JP2003209477A5

JP2003209477A5 -

Info

Publication number: JP2003209477A5
Application number: JP2002007249A
Authority: JP
Filing date: 2002-01-16
Publication date: 2004-12-09

Description

【発明の名称】自動利得制御装置、無線通信装置、移動局、基地局及び自動利得制御方法Title: Automatic gain control device , wireless communication device, mobile station, base station, and automatic gain control method

【０００１】
【発明の属する技術分野】
本発明は、移動体通信システムにおける携帯電話機等の移動局やこの移動局と無線通信を行う基地局に用いて好適な自動利得制御装置及び自動利得制御方法に関する。さらには、この自動利得制御装置を具備する無線通信装置、移動局及び基地局に関する。 [0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an automatic gain control device and an automatic gain control method suitable for use in a mobile station such as a mobile phone in a mobile communication system and a base station that performs wireless communication with the mobile station. Further, the present invention relates to a wireless communication device, a mobile station, and a base station including the automatic gain control device.

【０００５】
【課題を解決するための手段】
請求項１に係る発明の自動利得制御装置は、設定された利得で受信信号を増幅する可変利得増幅手段と、通信開始時に自局の現在位置を取得する現在位置取得手段と、取得された前記自局の現在位置に基づいて通信相手局との間の通信距離を算出し、算出された前記通信距離に基づいて通信開始時における受信信号の受信レベルを予測する予測手段と、予測された前記受信信号の受信レベルに基づいて、前記利得の初期値を設定する初期値設定手段と、を具備する構成を採る。[0005]
[Means for Solving the Problems]
The automatic gain control device according to the first aspect of the present invention includes a variable gain amplifying unit that amplifies a received signal with a set gain, a current position obtaining unit that obtains a current position of the own station at the start of communication, Predicting means for calculating a communication distance with a communication partner station based on the current position of the own station, and for predicting a reception level of a received signal at the time of starting communication based on the calculated communication distance, An initial value setting means for setting an initial value of the gain based on a reception level of a reception signal .

【０００７】
請求項２に係る発明の自動利得制御装置は、前記発明において、前記通信相手局の位置情報を記録する記録手段を具備し、前記予測手段は、取得された前記自局の現在位置及び記録された前記通信相手局の位置情報に基づいて、前記通信相手局との間の前記通信距離を算出する、構成を採る。 [0007]
The automatic gain control device according to the invention according to claim 2, further comprising a recording unit for recording position information of the communication partner station in the invention, wherein the prediction unit acquires the current position of the own station and the recorded current position of the own station. The communication distance with the communication partner station is calculated based on the position information of the communication partner station.

【０００８】
この構成によれば、前記発明による効果に加えて、記録手段が通信相手局の位置情報を記録しているため、自動利得制御装置は通信開始時における受信信号の受信レベルを自立的に予測することができる。[0008]
According to this configuration , in addition to the effect of the present invention, since the recording unit records the position information of the communication partner station, the automatic gain control device independently predicts the reception level of the reception signal at the start of communication. it is possible.

【０００９】
請求項３に係る発明の自動利得制御装置は、前記発明において、前記可変利得増幅手段により前記利得で増幅された前記受信信号の電力レベルを検出する検出手段と、検出された前記電力レベルに基づいて、通信開始後における前記可変利得増幅手段の前記利得の設定を制御する制御手段と、を具備する構成を採る。[0009]
4. The automatic gain control device according to claim 3 , wherein, based on the detected power level, the detection unit detects a power level of the reception signal amplified by the variable gain amplification unit by the variable gain amplification unit. And control means for controlling the setting of the gain of the variable gain amplifying means after the start of communication .

【００１０】
この構成によれば、前記発明による効果に加えて、増幅後の受信信号の電力レベルに応じて制御手段が可変利得増幅手段で用いられる利得をフィードバック調節するため、自動利得制御装置は通信開始後も受信信号の電力レベルを好適範囲内で維持することができる。[0010]
According to this configuration, in addition to the effect of the present invention, the control means feedback-controls the gain used in the variable gain amplifying means according to the power level of the amplified received signal. Also, the power level of the received signal can be maintained within a suitable range .

【００１１】
請求項４に係る発明の無線通信装置は、前記発明に係る自動利得制御装置を具備する構成を採る。[0011]
A wireless communication device according to a fourth aspect of the invention employs a configuration including the automatic gain control device according to the invention .

【００１３】
請求項５に係る発明の移動局は、前記発明に係る自動利得制御装置を具備する構成を採る。[0013]
A mobile station according to a fifth aspect of the invention employs a configuration including the automatic gain control device according to the invention .

【００１５】
請求項６に係る発明の基地局は、前記発明に係る自動利得制御装置を具備する構成を採る。[0015]
A base station according to a sixth aspect of the invention employs a configuration including the automatic gain control device according to the invention .

【００１７】
請求項７に係る発明の自動利得制御方法は、設定された利得で受信信号を増幅する可変利得増幅ステップと、通信開始時に自局の現在位置を取得する現在位置取得ステップと、取得された前記自局の現在位置に基づいて通信相手局との間の通信距離を算出する通信距離算出ステップと、算出された前記通信距離に基づいて通信開始時における受信信号の受信レベルを予測する予測ステップと、予測された前記受信信号の受信レベルに基づいて、前記利得の初期値を設定する初期値設定ステップと、を具備するようにした。 [0017]
The automatic gain control method according to the invention according to claim 7, further comprising: a variable gain amplification step of amplifying a received signal with a set gain ; a current position acquisition step of acquiring a current position of the own station at the start of communication; A communication distance calculation step of calculating a communication distance between the communication partner station based on the current position of the own station, and a prediction step of predicting a reception level of a reception signal at the start of communication based on the calculated communication distance. And setting an initial value of the gain based on the predicted reception level of the received signal.

【００１８】
この方法によれば、上記同様に通信開始時から安定した受信信号レベルが得られる。[0018]
By this method lever, the similarly stable reception signal level from the start of communication can be obtained.

【００２２】
この図において、本実施の形態の自動利得制御装置は、可変利得増幅器１０１と、自動利得制御回路１００とを備えている。自動利得制御回路１００は、電力検出回路１０２と、利得制御回路１０３と、初期値設定回路１０４と、受信電力予測回路１０５とを備えている。電力検出回路１０２は、受信信号の電力レベルを検出して利得制御回路１０３に入力する。利得制御回路１０３は、電力検出回路１０２で検出された受信信号の電力値を用いて受信信号を所望の電力レベルになるように可変利得増幅器１０１の利得を制御する制御信号を出力する。可変利得増幅器１０１は、自動利得制御回路１００の利得制御回路１０３からの制御信号に基づいて利得の設定を行う。[0022]
In this figure, the automatic gain control device of the present embodiment includes a variable gain amplifier 101 and an automatic gain control circuit 100. The automatic gain control circuit 100 includes a power detection circuit 102, a gain control circuit 103, an initial value setting circuit 104, and a received power prediction circuit 105. The power detection circuit 102 detects the power level of the received signal and inputs it to the gain control circuit 103. The gain control circuit 103 outputs a control signal for controlling the gain of the variable gain amplifier 101 so that the received signal has a desired power level using the power value of the received signal detected by the power detection circuit 102. The variable gain amplifier 101 sets the gain based on a control signal from the gain control circuit 103 of the automatic gain control circuit 100.

【００２３】
図２は受信電力予測回路１０５の構成を示すブロック図である。受信電力予測回路１０５は、通信距離算出回路２０６と距離・利得変換回路２０７とを備えている。通信距離算出回路２０６には通信開始時に現在位置情報と通信相手局の位置情報が入力される。現在位置情報は、現在位置取得手段としての図示せぬＧＰＳ(Global Positioning System)システムより得られる。また、通信相手局の位置情報は図示せぬ記録部に予め記録されており、この記録部から提供されることにより得られる。通信距離算出回路２０６は、現在位置と既知の通信相手局の位置情報から通信距離を算出し、その結果を距離・利得変換回路２０７に入力する。[0023]
FIG. 2 is a block diagram showing a configuration of the received power prediction circuit 105. The reception power prediction circuit 105 includes a communication distance calculation circuit 206 and a distance / gain conversion circuit 207. The current position information and the position information of the communication partner station are input to the communication distance calculation circuit 206 at the start of communication. The current position information is obtained from a GPS (Global Positioning System) system (not shown) as current position acquisition means . The position information of the communication partner station is recorded in advance in a recording unit (not shown), and is obtained by being provided from this recording unit. The communication distance calculation circuit 206 calculates the communication distance from the current position and the position information of the known communication partner station, and inputs the result to the distance / gain conversion circuit 207.

【００２４】
距離・利得変換回路２０７は、通信距離算出回路２０６からの通信距離情報を用いて所望の受信信号レベルを得る可変利得増幅器１０１の利得を予測し、その予測結果を初期値設定回路１０４に入力する。初期値設定回路１０４は、受信電力予測回路１０５から入力されてくる予測結果に基づいて、利得制御回路１０３に可変利得増幅器１０１で通信開始時に用いられる利得の初期値を出力する。利得制御回路１０３は、初期値設定回路１０４からの初期値を用いて可変利得増幅器１０１の制御を開始する。この動作により所望の受信信号レベルを得られる可変利得増幅器１０１の利得が予測され初期値として設定される。所望の受信信号レベルを得られる可変利得増幅器１０１の利得に近い初期値を設定することにより、受信信号レベルを短時間に所望の受信信号レベルに収束させることが可能となる。[0024]
Distance and gain processing circuit 207 uses the communication distance information from the communication distance calculating circuit 206 to predict the gain of the variable gain amplifier 101 to obtain the desired received signal level, the input prediction results of it to the initial value setting circuit 104 I do. The initial value setting circuit 104 outputs an initial value of a gain used by the variable gain amplifier 101 at the start of communication to the gain control circuit 103 based on the prediction result input from the received power prediction circuit 105 . The gain control circuit 103 starts controlling the variable gain amplifier 101 using the initial value from the initial value setting circuit 104. With this operation, the gain of the variable gain amplifier 101 that can obtain a desired reception signal level is predicted and set as an initial value. By setting an initial value close to the gain of the variable gain amplifier 101 that can obtain a desired reception signal level, it is possible to converge the reception signal level to the desired reception signal level in a short time.

【００３０】
（実施の形態３）
次に、本発明の実施の形態３に係る移動体端末を説明する。但し、上述した実施の形態１と実施の形態２と同様の動作については省略する。なお、ここでは現在位置情報を取得する現在位置取得手段の一例としてＧＰＳシステムを用い、移動局と基地局との間の通信を例に挙げる。[0030]
(Embodiment 3)
Next, a mobile terminal according to Embodiment 3 of the present invention will be described. However, the same operations as those in the first and second embodiments are omitted. Here, a GPS system is used as an example of a current position acquisition unit for acquiring current position information, and communication between a mobile station and a base station is taken as an example.

Claims

Variable gain amplifying means for amplifying the received signal with the set gain,
Current position acquisition means for acquiring the current position of the own station at the start of communication,
Predicting means for calculating a communication distance with a communication partner station based on the obtained current position of the own station, and predicting a reception level of a reception signal at the time of starting communication based on the calculated communication distance,
An automatic gain control device comprising: an initial value setting unit that sets an initial value of the gain based on the predicted reception level of the reception signal .

Recording means for recording position information of the communication partner station,
The said prediction means calculates the said communication distance with the said communication partner station based on the acquired current position of the said own station and the recorded position information of the said communication partner station, The said communication means characterized by the above-mentioned. Item 2. The automatic gain control device according to Item 1.

Detecting means for detecting the power level of the received signal amplified by the gain by the variable gain amplifying means,
2. The automatic gain control device according to claim 1, further comprising control means for controlling the setting of the gain of the variable gain amplifying means after the start of communication based on the detected power level.

A wireless communication device comprising the automatic gain control device according to claim 1.

A mobile station comprising the automatic gain control device according to claim 1.

A base station comprising the automatic gain control device according to claim 1.

A variable gain amplification step of amplifying the received signal with the set gain,
A current position acquisition step of acquiring the current position of the own station at the start of communication,
A communication distance calculating step of calculating a communication distance with a communication partner station based on the obtained current position of the own station;
A prediction step of predicting a reception level of a reception signal at the start of communication based on the calculated communication distance,
An initial value setting step of setting an initial value of the gain based on the predicted reception level of the received signal.