the state of network, the method that in application, transmits and reproduce so data are retained in the reception buffer back to a certain degree, and the user can enjoy the reproduction of nature.
The information of the bit rate (T) of the data that client sends from the server reception from server and necessary buffering capacity (B).Thus, client can be asked for according to the formula of t=B/T (sec) these data are retained in the time required in the reception buffer (total buffer time).The quality of communications status, the total buffer time t that relatively obtains in this calculating by the control device 18 and data of actual reception are retained in buffer time t ' required in the reception buffer (t and t ' are equivalent to described reception buffer information) judge.That is, in the buffered of client, if the relation of t '≤t is set up, then to be judged as communications status good for control device 18, and its result turn-offs the power supply of low noise amplifier by control part 18b.
On the other hand, in the buffered of client, if the relation of t '＞t is set up, then control device 18 is judged as communications status and worsens, and its result connects the power supply of low noise amplifier 4 by control part 18b.And in stream transmission, when reception buffer was empty in the reception of data, because the reception of data stagnates, so control device 18 is judged as communications status and worsens, its result connected the power supply of low noise amplifier 4 by control part 18b.
Have, server depends on content and changes to the buffering capacity (B) of client request, is not certain again.In addition, for bit rate (T), because of the troubled water of communication line changes.In client, after the data volume that reservation is scheduled in reception buffer, data are sent application from reception buffer, begin to reproduce.
The memory capacity of reception buffer is bigger than above-mentioned buffering capacity (B), so even the data volume that is input in the reception buffer surpasses from the situation of the data volume of reception buffer output, also the data that receive can be retained in the reception buffer.In addition, server can also be grasped the buffering capacity and the data volume that can send of the reception buffer of client.
Secondly, in VoIP, between server and client, or between communicator, owing to set up session by carrying out two-way audio communication, so have the speciality of not allowing the receive delay of voice data basically.Therefore, different with stream transmission, in VoIP, do not carry out buffered.
Therefore, in VoIP, in the communicator of receiving terminal, if voice data also can be decoded continuously in the conversation, then this state is imported into control device 18 as the A/V media information.Thus, it is good that control device 18 is judged as communications status, and its result turn-offs the power supply of low noise amplifier 4 by control part 18b.
On the other hand, when the decoding of voice data was interrupted in conversation, its state was imported into control device 18 as the A/V media information.Thus, control device 18 is judged as communications status to be worsened, and its result is by the power supply of control part 18b connection low noise amplifier 4.
Have again, when conversation, detect the no acoustic intelligence that does not have the sound input, be sent to the other side then, so must interrupt the decoding of voice data by sound CODEC generation.
More than, use the various signals that generate according to communication protocol to judge that the processing of the quality of communications status roughly is divided into 6 kinds as (1)～(6) and is illustrated control device 18.Below, in order to determine to carry out the judgement order of (1)～(6) and the power connection and the shutoff of low noise amplifier 4, the condition of attaching in the judgement of (1)～(6) is described.
Carry out (1)～judgement of (6) is the order according to the numeral of (1)～(6) in proper order.This order is identical with the order of judging rapidly according to communication protocol.Therefore, control device 18 comes the quality of implements communication state to judge according to the order of (1)～(6).
And, as collateral condition, in first mode of the power supply of connecting low noise amplifier 4, by any one of (1)～(6), even the phenomenon of communications status difference takes place once to represent, it is poor that control device 18 just is judged as communications status, connects the power supply of low noise amplifier 4 by control part 18b.
In addition, as collateral condition, in second mode of the power supply of connecting low noise amplifier 4, for (1)～(4), after taking place once to represent the phenomenon of communications status difference, it is poor that control device 18 is judged as communications status, connects the power supply of low noise amplifier 4 by control part 18b.And then, for (5), (6), allow that the threshold value of the phenomenon of expression communications status difference takes place n time, after taking place n time, it is poor that control device 18 is judged as communications status, connects the power supply of low noise amplifier 4 by control part 18b.
Have, in above-mentioned second mode, for (1)～(4), the frequency of the phenomenon of expression communications status difference is not defined as 1 time again.That is,, in (1)～(6), also can independently set from the permissible threshold value of viewpoint of the reliability of communication for the frequency of the phenomenon of representing the communications status difference.
In addition, for n time threshold value, also can will recur the situation of phenomenon of expression communications status difference or situation about taking place among at interval at preset time as further collateral condition.
And, as collateral condition, in first mode of the power supply that turn-offs low noise amplifier 4, in all (1)～(6), after the phenomenon of expression communications status difference fully took place, it is good that control device 18 is judged as communications status, turn-offs the power supply of low noise amplifier 4 by control part 18b.
And, as collateral condition, in second mode of the power supply that turn-offs low noise amplifier 4, in (1)～(4), after the phenomenon that expression communications status difference fully takes place, it is good that control device 18 is judged as communications status, turn-offs the power supply of low noise amplifier 4 for the time being by control part 18b.Then, for (5), (6), the frequencies of the phenomenon of 18 pairs of control device expression communications status difference are counted, when either party of each frequency reaches threshold value, control device 18 is judged as communications status to be worsened, and turn-offs the power supply of low noise amplifier 4 by control part 18b.
And, as collateral condition, in the Third Way of the power supply that turn-offs low noise amplifier 4, frequency for the phenomenon of representing the communications status difference, the independent setting respectively in (1)～(6) from the permissible threshold value of viewpoint of the reliability of communication, before frequency surpassed threshold value in (1)～(6) any one, it is good that control device 18 is judged as communications status, turn-offs the power supply of low noise amplifier 4 by control part 18b.
Below, gather other characteristic points of the present invention.
(1) in above-mentioned wireless communication circuit, the expectation control device is controlled the switching of first switch according to the signal strength signal intensity of received signal.
Therefore, can differentiate the distance of carrying out between the radio communication reliably, correctly be switched to the bypass route in short-term, can improve the sustainable time of communication, and realize energy-conservationly, simultaneously can carry out radio communication reliably in above-mentioned distance.
(2) in above-mentioned wireless communication circuit, control device preferably has generating unit, and this generating unit generates according to first control signal of controlling the switching of first switch as the received signal intensity index value (RSSI) of the signal strength signal intensity of received signal.
Thus, use the RSSI that in the digital signal processing circuit of baseband processing circuitry portion, is provided with usually, can simplify circuit structure.
(3) in above-mentioned wireless communication circuit, expectation also comprises the second switch that the power supply of pair amplifier is transferred, and control device has the control part that also generates second control signal that second switch is controlled with the first switch interoperation.
Thus, when selecting the bypass route, can also be by the open circuit power supply of pair amplifier of second switch, can be energy-conservation and improve sustainable time of communication.
(4) in above-mentioned wireless communication circuit, also can in the bypass route, comprise fixed attenuator.In above-mentioned wireless communication circuit, also can in the bypass route, comprise variable attenuator.
Thus, except " improving the duration of battery " and " energy-saving design " adopted by former state, very near with the distance of main frame, thereby automatically be chosen as under the situation of signal by the route of fixed attenuator or variable attenuator, since near with the distance of main frame, so when receiving sensitivity worsens because of distorted characteristic, improve distorted characteristic by the attenuation of fixed attenuator, consequently, can be extended to the closely arrival distance (scope) of side.In addition, comprising under the situation of variable attenuator, but for example when walking is held PDA or portable phone etc. and communicated, changing with real-time mode with the distance of main frame, so more effective.
In addition, as WLAN, under situation about communicating simultaneously in the zone of a plurality of radio communication devices in appointment, by in the bypass route, comprising fixed attenuator or variable attenuator, when communication counterpart is in closely, reduce the output of mutual transmission signal, and then can suppress to occupy the communication band of other radio communication devices, produce situation about disturbing simultaneously.
(5) in above-mentioned wireless communication circuit, amplifier also can be the power amplifier that amplifies the transmission signal that transmits to antenna.In above-mentioned wireless communication circuit, amplifier also can be the low noise amplifier that amplifies from the received signal of antenna.Thus, can bring into play the duration of battery " improve " and ' energy-saving design " effect, particularly under the situation of power amplifier, as mentioned above, can bring into play above-mentioned effect significantly reliably.
(6) wireless communication circuit of the present invention is used to solve above-mentioned problem, amplifier with amplifying signal, it is characterized in that, routing arrangement is set, select a ground select the amplification path of signal by described amplifier by and signal one of them of bypass route of described amplifier being carried out bypass.
One object of the present invention is, provide and to carry out self and other radio communication circuits of excellent communications all in low consumption electric power mode, so according to said structure, when the method for amplifying signal can be carried out good transmission or be received, by routing arrangement, can select amplification path by.
In addition, the method for amplifying signal not, owing to be suppressed at the distortion that produces in the signal, the communicator to other does not produce interference simultaneously, so can carry out by routing arrangement, can selecting the bypass route under the situation of good transmission or reception.In this case, owing to do not use amplifier, so can suppress the power consumption of radio communication circuit.
(7) intensity of the signal that preferably receives according to described wireless communication circuit of above-mentioned routing arrangement, select amplification path by with one of them of bypass route.
Thus, according to the intensity of the signal that changes constantly because of communication distance and communication environment, can carry out amplification path by with the switching of bypass route.Therefore, can change the state of the power consumption of telecommunication circuit according to communication distance and communication environment.
(8) above-mentioned routing arrangement preferably surpasses pre-set threshold and during more than or equal to threshold value, selects the bypass route in the intensity of the signal that receives.
Thus, surpassing pre-set threshold and during more than or equal to threshold value in the intensity of the signal that receives, is the situation of intensity that does not need to amplify the signal of reception, so by selecting the bypass route, can carry out excellent communications by low consumption electric power.
(9) above-mentioned routing arrangement preferably includes control device, and described control device is judged the quality of the communications status of above-mentioned wireless communication circuit, and according to result of determination generate select above-mentioned amplification path by with one of them first control signal of bypass route.
According to said structure because various principal elements all are related to the quality of communications status, so the amplification path that can consider various principal elements by with the switching of bypass route.That is, can control consumption electric power meticulously by more mode.
(10) above-mentioned routing arrangement comprises control device, described control device is judged the quality of the communications status of above-mentioned wireless communication circuit, and according to result of determination generate select above-mentioned amplification path by with one of them first control signal of bypass route, it is characterized in that, when even above-mentioned control device is lower than pre-set threshold and is less than or equal to threshold value in the intensity of the signal of above-mentioned wireless communication circuit reception, also be judged to be under the good situation of communications status, generate first control signal of selecting the bypass route.
According to said structure, when the intensity of the signal that receives at above-mentioned wireless communication circuit is lower than pre-set threshold and is less than or equal to threshold value, because a little less than the signal that receives, so comprise situation about will amplify.But, even a little less than the signal that receives, if but communications status is good, then also without any problem.Therefore, not only judge the intensity of the signal that receives, also judge, can improve the actual effect of low consumption electric power control by the quality that increases communications status.
(11) above-mentioned routing arrangement comprises control device, described control device is judged the quality of the communications status of above-mentioned wireless communication circuit, and according to result of determination generate select above-mentioned amplification path by with one of them first control signal of bypass route, it is characterized in that, even the intensity of the signal that above-mentioned control device receives at above-mentioned wireless communication circuit surpasses pre-set threshold and during more than or equal to threshold value, also be judged to be under the situation of communications status difference, generate to select amplification path by first control signal.
According to said structure, the intensity of the signal that receives at above-mentioned wireless communication circuit surpasses pre-set threshold and during more than or equal to threshold value, because the signal that receives is strong, so comprise the situation of amplifying of not needing.But, even the signal that receives is strong, if but communications status is poor, then can not carry out excellent communications.Therefore, not only judge the intensity of the signal that receives, also judge, thereby can consider low consumption electric power, improve the reliability of communication simultaneously by the quality that increases communications status.
(12) have again, be judged to be under the good situation of communications status, comprising at above-mentioned control device:
(a) above-mentioned control device is resolved the content of the information signal that receives from the other side's communicator and is judged as the ack situation of (being fit to confirmation of receipt);
(b) above-mentioned control device detects the mistake degree of the reception data of the signal generation that is received by above-mentioned wireless communication circuit, surpasses the situation of threshold value at the mistake degree that detects;
(c) the consistent situation of content of predicting from the communicator of communication counterpart before the reception of the reception situation of the reception data that generate of the signal that receives by above-mentioned wireless communication circuit and above-mentioned signal;
(d) above-mentioned control device is from the reception data that the signal that is received by above-mentioned wireless communication circuit generates, obtain the time information of the application that will carry out relevant these reception data, the time of reception of more above-mentioned signal and above-mentioned time information, and be judged as the reception data situation consistent of above-mentioned signal with the moment that will carry out application;
(e) situation of utilizing the anti-mistake instrument that comprises in the application of the reception data that the signal that received by above-mentioned wireless communication circuit generates not move;
(f) the reception data that generate at the signal that is received by above-mentioned wireless communication circuit are streaming data, above-mentioned wireless communication circuit comprises under the situation of reception buffer of these reception data of interim reservation, above-mentioned control device receives bit rate with these reception data from the communicator that sends above-mentioned reception data, and be used for keeping the relevant information of the required buffering capacity of these reception data temporarily, ask for according to bit rate and buffering capacity these reception data are retained in total buffer time t required in the reception buffer, relatively will receive the actual result who is retained in buffer time t ' required in the reception buffer and total buffer time t of data, the situation that the relation of t '≤t is set up;
(g) communicator that possesses above-mentioned wireless communication circuit carries out under the situation of two-way communication at the communicator with communication counterpart, the continuous and decoded various situations such as situation of the reception data that the signal that is received by above-mentioned wireless communication circuit generates.
Therefore, monitor by various viewpoints whether utilization is carried out suitably by the application of the reception data of the signal generation of above-mentioned wireless communication circuit reception, is carried out suitably if use simultaneously, then can select to use the low consumption power mode of bypass route.And, judge by the power of the additional signal that receives in the quality of communications status is judged, can improve the actual effect of low consumption electric power control.
(h) have, in the reception of above-mentioned reception data, under the empty situation of above-mentioned reception buffer, it is poor that above-mentioned control device is judged to be communications status again.
In this case, in the reception that receives data, the empty situation of above-mentioned reception buffer is to have produced interference in the reception that receives data.Therefore, as the measure of taking of the communicator of receiving terminal, select amplification path by and the intensity of attempting amplifying the signal that receives just can.
(13) and, relevant with the various situations of above-mentioned (a)～(h), be judged to be setting threshold in the bad number of times of communications status at above-mentioned control device, be lower than threshold value and be less than or equal under the situation of threshold value at this number of times, it is good just passable that above-mentioned control device is judged to be communications status.
Thus,, change the setting of threshold value, so can consider the low consumption electric power control with flexibility of the reliability standard of communication according to the reliability of communication will be guaranteed which kind of degree is just passable.
(14) and, wireless communication circuit of the present invention has the feature that comprises the power remove device, power remove device and above-mentioned routing arrangement have been selected the situation interoperation of bypass route, turn-off the power supply of above-mentioned amplifier is supplied with.
According to said structure, selected the situation interoperation of bypass route with above-mentioned routing arrangement, the power remove device turn-offs the power supply of pair amplifier and supplies with, so further suppress to consume electric power, for example can prolong the duration of internal battery.In addition, also have following effect: do not have noise from amplification path by the danger of sneaking into the bypass route.
(15) radio communication circuit of the present invention is used to solve above-mentioned problem, it is characterized in that, in the wireless communication circuit of the amplifier with amplifying signal, comprising: the communication distance checkout gear of the distance of detection and communication counterpart; And routing arrangement, according to the distance that above-mentioned communication distance checkout gear detects, select the amplification path of signal by above-mentioned amplifier by and signal above-mentioned amplifier is carried out one of them route of the bypass route of bypass.
According to said structure, if exist near with the distance of communication counterpart, then the signal that receives from communication counterpart is strong, if distance with communication counterpart, the trend a little less than the signal that receives from communication counterpart then, so according to the distance that detects switch amplification path by with the bypass route, thereby can control consumption electric power according to accepting state.
Have again, for example, the storage part of the data that can be associated and constitute the communication distance checkout gear according to the determination section of the above-mentioned data decision communication distance corresponding with the intensity of detection by the test section of the intensity that detects received signal, with the intensity and the communication distance of received signal.
(16) have, above-mentioned routing arrangement selects the bypass route just can when detected distance with communication counterpart by above-mentioned communication distance checkout gear is bigger than predefined value again.
Thus, surpass pre-set threshold and during more than or equal to threshold value, can obtain and select the same effect of bypass routing condition in the intensity of the signal that receives.
(17) radio communication device of the present invention is used to solve above-mentioned problem, it is characterized in that, has above-mentioned any one described wireless communication circuit.
Therefore, can realize the duration of battery " improve " and " energy-saving design " in the radio communication device.
(18) wireless communication system of the present invention is used to solve above-mentioned problem, it is characterized in that, has above-mentioned radio communication device.
Therefore, can realize the duration of battery " improve " and " energy-saving design " in the wireless communication system.
Concrete execution mode or embodiment in the detailed description of the invention item, but be to be used to understand technology contents of the present invention, and should only not be defined in such concrete example and explained by narrow sense ground, in the scope of spirit of the present invention and claims record, can carry out various changes and enforcement.
Meter ".
(18) wireless communication system of the present invention is used to solve above-mentioned problem, it is characterized in that, has above-mentioned radio communication device.
Therefore, can realize the duration of battery " improve " and " energy-saving design " in the wireless communication system.
Concrete execution mode or embodiment in the detailed description of the invention item, but be to be used to understand technology contents of the present invention, and should only not be defined in such concrete example and explained by narrow sense ground, in the scope of spirit of the present invention and claims record, can carry out various changes and enforcement.

Claims (18)

1. wireless communication circuit has the amplifier (4,9) of amplifying signal, and described wireless communication circuit is provided with:
Make amplification path that signal passes through described amplifier by; And
Select a ground and select to make one of them routing arrangement (18,18a, 23,24) of the bypass route (22,32) of signal bypass by described amplifier,
Wherein, described routing arrangement (18,18a, 23,24) comprises control device (18), described control device is judged the quality of the communications status of described wireless communication circuit, according to its result of determination generate select described amplification path by with one of them first control signal of bypass route (22,32)
Under the consistent situation of the content that described control device (18) was predicted from the communicator of communication counterpart before the reception situation of the reception data that the signal that receives according to described wireless communication circuit generates and reception at above-mentioned signal, it is good to be judged to be communications status.
2. wireless communication circuit has the amplifier (4,9) of amplifying signal, and described wireless communication circuit is provided with:
Make amplification path that signal passes through described amplifier by; And
Select a ground and select to make one of them routing arrangement (18,18a, 23,24) of the bypass route (22,32) of signal bypass by described amplifier,
Wherein, described routing arrangement (18,18a, 23,24) comprises the quality of the communications status of judging described wireless communication circuit, according to its result of determination generate select described amplification path by with one of them the control device (18) of first control signal of bypass route (22,32)
When even described control device is less than or equal to pre-set threshold in the intensity of the signal of described wireless communication circuit reception, still be judged to be under the good situation of communications status, generate first control signal of selecting the bypass route, under the consistent situation of the content that described control device (18) was predicted from the communicator of communication counterpart before the reception situation of the reception data that the signal that receives according to described wireless communication circuit generates and reception at above-mentioned signal, it is good to be judged to be communications status.
3. wireless communication circuit has the amplifier (4,9) of amplifying signal, and described wireless communication circuit is provided with:
Make amplification path that signal passes through described amplifier by; And
Select a ground and select to make one of them routing arrangement (18,18a, 23,24) of the bypass route (22,32) of signal bypass by described amplifier,
Wherein, described routing arrangement (18,18a, 23,24) comprises the quality of the communications status of judging described wireless communication circuit, according to its result of determination generate select described amplification path by with one of them the control device (18) of first control signal of bypass route (22,32)
Even the intensity of the signal that described control device receives at described wireless communication circuit is during more than or equal to pre-set threshold, still be judged to be under the situation of communications status difference, generate to select amplification path by first control signal, under the consistent situation of content that described control device (18) was predicted from the communicator of communication counterpart before the reception situation of the reception data that the signal that receives according to described wireless communication circuit generates and reception at above-mentioned signal, it is good to be judged to be communications status.
4. as any one described wireless communication circuit of claim 1 to 3, wherein, described control device (18) the communicator from the other side of sending information signal do not receive this information signal send out request again the time, it is good to be judged to be communications status.
5. as any one described wireless communication circuit of claim 1 to 3, wherein, described control device (18) detects the mistake degree of the reception data that the signal that receives according to described wireless communication circuit generates, and when detected mistake degree did not surpass threshold value, it was good to be judged to be communications status.
6. as any one described wireless communication circuit of claim 1 to 3, wherein, described control device (18) is from the reception data that the signal that receives according to described wireless communication circuit generates, obtain the temporal information that to carry out the application relevant with these reception data, the time of reception of more described signal and described temporal information, when the reception data that are judged as described signal were consistent with the time that will carry out application, it was good to be judged to be communications status.
7. as any one described wireless communication circuit of claim 1 to 3, wherein, when the anti-mistake instrument that described control device (18) comprises in the application of the reception data of utilizing the signal that receives according to described wireless communication circuit to generate did not move, it was good to be judged to be communications status.
8. as any one described wireless communication circuit of claim 1 to 3, wherein, be included in reception data that the signal that receives according to described wireless communication circuit generates when being flow data, preserve the reception buffer of these reception data temporarily,
Information that described control device (18) receives the bit rate of these reception data and is used for preserving the required relevant buffering capacity of described reception data from the communicator that sends described reception data temporarily, ask for according to bit rate and buffering capacity these reception data are kept at total buffer time t required in the reception buffer, be kept at buffer time t ' required in the reception buffer and total buffer time t compares with these reception data are actual, when the relation of t '≤t was set up, it was good to be judged to be communications status.
9. wireless communication circuit as claimed in claim 8, wherein, in the reception of described reception data, when described reception buffer became empty, it is poor that described control device (18) is judged to be communications status.
10. as any one described wireless communication circuit of claim 1 to 3, wherein, when the communicator of communicator that possesses described wireless communication circuit and communication counterpart carries out two-way communication, if the reception data that the signal that receives according to described wireless communication circuit generates are by continuous decoding, it is good that then described control device (18) is judged to be communications status.
11. as any one described wireless communication circuit of claim 1 to 3, wherein, described control device (18) is setting threshold in judging the non-good number of times of described communications status, is less than or equal at this number of times under the situation of threshold value, and it is good that described control device is judged to be communications status.
12. as any one described wireless communication circuit of claim 1 to 3, wherein, described routing arrangement (18,18a, 23,24) comprises and selects consistent action of bypass route (22,32), thereby shutoff is to the power remove device of the power supply supply of described amplifier (4,9).
13. as any one described wireless communication circuit of claim 1 to 3, wherein, described amplifier (4,9) is the power amplifier that amplifies the signal that will send.
14. as any one described wireless communication circuit of claim 1 to 3, wherein, described amplifier (4,9) is the low noise amplifier that amplifies the signal that receives.
15., wherein, in described bypass route (22,32), be provided with the attenuator (22a, 32a, 22b, 32b) that makes signal attenuation as any one described wireless communication circuit of claim 1 to 3.
16., wherein, in described bypass route (22,32), be provided with the variable variable attenuator of attenuation rate (22b, 32b) as any one described wireless communication circuit of claim 1 to 3.
17. a radio communication device comprises any one described wireless communication circuit of claim 1 to 3.
18. a wireless communication system comprises any one described wireless communication circuit of claim 1 to 3.
CNB2004100899682A 2003-09-30 2004-09-30 Wireless communication circuit, wireless communication apparatus, and wireless communication system Expired - Fee Related CN100388634C (en)

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