CN1989752A - A transmitter and method for operating same - Google Patents

A transmitter and method for operating same Download PDF

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Publication number
CN1989752A
CN1989752A CNA2005800243375A CN200580024337A CN1989752A CN 1989752 A CN1989752 A CN 1989752A CN A2005800243375 A CNA2005800243375 A CN A2005800243375A CN 200580024337 A CN200580024337 A CN 200580024337A CN 1989752 A CN1989752 A CN 1989752A
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CN
China
Prior art keywords
time slot
power
power amplifier
amplifier
transmitter
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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CNA2005800243375A
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Chinese (zh)
Inventor
曼弗雷德·魏斯
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Nokia Oyj
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Nokia Oyj
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Priority claimed from GBGB0412188.5A external-priority patent/GB0412188D0/en
Application filed by Nokia Oyj filed Critical Nokia Oyj
Publication of CN1989752A publication Critical patent/CN1989752A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
    • H03F1/0244—Stepped control
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0277—Selecting one or more amplifiers from a plurality of amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
    • H03G3/3047—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers for intermittent signals, e.g. burst signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2003—Modulator circuits; Transmitter circuits for continuous phase modulation
    • H04L27/2007—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained
    • H04L27/2017—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained in which the phase changes are non-linear, e.g. generalized and Gaussian minimum shift keying, tamed frequency modulation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0408—Circuits with power amplifiers
    • H04B2001/045—Circuits with power amplifiers with means for improving efficiency

Abstract

A transmitter 2 comprises a power amplifier 3 and power controller 4 . The power amplifier 3 is capable of both linear and non-linear operation, and is controlled by a controller 20 and first and second control loops 21,22 . The second control loop 22 is used with the transmission of GMSK modulated signals, which have no amplitude modulation, operating the power amplifier 3 in a non-linear mode. The first control loop 21 is used for the transmission of EDGE modulated signals, which have a substantial amount of amplitude modulation, operating the power amplifier 3 in a linear mode. The first control loop 21 is also used with GMSK time slots if the output power to be produced by the power amplifier 3 is low and the power of an immediately preceding time slot is high. In this case, a sample and hold circuit 9, 10 of the first control loop 21 is used when the power detector voltage in the power amplifier would change over the time slot by cooling, avoiding the possibility of the power level varying over the time slot.

Description

The method of transmitter and operation transmitter
Technical field
The present invention relates to a kind of transmitter, and the method for operation transmitter.The present invention relates to the transmitter that uses a modulating data in first modulation scheme and second modulation scheme in a kind of each at a series of time slots especially, and be included in a series of time slots and send data, and in each time slot, data are used one method in first modulation scheme and second modulation scheme.
Background technology
Fig. 1 has described the communication equipment 1 that is set to send data in a series of time slots, for example uses in tdma system.Communication equipment 1 comprises transmitter 2, and transmitter 2 comprises power amplifier 3 and is set to the power controller 4 of control power amplifiers 3, and RX-TX switch 5 and antenna 6.Power amplifier 3 provides power to antenna 7.Controller 20 can be again to control every other assembly.RX-TX switch 5 is connected to receiver (not shown) or transmitter 2 with antenna 6.
Recently, the communication equipment that surpasses a kind of modulation scheme transmission data has appearred using.For example, Nokia (RTM) 9500 Communicator are configured such that with EDGE and use GMSK (GMSK (Guassian Minimum Shift Keying)) modulation to send data.Fig. 2 has described the part of the existing amplifier configuration 2 that is suitable for using in such communication equipment.Fig. 2 has shown the assembly of multi-mode power amplifier 3 and power controller 4.
When the modulation signal of for example EDGE signal with high degree of amplitude modulation was sent out, power amplifier 3 operated in the linear model.Power amplifier 3 uses first control loop, 21 Be Controlled, and first control loop 21 comprises the differential amplifier 7a with the feedback loop that comprises electric capacity 8a, and the sampling hold circuit that comprises electric capacity 9 and differential amplifier 10.First control loop 21 by change present to the input signal of power amplifier 3 and by the gain that is adjusted in the variable gain amplifier 11 before the power amplifier 3 power output of control power amplifiers 3.Power amplifier is formed in power amplifier 3 and variable gain amplifier 11 co-operations together.
Switch 12 between amplifier 7a and the amplifier 10 cuts out during the starting and ending of the time slot that linear transfer is used, thereby allows power output gradient under the control of input ramp signal TXC of power amplifier to rise or descend.During being used for the time slot mid portion of transfer of data, switch 12 is opened, thereby disconnects the connection between differential amplifier 7a and the feedback loop thereof.By the output control variable gain amplifier 11 of sampling hold circuit 9,10, sampling hold circuit 9,10 provides constant control voltage to variable gain amplifier then.
In the end of time slot, transmitter 2 gradients descend.Then transmitter 2 next time slot begin locate before gradient rises, by means of switch 13a, 13b, 13c power switched controller 4 between two control loops 21,22.The ramp signal TXC that use is input to relevant control loop carries out the gradient rise and fall, thus the power output of control power amplifiers 3.
For having modulation signal small or that do not have amplitude modulation(PAM), GMSK modulation signal for example, power amplifier 3 operates in the nonlinear model to improve its power efficiency.When transmitter 2 is arranged on communication equipment 1 for example in the mobile phone time, the efficient of this raising can cause the longer air time.Second control loop 22 is provided, the feedback loop that it comprises differential amplifier 7b and comprises electric capacity 8b, but do not comprise sampling hold circuit.Second control loop 22 offers the voltage of power control pin Vpctrl and control power amplifiers 3 by change.
Send the beginning and the end of the time slot of GMSK or similar modulation signal therein, the power output of power amplifier 3 gradient under the control of input ramp signal TXC rises or descends.Second control loop is at the beginning of time slot, mid portion and keep between tailend closing.This means, different with first control loop 21, second control loop 22 remains connected to diode power detector 14, and it forms the part of power amplifier 3 and the power output of monitoring power amplifier 3, and correspondingly regulates the control voltage in the whole time slot.
Power output at the power amplifier 3 that is used for transfer of data is high time slot, and the temperature of the assembly of power amplifier 3 raises.Be transferred to power detector 14 and may cause the reduction of its certainty of measurement from the heat of assembly.The measure error that causes may be the order of magnitude of every degree centigrade of 2mV, the low excessively measurement result that this may lead to errors.
If during next time slot, power amplifier 3 will operate in the nonlinear model so that the power output far below previous time slot to be provided, and the assembly of power amplifier 3 and power detector 14 can be lowered the temperature during this time slot.This temperature drift causes the drift of power detector voltage during this time slot, and the power output that causes controlling voltage and power amplifier 3 reduces during the mid portion of time slot.This does not expect.
Fig. 3 is for showing two continuous slot t 1, t 2The diagrammatic sketch of the output of power detector 14 during this time.In first time slot, power output is high and surpasses the y axle upper limit in the diagrammatic sketch.During second time slot, because the assembly of power amplifier 3 is at the first time slot t 1The heat of Sheng Chenging during this time, the temperature height of power detector 14, and the output of power detector 14 compares with the real output of power amplifier 3, starts from relatively low value.The output of power detector 14 is at the second time slot t then 2The upwards drift along with its diode cooling during this time.
For GSM900, the power output in any given time slot must be in 5 to 33dBm scope during the available part of burst, and precision is+/-1dB.When power output is 5dBm during power output during first time slot is 33dBm and ensuing time slot, the temperature drift maximum between the time slot.Fig. 4 is the power output diagrammatic sketch of two GSM 1900 time slots, is designated t equally 1, t 2, and clearly shown the second time slot t 2The downward drift of power output level during this time.
In some existing amplifier configuration, by providing temperature compensation means to solve this problem for power detector 14.Yet this need provide add-on assemble.And, the temperature compensation means not a duck soup of response temperature variation fast is provided.Power detector 14 can also be located away from power amplifier 3, and for example in US 6369635 in the disclosed configuration, thereby it can not be subjected to the appreciable impact from the heat of power amplifier component.Yet this need provide external module and increase the size of amplifier configuration 2.
Summary of the invention
According to first aspect present invention, a kind of transmitter is provided, be set in each of a series of time slots, send the data of using a modulation in first modulation scheme and second modulation scheme, described transmitter comprises:
Power amplifier is operable in linear and the nonlinear model;
Output control device is set to control the power that is provided by described power amplifier; And
Controller is set to when using described first modulation scheme in time slot the described power amplifier of control operating in the linear model, and when using described second modulation scheme in time slot the described power amplifier of control operating in the nonlinear model,
For the time slot that uses described second modulation scheme therein, described controller is set to determine whether the through-put power in the described time slot is lower than the through-put power in the back to back last time slot, and in response to sure definite result, control described power amplifier in described time slot manipulate in linear model.
Can allow to improve the responsive to temperature effect of power detector like this.
Usually, when first modulation scheme has very big amplitude modulation(PAM) content, for example modulation of EDGE transmission use, amplifier is operable in the linear model.The higher nonlinear model of efficient uses usually in second modulation scheme has constant amplitude for example in the situation of the modulation used of GMSK.
Preferably, transmitter comprises the employing holding circuit, when it operates in linear model, can operate with the gain with power amplifier and remain on the gradient rising of time slot and the substantially invariable value between the sloping portion.
Described employing holding circuit is the special effective method that prevents that power output from changing on time slot.Should use nonlinear model usually but since the transmitted power in time slot and the back to back last time slot can cause under the situation that the power of time slot changes, in linear model, use sampling hold circuit and in linear model the operand power amplifier produce two results.At first, prevented that the power in this time slot from changing.And,, cause the efficient of power amplification lower, thereby identical power output used more power because traditional efficient that operates in the amplifier in the linear model is lower.The applicant thinks, with respect to good effect described herein, promptly obtains constant power output in time slot, is the acceptable defective.
Advantage of the present invention can embody in following situation especially, if promptly power amplifier comprises first and second amplifier stages, the input of another grade is coupled in the output of an amplifier stage, wherein first amplifier stage is controlled as and has fixed gain and second amplifier stage and be controlled as and have the gain that depends on the second amplifier stage control signal that is generated by first control loop in nonlinear model, and wherein in linear model second amplifier stage be controlled as and have fixed gain and first amplifier stage and be controlled as and have the gain that depends on the first amplifier stage control signal that generates by second control loop.
At this, if second control loop comprises sampling hold circuit, can operate with the gradient that the first amplifier stage control signal is remained on time slot rise and the gradient sloping portion between substantially invariable value, if then this can help sending the data of modulating with first modulation scheme simultaneously and send data may variable power take place in the nonlinear model time when amplifier operates in time slot.
If transmitter comprises the power detector integrated with power amplifier, then do not need to provide QA temperature compensation means.It is preferred using integrated power detector, because like this can be so that equipment is less corresponding to exterior arrangement, and more cheap usually.
Second aspect according to the present invention provides a kind of method of operating transmitter, and described method comprises:
In a series of time slots, send data,
In each time slot, data are used in first modulation scheme and second modulation scheme one; And
When using described first modulation scheme in time slot the described power amplifier of control operating in the linear model, and when using described second modulation scheme in time slot the described power amplifier of control operating in the nonlinear model,
Described method further comprises for the time slot that uses described second modulation scheme therein, determine whether through-put power in the time slot is lower than the through-put power in the back to back last time slot, and in response to sure definite result, control described power amplifier in described time slot manipulate in linear model.
Description of drawings
With reference now to accompanying drawing, describe embodiments of the invention in detail, wherein:
Fig. 1 has described the transmitter that can operate according to the present invention;
Fig. 2 has described the amplifier configuration of a part that forms transmitter shown in Figure 1;
Fig. 3 shows two power output diagrammatic sketch on the continuous slot; And
Fig. 4 is the diagrammatic sketch that shows the output of power detector on two continuous slots.
Embodiment
In an embodiment of the present invention, transmitter 2 comprises power amplifier 3 and power controller 4, as depicted in figs. 1 and 2.Power amplifier 3 can operate in linear and the nonlinear model, and as above controls with reference to prior art by the controller 20 and first and second control loops 21,22 describedly.
Yet, the special use first control loop 21 in the time slot of the data-signal that has high degree of amplitude modulation in transmission, when transmission does not have the signal of amplitude modulation(PAM), if and the low and power output height that in back to back last time slot, produce of power output that produces by power amplifier 3, then use first control loop 21 equally.
For example, communication equipment 1 can be mobile transmitter, is configured such that with EDGE and GMSK modulation scheme to send data.Interchangeable, communication equipment 1 can be for moving or cell phone, perhaps any other transmitter device.Power controller 4 is configured such that with second control loop 22 and sends the GMSK modulation signal with high power, for efficiency factor in nonlinear model operand power amplifier 3.First control loop 21 is used to send the EDGE modulation signal and sends the GMSK modulation signal in some cases.
When using first control loop 21, during the core of the time slot of aforesaid transmission data, switch 12 is opened, and uses sampling hold circuit 9,10 control power amplifiers 3.Because power detector 14 disconnects and being connected of variable gain amplifier 11 by sampling hold circuit 9,10, its output does not have to influence to the control signal that is applied to variable gain amplifier 11.Therefore, any variation of the temperature of power detector 14 can not influence the control of power amplifier 3 and the power output of power amplifier 3.
When sending data in the GMSK time slot, controller 20 determines whether operand power amplifier 3 in linearity or nonlinear model.Common, controller 20 is selected nonlinear model.When yet power output was high in the low and back to back last time slot when power output, controller 20 power controlling controllers 4 were to use first control loop 21 and control power amplifiers 3 to operate in the linear model.
When using first control loop 21 to operate in the linear model, the efficient of power amplifier 3 is lower than the situation of using second control loop 22 to operate in nonlinear model.Yet by eliminating the drift of the power output that is caused by the variations in temperature in the power detector 14, the loss of efficient is cancelled.
Power controller 4 can followingly be arranged so that power amplifier 3 can be in the time slot manipulate in linear model, during this time slot will with, promptly send under any power level of the power output of using in being lower than back to back last time slot in the time slot of the non-signal that does not have an amplitude modulation(PAM), power amplifier 3 operates in the linear model.Interchangeable ground, power controller 4 can use predetermined power threshold to determine whether the power output that provides during the time slot is " low ".For example, described threshold value can define according to power level, perhaps replacedly is defined as the predetermined ratio of the peak power output that power amplifier 3 can provide.
Because the power inefficient rate relevant with operand power amplifier in linear model 3, preferably, only when favourable to GMSK time slot use linear model.Owing to just can during time slot, produce the cooling of power detector 14 largely when only the power output in the low and last time slot is high when the power output in the time slot, preferably only use linear model in this case.Determine whether power is high or low definite scheme can depend on realization.Especially, the degree of the heating and cooling of power detector 14 can be the selection that depends on some assembly.Preferably, only, just the GMSK time slot is used linear model when power during far below last time slot.This can by with the power output between the time slot than comparing with predetermined threshold or determining in any other suitable manner.
The present invention may be embodied as the Digital Signal Processing software that is configured to control transmitter 2.
Although the communication equipment of above reference example such as mobile phone has been described embodiments of the invention, can in any portable or fixing data transmitting equipment, use according to amplifier configuration of the present invention, comprise base station transmitter, and be particularly suitable for mixed mode data transmission devices.
In addition, the present invention is not limited to comprise the amplifier configuration of control loop shown in Figure 2.Especially, whether to be positioned at power amplifier 3 unimportant for power detector 14.

Claims (8)

1. transmitter is set to send the data of using a modulation in first modulation scheme and second modulation scheme in each of a series of time slots, and described transmitter comprises:
Power amplifier is operable in linear and the nonlinear model;
Output control device is set to control the power that is provided by described power amplifier; And
Controller, be set to when using described first modulation scheme in time slot the described power amplifier of control to operate in the described linear model, and when using described second modulation scheme in time slot the described power amplifier of control to operate in the described nonlinear model
For the time slot that uses described second modulation scheme therein, described controller is set to determine whether the through-put power in the described time slot is lower than the described through-put power in the back to back last time slot, and in response to sure definite result, control described power amplifier in described time slot manipulate in described linear model.
2. transmitter according to claim 1 comprises sampling hold circuit, when it is operated in linear model, can operate with the gain with described power amplifier and remain on the gradient rising of time slot and the substantially invariable value between the gradient sloping portion.
3. transmitter according to claim 1, wherein said power amplifier comprises first and second amplifier stages, the input of another grade is coupled in the output of an amplifier stage, wherein be controlled as and have fixed gain and described second amplifier stage and be controlled as and have the gain that depends on the second amplifier stage control signal that generates by first control loop, and wherein be controlled as and have fixed gain and described first amplifier stage and be controlled as and have the gain that depends on the first amplifier stage control signal that generates by second control loop at second amplifier stage described in the described linear model at first amplifier stage described in the described nonlinear model.
4. transmitter according to claim 3, wherein said second control loop comprises sampling hold circuit, can operate with the gradient that the described first amplifier stage control signal is remained on time slot rise and the gradient sloping portion between substantially invariable value.
5. according to the transmitter described in arbitrary aforementioned claim, comprise and the integrated power detector of described power amplifier.
6. a communication equipment comprises according to the transmitter described in arbitrary aforementioned claim.
7. a radio telephone comprises according to any one described transmitter in the claim 1 to 5.
8. method of operating transmitter, described method comprises:
In a series of time slots, send data,
In each time slot, data are used in first modulation scheme and second modulation scheme one; And
When using described first modulation scheme in time slot the described power amplifier of control operating in the linear model, and when using described second modulation scheme in time slot the described power amplifier of control operating in the nonlinear model,
Described method further comprises for the time slot that uses described second modulation scheme therein, determine whether through-put power in the described time slot is lower than the through-put power in the back to back last time slot, and in response to sure definite result, control described power amplifier in described time slot manipulate in described linear model.
CNA2005800243375A 2004-06-01 2005-05-24 A transmitter and method for operating same Pending CN1989752A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GBGB0412188.5A GB0412188D0 (en) 2004-06-01 2004-06-01 A transmitter and a method of operating a transmitter
GB0412188.5 2004-06-01
US10/936,511 2004-09-09
US10/936,511 US7177607B2 (en) 2004-06-01 2004-09-09 Controlling transmission mode on basis of power in preceding time slot
PCT/IB2005/051690 WO2006033026A1 (en) 2004-06-01 2005-05-24 A transmitter and a method of operating a transmitter

Publications (1)

Publication Number Publication Date
CN1989752A true CN1989752A (en) 2007-06-27

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Application Number Title Priority Date Filing Date
CNA2005800243375A Pending CN1989752A (en) 2004-06-01 2005-05-24 A transmitter and method for operating same

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EP (1) EP1751943A1 (en)
CN (1) CN1989752A (en)
WO (1) WO2006033026A1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3171157B2 (en) * 1997-12-10 2001-05-28 松下電器産業株式会社 Nonlinear distortion compensator
DE19964024A1 (en) * 1999-12-30 2001-07-05 Nokia Mobile Phones Ltd Temperature compensated diode rectifier circuit for an HF level controller
US6853246B2 (en) * 2002-04-18 2005-02-08 Agere Systems Inc. Adaptive predistortion system and a method of adaptively predistorting a signal

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WO2006033026A1 (en) 2006-03-30

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Open date: 20070627