CN102149180B - Method and mobile terminal for compensating omnidirectional radiation power - Google Patents
Method and mobile terminal for compensating omnidirectional radiation power Download PDFInfo
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- CN102149180B CN102149180B CN201110077273.2A CN201110077273A CN102149180B CN 102149180 B CN102149180 B CN 102149180B CN 201110077273 A CN201110077273 A CN 201110077273A CN 102149180 B CN102149180 B CN 102149180B
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Abstract
The embodiment of the invention provides a method and a mobile terminal for compensating omnidirectional radiation power. The method for compensating the omnidirectional radiation power comprises the steps as follows: a return loss signal is received; demodulation is implemented on the return loss signal to obtain the voltage value of a demodulation signal; a transmission power is increased according to the voltage value of the demodulation signal so as to compensate the omnidirectional radiation power. The method and the mobile terminal for compensating the omnidirectional radiation power can be adopted to automatically and effectively adjust the omnidirectional radiation power of the mobile terminal under the condition that a head, hand or other article approach to an antenna of the mobile terminal.
Description
Technical field
The present invention relates to mobile communication technology field, relate in particular to a kind of compensation isotropically radiated power method and mobile terminal.
Background technology
Isotropically radiated power (TRP) refers to the mean value of mobile terminal external radiant power of transmitter in omnirange, is commonly used to evaluate the wireless radiation performance of mobile terminal.Radianting capacity is stronger, and the wireless performance of terminal is better, better with the concatenation ability of network.
In the actual use of mobile terminal, when the head of human body, hand or other objects are during near antenna, also in the situation that of head, hand or other object proximity mobile terminal antennas, the field boundary condition of mobile terminal and antenna can change, antenna is to space impedance mismatching, and the isotropically radiated power of this mobile terminal can worsen.
In prior art, the method of TRP in the situation of raising head, hand or other object proximity mobile terminal antennas is generally by trial, to change antenna form to improve, but, because boundary condition constantly changes, can only blindly attempt, efficiency is very low, and in the situation of correct, hand or other object proximity mobile terminal antennas the TRP of mobile terminal to improve effect also poor.
Summary of the invention
The embodiment of the present invention provides a kind of compensation isotropically radiated power method and mobile terminal, can, the in the situation that of head, hand or other object proximity mobile terminal antennas, adjust automatically, efficiently the isotropically radiated power of mobile terminal.
In order to solve the problems of the technologies described above, the technical scheme of the embodiment of the present invention is as follows:
On the one hand, provide a kind of compensation isotropically radiated power method, having comprised:
Receive return loss signal;
Described return loss signal is carried out to the magnitude of voltage that detection obtains rectified signal;
According to the magnitude of voltage of described rectified signal, increase conducted power, to compensate isotropically radiated power.
On the other hand, also provide a kind of mobile terminal, having comprised:
Signal receiving unit, for receiving return loss signal;
Detection unit, for carrying out the magnitude of voltage of detection acquisition rectified signal to described return loss signal;
Compensating unit, for increasing conducted power according to the magnitude of voltage of described rectified signal, to compensate isotropically radiated power.
The embodiment of the present invention is by receiving return loss signal, obtain the rectified signal of return loss signal, and according to the magnitude of voltage of rectified signal, the isotropically radiated power of mobile terminal is compensated, thereby the in the situation that of head, hand or other object proximity mobile terminal antennas, how automatically to have solved, adjusted efficiently the problem of the isotropically radiated power of mobile terminal.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is a kind of compensation isotropically radiated power of embodiment of the present invention method flow diagram;
Fig. 2 is the another kind of compensation of embodiment of the present invention isotropically radiated power method flow diagram;
Fig. 3 is that the signal of mobile terminal inside in the embodiment shown in Fig. 2 is processed schematic diagram;
Fig. 4 is the another kind of compensation of embodiment of the present invention isotropically radiated power method flow diagram;
Fig. 5 is the another kind of compensation of embodiment of the present invention isotropically radiated power method flow diagram;
Fig. 6 is that the signal of mobile terminal inside in the embodiment shown in Fig. 5 is processed schematic diagram;
Fig. 7 is the structural representation of a kind of mobile terminal of the embodiment of the present invention;
Fig. 8 is the structural representation of the another kind of mobile terminal of the embodiment of the present invention;
Fig. 9 is the structural representation of the another kind of mobile terminal of the embodiment of the present invention.
Embodiment
In order to make those skilled in the art can further understand feature of the present invention and technology contents, refer to following about detailed description of the present invention and accompanying drawing, accompanying drawing only provide with reference to and explanation, be not used for limiting the present invention.
Below in conjunction with drawings and Examples, technical scheme of the present invention is described.
Embodiment 1
Referring to Fig. 1, it is a kind of compensation isotropically radiated power of embodiment of the present invention method flow diagram.
The method can comprise:
Return loss signal refers to that on transmission line, because port does not mate, signal transmission does not spread out of by port completely, and the reflected signal of the part signal transmission producing.In the present embodiment, can regularly or receive in real time return loss signal, also can be detecting to the end, hand or other object near time trigger and receive return loss signal, can also be also to trigger and receive return loss signal under other condition.The process of concrete reception return loss signal, can be chosen on the circuit between antenna feed point place or antenna feed point place and antenna match place, by coupler or electric capacity etc., return loss signal is transferred to wave detector, carries out next step.
After receiving return loss signal, further this signal is carried out to detection, obtain the magnitude of voltage of rectified signal.
The antenna mismatch of mobile terminal is more serious, and isotropically radiated power deterioration is more serious, and the return loss signal now receiving is also stronger, and the rectified signal magnitude of voltage that return loss signal demodulator is obtained is also just larger, need to be also just more to the compensation of isotropically radiated power.
Isotropically radiated power is that the conducted power of mobile terminal is gone out by aerial radiation, and isotropically radiated power is directly proportional to the size of conducted power, so the conducted power increasing can partly be used for compensating isotropically radiated power.
The mode that increases conducted power has multiple, can according to affect conducted power size because usually determining, conducted power is the power by the power amplifier output of mobile terminal, so the size of conducted power depends on the related work parameter of mobile terminal power amplifier.
In embodiments of the present invention, the process that increases conducted power can adopt different means to realize for the different systems of mobile terminal, for example, increases the control voltage of mobile terminal power amplifier according to the magnitude of voltage of rectified signal; Or according to the size of radiofrequency signal of the magnitude of voltage increase mobile terminal transceiver platform chip output of rectified signal and the gain amplifier of power amplifier etc., the concrete description that refers to subsequent embodiment repeats no more herein.
The embodiment of the present invention is by receiving return loss signal, and according to the rectified signal magnitude of voltage to return loss signal, the isotropically radiated power of mobile terminal is compensated, thereby the in the situation that of head, hand or other object proximity mobile terminal antennas, how automatically to have solved, adjusted efficiently the problem of the isotropically radiated power of mobile terminal.
Embodiment 2
Referring to Fig. 2, it is the another kind of compensation of embodiment of the present invention isotropically radiated power method flow diagram.
In the present embodiment, to take the radio hand-held equipment of GSM standard be example to mobile terminal, and the method can comprise:
In the present embodiment, the return loss signal at the point of reception antenna feedback in real time place, adjusts in real time and compensates the isotropically radiated power of mobile terminal so that follow-up.Step 101 in this step and previous embodiment is similar, repeats no more herein.
In the present embodiment, specifically can to the return loss signal receiving, carry out detection and amplification in real time by wave detector and operational amplifier, obtain output signal level and be also the magnitude of voltage after the amplification of rectified signal.This magnitude of voltage is larger, needs the compensation of isotropically radiated power just more.
In the present embodiment, to the compensation way of mobile terminal isotropically radiated power, be the voltage according to rectified signal, increase the control voltage of mobile terminal power amplifier, with the conducted power of increasing power amplifier output, and then realize the compensation to isotropically radiated power.
Suppose before compensation, the control voltage of power amplifier is the first magnitude of voltage, after compensation, this control voltage increases to second voltage value, wherein increase value can be directly proportional to the magnitude of voltage of rectified signal, or be certain linear functional relation between the two, or be certain nonlinear function between the two, certainly also can also directly equal the magnitude of voltage of this rectified signal.
Concrete, as shown in Figure 3, in mobile terminal, by transceiver platform chip 31, to power amplifier 32, sent the output radiofrequency signal of mobile terminal, the control voltage of simultaneously being inputted this power amplifier 32 to power amplifier 32 by transceiver platform chip 31, to control the size of the conducted power of this power amplifier output.After the magnitude of voltage of rectified signal that obtains return loss signal, can be by the magnitude of voltage of this rectified signal and transceiver platform chip 31 to the magnitude of voltage of the control signal of power amplifier 32 inputs (also i.e. the first magnitude of voltage), adopt adder 33 to be added, the magnitude of voltage that addition is obtained and (being also second voltage value) as control voltage, input to power amplifier 32, increase the conducted power of these power amplifier 32 outputs, and then increase the isotropically radiated power of this mobile terminal.
The embodiment of the present invention is by receiving return loss signal, and according to the control voltage of the power amplifier of the rectified signal voltage increase mobile terminal of return loss signal, thereby increased conducted power, thereby the in the situation that of head, hand or other object proximity mobile terminal antennas, how automatically to have solved, adjusted efficiently the problem of the isotropically radiated power of mobile terminal.
Embodiment 3
Referring to Fig. 4, be the method for adjustment flow chart of embodiment of the present invention another kind with the isotropically radiated power of adaptation mechanism.
The method can comprise:
This step 401,402 and previous embodiment in step 201,202 similar, repeat no more herein.
In the present embodiment, can according to experimental data, set up in advance the corresponding relation of the control voltage of rectified signal voltage and power amplifier.This experimentation can be to obtain after the voltage of a rectified signal, and the control voltage of continuous increasing power amplifier, to increase isotropically radiated power, until the isotropically radiated power producing reaches required value.Then, set up the magnitude of voltage of this rectified signal and the corresponding relation between the final control magnitude of voltage of adjusting.This corresponding relation can be stored in the form of list in the transceiver platform chip of this mobile terminal.
Return loss signal demodulator is being obtained after rectified signal, directly this rectified signal is sent to transceiver platform chip, by this transceiver platform chip according to the magnitude of voltage of this rectified signal, search corresponding relation list, for example the magnitude of voltage of rectified signal is A, according to this corresponding relation list, the control magnitude of voltage of the power amplifier that magnitude of voltage A is corresponding is B.
The control voltage that is B by this magnitude of voltage when transceiver platform chip adds after power amplifier, can control the conducted power that this power amplifier output meets the demands, then obtain the isotropically radiated power satisfying the demands, the former isotropically radiated power worsening in the situation with retrieving head, hand or other object proximity mobile terminal antennas.
The embodiment of the present invention is by receiving return loss signal, and according to the power-level detector of return loss signal, transfer the control voltage of power amplifier, and to controlling voltage, adjust accordingly, with output, meet conducted power and the isotropically radiated power of power requirement, thereby the in the situation that of head, hand or other object proximity mobile terminal antennas, how automatically to have solved, adjusted efficiently the problem of the isotropically radiated power of mobile terminal.
Embodiment 2 and embodiment 3 are the modes to power amplifier control voltage of transceiver platform chip output that change according to rectified signal voltage, isotropically radiated power is compensated, by increase, control voltage, the conducted power that has increased power amplifier output, has realized the adaptive equalization of isotropically radiated power.Which goes for the mobile terminal of GSM standard etc.
Embodiment 4
Referring to Fig. 5, it is the another kind of compensation of embodiment of the present invention isotropically radiated power method flow diagram.
The method can comprise:
Step 501, the return loss signal at reception antenna feedback point place.
Step 502, carries out to return loss signal the magnitude of voltage that detection obtains rectified signal.
This step 501,502 and previous embodiment in step 401,402 similar, repeat no more herein.
Step 503, according to the corresponding relation of the rectified signal voltage of setting up in advance and the size of transceiver platform chip signal output and the power amplification of power amplifier gain, search the size of the corresponding transceiver platform chip signal output of magnitude of voltage and the power amplification of the power amplifier gain of the rectified signal of detection acquisition.
In the present embodiment, can according to experimental data, set up the size of radiofrequency signal of rectified signal voltage and the output of mobile terminal transceiver platform chip and the corresponding relation of the power amplification of power amplifier gain in advance.This experimentation can be to obtain after the magnitude of voltage of a rectified signal, constantly increase the output signal of mobile terminal transceiver platform chip, and the power amplification of increasing power amplifier gain, until the isotropically radiated power being sent by antenna increases to required value, then, set up the corresponding relation between this rectified signal magnitude of voltage and the power amplification gain of the final transceiver platform chip signal output size of adjusting and power amplifier.This corresponding relation can be stored in the transceiver platform of this mobile terminal with the form of list.
As shown in Figure 6, return loss signal demodulator is being obtained after rectified signal, directly this rectified signal is sent to transceiver platform chip 61, by transceiver platform chip 61, search corresponding relation list, for example rectified signal magnitude of voltage is C, according to this corresponding relation list, the output signal of the transceiver platform chip that it is corresponding size is D, and the power amplification gain of power amplifier is E.
Step 504, according to the size of transceiver platform chip signal output finding and the power amplification of power amplifier gain, power amplification gain to the output signal of mobile terminal transceiver platform chip and power amplifier is adjusted, with the conducted power of increasing power amplifier output.
According to the corresponding relation finding, transceiver platform chip 61 is the output signal of D to power amplifier 62 output sizes, and the gain amplifier of this power amplifier 62 is adjusted to E, and concrete can adjust the gain shift corresponding with this yield value.By adjusting, can increase the conducted power of these power amplifier 62 outputs, and then increase the isotropically radiated power of exporting by antenna, thereby can compensate the former isotropically radiated power of deterioration.
The embodiment of the present invention is by receiving return loss signal, and transfer corresponding parameter to increase isotropically radiated power according to the rectified signal voltage of return loss signal, realized the adaptive equalization of isotropically radiated power, thereby the in the situation that of head, hand or other object proximity mobile terminal antennas, how automatically to have solved, adjusted efficiently the problem of the isotropically radiated power of mobile terminal.
Embodiment 4 compensates isotropically radiated power according to the mode of rectified signal voltage adjustment transceiver platform output signal and power amplifier gain amplifier.Which goes for as the mobile terminal of CDMA standard, WCDMA standard or TD-SCDMA standard.
Be more than the description to embodiment of the present invention method, to realizing the device of said method, be introduced below.
Embodiment 5
Referring to Fig. 7, it is the structural representation of a kind of mobile terminal of the embodiment of the present invention.
This mobile terminal can comprise:
Signal receiving unit 701, for receiving return loss signal.
Compensating unit 703, for increasing conducted power according to the magnitude of voltage of rectified signal, to compensate isotropically radiated power.
In the present embodiment, signal receiving unit 701 can regularly or receive return loss signal in real time, also can be detecting to the end, hand or other object near time trigger and receive return loss signal, can also be also to trigger and receive return loss signal under other condition.This return loss signal can be the return loss signal that selective reception antenna feed point place launches back.At signal receiving unit 701, receive after return loss signal, detection unit 702 further carries out detection to this signal, obtains rectified signal magnitude of voltage, and this detection unit 702 can comprise wave detector and operational amplifier etc.At detection unit 702, obtain after rectified signal magnitude of voltage, compensating unit 703 compensates the isotropically radiated power of mobile terminal output signal according to this rectified signal magnitude of voltage.The antenna mismatch of mobile terminal is more serious, and isotropically radiated power deterioration is more serious, and the return loss signal now receiving is also stronger, and the rectified signal magnitude of voltage that return loss signal demodulator is obtained is also just larger, need to be also just more to the compensation of isotropically radiated power.
In another embodiment of the present invention, this compensating unit 703, can be for increase the control voltage of the power amplifier of mobile terminal according to the magnitude of voltage of rectified signal, with the conducted power of increasing power amplifier output.
The embodiment of the present invention receives return loss signal by said units, obtain rectified signal, and according to rectified signal magnitude of voltage, the isotropically radiated power of mobile terminal is compensated, thereby the in the situation that of head, hand or other object proximity mobile terminal antennas, how automatically to have solved, adjusted efficiently the problem of the isotropically radiated power of mobile terminal.
Embodiment 6
Referring to Fig. 8, it is the structural representation of the another kind of mobile terminal of the embodiment of the present invention.
This mobile terminal can also comprise signal receiving unit 801, detection unit 802, compensating unit 803.Wherein, signal receiving unit 801 and detection unit 802 are similar with signal receiving unit 701 and detection unit 702 in previous embodiment, repeat no more herein.
In the present embodiment, this compensating unit 803 can comprise again:
First searches subelement 8031, for the corresponding relation with the control voltage of power amplifier according to the rectified signal voltage of setting up in advance, searches the control magnitude of voltage of the corresponding power amplifier of magnitude of voltage of the rectified signal of detection acquisition.
The first compensation subelement 8032, for according to the control magnitude of voltage of the power amplifier finding, adjusts the control voltage of the power amplifier of mobile terminal, with the conducted power of increasing power amplifier output.
At signal receiving unit 801, receive return loss signal, detection unit 802 is according to after the magnitude of voltage of return loss signal acquisition rectified signal, first searches subelement 8031 can be according to the magnitude of voltage of this rectified signal, in pre-stored mapping table, find the control voltage of the corresponding power amplifier of this rectified signal magnitude of voltage, then the control magnitude of voltage that the first compensation subelement 8032 can find according to this, power amplifier is controlled, and then produce satisfactory conducted power, and send satisfactory isotropically radiated power by antenna.This mobile terminal can be the mobile terminal of GSM standard.
The embodiment of the present invention receives return loss signal by said units, obtain rectified signal, and according to the power-level detector of rectified signal, transfer the control voltage of power amplifier, output meets conducted power and the isotropically radiated power of power requirement, thereby the in the situation that of head, hand or other object proximity mobile terminal antennas, how automatically to have solved, adjusted efficiently the problem of the isotropically radiated power of mobile terminal.
Embodiment 7
Referring to Fig. 9, it is the structural representation of the another kind of mobile terminal of the embodiment of the present invention.
This mobile terminal also comprises signal receiving unit 901, detection unit 902, compensating unit 903.Wherein, signal receiving unit 901 and detection unit 902 are similar with signal receiving unit 701 and detection unit 702 in previous embodiment, repeat no more herein.
In the present embodiment, optional, this compensating unit 903 comprises:
Second searches subelement 9031, for according to the corresponding relation of the rectified signal voltage of setting up in advance and the size of transceiver platform chip signal output and the power amplification of power amplifier gain, search the size of the corresponding transceiver platform chip signal output of magnitude of voltage and the power amplification of the power amplifier gain of the rectified signal of detection acquisition.
The second compensation subelement 9032, for gaining according to the size of transceiver platform chip signal output finding and the power amplification of power amplifier, power amplification gain to the output signal of mobile terminal transceiver platform chip and power amplifier is adjusted, with the conducted power of increasing power amplifier output.
At signal receiving unit 901, receive return loss signal, detection unit 902 is according to after return loss signal acquisition rectified signal magnitude of voltage, second searches subelement 9031 can be according to this rectified signal magnitude of voltage, in pre-stored corresponding relation list, finding the transceiver platform chip signal output power amplification big or small and power amplifier that this rectified signal magnitude of voltage is corresponding gains, then the data that found by the second compensation subelement 9032 bases, control size and the power amplification gain of output signal, to produce satisfactory isotropically radiated power.Mobile terminal can be the radio hand-held equipment of CDMA standard, WCDMA standard or TD-SCDMA standard.
In the embodiment of the present invention, related mobile terminal includes but not limited to adopt the smart mobile phone of different system platform, non intelligent mobile phone, personal digital assistant PDA or portable equipment etc. to have the radio hand-held equipment of antenna.
The embodiment of the present invention receives return loss signal by said units, obtain rectified signal, and transfer corresponding parameter to increase isotropically radiated power according to rectified signal, improved the wireless radiation performance of mobile terminal in the situation of head, hand or other object proximity mobile terminal antennas.
Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any modification of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in claim protection range of the present invention.
Claims (10)
1. a method that compensates isotropically radiated power, is characterized in that, for mobile terminal, described method comprises:
Regularly, in real time maybe when detecting to the end, hand or other object near time, the return loss signal at reception antenna feedback point place;
Described return loss signal is carried out to the magnitude of voltage that detection obtains rectified signal;
According to the magnitude of voltage of described rectified signal, increase conducted power, to compensate isotropically radiated power.
2. method according to claim 1, is characterized in that, the described magnitude of voltage according to described rectified signal increases conducted power, comprising:
According to the magnitude of voltage of described rectified signal, increase the control voltage of the power amplifier of mobile terminal, to increase the conducted power of described power amplifier output.
3. method according to claim 1, is characterized in that, the described magnitude of voltage according to described rectified signal increases conducted power, comprising:
Corresponding relation according to the rectified signal voltage of setting up in advance with the control voltage of power amplifier, searches the control magnitude of voltage of the corresponding power amplifier of magnitude of voltage of the described rectified signal of detection acquisition;
According to the control magnitude of voltage of the power amplifier finding, the control voltage of the power amplifier of mobile terminal is adjusted, to increase the conducted power of described power amplifier output.
4. method according to claim 1, is characterized in that, the described magnitude of voltage according to described rectified signal increases conducted power, comprising:
According to the corresponding relation of the rectified signal voltage of setting up in advance and the size of transceiver platform chip signal output and the power amplification of power amplifier gain, search the size of the corresponding transceiver platform chip signal output of magnitude of voltage and the power amplification of the power amplifier gain of the described rectified signal of detection acquisition;
According to the size of transceiver platform chip signal output finding and the power amplification of power amplifier gain, power amplification gain to the output signal of mobile terminal transceiver platform chip and power amplifier is adjusted, to increase the conducted power of described power amplifier output.
5. a mobile terminal, is characterized in that, comprising:
Signal receiving unit, for regularly, in real time maybe when detecting to the end, hand or other object near time, the return loss signal that reception antenna feedback point is located;
Detection unit, for carrying out the magnitude of voltage of detection acquisition rectified signal to described return loss signal;
Compensating unit, for increasing conducted power according to the magnitude of voltage of described rectified signal, to compensate isotropically radiated power.
6. mobile terminal according to claim 5, is characterized in that,
Described compensating unit, specifically for increase the control voltage of described mobile terminal power amplifier according to the magnitude of voltage of described rectified signal, to increase the conducted power of described power amplifier output.
7. mobile terminal according to claim 5, is characterized in that, described compensating unit comprises:
First searches subelement, for the corresponding relation with the control voltage of power amplifier according to the rectified signal voltage of setting up in advance, searches the control magnitude of voltage of the corresponding power amplifier of magnitude of voltage of the described rectified signal of detection acquisition;
The first compensation subelement, for according to the control magnitude of voltage of the power amplifier finding, adjusts the control voltage of the power amplifier of described mobile terminal, to increase the conducted power of described power amplifier output.
8. according to the mobile terminal described in claim 6 or 7, it is characterized in that, described mobile terminal is the radio hand-held equipment of GSM standard.
9. mobile terminal according to claim 5, is characterized in that, described compensating unit comprises:
Second searches subelement, for according to the corresponding relation of the rectified signal voltage of setting up in advance and the size of transceiver platform chip signal output and the power amplification of power amplifier gain, search the size of the corresponding transceiver platform chip signal output of magnitude of voltage and the power amplification of the power amplifier gain of the described rectified signal of detection acquisition;
The second compensation subelement, for gaining according to the size of transceiver platform chip signal output finding and the power amplification of power amplifier, power amplification gain to the output signal of described mobile terminal transceiver platform chip and power amplifier is adjusted, to increase the conducted power of described power amplifier output.
10. mobile terminal according to claim 9, is characterized in that, the radio hand-held equipment that described mobile terminal is following arbitrary standard:
CDMA standard, WCDMA standard, TD-SCDMA standard.
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| CN106712871B (en) * | 2016-12-30 | 2021-04-20 | 宇龙计算机通信科技(深圳)有限公司 | Antenna performance optimization method and system |
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| CN100455089C (en) * | 2003-12-24 | 2009-01-21 | 中兴通讯股份有限公司 | An apparatus and method for implementing base station antenna standing-wave ratio alarm |
| CN101689892B (en) * | 2007-06-28 | 2016-06-01 | 诺基亚技术有限公司 | For having the radiant power optimization of the mobile radio emittor/receiver of antenna |
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| CN1585281A (en) * | 2003-07-30 | 2005-02-23 | Lg电子株式会社 | Transmitting apparatus and method of mobile communication terminal |
| EP1542374A1 (en) * | 2003-12-12 | 2005-06-15 | Motorola, Inc. | An echo canceler circuit and method |
| CN101384911A (en) * | 2006-02-22 | 2009-03-11 | 艾利丹尼森公司 | Method of determining performance of rfid devices |
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