JP2006135617A - Receiver and automatic gain control method - Google Patents

Receiver and automatic gain control method Download PDF

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JP2006135617A
JP2006135617A JP2004321875A JP2004321875A JP2006135617A JP 2006135617 A JP2006135617 A JP 2006135617A JP 2004321875 A JP2004321875 A JP 2004321875A JP 2004321875 A JP2004321875 A JP 2004321875A JP 2006135617 A JP2006135617 A JP 2006135617A
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target value
agc target
amplitude
gain
transmission system
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Takashi Iwai
敬 岩井
Daisuke Yamada
大輔 山田
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Priority to PCT/JP2005/020307 priority patent/WO2006049253A1/en
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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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/18—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging
    • H03M1/181—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging in feedback mode, i.e. by determining the range to be selected from one or more previous digital output values
    • H03M1/183—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging in feedback mode, i.e. by determining the range to be selected from one or more previous digital output values the feedback signal controlling the gain of an amplifier or attenuator preceding the analogue/digital converter

Abstract

<P>PROBLEM TO BE SOLVED: To perform automatic gain control while suppressing the impact of waveform distortion and quantization error due to clipping at the time of A/D conversion through simple arrangement regardless of the reception signal transmission system. <P>SOLUTION: A transmission system information setting section 106 extracts transmission system information from the transmission system information and ID number in a transmission system information field. An AGC target value determining section 107 calculates optimal AGC target values for the transmission system of various patterns by transmission experiment through an actual machine or computer simulation and holds them previously in an internal memory. From transmission system information outputted from the transmission system information setting section 106, the AGC target value determining section 107 selects a corresponding optimal AGC target value. A gain determining section 108 compares an amplitude outputted from an amplitude measuring section 103 with an AGC target value outputted from the AGC target value determining section 107 and determines the gain of a variable gain amplifying section 101 to become the AGC target value. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、ＣＤＭＡ（Code Division Multiple Access）通信に使用される受信装置及び自動利得制御方法に関するものである。   The present invention relates to a receiving apparatus and an automatic gain control method used for CDMA (Code Division Multiple Access) communication.

従来の受信装置及び自動利得制御方法として、非特許文献１に開示されたものがある。図３は、従来の受信装置の構成を示すブロック図である。図３において、受信装置１０は、可変利得増幅部１１と、Ａ／Ｄ変換部１２と、平均振幅測定部１３と、ＡＧＣ目標値決定部１４と、利得決定部１５と、復調部１６とから主に構成されている。   A conventional receiving apparatus and automatic gain control method are disclosed in Non-Patent Document 1. FIG. 3 is a block diagram showing a configuration of a conventional receiving apparatus. In FIG. 3, the receiving apparatus 10 includes a variable gain amplification unit 11, an A / D conversion unit 12, an average amplitude measurement unit 13, an AGC target value determination unit 14, a gain determination unit 15, and a demodulation unit 16. It is mainly composed.

可変利得増幅部１１は、利得決定部１５で決定された利得で受信信号の振幅を増幅し、増幅後の受信信号をＡ／Ｄ変換部１２に出力する。   The variable gain amplifier 11 amplifies the amplitude of the received signal with the gain determined by the gain determiner 15 and outputs the amplified received signal to the A / D converter 12.

Ａ／Ｄ変換部１２は、可変利得増幅部１１から出力された受信信号をアナログ／ディジタル変換し、ディジタル変換されたディジタル信号を平均振幅測定部１３と復調部１６に出力する。   The A / D conversion unit 12 performs analog / digital conversion on the reception signal output from the variable gain amplification unit 11 and outputs the digitally converted digital signal to the average amplitude measurement unit 13 and the demodulation unit 16.

平均振幅測定部１３は、Ａ／Ｄ変換部１２から出力されたＡ／Ｄ変換後の受信信号のある所定期間内の振幅の平均を算出する。   The average amplitude measurement unit 13 calculates the average of the amplitudes within a predetermined period of the received signal after A / D conversion output from the A / D conversion unit 12.

ＡＧＣ目標値決定部１４は、Ａ／Ｄ変換部１２から出力されたＡ／Ｄ変換後の受信信号平均振幅の目標値となるＡＧＣ目標値を決定する。   The AGC target value determination unit 14 determines an AGC target value that is a target value of the received signal average amplitude after A / D conversion output from the A / D conversion unit 12.

利得決定部１５は、平均振幅測定部１３から出力される平均振幅とＡＧＣ目標値決定部１４から出力されるＡＧＣ目標値とを比較し、可変利得増幅部１１の利得を決定し、決定した利得情報を可変利得増幅部１１に出力する。利得の決定方法としては、例えば、平均振幅をＡＭＰaveとＡＧＣ目標値をＡＧＣtargetとした時、利得Ｇ＝ＡＭＰtarget／ＡＭＰaveとする方法がある。   The gain determination unit 15 compares the average amplitude output from the average amplitude measurement unit 13 with the AGC target value output from the AGC target value determination unit 14, determines the gain of the variable gain amplification unit 11, and determines the determined gain. Information is output to the variable gain amplifier 11. As a method for determining the gain, for example, when the average amplitude is AMPave and the AGC target value is AGCtarget, there is a method of gain G = AMPtarget / AMPave.

このように、従来の受信装置及び自動利得制御方法では、Ａ／Ｄ変換後の受信信号の平均振幅が、予め設定したＡＧＣ目標値になるように利得制御を行うことで、Ａ／Ｄ変換部１２に入力される受信信号の振幅レベルを適切なレベルに調整している。
１９９５年電子情報通信学会通信ソサイエテイ大会Ｂ−１９５「オーバーサンプリングＡＧＣの特性」 Thus, in the conventional receiving apparatus and automatic gain control method, the A / D conversion unit is configured to perform gain control so that the average amplitude of the received signal after A / D conversion becomes a preset AGC target value. The amplitude level of the received signal input to 12 is adjusted to an appropriate level.
1995 IEICE Communication Society Conference B-195 “Characteristics of Oversampling AGC”

ＣＤＭＡ通信においては、受信信号の伝送形式（例えば、多重チャネル数、各チャネルの電力比、各チャネルのディジタル通信方式）によってＰＡＲ（Peak to Average power Ratio：ピーク対平均電力比）が異なり、最適なＡＧＣ目標値が伝送形式によって異なるという特徴がある。しかしながら、従来の受信装置においては、ＡＧＣ目標値が固定であったため、Ａ／Ｄ変換部１２のダイナミックレンジを越える振幅レベルの大きな受信信号がＡ／Ｄ変換部１２に入力された場合には、クリップ処理による波形歪みが生じ、また振幅レベルが小さい受信信号がＡ／Ｄ変換部１２に入力された場合には、量子化誤差の影響により、受信特性の劣化を招くという問題がある。   In CDMA communication, the PAR (Peak to Average power Ratio) differs depending on the transmission format of received signals (for example, the number of multiplexed channels, the power ratio of each channel, and the digital communication system of each channel), and is optimal. The AGC target value is different depending on the transmission format. However, in the conventional receiver, since the AGC target value is fixed, when a received signal having a large amplitude level exceeding the dynamic range of the A / D converter 12 is input to the A / D converter 12, When a waveform distortion due to clip processing occurs and a received signal with a small amplitude level is input to the A / D converter 12, there is a problem that reception characteristics are deteriorated due to the influence of quantization errors.

図４及び図５を用いてこの課題を説明する。図４及び図５は、Ａ／Ｄ変換部のビット数を同一とした場合の計算機シミュレーションの結果で、横軸はＥｃ／Ｎｏ［ｄＢ］（周波数帯域内におけるチップ当たりの受信電力（Ｅｃ）対雑音電力密度（Ｎｏ）比）で、縦軸は受信信号のＢＥＲ（Bit Error Rate）を示している。   This problem will be described with reference to FIGS. 4 and 5 show the results of computer simulation when the number of bits of the A / D conversion unit is the same, and the horizontal axis indicates Ec / No [dB] (reception power (Ec) per chip in the frequency band). Noise power density (No) ratio), and the vertical axis represents the BER (Bit Error Rate) of the received signal.

図４は、コード多重数が多くＰＡＲが大きい場合のＢＥＲ特性のシミュレーション結果で、Ａ／Ｄ変換部のダイナミックレンジの４０％、２５％をＡＧＣ目標値とした場合と、ピーク値がクリップされないように利得制御した場合の例である。図４の結果から、この伝送条件では、ＡＧＣ目標値はＡ／Ｄ変換部のダイナミックレンジの４０％と設定した場合やピーク値がクリップされないように利得制御する場合よりも、２５％に設定した場合の方がＢＥＲ特性が良いことがわかる。   FIG. 4 is a simulation result of the BER characteristic when the number of multiplexed codes is large and the PAR is large. When the AGC target value is 40% and 25% of the dynamic range of the A / D converter, the peak value is not clipped. This is an example when gain control is performed. From the result of FIG. 4, in this transmission condition, the AGC target value is set to 25%, compared to the case where the A / D conversion unit is set to 40% of the dynamic range or the peak value is not clipped. It can be seen that the case has better BER characteristics.

図５は、コード多重数が少なくＰＡＲが小さい場合のシミュレーション結果で、Ａ／Ｄ変換部のダイナミックレンジの４０％及び２５％をＡＧＣ目標値に設定した場合のＢＥＲ特性である。図５の結果から、この伝送条件では、ＡＧＣ目標値はＡ／Ｄ変換部のダイナミックレンジの２５％と設定した場合よりも、４０％に設定した場合の方がＢＥＲ特性が良いことがわかる。   FIG. 5 is a simulation result when the number of multiplexed codes is small and the PAR is small, and shows the BER characteristics when 40% and 25% of the dynamic range of the A / D conversion unit is set as the AGC target value. From the result of FIG. 5, it can be seen that under this transmission condition, the BER characteristic is better when the AGC target value is set to 40% than when the AGC target value is set to 25% of the dynamic range of the A / D converter.

図４及び図５のシミュレーション結果より、ＰＡＲの値によって、つまり伝送形式により、最適なＡＧＣ目標値が異なること、また、図４からは、ピーク値がクリップされないように利得制御する方法では、Ａ／Ｄ変換部のビット数が足りない場合には、受信特性が劣化することがわかる。なお、図４及び図５における計算機シミュレーションにおいて、ＡＧＣ目標値をＡ／Ｄ変換部のダイナミックレンジの４０％および２５％の場合の例を示したが、必ずしもこれらの値が最適値であるわけではなく、ＰＡＲの値によって、ＡＧＣ目標値の最適値が異なることを示すために例示したものである。   From the simulation results in FIG. 4 and FIG. 5, the optimum AGC target value differs depending on the PAR value, that is, the transmission format, and from FIG. 4, in the method of gain control so that the peak value is not clipped, A It can be seen that when the number of bits in the / D conversion unit is insufficient, the reception characteristics deteriorate. In the computer simulations in FIGS. 4 and 5, an example in which the AGC target value is 40% and 25% of the dynamic range of the A / D conversion unit is shown, but these values are not necessarily optimum values. Rather, it is illustrated to show that the optimum value of the AGC target value differs depending on the value of PAR.

本発明は、かかる点に鑑みてなされたものであり、伝送形式に応じてＡＧＣ目標値を制御することにより、簡易な構成で、受信信号の伝送形式によらず、Ａ／Ｄ変換時のクリップ処理による波形歪みおよび量子化誤差の影響を低減した自動利得制御を行うことができる受信装置と自動利得制御方法を提供することを目的とする。   The present invention has been made in view of the above points, and by controlling the AGC target value according to the transmission format, the clip at the time of A / D conversion can be achieved with a simple configuration regardless of the transmission format of the received signal. It is an object of the present invention to provide a receiving apparatus and an automatic gain control method capable of performing automatic gain control with reduced effects of waveform distortion and quantization error due to processing.

かかる課題を解決するため本発明の受信装置は、受信信号の振幅レベルを制御する可変利得増幅手段と、伝送形式に対応したＡＧＣ目標値を保持し、伝送形式に応じてＡＧＣ目標値を選択するＡＧＣ目標値決定手段と、受信信号の振幅を測定する振幅測定手段と、前記振幅測定手段から出力される受信信号の振幅値を前記ＡＧＣ目標値となるように前記可変利得増幅手段の利得を決定する利得決定手段と、を備えた構成を採る。   In order to solve this problem, the receiving apparatus of the present invention holds variable gain amplifying means for controlling the amplitude level of a received signal, an AGC target value corresponding to the transmission format, and selects the AGC target value according to the transmission format. AGC target value determining means, amplitude measuring means for measuring the amplitude of the received signal, and determining the gain of the variable gain amplifying means so that the amplitude value of the received signal output from the amplitude measuring means becomes the AGC target value. And a gain determining means.

本発明の自動利得制御方法は、受信信号の振幅レベルを制御する可変利得増幅工程と、伝送形式に対応したＡＧＣ目標値を保持し、伝送形式に応じてＡＧＣ目標値を選択するＡＧＣ目標値決定工程と、受信信号の振幅を測定する振幅測定工程と、前記振幅測定工程から出力される受信信号の振幅値を前記ＡＧＣ目標値となるように前記可変利得増幅工程の利得を決定する利得決定工程と、を備えた方法を採る。   The automatic gain control method of the present invention includes a variable gain amplification step for controlling the amplitude level of a received signal, an AGC target value corresponding to a transmission format, and an AGC target value determination for selecting an AGC target value according to the transmission format. A gain measuring step of determining the gain of the variable gain amplifying step so that the amplitude value of the received signal output from the amplitude measuring step becomes the AGC target value And a method comprising:

本発明によれば、伝送形式に応じてＡＧＣ目標値を制御することにより、簡易な構成で、受信信号の伝送形式によらず、Ａ／Ｄ変換時のクリップ処理による波形歪みおよび量子化誤差の影響を低減した自動利得制御を行うことができる。   According to the present invention, by controlling the AGC target value in accordance with the transmission format, waveform distortion and quantization error due to clip processing during A / D conversion can be achieved with a simple configuration regardless of the transmission format of the received signal. Automatic gain control with reduced influence can be performed.

以下、本発明の実施の形態について図面を参照して詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１は、本発明の一実施の形態に係る受信装置の構成を示すブロック図である。図１において、受信装置１００は、可変利得増幅部１０１と、Ａ／Ｄ変換部１０２と、振幅測定部１０３と、復調部１０４と、伝送形式情報検出部１０５と、伝送形式情報設定部１０６と、ＡＧＣ目標値決定部１０７と、利得決定部１０８とから主に構成されている。   FIG. 1 is a block diagram showing a configuration of a receiving apparatus according to an embodiment of the present invention. In FIG. 1, a receiving apparatus 100 includes a variable gain amplification unit 101, an A / D conversion unit 102, an amplitude measurement unit 103, a demodulation unit 104, a transmission format information detection unit 105, and a transmission format information setting unit 106. The AGC target value determining unit 107 and the gain determining unit 108 are mainly configured.

可変利得増幅部１０１は、利得決定部１０８で決定された利得で受信信号の振幅を増幅し、増幅後の受信信号をＡ／Ｄ変換部１０２に出力する。   Variable gain amplifying section 101 amplifies the amplitude of the received signal with the gain determined by gain determining section 108 and outputs the amplified received signal to A / D conversion section 102.

Ａ／Ｄ変換部１０２は、可変利得増幅部１０１から出力された受信信号をアナログ／ディジタル変換し、変換したディジタル信号を振幅測定部１０３及び復調部１０４に出力する。   The A / D conversion unit 102 performs analog / digital conversion on the reception signal output from the variable gain amplification unit 101, and outputs the converted digital signal to the amplitude measurement unit 103 and the demodulation unit 104.

振幅測定部１０３は、Ａ／Ｄ変換部１０２から出力されたディジタル信号の振幅を測定し、利得決定部１０８に出力する。この時、ある所定時間内の平均振幅を測定し、平均振幅を利得決定部１０８に出力してもよい。   The amplitude measurement unit 103 measures the amplitude of the digital signal output from the A / D conversion unit 102 and outputs it to the gain determination unit 108. At this time, an average amplitude within a predetermined time may be measured and the average amplitude may be output to the gain determination unit 108.

復調部１０４は、Ａ／Ｄ変換部１０２から出力されたディジタル信号を復調し、データ信号と制御信号を復号する。   The demodulator 104 demodulates the digital signal output from the A / D converter 102 and decodes the data signal and the control signal.

伝送形式情報検出部１０５は、復調部１０４から出力された制御信号に含まれる伝送形式情報を通知するための伝送形式情報フィールドを検出する。伝送形式情報としては、例えば、受信信号の多重チャネル数、各チャネルの電力比、ディジタル変調方法（１６ＱＡＭ、ＱＰＳＫ等）等がある。伝送形式情報フィールドのビット数の制限を受けても、様々なパターンの伝送形式を表示することができるように伝送形式情報をＩＤ番号に変換し、伝送形式情報フィールド中に含める場合もある。例えば、Ｗ−ＣＤＭＡの場合であれば、制御信号ＤＰＣＣＨ（Dedicated Physical Control Channel）フォーマット中のＴＦＣＩ（Transport Format Combination Indicator）フィールドが伝送形式情報フィールドに相当し、伝送形式に対応した番号を値として持っている。   The transmission format information detection unit 105 detects a transmission format information field for notifying transmission format information included in the control signal output from the demodulation unit 104. The transmission format information includes, for example, the number of multiplexed channels of received signals, the power ratio of each channel, a digital modulation method (16QAM, QPSK, etc.) and the like. Even if the number of bits of the transmission format information field is limited, the transmission format information may be converted into an ID number and included in the transmission format information field so that various patterns of transmission formats can be displayed. For example, in the case of W-CDMA, the TFCI (Transport Format Combination Indicator) field in the control signal DPCCH (Dedicated Physical Control Channel) format corresponds to the transmission format information field, and has a number corresponding to the transmission format as a value. ing.

伝送形式情報設定部１０６は、伝送形式情報フィールド中の伝送形式情報やＩＤ番号から、伝送形式情報を抽出し、伝送形式情報をＡＧＣ目標値決定部１０７に出力する。   The transmission format information setting unit 106 extracts the transmission format information from the transmission format information and the ID number in the transmission format information field, and outputs the transmission format information to the AGC target value determination unit 107.

ＡＧＣ目標値決定部１０７は、実機による伝送実験や、計算機シミュレーションにより、様々なパターンの伝送形式に対する最適なＡＧＣ目標値をあらかじめ算出し、内部のメモリにテーブルとして保持している。図２は、内部メモリに保持されるテーブルの一例で、伝送形式と各伝送形式に対する最適なＡＧＣ目標値を構成要素として持つ。図２において、例えば、伝送形式ＩＤ番号３は、チャネル数が３で、また、チャネル１に対するチャネル２の電力比が−５［ｄＢ］、チャネル１に対するチャネル３の電力比が−１０［ｄＢ］、変調方式はチャネル１、チャネル２、チャネル３ともにＱＰＳＫ変調の場合の伝送形式を表し、この伝送形式に対する最適なＡＧＣ目標値（図２の例では、２５％）を構成要素として持っている。   The AGC target value determination unit 107 calculates in advance an optimal AGC target value for various types of transmission formats through a transmission experiment using a real machine or a computer simulation, and stores the AGC target value as a table in an internal memory. FIG. 2 is an example of a table held in the internal memory, and has a transmission format and an optimal AGC target value for each transmission format as components. In FIG. 2, for example, the transmission format ID number 3 has 3 channels, the power ratio of channel 2 to channel 1 is −5 [dB], and the power ratio of channel 3 to channel 1 is −10 [dB]. The modulation method represents a transmission format in the case of QPSK modulation for all of channel 1, channel 2, and channel 3, and has an optimum AGC target value (25% in the example of FIG. 2) for this transmission format as a component.

ＡＧＣ目標値決定部１０７は、伝送形式情報設定部１０６から出力される伝送形式情報から、内部メモリを参照し、伝送形式に対応するＡＧＣ目標値を選択し、選択したＡＧＣ目標値を利得決定部１０８に出力する。なお、実機による伝送実験や、計算機シミュレーションにより、様々なパターンの伝送形式に対する最適なＡＧＣ目標値をあらかじめ算出し、内部のメモリに保持することにより、受信装置１００において、ＰＡＲを実際に測定する必要がなくＰＡＲ測定手段を省くことが可能となる。   The AGC target value determination unit 107 refers to the internal memory from the transmission format information output from the transmission format information setting unit 106, selects an AGC target value corresponding to the transmission format, and uses the selected AGC target value as a gain determination unit. It outputs to 108. In addition, it is necessary to actually measure the PAR in the receiving apparatus 100 by calculating in advance an optimal AGC target value for various types of transmission formats through a transmission experiment using a real machine or a computer simulation, and holding the value in an internal memory. Therefore, the PAR measuring means can be omitted.

利得決定部１０８は、振幅測定部１０３から出力される振幅とＡＧＣ目標値決定部１０７から出力されるＡＧＣ目標値とを比較し、ＡＧＣ目標値になるように可変利得増幅部１０１の利得を決定し、決定した利得情報を可変利得増幅部１０１に出力する。利得の決定方法としては、例えば、振幅測定部１０３から出力された振幅をＡＭＰ、ＡＧＣ目標値をＡＭＰtargetとすると、利得Ｇ＝ＡＭＰtarget／ＡＭＰとする方法がある。利得の決定方法としては、通常の自動利得制御方法で用いられる他の手法を用いてもよい。   The gain determination unit 108 compares the amplitude output from the amplitude measurement unit 103 with the AGC target value output from the AGC target value determination unit 107, and determines the gain of the variable gain amplification unit 101 so as to be the AGC target value. The determined gain information is output to the variable gain amplifying unit 101. As a method for determining the gain, for example, there is a method of gain G = AMPtarget / AMP, where the amplitude output from the amplitude measuring unit 103 is AMP and the AGC target value is AMPtarget. As a method for determining the gain, another method used in a normal automatic gain control method may be used.

このように本実施の形態によれば、伝送形式に応じてＡＧＣ目標値を制御することにより、簡易な構成で、受信信号の伝送形式によらず、Ａ／Ｄ変換時のクリップ処理による波形歪みおよび量子化誤差の影響を低減した自動利得制御を行うことができる。   As described above, according to the present embodiment, by controlling the AGC target value in accordance with the transmission format, waveform distortion due to clip processing during A / D conversion can be achieved with a simple configuration regardless of the transmission format of the received signal. In addition, automatic gain control with reduced influence of quantization error can be performed.

本発明は、ＣＤＭＡ通信における受信装置に用いるのに最適である。   The present invention is most suitable for use in a receiving apparatus in CDMA communication.

本発明の一実施の形態に係る受信装置の構成を示すブロック図The block diagram which shows the structure of the receiver which concerns on one embodiment of this invention 本発明における各伝送形式に対応した最適なＡＧＣ目標値のテーブルの一例を示す図The figure which shows an example of the table of the optimal AGC target value corresponding to each transmission format in this invention 従来の受信装置の構成を示すブロック図Block diagram showing the configuration of a conventional receiving apparatus ＡＧＣ目標値とＢＥＲ特性との関係を示す図The figure which shows the relationship between AGC target value and BER characteristic ＡＧＣ目標値とＢＥＲ特性との関係を示す図The figure which shows the relationship between AGC target value and BER characteristic

符号の説明Explanation of symbols

１００ 受信装置
１０１ 可変利得増幅部
１０２ Ａ／Ｄ変換部
１０３ 振幅測定部
１０４ 復調部
１０５ 伝送形式情報検出部
１０６ 伝送形式情報設定部
１０７ ＡＧＣ目標値決定部
１０８ 利得決定部 DESCRIPTION OF SYMBOLS 100 Receiver 101 Variable gain amplification part 102 A / D conversion part 103 Amplitude measurement part 104 Demodulation part 105 Transmission format information detection part 106 Transmission format information setting part 107 AGC target value determination part 108 Gain determination part

Claims (4)

受信信号の振幅レベルを制御する可変利得増幅手段と、伝送形式に対応したＡＧＣ目標値を保持し、前記受信信号の伝送形式に応じてＡＧＣ目標値を選択するＡＧＣ目標値決定手段と、前記受信信号の振幅を測定する振幅測定手段と、前記振幅測定手段で測定された振幅値が前記ＡＧＣ目標値となるように前記可変利得増幅手段の利得を決定する利得決定手段と、を具備することを特徴とする受信装置。   Variable gain amplifying means for controlling the amplitude level of the received signal; AGC target value determining means for holding an AGC target value corresponding to a transmission format; and selecting an AGC target value according to the transmission format of the received signal; Amplitude measuring means for measuring the amplitude of the signal, and gain determining means for determining the gain of the variable gain amplifying means so that the amplitude value measured by the amplitude measuring means becomes the AGC target value. A receiving device. 請求項１記載の受信装置を具備することを特徴とする通信端末装置。   A communication terminal device comprising the receiving device according to claim 1. 請求項１記載の受信装置を具備することを特徴とする基地局装置。   A base station apparatus comprising the receiving apparatus according to claim 1. 受信信号の振幅レベルを制御する可変利得増幅工程と、伝送形式に対応したＡＧＣ目標値を保持し、前記受信信号の伝送形式に応じてＡＧＣ目標値を選択するＡＧＣ目標値決定工程と、受信信号の振幅を測定する振幅測定工程と、前記振幅測定工程で測定された振幅値が前記ＡＧＣ目標値となるように前記可変利得増幅工程の利得を決定する利得決定工程と、を具備することを特徴とする自動利得制御方法。   A variable gain amplification step for controlling the amplitude level of the received signal; an AGC target value determining step for holding an AGC target value corresponding to the transmission format; and selecting an AGC target value according to the transmission format of the received signal; An amplitude measurement step for measuring the amplitude of the variable gain amplification step, and a gain determination step for determining the gain of the variable gain amplification step so that the amplitude value measured in the amplitude measurement step becomes the AGC target value. And automatic gain control method.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1892830A1 (en) 2006-08-23 2008-02-27 Fujitsu Ltd. Radio signal receiver and gain control method thereof
WO2008044307A1 (en) * 2006-10-13 2008-04-17 Panasonic Corporation Radio signal receiving device

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* Cited by examiner, † Cited by third party
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JP3406494B2 (en) * 1997-11-04 2003-05-12 シャープ株式会社 Transmitting apparatus and receiving apparatus in multi-rate delay multiplexing direct spread spectrum communication system and multi-rate delay multiplexing direct spread spectrum communication system
JP2001036351A (en) * 1999-07-16 2001-02-09 Matsushita Electric Ind Co Ltd Power amplifier

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1892830A1 (en) 2006-08-23 2008-02-27 Fujitsu Ltd. Radio signal receiver and gain control method thereof
US7805121B2 (en) 2006-08-23 2010-09-28 Fujitsu Limited Radio signal receiver and gain control method thereof
WO2008044307A1 (en) * 2006-10-13 2008-04-17 Panasonic Corporation Radio signal receiving device

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