WO2010000184A1 - 一种改善发射机效率的方法和发射机 - Google Patents

一种改善发射机效率的方法和发射机 Download PDF

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Publication number
WO2010000184A1
WO2010000184A1 PCT/CN2009/072443 CN2009072443W WO2010000184A1 WO 2010000184 A1 WO2010000184 A1 WO 2010000184A1 CN 2009072443 W CN2009072443 W CN 2009072443W WO 2010000184 A1 WO2010000184 A1 WO 2010000184A1
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Prior art keywords
gain
digital signal
power
input digital
transmitter
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PCT/CN2009/072443
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English (en)
French (fr)
Inventor
刘烨
马凡妮
陈小红
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华为技术有限公司
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Publication of WO2010000184A1 publication Critical patent/WO2010000184A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/02Transmitters
    • H04B1/04Circuits
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F1/00Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F1/00Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0261Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the polarisation voltage or current, e.g. gliding Class A
    • H03F1/0266Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the polarisation voltage or current, e.g. gliding Class A by using a signal derived from the input signal
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F3/00Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/24Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/02Transmitters
    • H04B1/04Circuits
    • H04B2001/0408Circuits with power amplifiers
    • H04B2001/045Circuits with power amplifiers with means for improving efficiency

Definitions

  • the present invention relates to the field of communication technologies, and in particular, to a method and a transmitter for improving the efficiency of a transmitter.
  • Power amplifier the tube is called power amplifier.
  • the performance of the power amplifier of a wireless base station is related to a variety of factors, all of which may result in lower transmitter efficiency. For example, the bias voltage applied by the wireless base station to the power amplifier of the transmitter has a large impact on transmitter efficiency.
  • the bias voltage of the transmitter power amplifier is adjusted according to the output power.
  • the output power is large, a higher bias voltage is required to ensure the linearity of the power amplifier, and the signal distortion is reduced.
  • the service load rate is low, the output power is reduced, and if the power amplifier bias point does not change at this time, The amplifier is less efficient. Therefore, when the power output of the power amplifier is small, the method of lowering the bias voltage of the power amplifier is usually adopted to reduce the static power consumption.
  • the bias voltage of the power amplifier includes the gate voltage and the drain voltage. To improve the efficiency of the power amplifier at a low load rate, it is usually necessary to adjust the leakage voltage of the power amplifier together with the gate voltage.
  • Embodiments of the present invention provide a method and a transmitter for improving transmitter efficiency, which can effectively improve transmitter efficiency.
  • Embodiments of the present invention provide a method for improving the efficiency of a transmitter power amplifier.
  • the method converts an input digital signal into an analog signal and outputs the same to a power amplifier through a transmission channel, and further includes:
  • the wave threshold limits the input digital signal to be clipped
  • the bias voltage of the power amplifier is adjusted according to a bias voltage reference value set according to different average power levels.
  • the embodiment of the invention further provides a transmitter, the transmitter includes a digital-to-analog converter, converts the input digital signal into an analog signal and outputs the same to the power amplifier through the transmitting channel, and further includes: a first power statistic, Mean for counting the average power of the input digital signal;
  • a clipping processor configured to perform clipping processing on the input digital signal according to a clipping threshold set according to different average power levels according to an average power output by the first power statistic, and output the digital signal to the digital simulation converter;
  • a voltage controller configured to adjust, according to the average power obtained by the first power statistic, a bias voltage of the power amplifier according to a bias voltage reference value set according to different average power levels.
  • the bias voltage of the power amplifier is adjusted according to the bias voltage reference value set according to different power levels, so as to reduce
  • the power consumption of the power amplifier saves the power consumption of the device; and according to the statistical average power, the input digital signal is clipped according to the clipping threshold set according to different power levels, and after the signal is clipped, the transmission can be reduced.
  • the linearity requirement of the internal power amplifier makes the power amplifier reduce the back-off, so it can effectively improve the transmitter efficiency.
  • FIG. 1 is a block diagram of a first embodiment of a transmitter according to an embodiment of the present invention
  • FIG. 2 is a flowchart of Embodiment 1 of a method for improving transmitter efficiency in an embodiment of the present invention
  • FIG. 3 is a block diagram of Embodiment 3 of a transmitter according to an embodiment of the present invention
  • Figure 4 is a block diagram of the transmit channel of the transmitter shown in Figure 3;
  • FIG. 5 is a block diagram of the feedback channel of the transmitter shown in Figure 3;
  • Figure 6 is a block diagram showing the closed loop adjustment gain of the transmitter shown in Figure 3.
  • Embodiments of the present invention provide a method and transmitter for improving transmitter efficiency, which can effectively improve transmitter efficiency.
  • FIG. 1 is a block diagram of a first embodiment of a transmitter according to an embodiment of the present invention.
  • a digital domain baseband I/Q signal passes through a clipping processor 11, it is converted into an analog signal by a digital-to-analog converter (DAC) 12, and the DAC 12 outputs
  • the analog signal is input to the power amplifier (PA) via the transmission channel 13, and the signal output from the PA 14 is transmitted through the antenna 15.
  • PA power amplifier
  • the transmitter of Embodiment 1 further includes:
  • the first power statistic 16 is configured to count the average power of the input digital signal (digital domain baseband in-phase/quadrature (I/Q) signal);
  • the clipping processor 11 is configured to, according to the average power output by the first power statistic 16, perform clipping processing on the input digital signal according to the clipping threshold set according to different average power levels, and output the signal to the DAC 13;
  • the voltage controller 17 is configured to adjust the bias voltage of the PA 14 according to the bias voltage reference value set according to the different average power levels based on the average power counted by the first power statistic 16.
  • the bias voltage includes the gate voltage and the drain voltage of the power amplifier.
  • the different power levels set correspond to different clipping thresholds and power amplifier bias voltage reference values.
  • FIG. 2 is a flowchart of Embodiment 1 of a method for improving the efficiency of a transmitter according to an embodiment of the present invention.
  • the transmitter passes the average power of the input baseband signal, and is clipped by the clipping processor according to the average power obtained by the statistics according to the clipping threshold corresponding to the set average power level, by the voltage controller.
  • the average power obtained according to the statistics is adjusted according to the bias voltage reference value corresponding to the set average power level, wherein by adjusting the bias voltage of the power amplifier, the power consumption of the power amplifier can be reduced, thereby reducing the power consumption of the transmitter.
  • Clipping the input digital signal can reduce the linearity of the power amplifier in the transmitter, so that the power amplifier can reduce the back-off. This embodiment can effectively improve transmitter efficiency.
  • the gain of the input digital signal can be adjusted, as illustrated by the specific embodiment:
  • the second embodiment of the transmitter compensates for the fluctuation of the gain during power amplifier voltage regulation by means of open loop, that is, the control voltage presets the compensation amount for different output power levels.
  • This scheme can be realized by means of equipment during production. Assume that the gain of the power amplifier is constant, and the bias voltage values at different power levels are obtained. Actually, during the production commissioning process, the gain is not stable when the power is placed in the voltage regulation, and can be adjusted based on the original bias voltage. Once the gain reaches a stable value, the voltage offset at that time is recorded and written into the memory device of the base station in the form of a table or the like (the power-down information is not lost).
  • the voltage controller 17 is further configured to update the offset set according to different average power levels in the first embodiment of the transmitter according to the pre-stored corresponding offset voltage offset.
  • Transmitter Embodiment 3 Adjusting the gain by using a closed loop manner. Referring to FIG. 3, it is a block diagram of Embodiment 3 of the transmitter in the embodiment of the present invention:
  • the digital domain baseband I/Q signal is converted into an analog signal by a digital-to-analog converter (DAC) 33 through the clipping processor 31 and the second power statistic unit 32, and the analog signal output from the DAC 33 is sent to the power amplifier via the transmitting channel 34 (PA). 35, the power amplifier output signal is coupled to the feedback channel 37 through the coupler 36, and the feedback RF signal is converted into an analog intermediate frequency or analog baseband signal through the feedback channel 37, and then converted into a digital signal by an analog-to-digital converter (ADC) 38.
  • ADC analog-to-digital converter
  • the second power statistic 32 is then input to form a closed loop of the transmit and feedback channels.
  • the second power statistic 32 is used for statistically clipping the digital signal (digital domain baseband)
  • the power of the I/Q signal and the power of the signal returned by the feedback channel 37 obtain the actual gain of the input digital signal, and adjust the gain of the transmit channel to the input signal based on the set target gain and the actual gain of the input digital signal.
  • the transmit channel 34 may include modulation.
  • the transmit channel includes a modulator, and the analog baseband I/Q signal output from the DAC 33 is modulated by the modulator onto the carrier frequency and transmitted through the antenna 39.
  • the transmitting channel 34 may include an up-converter, and the up-converter may also be referred to as a mixer, and the analog intermediate frequency signal outputted from the DAC 33 and the local oscillator signal are mixed and then up-converted to the carrier frequency.
  • a gain adjuster 343 such as an analog, digitally controlled attenuator or variable gain amplifier can be used.
  • the feedback channel 37 may include a down converter or analog demodulator 371 for downconverting the power amplifier coupled RF signal to an analog intermediate frequency.
  • the signal is either converted to an analog baseband I/Q signal by an analog demodulator whose function is opposite to that of the upconverter, the effect of the analog demodulator being opposite to that of the modulator.
  • the analog signal is filtered and converted from analog to digital by the ADC.
  • the feedback channel can also include an amplifier 372. 3 44 and filter 373.
  • the device representations indicated by dashed lines in Figures 4 and 5 are optional.
  • FIG. 6 which is a block diagram of the closed loop adjustment gain shown in FIG. 3 .
  • the output power of the clipping processor 31 is PDin
  • the gain of the entire transmission channel and the PA 35 is GF
  • the signal output by the power amplifier is set.
  • Let the total gain of the feedback channel be GR, and the second power statistic 32 counts the digital power of the feedback signal of the feedback channel as PR, then PR-GR Pout.
  • PR and GF can be corrected by the production equipment, which is a fixed value.
  • the second power statistic device 32 can calculate the gain change value: PDin+GF-(PR-GR), and adjust the gain adjuster such as the attenuator or the variable gain amplifier on the transmitting channel. This implementation can be simulated. Implemented on the channel.
  • the gain can also be adjusted in the digital domain to further improve the transmitter efficiency.
  • only the power of the digital signal after the clipping process and the power of the signal returned by the feedback channel are counted by the second power statistic unit 32.
  • no circuitry or device with gain adjustments such as attenuators or variable gain amplifiers is required on the transmit channel.
  • the gain of the input signal can be adjusted based on the first embodiment of the method:
  • the digital power of the input digital signal can be adjusted to adjust the gain of the input digital signal based on the set target gain and the actual gain of the input digital signal.
  • the gain of the transmit channel to the input signal can also be adjusted based on the set target gain and the actual gain of the input digital signal. Adjusting the gain of the transmit channel to the input signal according to the set target gain and the actual gain of the input digital signal, specifically: controlling the attenuator on the transmit channel according to the set target gain and the actual gain of the input digital signal
  • a variable gain amplifier is used to adjust the gain of the transmit channel to the input signal.
  • the method for improving the efficiency of the transmitter is described above by using a specific application. It can be understood that the method and the transmitter of the embodiment of the present invention are applicable to UMTS (Universal Mobile Telecommunications System) and CDMA2000 (Code Division Multiple Access). 2000, Wideband Code Division Multiple Access (2000), LTE (Long Time Evolution, Long Term Evolution), Wimax (Worldwide Interoperability for Microwave Access), and other base stations or terminal equipment.
  • UMTS Universal Mobile Telecommunications System
  • CDMA2000 Code Division Multiple Access
  • 2000 Wideband Code Division Multiple Access
  • LTE Long Time Evolution, Long Term Evolution
  • Wimax Worldwide Interoperability for Microwave Access
  • the bias voltage of the power amplifier is adjusted according to a bias voltage reference value set according to different average power levels.
  • the above-mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Transmitters (AREA)

Description

一种改善发射机效率的方法和发射机
本申请要求于 2008 年 06 月 30 日提交中国专利局、 申请号为 200810125273.3、 发明名称为 "一种改善发射机效率的方法和发射机" 的中国 专利申请的优先权, 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信技术领域, 尤其涉及一种改善发射机效率的方法和发射 机。
背景技术
功率放大器, 筒称功放。 无线基站的功放性能与多种因素有关, 这些因素 都有可能导致发射机效率较低。例如, 无线基站对发射机的功放所施加的偏置 电压对发射机效率有很大影响。
为了改善发射机效率,在现有技术中,根据输出功率来调整发射机功放的 偏置电压。 当输出功率大时, 需要较高的偏置电压来保证功放的线性度, 减小 信号失真; 而在业务负载率低时, 输出功率减小, 此时的功放偏置点如果没有 变化, 则功放效率较低。 因此, 当功放输出功率小时, 通常采取降低功放的偏 置电压的方法, 来降低静态功耗。 功放的偏置电压包括栅压和漏压, 要提高低 负载率下的功放效率, 通常需要将功放的漏压和栅压一起调整。
但是,在对现有技术的研究和实践过程中,发明人发现现有技术上述调整 功放的偏置电压的方法,仍然不能有效地改善发射机效率,发射机性能仍会受 到其它因素的影响。
发明内容
本发明实施例提供一种改善发射机效率的方法和发射机,能够有效地改善 发射机效率。
本发明实施例所提供的改善发射机效率的方法和发射机实施例是通过以 下技术方案实现的:
本发明实施例提供了一种改善发射机功放效率的方法,该方法将输入的数 字信号转换为模拟信号并通过发射通道输出到功放, 并且还包括:
统计输入的数字信号的平均功率;
根据统计得到的所述平均功率,按照根据不同的平均功率等级所设置的削 波门限对所述输入的数字信号进行削波处理;
根据统计得到的所述平均功率,按照根据不同的平均功率等级所设置的偏 置电压参考值对所述功放的偏置电压进行调整。
本发明实施例还提供了一种发射机, 该发射机包括数字模拟转换器、用于 将输入的数字信号转换为模拟信号并通过发射通道输出到功放, 并且还包括: 第一功率统计器, 用于统计所述输入的数字信号的平均功率;
削波处理器, 用于根据第一功率统计器所输出的平均功率,按照根据不同 的平均功率等级所设置的削波门限对所述输入的数字信号进行削波处理后输 出到所述数字模拟转换器;
电压控制器, 用于根据所述第一功率统计器统计得到的平均功率,按照根 据不同的平均功率等级所设置的偏置电压参考值对功放的偏置电压进行调整。
从以上技术方案可以看出,通过统计输入的数字信号的平均功率, 并根据 统计得到的平均功率按照根据不同的功率等级所设置的偏置电压参考值对功 放的偏置电压进行调整, 以降低功放的功耗, 节省设备功耗; 并根据统计得到 的平均功率按照根据不同的功率等级所设置的削波门限对输入的数字信号进 行削波处理, 对信号进行削波后, 可以降低对发射机内功放线性度的要求, 使 得功放可以减少回退, 因此可以有效地改善发射机效率。
附图说明
图 1为本发明实施例中发射机实施例一的框图;
图 2为本发明实施例中改善发射机效率的方法实施例一流程图; 图 3为本发明实施例中发射机实施例三的框图;
图 4为图 3所示的发射机的发射通道的框图;
图 5为图 3所示的发射机的反馈通道的框图;
图 6为图 3所示的发射机的闭环调整增益原理框图。
具体实施方式
本发明实施例提供了一种改善发射机效率的方法和发射机,能够有效地改 善发射机效率。
为使本发明实施例的目的、 技术方案及优点更加清楚、 明了, 以下参照附 图, 通过具体实施例进行详细描述: 参照图 1 , 为本发明实施例中发射机实施例一的框图, 数字域基带 I/Q信 号经过削波处理器 11后,由数字模拟转换器( DAC ) 12转换成模拟信号, DAC 12输出的模拟信号经由发射通道 13输入功放(PA ) 14, PA 14输出的信号经 过天线 15发射出去。
为了降低功耗, 改善发射机效率, 实施例一的发射机还包括:
第一功率统计器 16, 用于统计所输入数字信号 (数字域基带同相 /正交 ( I/Q )信号) 的平均功率;
削波处理器 11 , 用于根据第一功率统计器 16所输出的平均功率, 按照根 据不同的平均功率等级所设置的削波门限对输入的数字信号进行削波处理后 输出到 DAC 13;
电压控制器 17, 用于根据第一功率统计器 16统计得到的平均功率, 按照 根据不同的平均功率等级所设置的偏置电压参考值对 PA 14 的偏置电压进行 调整。
其中,偏置电压包括功放的栅压和漏压。 所设置的不同的功率等级对应不 同的削波门限和功放偏置电压参考值。
以下通过具体实施例说明采用上述发射机改善发射机效率的方法,参照图 2, 为本发明实施例中改善发射机效率的方法实施例一流程图, 以下通过具体 步骤进行详细说明:
S101、 统计输入的数字信号的平均功率;
S102、根据统计得到的所述平均功率,按照根据不同的平均功率等级所设 置的削波门限对所述输入的数字信号进行削波处理;
S103、根据统计得到的所述平均功率,按照根据不同的平均功率等级所设 置的偏置电压参考值对所述功放的偏置电压进行调整。
可以看出, 该发射机通过统计输入的基带信号的平均功率, 并由削波处理 器根据统计得到的平均功率按照设置的平均功率等级所对应的削波门限进行 削波处理,由电压控制器根据统计得到的平均功率按照设置的平均功率等级所 对应的偏置电压参考值进行调整, 其中, 通过对功放的偏置电压进行调整, 可 以降低功放的功耗, 进而降低发射机功耗, 而对输入的数字信号进行削波处理 则可以降低对发射机内功放线性度的要求,使得功放可以减少回退,综上可知, 该实施例可以有效地改善发射机效率。
为了进一步改善发射机效率, 可以对输入的数字信号的增益进行调整, 以 下通过具体实施例说明:
发射机实施例二、通过开环的方式来补偿功放调压时增益的波动, 即控制 电压针对不同输出功率等级预设补偿量,这种方案可以通过生产时装备做表的 方式实现。 假定功放增益是不变的, 得到不同功率等级下的偏置电压值, 而实 际在生产调测过程中, 功放在调压的时候增益不是稳定的, 可以通过在原偏置 电压基础上进行调整,一旦增益达到稳定值,就把当时的电压偏移量记录下来, 按照表格等形式写入基站的存储器件中 (掉电信息不丢失)。 在设备运行过程 中, 电压控制器 17在进行调压控制时, 还用于根据预先存储的对应的偏置电 压偏移量,更新发射机实施例一中按照不同的平均功率等级所设置的偏置电压 参考值, 并根据更新后的偏置电压参考值对 PA14的偏置电压进行调整。 根据 预先存储的对应的偏置电压偏移量,更新发射机实施例一中按照不同的平均功 率等级所设置的偏置电压参考值, 具体为: 将预先存储的电压增益偏移量和按 照不同的平均功率等级所设置的偏置电压参考值相加,更新所述按照不同的平 均功率等级所设置的偏置电压参考值。
发射机实施例三、 采用闭环方式来调整增益, 参照图 3, 为本发明实施例 中发射机实施例三的框图:
数字域基带 I/Q信号通过削波处理器 31、 第二功率统计器 32后经过数字 模拟转换器( DAC ) 33转换成模拟信号, DAC 33输出的模拟信号经由发射通 道 34送入功放(PA ) 35, 功放输出信号通过耦合器 36耦合后送入反馈通道 37, 反馈的射频信号通过反馈通道 37后变成模拟中频或者模拟基带信号后, 通过模拟数字转换器(ADC ) 38转换成数字信号后输入第二功率统计器 32, 形成发射和反馈通道的闭合环路。
上述第二功率统计器 32, 用于统计削波处理后的数字信号 (数字域基带
I/Q信号)的功率以及反馈通道 37返回的信号的功率,得到输入的数字信号的 实际增益, 并根据设置的目标增益及输入的数字信号的实际增益,调整发射通 道对输入信号的增益。
参照图 4, 为图 3中所示的发射通道的框图, 发射通道 34可以包括调制 器或上变频器 341 , 其中:
如果发射机采用零中频方式, 发射通道包括调制器, 由调制器将 DAC 33 输出的模拟基带 I/Q信号调制到载频上, 通过天线 39发送出去。
如果发射机采用数字中频方式, 发射通道 34可以包括上变频器, 上变频 器也可以称为混频器,将 DAC 33输出的模拟中频信号和本振信号混频后上变 频到载频上。
由于调制器或上变频器 341输出的信号功率较小, 因此, 可以在后面级联 几级放大器后再发送给功放。 参照图 4中的放大器 342。
为了调整增益, 可以采用模拟、数控衰减器或者可变增益放大器等增益调 节器 343。
参照图 5, 为图 3中所示的反馈通道的框图, 对应于发射通道 34, 反馈通 道 37可以包括下变频器或者模拟解调器 371 , 用于将功放耦合的射频信号下 变频为模拟中频信号或者通过模拟解调器变换成模拟基带 I/Q信号,所述下变 频器的作用与上变频器的作用相反, 模拟解调器的作用与调制器的作用相反。 模拟信号经过滤波后通过 ADC进行模拟到数字信号的转换。
另外, 反馈通道也可以包含放大器 372。 器 344和滤波器 373。 图 4和图 5中用虚线表示的器件表示是可选的。
参照图 6, 为图 3所示的闭环调整增益原理框图, 以下筒要说明其原理: 设削波处理器 31的输出功率为 PDin,整个发射通道及 PA35的增益为 GF, 设功放输出的信号功率为 Pout, PDin+GF=Pout; 设反馈通道总增益为 GR, 第 二功率统计器 32统计反馈通道反馈信号的数字功率为 PR, 则 PR-GR=Pout。 其中, GR和 GF都可以通过生产设备进行校正, 是一个固定值。 设功放输出 功率为 47.2dBm, 对应功放输出 47.2dBm的数字域功率为 PDin, 如果通道增 益不变化, 则 PDin+GF, 可以保证输出功率为 47.2dBm, PR-GR对应功放输 出的实际功率。 调压时通常功放增益会发生变化, 因此 PDin+GF与 PR-GR通 常是不相等的。 此时第二功率统计器 32 可以统计出增益变化值: PDin+GF- ( PR-GR ), 并调整发射通道上的衰减器或者可变增益放大器等增益调节器, 这种实现方式可以在模拟通道上实现。 可以理解的是, 也可以在数字域调整增益来进一步改善发射机效率, 这时 只需要由第二功率统计器 32统计削波处理后的所述数字信号的功率以及反馈 通道返回的信号的功率,得到所述输入的数字信号的实际增益; 并根据设置的 目标增益及所述输入的数字信号的实际增益,对所述输入数字信号的数字功率 进行调整, 以调整对所述输入的数字信号的增益。 在数字域调整增益时, 发射 通道上不需要具有衰减器或者可变增益放大器等增益调节的电路或器件。
以下通过具体流程说明采用上述发射机改善发射机效率的方法:
为了进一步改善发射机效率,在方法实施例一的基础上还可以对输入信号 的增益进行调整:
统计削波处理后的数字信号的功率以及反馈通道返回的信号的功率,得到 输入的数字信号的实际增益;
可以根据设置的目标增益及输入的数字信号的实际增益,对输入数字信号 的数字功率进行调整, 以调整对输入的数字信号的增益。
也可以根据设置的目标增益及所述输入的数字信号的实际增益,调整发射 通道对输入信号的增益。根据设置的目标增益及所述输入的数字信号的实际增 益调整发射通道对输入信号的增益, 具体为: 根据设置的目标增益及输入的数 字信号的实际增益,控制发射通道上的衰减器或者可变增益放大器以调整发射 通道对输入信号的增益。
当然, 除上述方法以外, 也可以只统计输入数字信号的平均功率, 按照不 同的平均功率等级所设置的偏置电压参考值及预先存储的对应的偏置电压偏 移量, 对功放的偏置电压进行调整, 以调整功放对输入信号的增益。
以上通过具体应用来说明了改善发射机效率的方法, 可以理解的是, 本发 明 实施例所述方 法及发射机适用 于 UMTS ( Universal Mobile Telecommunications System, 通用移动通信系统)、 CDMA2000 ( Code Division Multiple Access 2000 , 宽带码分多址接入 2000 )、 LTE ( Long Time Evolution , 长期演进网络)、 Wimax ( Worldwide Interoperability for Microwave Access, 微 波存取全球互通)等不同制式的基站或终端设备。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤 是可以通过程序来指令相关的硬件完成,所述的程序可以存储于一种计算机可 读存储介质中, 该程序在执行时, 包括如下步骤:
统计输入的数字信号的平均功率;
根据统计得到的所述平均功率,按照根据不同的平均功率等级所设置的削 波门限对所述输入的数字信号进行削波处理;
根据统计得到的所述平均功率,按照根据不同的平均功率等级所设置的偏 置电压参考值对所述功放的偏置电压进行调整。
上述提到的存储介质可以是只读存储器, 磁盘或光盘等。
以上对本发明所提供的一种改善发射机效率的方法和设备进行了详细介 绍, 对于本领域的一般技术人员, 依据本发明实施例的思想, 在具体实施方式 及应用范围上均会有改变之处, 综上所述, 本说明书内容不应理解为对本发明 的限制。

Claims

权 利 要 求
1、 一种改善发射机效率的方法, 包括将输入的数字信号转换为模拟信号 并通过发射通道输出到功放, 其特征在于, 还包括:
统计输入的数字信号的平均功率;
根据统计得到的所述平均功率,按照根据不同的平均功率等级所设置的削 波门限对所述输入的数字信号进行削波处理;
根据统计得到的所述平均功率,按照根据不同的平均功率等级所设置的偏 置电压参考值对所述功放的偏置电压进行调整。
2、 如权利要求 1所述的改善发射机效率的方法, 其特征在于, 进一步包 括:
根据设置的目标增益及所述输入的数字信号的实际增益对所述输入的数 字信号的增益进行调整。
3、 如权利要求 2所述的改善发射机效率的方法, 其特征在于, 所述根据 设置的目标增益及所述输入的数字信号的实际增益对所述输入的数字信号的 增益进行调整, 具体包括:
统计削波处理后的所述数字信号的功率以及反馈通道返回的信号的功率, 得到所述输入的数字信号的实际增益;
根据设置的目标增益及所述输入的数字信号的实际增益,对所述输入数字 信号的数字功率进行调整, 以调整所述输入的数字信号的增益。
4、 如权利要求 2所述的改善发射机效率的方法, 其特征在于, 所述根据 设置的目标增益及所述输入的数字信号的实际增益对所述输入的数字信号的 增益进行调整, 具体包括:
统计削波处理后的所述数字信号的功率以及反馈通道返回的信号的功率, 得到所述输入的数字信号的实际增益;
根据设置的目标增益及所述输入的数字信号的实际增益,调整发射通道对 输入信号的增益。
5、 如权利要求 4所述的改善发射机效率的方法, 其特征在于, 所述根据 设置的目标增益及所述输入的数字信号的实际增益,调整发射通道对输入信号 的增益, 具体包括: 根据设置的目标增益及所述输入的数字信号的实际增益,控制发射通道上 的增益调节器以调整发射通道对输入信号的增益。
6、 如权利要求 1所述的改善发射机效率的方法, 其特征在于, 还包括: 根据所述根据不同的平均功率等级所设置的偏置电压参考值及预先存储 的对应的偏置电压偏移量,对功放的偏置电压进行调整, 以调整功放对输入信 号的增益。
7、 一种发射机, 包括数字模拟转换器、 用于将输入的数字信号转换为模 拟信号并通过发射通道输出到功放, 其特征在于, 还包括:
第一功率统计器, 用于统计所述输入的数字信号的平均功率;
削波处理器, 用于根据第一功率统计器所输出的平均功率,按照根据不同 的平均功率等级所设置的削波门限对所述输入的数字信号进行削波处理后输 出到所述数字模拟转换器;
电压控制器, 用于根据所述第一功率统计器统计得到的平均功率,按照根 据不同的平均功率等级所设置的偏置电压参考值对功放的偏置电压进行调整。
8、 如权利要求 7所述的发射机, 其特征在于, 还包括:
第二功率统计器,用于统计削波处理后的所述数字信号的功率以及反馈通 道返回的信号的功率,得到所述输入的数字信号的实际增益, 并根据设置的目 标增益及所述输入的数字信号的实际增益, 调整发射通道对输入信号的增益。
9、 如权利要求 8所述的发射机, 其特征在于, 所述发射通道包括增益调 节器, 用于在第二功率统计器的控制下调整发射通道对输入信号的增益。
10、如权利要求 7所述的发射机,其特征在于,还包括: 第三功率统计器, 用于统计削波处理后的所述数字信号的功率以及反馈通道返回的信号的功率, 得到所述输入的数字信号的实际增益,并根据设置的目标增益及所述输入的数 字信号的实际增益,对所述输入数字信号的数字功率进行调整, 以调整对所述 输入的数字信号的增益。
11、 如权利要求 7所述的发射机, 其特征在于, 所述电压控制器还用于根 据预先存储的对应的偏置电压偏移量,更新所述按照不同的平均功率等级所设 置的偏置电压参考值,并根据更新后的偏置电压参考值对功放的偏置电压进行 调整。
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