JPH09284205A - Reception sir measurement device and transmission power controller - Google Patents
Reception sir measurement device and transmission power controllerInfo
- Publication number
- JPH09284205A JPH09284205A JP8091579A JP9157996A JPH09284205A JP H09284205 A JPH09284205 A JP H09284205A JP 8091579 A JP8091579 A JP 8091579A JP 9157996 A JP9157996 A JP 9157996A JP H09284205 A JPH09284205 A JP H09284205A
- Authority
- JP
- Japan
- Prior art keywords
- transmission power
- power
- signal
- power control
- sir
- Prior art date
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はディジタル無線通
信、特にＣＤＭＡ（符号分割多元接続）方式を適用する
移動通信に関するものであり、特に受信ＳＩＲ（希望信
号対干渉信号電力比）を測定に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to digital radio communication, and more particularly to mobile communication to which a CDMA (code division multiple access) system is applied, and more particularly to measurement of received SIR (desired signal to interference signal power ratio). is there.
【０００２】[0002]
【従来の技術】ＣＤＭＡ方式においては、同一の周波数
帯域を複数の通信者が共有するために、他の通信者の信
号が干渉信号となり自分のチャネルの通信品質を劣化さ
せている。基地局の近くの移動局と遠くの移動局が同時
に通信を行う場合、基地局においては、近くの移動局か
らの送信信号は高電力で受信され、遠くの移動局からの
送信信号は低電力で受信される。したがって、遠くの移
動局と基地局との通信は、近くの移動局からの干渉を受
けて回線品質が大きく劣化する問題点、即ち、遠近問題
が生じる。2. Description of the Related Art In the CDMA system, since a plurality of communication parties share the same frequency band, the signals of other communication parties become interference signals and deteriorate the communication quality of their own channel. When a mobile station near the base station and a mobile station far from the base station communicate at the same time, the base station receives the transmission signal from the near mobile station with high power and the transmission signal from the far mobile station with low power. Will be received at. Therefore, in communication between a distant mobile station and a base station, there is a problem that the line quality is greatly deteriorated due to interference from a nearby mobile station, that is, a near-far problem.
【０００３】遠近問題を解決する技術として、従来から
送信電力制御の検討が行われてきた。送信電力制御と
は、受信局が受信する受信電力、またはその受信電力か
ら求められる希望波対干渉波電力比（ＳＩＲ：Ｓｉｇｎ
ａｌ−ｔｏ−Ｉｎｔｅｒｆｅｒｅｎｃｅ ｐｌｕｓ Ｎ
ｏｉｓｅ ｐｏｗｅｒ Ｒａｔｉｏ）が移動局の所在位
置によらず一定になるように送信電力を制御するもので
ある。これにより、サービスエリア内で均一の回線品質
が得られる。特に上りチャネルに対しては、基地局受信
端において各移動局からの送信信号の受信電力、または
受信ＳＩＲが一定となるように、各移動局の送信電力制
御を行う。Transmission power control has been studied as a technique for solving the near-far problem. The transmission power control is the reception power received by the receiving station, or the desired wave-to-interference wave power ratio (SIR: Sign) obtained from the reception power.
al-to-Interference plus N
The transmission power is controlled so that the noise power ratio becomes constant regardless of the location of the mobile station. As a result, uniform line quality can be obtained within the service area. Especially for the uplink channel, the transmission power of each mobile station is controlled so that the reception power of the transmission signal from each mobile station or the reception SIR becomes constant at the base station receiving end.
【０００４】他の通信者からの干渉信号を白色化雑音と
みなすＣＤＭＡ方式では、他の通信者が多い場合には等
価的に雑音電力が増えた場合に相当し、この場合、同一
セル内の加入者容量は所要回線品質を得ることができる
受信ＳＩＲによる。一方、下りチャネルに関しては、自
チャネルの信号も他の通信者の干渉となる信号も同一の
伝搬路を通るため、自チャネルの信号と長区間変動、短
区間変動、瞬時変動等が同一の変動をし、雑音電力を除
く受信ＳＩＲが常に一定である。従って、同一セルの干
渉のみを扱う場合には送信電力制御は必要ない。しか
し、干渉白色化のＣＤＭＡでは、隣接セルについても同
一の周波数帯域を用いて通信を行うために、他セルから
の干渉も考慮しなければならない。他セルからの干渉電
力は、セル内の干渉電力と等しくレイレー・フェージン
グによる瞬時変動となるが、自局希望波信号とは同一の
変動とはならない。In the CDMA system in which an interference signal from another communication party is regarded as whitening noise, when there are many other communication parties, the noise power is equivalently increased, and in this case, in the same cell. The subscriber capacity depends on the reception SIR that can obtain the required line quality. On the other hand, regarding the downlink channel, since the signal of the own channel and the signal that interferes with other correspondents pass through the same propagation path, the long-term fluctuation, short-term fluctuation, and instantaneous fluctuation are the same as those of the own-channel signal. The received SIR excluding noise power is always constant. Therefore, transmission power control is not necessary when only interference of the same cell is handled. However, in interference whitening CDMA, interference from other cells must be taken into consideration in order to perform communication using the same frequency band for adjacent cells. The interference power from other cells is equal to the interference power in the cell and is an instantaneous fluctuation due to Rayleigh fading, but it is not the same fluctuation as the own station desired wave signal.
【０００５】米国ＴＩＡで標準化されたＣＤＭＡシステ
ムでは、下り送信電力制御は基本的には行わず、フレー
ム誤り率を検出し、所定のしきい値よりも大きくなると
その移動局に対する送信電力を上げる方法を採用してい
る。大幅に送信電力を制御すると他セルへの干渉の増大
につながるためである。しかしながら、自分のチャネル
に対して他セルの基地局からの送信信号は瞬時変動する
干渉信号となり、前記従来技術では、他セルからの瞬時
変動に追従することはできなかった。In the CDMA system standardized by the US TIA, the downlink transmission power control is basically not performed, but a method of detecting the frame error rate and increasing the transmission power to the mobile station when the frame error rate becomes larger than a predetermined threshold value. Has been adopted. This is because if the transmission power is controlled significantly, interference with other cells will increase. However, the transmission signal from the base station of another cell with respect to its own channel becomes an interference signal that fluctuates instantaneously, and the above-mentioned conventional technique cannot follow the instantaneous fluctuation from another cell.
【０００６】瞬時変動に追従する送信電力制御方式とし
て、送信電力制御ビットを用いたクローズドループによ
る送信電力制御方式がある。この制御方式は、基地局と
基地局のセル内にいる移動局が通信する場合に、移動局
は、基地局からの希望波の受信ＳＩＲを測定し、測定結
果に基づき基地局の送信電力を制御するための送信電力
制御ビットを決定する。次に、移動局は、送信信号の中
に送信電力制御ビットを挿入し、基地局に対して送信す
る。基地局は、移動局から送信された信号を受信し、送
信電力制御ビットを抽出し、送信電力制御ビットの指示
に従い送信電力を決定する。また、基地局は、移動局か
らの希望波の受信ＳＩＲを測定し、測定結果に基づき移
動局の送信電力を制御するための送信電力制御ビットを
決定する。基地局は、送信信号の中に送信電力制御ビッ
トを挿入し、移動局に対して送信する。移動局は、基地
局から送信された信号を受信し、送信電力制御ビットを
抽出し、送信電力制御ビットの指示に従い送信電力を決
定する。このようにして、移動局と基地局とでクローズ
ドループを構成して、移動局の送信電力を制御してい
る。この送信電力制御ビットを用いるクローズドループ
による送信電力制御では、高精度のＳＩＲ測定技術が要
求される。As a transmission power control system that follows the instantaneous fluctuation, there is a closed loop transmission power control system using a transmission power control bit. In this control method, when a base station and a mobile station in the cell of the base station communicate with each other, the mobile station measures the reception SIR of the desired wave from the base station and determines the transmission power of the base station based on the measurement result. Determine the transmit power control bits to control. Next, the mobile station inserts a transmission power control bit in the transmission signal and transmits it to the base station. The base station receives the signal transmitted from the mobile station, extracts the transmission power control bit, and determines the transmission power according to the instruction of the transmission power control bit. Also, the base station measures the reception SIR of the desired wave from the mobile station and determines the transmission power control bit for controlling the transmission power of the mobile station based on the measurement result. The base station inserts a transmission power control bit in the transmission signal and transmits it to the mobile station. The mobile station receives the signal transmitted from the base station, extracts the transmission power control bit, and determines the transmission power according to the instruction of the transmission power control bit. In this way, the mobile station and the base station form a closed loop to control the transmission power of the mobile station. Closed loop transmission power control using this transmission power control bit requires a highly accurate SIR measurement technique.
【０００７】図６は、従来のＳＩＲ測定装置の一例であ
る。受信信号１は、逆拡散される前に、ＩＦ帯の包絡線
検波器２においてエンベロープ検波され、全受信電力３
が求められる。一方、受信信号１はベースバンドの逆拡
散器４において逆拡散され、相関検出が行われる。希望
波受信電力検出回路５において、相関出力の同相成分、
直交成分は、二乗和され希望波受信電力６が求められ
る。干渉電力８は、干渉電力検出回路７において、包絡
線検波器２において求められた全受信電力３から希望波
受信電力６を減算されることにより求められる。ＳＩＲ
検出回路９において、希望波受信電力６を干渉電力８で
除することにより、受信ＳＩＲ１０は求められる。FIG. 6 shows an example of a conventional SIR measuring device. The received signal 1 is envelope-detected by the IF band envelope detector 2 before being despread, and the total received power 3
Is required. On the other hand, the received signal 1 is despread in the baseband despreader 4 and correlation detection is performed. In the desired wave reception power detection circuit 5, the in-phase component of the correlation output,
The quadrature components are sum of squares to obtain the desired wave reception power 6. The interference power 8 is obtained in the interference power detection circuit 7 by subtracting the desired wave reception power 6 from the total reception power 3 obtained in the envelope detector 2. SIR
In the detection circuit 9, the reception SIR 10 is obtained by dividing the desired wave reception power 6 by the interference power 8.
【０００８】[0008]
【発明が解決しようとする課題】このような従来の受信
ＳＩＲ測定装置においては、受信ＳＩＲが小さいときに
干渉電力測定の精度が劣化する。その結果、高精度の送
信電力制御ができないという問題点があった。また、Ｉ
Ｆ帯における全受信電力を求める演算とベースバンドに
おける演算のタイミング調整が必要となり、装置の構成
が複雑になるという問題点もあった。In such a conventional receiving SIR measuring apparatus, the accuracy of interference power measurement deteriorates when the receiving SIR is small. As a result, there is a problem in that highly accurate transmission power control cannot be performed. Also, I
There is also a problem that the timing of the calculation for calculating the total received power in the F band and the calculation in the base band are required, which complicates the configuration of the device.
【０００９】このような問題点を解決するために、本発
明では、受信ＳＩＲ測定精度の向上でき、構成の簡単な
測定装置を提供することを目的としている。In order to solve such a problem, an object of the present invention is to provide a measuring device which can improve the reception SIR measurement accuracy and has a simple structure.
【００１０】また、その測定装置を用いて、送信電力の
制御を行うことも本発明の目的である。It is also an object of the present invention to control the transmission power by using the measuring device.
【００１１】[0011]
【課題を解決するための手段】上記目的のため、本発明
は、既知であるパイロット信号が所定の間隔で情報信号
に挿入されている信号を用いている移動無線の受信ＳＩ
Ｒ測定装置において、パイロット信号を用いて内挿補間
同期検波する同期検波手段と、内挿補間により判定され
た情報データ・シンボルの電力値を計算する手段と、情
報データ・シンボルの電力値を所定のパイロット信号間
隔間で積算値を求める手段と、判定された情報データ・
シンボルと同一サンプリング・タイムにおけるフェージ
ング・エンベロープとの電力値の差を計算する手段と、
電力値の差を所定のパイロット信号間隔間で積算値を求
める手段と、情報データ・シンボルの電力値の積算値
と、電力差の積算値との比を計算する手段とを備え、計
算結果の比を受信希望信号対干渉信号電力比（ＳＩＲ）
として用いることを特徴とする移動無線の受信ＳＩＲ測
定装置である。For the above object, the present invention provides a mobile radio reception SI using a signal in which a known pilot signal is inserted into an information signal at predetermined intervals.
In the R measuring device, a synchronous detection means for performing interpolative interpolation synchronous detection using a pilot signal, a means for calculating the power value of the information data symbol determined by the interpolation, and a predetermined power value of the information data symbol Means for obtaining the integrated value between the pilot signal intervals of the
Means for calculating the difference in power value between the symbol and the fading envelope at the same sampling time,
Means for obtaining an integrated value of the difference in power values between predetermined pilot signal intervals, and means for calculating the ratio of the integrated value of the power values of the information data / symbol and the integrated value of the power difference are provided. Receive ratio of desired signal to interference signal power ratio (SIR)
A mobile radio reception SIR measuring apparatus characterized by being used as.
【００１２】このような構成とすることにより、構成の
簡単なＳＩＲ測定装置を得ることができ、しかも、その
測定精度は十分なものが得られる。With such a structure, it is possible to obtain an SIR measuring device having a simple structure, and moreover, sufficient measurement accuracy can be obtained.
【００１３】また、前記ＳＩＲ測定装置を用いて、受信
ＳＩＲ測定装置から得られたＳＩＲと、予め定められて
いるＳＩＲの目標値とを比較する手段と、比較結果に基
づき対向局に対して送信電力制御情報を発する手段と、
対向局から送信された送信電力情報を受信して復調する
手段と、復調された送信電力制御情報に従い、自局の送
信電力を制御する手段を具備する送信電力制御装置を構
成することができる。ＳＩＲ測定装置が簡単な構成で十
分な測定精度が得られるために、このＳＩＲを用いた送
信電力制御装置の構成も簡単になる。Further, using the SIR measuring device, means for comparing the SIR obtained from the receiving SIR measuring device with a predetermined SIR target value, and transmitting to the opposite station based on the comparison result. Means for issuing power control information,
It is possible to configure a transmission power control device that includes means for receiving and demodulating the transmission power information transmitted from the opposite station and means for controlling the transmission power of the local station according to the demodulated transmission power control information. Since the SIR measurement device can obtain sufficient measurement accuracy with a simple configuration, the configuration of the transmission power control device using this SIR is also simplified.
【００１４】その上、送信電力制御装置において、パイ
ロット信号間におけるフェージング・エンベロープの電
力値の変化量を計算する手段と、フェージング・エンベ
ロープの電力値の変化量と、予め定められている許容変
化量とを比較する手段と、フェージング・エンベロープ
の変化量が許容値を超える場合には、送信電力制御を止
める手段とを具備することにより、省電力を図ることも
できる。In addition, in the transmission power control device, means for calculating the amount of change in the power value of the fading envelope between pilot signals, the amount of change in the power value of the fading envelope, and the predetermined allowable amount of change It is also possible to achieve power saving by providing a means for comparing and a means for stopping the transmission power control when the amount of change in the fading envelope exceeds the allowable value.
【００１５】[0015]
【発明の実施の形態】図面を参照して、本発明の実施形
態を説明する。Embodiments of the present invention will be described with reference to the drawings.
【００１６】図１に、本発明の実施形態で使用している
内挿補間同期検波に用いている信号の構成例を示す。図
に示すように、送信信号に送信側、受信側で互いに既知
の位相のパイロット信号を周期的に挿入して送信してい
る。パイロット信号として、１〜複数の既知のシンボル
を用いる。パイロット間の情報シンボル期間をフレーム
という。FIG. 1 shows an example of the configuration of a signal used for the interpolation interpolation synchronous detection used in the embodiment of the present invention. As shown in the figure, pilot signals of mutually known phases are periodically inserted into the transmission signal on the transmitting side and the receiving side and transmitted. As the pilot signal, one to a plurality of known symbols are used. The information symbol period between pilots is called a frame.
【００１７】図２は、本発明の実施形態の受信ＳＩＲ測
定装置の構成例である。図において、２２は内挿補間同
期検波部、２４は判定信号電力計算部、２６は積算部で
ある。また、２１は同期部、２５は疑似干渉電力検出
部、２７は積算部である。２８はＳＩＲ測定部である。FIG. 2 shows an example of the configuration of the reception SIR measuring apparatus according to the embodiment of the present invention. In the figure, reference numeral 22 is an interpolated synchronous detection unit, 24 is a determination signal power calculation unit, and 26 is an integration unit. Further, 21 is a synchronizing unit, 25 is a pseudo interference power detecting unit, and 27 is an integrating unit. 28 is a SIR measurement part.
【００１８】この回路構成において、受信したベースバ
ンドの受信信号２０は、同期部２１に入力し、シンボル
のクロック・タイミングとパイロット信号の繰り返し周
期であるフレーム・タイミングを再生する。この同期部
２１で再生したタイミングにより、他の回路の動作タイ
ミングが定まる。受信信号２０は、内挿補間同期検波部
２２において、同期部２１からのクロック・タイミング
でサンプリングされ、内挿補間同期検波部２２内の図示
しないメモリに蓄えられる。また、受信信号のパイロッ
ト信号は、フレーム・タイミングにより受信信号から抽
出され、伝搬路の伝達関数の推定に用いられる。この操
作をフレーム・タイミングで繰り返すことにより、その
時刻での伝達関数を推定することができる。情報シンボ
ル期間の両端にあるパイロットにより得られた伝達関数
を一次内挿補間し、各情報シンボルに対応する伝達関数
を求め、情報シンボルの補償を行う。補償された情報シ
ンボルを判定することにより絶対位相同期検波された情
報シンボル２３が得られる。In this circuit configuration, the received baseband received signal 20 is input to the synchronizing section 21 to reproduce the clock timing of the symbol and the frame timing which is the repetition period of the pilot signal. The operation timing of other circuits is determined by the timing reproduced by the synchronizing unit 21. The received signal 20 is sampled by the interpolation interpolation synchronous detection unit 22 at the clock timing from the synchronization unit 21, and is stored in a memory (not shown) in the interpolation interpolation synchronous detection unit 22. Further, the pilot signal of the received signal is extracted from the received signal at the frame timing and used for estimating the transfer function of the propagation path. By repeating this operation at the frame timing, the transfer function at that time can be estimated. The transfer function obtained by the pilots at both ends of the information symbol period is linearly interpolated to obtain the transfer function corresponding to each information symbol, and the information symbol is compensated. By determining the compensated information symbol, the information symbol 23 detected by the absolute phase synchronization is obtained.
【００１９】次に、判定信号電力計算部２４において、
複素信号空間上で、判定された情報シンボル２３の原点
からの距離の二乗、すなわち希望波電力値を求める。一
方、疑似干渉電力計算部２５において、複素信号空間上
で、判定された情報シンボル２３と受信信号２０の距離
の二乗を求める。これは、データシンボルと同一のサン
プリング・タイムにおけるフェージング・エンベロープ
との電力値の差を求めていることになる。この求めた値
を疑似干渉電力として用いる。Next, in the decision signal power calculator 24,
In the complex signal space, the square of the distance of the determined information symbol 23 from the origin, that is, the desired wave power value is obtained. On the other hand, the pseudo interference power calculator 25 obtains the square of the distance between the determined information symbol 23 and the received signal 20 in the complex signal space. This means that the difference in power value between the data symbol and the fading envelope at the same sampling time is obtained. The calculated value is used as the pseudo interference power.
【００２０】希望波受信電力および疑似干渉波電力をそ
れぞれ１フレーム分内で、積算部２６および２７を用い
て積算することにより平均する。ＳＩＲ測定部２８にお
いて、平均した希望波受信電力積算値を平均した疑似干
渉電力積算値で除することにより受信ＳＩＲ２９が求め
られる。The received power of the desired wave and the power of the pseudo interference wave are averaged within one frame by accumulating using the accumulators 26 and 27. In the SIR measuring section 28, the reception SIR 29 is obtained by dividing the averaged desired wave reception power integrated value by the averaged pseudo interference power integrated value.
【００２１】本発明によると、ベースバンド受信信号だ
けから受信ＳＩＲを求めているため装置構成が単純化で
きる。また、後で説明するように、このように、複素信
号空間上で判定された情報シンボルと受信信号の距離の
二乗を疑似干渉電力を計算して受信ＳＩＲに用いても、
高精度の送信電力制御の実現が可能である。According to the present invention, since the received SIR is obtained only from the baseband received signal, the device structure can be simplified. Further, as will be described later, even if the square of the distance between the information symbol determined in the complex signal space and the received signal is used for the received SIR by calculating the pseudo interference power,
It is possible to realize highly accurate transmission power control.
【００２２】図３は、上記の受信ＳＩＲ測定装置を用い
て送信電力制御を行う送信側の装置の一実施形態であ
る。図３において、３０はアンテナ、３１は送受分離
部、３２は受信無線部、３３は逆拡散部、２１は同期検
出部、２２は内挿補間同期検波部、２４は判定信号電力
計算部、２５は疑似干渉電力計算部、２６および２７は
積算部、２８はＳＩＲ測定部、４１は送信電力制御ビッ
ト決定部、４２は信号発生部、４３は符号化部、４４は
変調部、４５は拡散部、４６は送信無線部、４７はビタ
ビ復号部、４８は送信電力制御ビット抽出部、４９は送
信電力制御部を示している。なお、図２とおなじ構成に
は、同じ符号を付した。FIG. 3 shows an embodiment of a device on the transmission side for controlling the transmission power using the above-mentioned reception SIR measuring device. In FIG. 3, reference numeral 30 is an antenna, 31 is a transmission / reception separation unit, 32 is a reception radio unit, 33 is a despreading unit, 21 is a synchronization detection unit, 22 is an interpolation interpolation synchronous detection unit, 24 is a determination signal power calculation unit, 25 Is a pseudo interference power calculation unit, 26 and 27 are integration units, 28 is an SIR measurement unit, 41 is a transmission power control bit determination unit, 42 is a signal generation unit, 43 is an encoding unit, 44 is a modulation unit, and 45 is a spreading unit. , 46 is a transmission wireless unit, 47 is a Viterbi decoding unit, 48 is a transmission power control bit extraction unit, and 49 is a transmission power control unit. The same components as those in FIG. 2 are designated by the same reference numerals.
【００２３】この構成において、この送信装置を移動局
に用いた場合の動作について説明する。In this configuration, the operation when this transmitting apparatus is used for a mobile station will be described.
【００２４】基地局から送信されたスペクトル拡散信号
はアンテナ３０で受信される。受信信号は送受分離部３
１を経由し、受信無線部３２に入力される。受信無線部
３２において、受信信号は帯域通過フィルタ（ＢＰＦ）
を通過し、帯域外成分を除去した後、増幅器で増加され
た後、局部発振器発生のクロックにより中間周波数帯
（ＩＦ帯）に周波数変換される。ＩＦ帯に周波数変換さ
れた受信信号はＢＰＦ通過後、自動利得制御回路（ＡＧ
Ｃ）により適正な信号レベルに補正された後、準同期検
波されベースバンドに周波数変換される。ベースバンド
に周波数変換された受信信号は低域通過フィルタ（ＬＰ
Ｆ）通過後、アナログ−ディジタル変換（Ａ／Ｄ変換）
されディジタル信号となり出力される。受信無線部３２
から出力された受信ディジタル信号は、逆拡散部３３に
おいて拡散を取り除かれ、狭帯域の変調信号として出力
される。逆拡散部３３から出力された信号は、内挿補間
同期検波部２２において復調される。その復調された信
号のうち、情報信号はビタビ復号部において復号され、
出力される。また、送信電力制御ビットは、送信電力制
御ビット抽出部４８において抽出され、送信電力制御部
４９へ出力される。送信電力制御部４９において、送信
電力制御ビットに基づき送信電力を決定し、制御情報を
送信無線部４６に出力する。一方、逆拡散部３３におい
て逆拡散された受信信号から、上記で、図２を用いて説
明したように受信ＳＩＲが求められる。The spread spectrum signal transmitted from the base station is received by the antenna 30. The reception signal is the transmission / reception separation unit 3
It is input to the reception wireless unit 32 via 1. In the reception radio unit 32, the reception signal is a band pass filter (BPF).
After removing the out-of-band component, the signal is increased by an amplifier and then converted into an intermediate frequency band (IF band) by a clock generated by a local oscillator. The received signal whose frequency has been converted to the IF band passes through the BPF, and then the automatic gain control circuit (AG
After being corrected to an appropriate signal level by C), quasi-coherent detection is performed and the frequency is converted to the baseband. The low-pass filter (LP
F) After passing, analog-digital conversion (A / D conversion)
It becomes a digital signal and is output. Reception radio unit 32
The despreading unit 33 despreads the received digital signal output from, and outputs the narrowband modulated signal. The signal output from the despreading unit 33 is demodulated in the interpolation / interpolation synchronous detection unit 22. Of the demodulated signals, the information signal is decoded by the Viterbi decoding unit,
Is output. Further, the transmission power control bit is extracted by the transmission power control bit extraction unit 48 and output to the transmission power control unit 49. The transmission power control unit 49 determines the transmission power based on the transmission power control bit and outputs the control information to the transmission wireless unit 46. On the other hand, the reception SIR is obtained from the reception signal despread by the despreading unit 33 as described above with reference to FIG.
【００２５】送信電力制御ビット決定部４１において、
受信ＳＩＲはあらかじめ設定されている目標ＳＩＲと比
較される。受信ＳＩＲが目標ＳＩＲよりも小さい場合に
は、送信電力の増加を指示する制御ビットを、受信ＳＩ
Ｒが目標ＳＩＲよりも大きい場合には、送信電力の減少
を指示する制御ビットを発生し、信号発生部４２に出力
する。信号発生部４２において、送信電力制御ビット決
定部４１から送られた送信電力制御ビットを含めた送信
フレームの構成を行い、符号化部４３に出力する。符号
化された送信信号は変調部４４で変調、拡散部４５で拡
散された後、送信無線部４６に出力される。送信無線部
４６において、１Ｆ、ＲＦ帯に周波数変換された送信信
号は、送信電力制御部４９から出力される制御情報に基
づいた送信電力で送信される。In the transmission power control bit determining section 41,
The received SIR is compared with a preset target SIR. If the received SIR is smaller than the target SIR, the control bit for increasing the transmission power is set to the received SI.
When R is larger than the target SIR, a control bit for instructing the reduction of transmission power is generated and output to the signal generator 42. The signal generation unit 42 configures the transmission frame including the transmission power control bits sent from the transmission power control bit determination unit 41, and outputs the transmission frame to the encoding unit 43. The encoded transmission signal is modulated by the modulation unit 44, spread by the spreading unit 45, and then output to the transmission wireless unit 46. In the transmission wireless unit 46, the transmission signal frequency-converted into the 1F and RF bands is transmitted with the transmission power based on the control information output from the transmission power control unit 49.
【００２６】図４は、本発明を適用した場合の送信電力
制御誤差特性を示すグラフである。横軸はフレーム周期
で規格化された最大ドップラー周波数ｆD Ｔtpc 、縦軸
は受信ＳＩＲと目標ＳＩＲの差分の標準偏差である。こ
こで、送信電力制御ステップは１ｄＢ、制御遅延は２Ｔ
tpc とした。実線は完全に受信ＳＩＲを測定できた場合
の特性、白丸のプロットが本発明を用いた場合の特性を
示す。グラフから、理想的な場合からの劣化がほとんど
ない特性が得られることがわかる。FIG. 4 is a graph showing transmission power control error characteristics when the present invention is applied. The horizontal axis represents the maximum Doppler frequency f D T tpc normalized by the frame period, and the vertical axis represents the standard deviation of the difference between the received SIR and the target SIR. Here, the transmission power control step is 1 dB, and the control delay is 2T.
It was tpc . The solid line shows the characteristic when the reception SIR can be completely measured, and the white circle plot shows the characteristic when the present invention is used. From the graph, it can be seen that a characteristic with almost no deterioration from the ideal case is obtained.
【００２７】また、グラフからｆD Ｔtpc が大きい場合
には、制御誤差がほとんど飽和していることがわかる。
これは、フェージングが速くなると送信電力制御が瞬時
変動に追従することができなくなるためである。従っ
て、フェージングの速さを検出し、高速フェージングの
場合には、瞬時変動に追従する送信電力制御を止めるこ
とにより、装置の省電力化を測ることができる。Further, it can be seen from the graph that the control error is almost saturated when f D T tpc is large.
This is because the transmission power control cannot follow the instantaneous fluctuation when the fading becomes fast. Therefore, it is possible to measure the power saving of the apparatus by detecting the fading speed and stopping the transmission power control that follows the instantaneous fluctuation in the case of the high speed fading.
【００２８】図５は、この高速フェージングを検出して
送信電力制御を停止するための送信電力制御装置の実施
形態である。ここで、図２および図３と同様の構成に
は、同じ符号を付す。図５において、５０はフェージン
グ・エンベロープ電力変化量検出部、５１はフェージン
グ・エンベロープ電力変化量比較部を示している。FIG. 5 shows an embodiment of a transmission power control apparatus for detecting the high speed fading and stopping the transmission power control. Here, the same components as those in FIGS. 2 and 3 are denoted by the same reference numerals. In FIG. 5, reference numeral 50 denotes a fading envelope power change amount detection unit, and 51 denotes a fading envelope power change amount comparison unit.
【００２９】さて、図５において、フェージング・エン
ベロープ電力変化量検出部５０において、フレームの両
端にある内挿補間に用いられるパイロット・シンボルの
電力量を求め、その差分を求めている。その差分はフェ
ージング・エンベロープの電力変化量を表している。こ
の差分と電力変化量の絶対値と予め定められている許容
変化量とを、フェージング・エンベロープ電力変化量比
較部５１において比較する。フェージング・エンベロー
プの変化量が許容値を超える場合には、送信電力制御を
止める情報を送信無線部４６に出力し送信電力制御を止
める。再び、フェージング・エンベロープの変化量が許
容値以下になった場合には、送信電力制御を再開する情
報を送信無線部４６に出力し、送信電力制御部４９から
出力される制御情報に基づいた送信電力制御を再開す
る。In FIG. 5, the fading / envelope power change amount detecting unit 50 finds the amount of power of pilot symbols used for interpolation at both ends of the frame and finds the difference between them. The difference represents the power change amount of the fading envelope. The fading / envelope power change amount comparison unit 51 compares the difference, the absolute value of the power change amount, and a predetermined allowable change amount. When the amount of change in the fading envelope exceeds the allowable value, information for stopping the transmission power control is output to the transmission wireless unit 46, and the transmission power control is stopped. When the amount of change in the fading envelope becomes equal to or less than the allowable value again, the information for restarting the transmission power control is output to the transmission wireless unit 46, and the transmission based on the control information output from the transmission power control unit 49 is performed. Restart power control.
【００３０】このように、送信電力制御を停止すること
により、装置全体の省電力が図れる。In this way, by stopping the transmission power control, the power consumption of the entire device can be saved.
【００３１】[0031]
【発明の効果】以上詳細に説明したように、クローズド
ループによる送信電力制御が必須であるＣＤＭＡ方式を
用いる移動通信において、受信ＳＩＲ測定精度の向上、
受信ＳＩＲ測定装置構成の単純化を図ることが可能であ
る。As described in detail above, in the mobile communication using the CDMA system in which the transmission power control by the closed loop is essential, the reception SIR measurement accuracy is improved,
It is possible to simplify the configuration of the reception SIR measurement device.
【図１】本発明の内挿補間同期検波に用いられるフレー
ム構成例を示す図である。FIG. 1 is a diagram showing an example of a frame configuration used for interpolation interpolation synchronous detection of the present invention.
【図２】本発明の受信ＳＩＲ測定装置の構成を示すブロ
ック図である。FIG. 2 is a block diagram showing a configuration of a reception SIR measuring apparatus of the present invention.
【図３】本発明の送信電力制御装置の一実施形態を示す
ブロック図である。FIG. 3 is a block diagram showing an embodiment of a transmission power control device of the present invention.
【図４】本発明の送信電力制御装置の送信電力制御誤差
特性を示すグラフである。FIG. 4 is a graph showing a transmission power control error characteristic of the transmission power control device of the present invention.
【図５】本発明の送信電力制御装置の他の実施形態を示
すブロック図である。FIG. 5 is a block diagram showing another embodiment of the transmission power control apparatus of the present invention.
【図６】従来のＳＩＲ測定装置の構成を示すブロック図
である。FIG. 6 is a block diagram showing a configuration of a conventional SIR measurement device.
１ 受信信号 ２ 包絡線検波器 ３ 全受信電力 ４ 逆拡散器 ５ 希望波受信電力検出部 ６ 希望波受信電力 ７ 干渉電力検出部 ８ 干渉電力 ９ ＳＩＲ検出部 １０ 受信ＳＩＲ ２０ ベースバンド受信信号 ２１ 同期部 ２２ 内挿補間同期検波部 ２３ 情報シンボル ２４ 判定信号電力計算部 ２５ 疑似干渉電力計算部 ２６ 積算部 ２７ 積算部 ２８ ＳＩＲ測定部 ２９ 受信ＳＩＲ ３０ アンテナ ３１ 送受分離部 ３２ 受信無線部 ３３ 逆拡散部 ４１ 送信電力制御ビット決定部 ４２ 信号発生部 ４３ 符号化部 ４４ 変調部 ４５ 拡散部 ４６ 送信無線部 ４７ ビタビ復号部 ４８ 送信電力制御ビット抽出部 ４９ 送信電力制御部 ５０ フェージング・エンベロープ電力変化量検出部 ５１ フェージング・エンベロープ電力変化量比較部 1 Received Signal 2 Envelope Detector 3 Total Received Power 4 Despreader 5 Desired Wave Received Power Detection Unit 6 Desired Wave Received Power 7 Interference Power Detector 8 Interference Power 9 SIR Detector 10 Received SIR 20 Baseband Received Signal 21 Synchronization Part 22 Interpolation interpolating synchronous detection part 23 Information symbol 24 Judgment signal power calculation part 25 Pseudo interference power calculation part 26 Integration part 27 Integration part 28 SIR measurement part 29 Reception SIR 30 Antenna 31 Transmission and reception separation part 32 Reception radio part 33 Despreading part 41 transmission power control bit determination unit 42 signal generation unit 43 encoding unit 44 modulation unit 45 spreading unit 46 transmission radio unit 47 Viterbi decoding unit 48 transmission power control bit extraction unit 49 transmission power control unit 50 fading envelope power change amount detection unit 51 Fading Envelope Power Change Comparison Unit
Claims (3)
で情報信号に挿入されている信号を用いている移動無線
の受信ＳＩＲ測定装置において、 パイロット信号を用いて内挿補間同期検波する同期検波
手段と、 内挿補間により判定された情報データ・シンボルの電力
値を計算する手段と、 情報データ・シンボルの前記電力値を所定のパイロット
信号間隔間で積算値を求める手段と、 判定された前記情報データ・シンボルと同一サンプリン
グ・タイムにおけるフェージング・エンベロープとの電
力値の差を計算する手段と、 電力値の前記差を所定のパイロット信号間隔間で積算値
を求める手段と、 情報データ・シンボルの電力値の前記積算値と、電力差
の前記積算値との比を計算する手段とを備え、 計算結果の前記比を受信希望信号対干渉信号電力比（Ｓ
ＩＲ）として用いることを特徴とする移動無線の受信Ｓ
ＩＲ測定装置。1. In a mobile radio reception SIR measuring apparatus using a signal in which a known pilot signal is inserted into an information signal at a predetermined interval, a synchronous detection means for performing interpolation interpolation synchronous detection using the pilot signal. A means for calculating the power value of the information data symbol determined by interpolation, a means for obtaining an integrated value of the power value of the information data symbol for a predetermined pilot signal interval, and the determined information A means for calculating the difference in power value between the data symbol and the fading envelope at the same sampling time; a means for obtaining the integrated value of the difference in power value between predetermined pilot signal intervals; and a power for the information data symbol. Means for calculating a ratio between the integrated value of the values and the integrated value of the power difference, No. power ratio (S
Mobile radio reception S characterized by being used as IR)
IR measuring device.
得られたＳＩＲと、予め定められているＳＩＲの目標値
とを比較する手段と、 前記比較結果に基づき対向局に対して送信電力制御情報
を発する手段と、 対向局から送信された前記送信電力制御情報を受信して
復調する手段と、 復調された前記送信電力制御情報に従い、自局の送信電
力を制御する手段とを具備することを特徴とする請求項
１記載の受信ＳＩＲ測定装置を用いた送信電力制御装
置。2. A means for comparing an SIR obtained from the reception SIR measuring device according to claim 1 with a predetermined target value of SIR, and transmission power control for an opposite station based on the comparison result. A means for transmitting information, a means for receiving and demodulating the transmission power control information transmitted from the opposite station, and a means for controlling the transmission power of the own station according to the demodulated transmission power control information A transmission power control apparatus using the reception SIR measuring apparatus according to claim 1.
て、 パイロット信号間におけるフェージング・エンベロープ
の前記電力値の変化量を計算する手段と、 フェージング・エンベロープの電力値の前記変化量と、
予め定められている許容変化量とを比較する手段と、 フェージング・エンベロープの前記変化量が許容値を超
える場合には、送信電力制御を止める手段とを具備する
ことを特徴とする送信電力制御装置。3. The transmission power control device according to claim 2, further comprising means for calculating the amount of change in the power value of the fading envelope between pilot signals, and the amount of change in the power value of the fading envelope.
A transmission power control device comprising: means for comparing with a predetermined allowable change amount; and means for stopping the transmission power control when the change amount of the fading envelope exceeds an allowable value. .
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09157996A JP3358782B2 (en) | 1996-04-12 | 1996-04-12 | Received SIR measurement device and transmission power control device |
| CA002224271A CA2224271C (en) | 1996-04-12 | 1997-04-14 | Method and instrument for measuring receiving sir and transmission power controller |
| US08/983,412 US6034952A (en) | 1996-04-12 | 1997-04-14 | Method and instrument for measuring receiving SIR and transmission power controller |
| PCT/JP1997/001289 WO1997039545A1 (en) | 1996-04-12 | 1997-04-14 | Method and instrument for measuring receiving sir and transmission power controller |
| DE69736695T DE69736695T8 (en) | 1996-04-12 | 1997-04-14 | METHOD AND INSTRUMENT FOR MEASURING THE SIGNAL INTERFERENCE RATIO AND TRANSMITTER |
| EP97915720A EP0833472B1 (en) | 1996-04-12 | 1997-04-14 | Method and instrument for measuring receiving sir and transmission power controller |
| KR1019970709275A KR100321865B1 (en) | 1996-04-12 | 1997-04-14 | Mehtod and instrument for measuring receiving sir and transmission power |
| CN97190522A CN1111986C (en) | 1996-04-12 | 1997-04-14 | Method and instrument for measuring receiving SIR and transmission power controller |
| EP06076359A EP1708396A3 (en) | 1996-04-12 | 1997-04-14 | Method and instrument for measuring SIR and transmission power control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09157996A JP3358782B2 (en) | 1996-04-12 | 1996-04-12 | Received SIR measurement device and transmission power control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09284205A true JPH09284205A (en) | 1997-10-31 |
| JP3358782B2 JP3358782B2 (en) | 2002-12-24 |
Family
ID=14030460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09157996A Expired - Fee Related JP3358782B2 (en) | 1996-04-12 | 1996-04-12 | Received SIR measurement device and transmission power control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3358782B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002314481A (en) * | 2001-04-13 | 2002-10-25 | Kddi Corp | Multi-beam cellular wireless base station, mobile station and spread spectrum signal transmission method |
| US6643272B1 (en) | 1998-04-25 | 2003-11-04 | Samsung Electronics Co., Ltd. | Power level arbitration between base station and mobile station in mobile communication system |
| US7110436B2 (en) | 2000-09-18 | 2006-09-19 | Nec Corporation | CDMA receiving apparatus with transmission power control using previous SIR value |
| US7123645B2 (en) | 2000-08-07 | 2006-10-17 | Fujitsu Limited | Spread-spectrum signal receiver |
| JP2006295767A (en) * | 2005-04-14 | 2006-10-26 | Nec Corp | Reception power measuring method for cdma mobile communication system, and cdma mobile communication system |
| US7174182B2 (en) | 2002-04-23 | 2007-02-06 | Nec Corporation | Transmitting electric power control method in the CDMA system |
| US7283510B2 (en) | 2002-02-14 | 2007-10-16 | Fujitsu Limited | Wireless receiver estimating power of interference |
| JP2008537852A (en) * | 2005-02-14 | 2008-09-25 | アイピーワイヤレス，インコーポレイテッド | Determining radio link quality in wireless networks |
| US7643547B2 (en) | 2005-01-14 | 2010-01-05 | Ntt Docomo, Inc. | Radio quality estimation system, base station, mobile station, and radio quality estimation method |
-
1996
- 1996-04-12 JP JP09157996A patent/JP3358782B2/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6643272B1 (en) | 1998-04-25 | 2003-11-04 | Samsung Electronics Co., Ltd. | Power level arbitration between base station and mobile station in mobile communication system |
| US7123645B2 (en) | 2000-08-07 | 2006-10-17 | Fujitsu Limited | Spread-spectrum signal receiver |
| US7110436B2 (en) | 2000-09-18 | 2006-09-19 | Nec Corporation | CDMA receiving apparatus with transmission power control using previous SIR value |
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