JP3672461B2 - Signal-to-interference ratio estimation device - Google Patents

Description

ここで、「Dp'*Pn'*Wp' + Dt'*Pn'*Wt'」は、送信信号波である「Dp*Pn*Wp + Dt*Pn*Wt」とは異なるマルチパス波を示し、noiseはその他の外来雑音を示す。
【００３０】
まず、受信信号波の逆拡散を行って、Ｐchより、干渉信号波の電力を推定できることを示す。上記の（２）式に示される受信信号波Rxに対して、Ｐch直交符号Wp及び拡散符号Pnを用いて逆拡散を行い、各逆拡散の総和を求めることにより、Ｐchのデータ成分を取り出す。
【００３１】

ここで、上記の（３）式の第１項はＰchのデータ成分を示す。第２項はWtとWpとが完全直交性を有するため０となる。第３項以降は干渉信号波成分となる。
【００３２】
したがって、干渉信号波の電力Ｉは、第３項以降の干渉信号波成分の電力となるので、下記の（４）式のようになる。なお、式中の「Ｘ^2」は、Ｘの「２乗」を示しており、以下同様に用いる。
【００３３】

次に、受信信号波の逆拡散を行って、Ｔchより、干渉信号波の電力を推定できることを示す。上記の（２）式に示される受信信号波Rxに対して、Ｔch直交符号Wt及び拡散符号Pnを用いて逆拡散を行い、各逆拡散の総和を求めることにより、Ｔchのデータ成分を取り出す。
【００３４】
ΣΣRx*Pn*Wt = ΣΣDp*Pn*Wp*Pn*Wt + ΣΣDt*Pn*Wt*Pn*Wt
+ ΣΣDp'*Pn'*Wp'*Pn*Wt + ΣΣDt'*Pn'*Wt'*Pn*Wt
+ ΣΣnoise*Pn*Wt
= Dt + Dp*ΣWt*Wp
+ ΣΣDp'*Pn'*Wp'*Pn*Wt + ΣΣDt'*Pn'*Wt'*Pn*Wt
+ ΣΣnoise*Pn*Wt ・・・（５）
【００３５】
したがって、干渉信号波の電力Ｉは第３項以降の干渉信号波成分の電力となるので、下記の（６）式のようになる。
【００３６】

上記の（４）式と（６）式とを比べれば明らかなように、干渉信号波の電力Ｉの算出は、ＰchとＴchとのどちらのチャネルを用いても同一の結果が得られて、既知データを有していれば推定できることがわかる。
【００３７】
従って、この実施形態では、送信電力制御を受けていないが既知データを有するＰchを用いて干渉信号波の電力を推定し、送信電力制御を受けているＴchを用いて希望信号波の電力を推定している。これを踏まえて、以下、実施形態の動作を説明する。
【００３８】
信号波入力端子１０より入力された受信ベースバンド信号波はＰch相関器２１に与えられる。
【００３９】
Ｐch相関器２１では、Ｐch直交符号乗積器２１Ａにおいて、与えられたベースバンド信号波にＰchの直交符号Wpが乗算され、さらにＮchip相関器２１Ｂにおいて、拡散符号Pnが乗算されて逆拡散され、その逆拡散値がＮチップ分加算されてＰch相関値としてチャネル推定器２２と遅延器２３とに出力される。
【００４０】
チャネル推定器２２では、Ｐch相関値の例えば移動平均を採ることにより平滑化を行い、伝搬路推定値として干渉信号波推定器２４に出力される。
【００４１】
遅延器２３では、チャネル推定器２２の出力遅延を考慮して、Ｐch相関値が遅延されてＰch遅延相関値として干渉信号波推定器２４に出力される。
【００４２】
干渉信号波推定器２４では、前述したＰch遅延相関値と伝搬路推定値とが入力されてそれらの差分が演算され、その差分値が干渉信号波成分 BI(t)として出力される。ここでt は時系列を示す。
【００４３】
他方、信号波入力端子１０より入力された受信ベースバンド信号波は、Ｔch相関器３１にも与えられる。
【００４４】
Ｔch相関器３１では、Ｔch直交符号乗積器３１Ａにおいて、与えられたベースバンド信号波にＴchの直交符号Wtが乗算され、さらにＮchip相関器３１Ｂにおいて、拡散符号Pnが乗算されて逆拡散され、その逆拡散値がＮチップ分加算されてＴch相関値としてＴＰＣシンボル取り出し器３２に出力される。
【００４５】
ＴＰＣシンボル取り出し器３２では、前フレームのＴch信号波のＴＰＣ制御で得られたＴＰＣシンボルの位置情報を利用して、Ｔch相関器３１からのＴch相関値のＴＰＣシンボル部分の値が取り出され、そのＴch相関値が希望信号波成分BS(t)として出力される。
【００４６】
ここで、干渉信号波電力演算回路２５では、干渉信号波成分BI(t) が入力され、下記の（７）式に示す演算によって、干渉信号波の電力値Ｉが算出され、その電力値がＳＩＲ演算回路４０に出力される。
【００４７】
Ｉ = [1/N*Σ|BI(t)|]^2 ・・・（７）
なお、N は、BI(t) の時間平均区間であり、予め定めた定数である。
【００４８】
一方、希望信号波電力演算回路３３では、希望信号波成分BS(t) が入力され、下記の（８）式に示す演算によって、希望信号波の電力値Ｓが算出され、その電力値がＳＩＲ演算回路４０に出力される。
【００４９】
Ｓ = [1/N*Σ|BS(t)|]^2 ・・・（８）
【００５０】
さらに、ＳＩＲ演算回路４０では、それぞれ別のチャネルから演算された、干渉信号波電力Ｉと希望信号波電力Ｓとが入力されて、受信ＳＩＲが演算されて出力されることになる。ここで、受信ＳＩＲの演算方法は、例えば単純に除算を行っても良いし、さらにデシベル変換を行った後に減算を行っても良い。
【００５１】
なお、このように推定されたＳＩＲは、送信側の送信電力制御装置に与えられ、送信電力制御装置では、与えられたＳＩＲに基づいて送信電力の制御を行い（例えば与えられたＳＩＲが所定の値よりも低い場合には送信電力を強くしてＳＩＲを高くする制御を行い）、干渉信号波によって通信品質が劣化することを防止することができる。
【００５２】
（Ｄ） 効果の説明
以上のように、この一実施形態によれば、（１）送信電力制御を受けていない既知データを有するＰch信号波から干渉信号波の電力を推定する干渉信号波電力推定部２０と、（２）Ｐch信号波と同一伝搬路を通過してきた送信電力制御を受けたＴch信号波から希望信号波の電力を推定する希望信号波電力推定部３０と有するので、既知データを有するＰch信号波が送信電力制御を受けてなく一定の場合であっても、干渉信号波電力を精度良く算出すると共に、希望信号波電力についても送信電力制御を受けたものが推定可能となり、ＳＩＲを求めることができる。
【００５３】
（Ｅ） 他の実施形態
前記一実施形態では、干渉信号波の電力を推定するチャネルがＰchである場合を示したが、既知データを有するチャネルであれば他のチャネルであっても良い。また、希望波信号波の電力を推定するチャネルがＴchである場合を示したが、送信電力制御を受けているチャネルであれば他のチャネルであっても良い。
【００５４】
また、前記一実施形態では、Ｐch相関器２１は、与えられたベースバンド信号波にＰchの直交符号を乗算し、さらに拡散符号を乗算することによりＰch相関値を求めたが、与えられたベースバンド信号波に拡散符号を乗算し、さらにＰchの直交符号を乗算することによりＰch相関値を求めても良い。また、Ｔch相関器３１は、与えられたベースバンド信号波にＴchの直交符号を乗算し、さらに拡散符号を乗算することによりＴch相関値を求めたが、与えられたベースバンド信号波に拡散符号を乗算し、さらにＴchの直交符号を乗算することによりＴch相関値を求めても良い。
【００５５】
さらに、前記一実施形態では、干渉信号波の電力を推定する構成部分として、チャネル推定器２２と遅延器２３と干渉信号波推定器２４と干渉信号波電力演算回路２５とから構成されるものを示したが、このような構成に限定することなく、同様な推定機能を有する他の既知構成であっても良い。
【００５６】
さらに、前記一実施形態では、Ｐchの信号波が送信電力制御を受けないものを示したが、従来と同様に、送信電力制御を受ける場合であっても、干渉信号波の電力を推定できるので勿論良い。
【００５７】
【発明の効果】
以上のように、本発明によれば、パイロットチャネルとは異なるチャネルであって、送信電力制御がなされているチャネルを介して、周期的に送信される、送信電力制御に用いられるＴＰＣシンボルを受信するＴＰＣシンボル受信手段と、ＴＰＣシンボル受信手段が受信した周期的なＴＰＣシンボルを用いて、希望信号波の電力情報を算出する希望信号波電力算出手段と、干渉信号波の電力情報を算出する干渉信号波電力算出手段と、希望信号波の電力情報と干渉信号波の電力情報とに基づいて、受信ＳＩＲを算出するＳＩＲ算出手段とを備えることにより、送信電力制御を受けているチャネルに周期的に送信されるＴＰＣ信号を用いて、受信信号波から希望信号波の電力を推定でき、ＳＩＲを求めることができる。
【図面の簡単な説明】
【図１】一実施形態のＳＩＲ推定装置の構成を示すブロック図である。
【符号の説明】
２０…干渉信号波電力推定部、３０…希望信号波電力推定部。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a signal-to-interference ratio estimation apparatus, and can be applied to transmission power control of a communication system using a code division multiple access (CDMA) system, for example.
[0002]
[Prior art]
Conventionally, in a CDMA communication system, the transmission power from the transmission side is controlled according to the power level of the interference signal wave mixed on the propagation path in order to increase the number of accommodated lines and improve communication quality. .
[0003]
Specifically, on the receiving side, the power of the desired signal wave (target signal wave to be received) and the power of the interference signal wave are estimated from the received signal wave, and a signal to interference ratio (SIR) is obtained. ) And the transmission power is controlled on the transmission side based on the obtained SIR.
[0004]
As a method for estimating the power of the desired signal wave and the power of the interference signal wave on the receiving side, known data (for example, all “1” data) such as a pilot channel continuously transmitted from the transmitting side is used. The received signal wave is despread, and the despread value is averaged to cancel the level fluctuation of the interference signal wave to estimate the power of the desired signal wave, and the received signal wave despread value and There is a method of estimating the power of the interference signal wave from the difference from the averaged despread value.
[0005]
[Problems to be solved by the invention]
By the way, the signal wave of the pilot channel is a signal wave for performing automatic control of its own system. Unlike the signal wave of the traffic channel for transmitting data, the pilot channel signal wave is not subjected to transmission power control (for example, a constant wave). May be transmitted (with transmit power).
[0006]
However, in the conventional SIR estimation method, it is assumed that the pilot channel signal wave is subjected to transmission power control in the same manner as the traffic channel signal wave, and the pilot channel signal wave is not subjected to transmission power control. In this case, there is a problem that the power of the desired signal wave cannot be estimated and cannot be applied.
[0007]
In the above description, the case where the signal wave for estimating the SIR is a signal wave of a pilot channel has been described. However, if the signal wave has known data, the signal wave of other channels is not limited to the pilot channel. Of course, signal waves are also acceptable.
[0008]
Therefore, there has been a demand for an SIR (signal-to-interference ratio) estimation device that can estimate SIR even when a signal wave having known data is not subjected to transmission power control.
[0009]
[Means for Solving the Problems]
In order to solve this problem, the signal-to-interference ratio estimation apparatus of the present invention is (1) periodically transmitted via a channel different from the pilot channel and subjected to transmission power control. TPC symbol receiving means for receiving TPC symbols used for transmission power control, and (2) desired signal wave power calculation for calculating power information of the desired signal wave using the periodic TPC symbols received by the TPC symbol receiving means. Means, (3) interference signal wave power calculating means for calculating power information of the interference signal wave, and (4) SIR for calculating the received SIR based on the power information of the desired signal wave and the power information of the interference signal wave. And a calculating means.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment to which an SIR (signal-to-interference ratio) estimation apparatus according to the present invention is applied will be described in detail with reference to the drawings.
[0011]
(A) Explanation of Configuration FIG. 1 is a block diagram showing the configuration of the SIR estimation apparatus of this embodiment. In FIG. 1, the SIR estimation apparatus includes a signal wave input terminal 10, an interference signal wave power estimation unit 20, a desired signal wave power estimation unit 30, and a SIR calculation circuit 40.
[0012]
First, the signal wave input terminal 10 includes a pilot channel (Pch) that is a single-path wave and is not subjected to transmission power control, and a control bit (for example, a TPC symbol) that is not subject to power fluctuation depending on the transmission rate. A baseband signal wave that passes through the same propagation path and is code-multiplexed with a traffic channel (Tch) subjected to transmission power control in a completely orthogonal manner is input. Note that the input baseband signal wave is given to the interference signal wave power estimation unit 20 and the desired signal wave power estimation unit 30.
[0013]
The interference signal wave power estimation unit 20 estimates the power of the interference signal wave mixed on the propagation path from the Pch signal wave code-multiplexed with the baseband signal wave. The interference signal wave power estimation unit 20 includes a Pch correlator 21, a channel estimator 22, a delay unit 23, an interference signal wave estimator 24, and an interference signal wave power calculation circuit 25.
[0014]
The Pch correlator 21 multiplies the supplied baseband signal wave by the Pch orthogonal code in the Pch orthogonal code multiplier 21A, and further despreads the result by multiplying by the spreading code in the Nchip correlator 21B. The spread values are added for N chips and given to the channel estimator 22 and the delay unit 23 as Pch correlation values.
[0015]
The channel estimator 22 averages the Pch correlation value from the Pch correlator 21 so that the level fluctuation of the interference signal wave in the correlation value is canceled and takes a moving average, and averages the correlation. The value is given to the interference signal wave signal estimator 24 as a propagation path estimation value.
[0016]
The delay unit 23 delays the Pch correlation value from the Pch correlator 21 by the time required for the channel estimator 22 to average. By providing the delay unit 23, the output timing of the Pch correlation value output from the delay unit 23 and the output timing of the propagation path estimation value output from the channel estimator 22 coincide.
[0017]
The interference signal wave estimator 24 estimates the interference signal wave component included in the Pch correlation value from the delay unit 23 based on the propagation path estimation value from the channel estimator 22 (specifically, the propagation path estimation value). And the Pch correlation value are calculated), and the estimated value is output to the interference signal wave power calculation circuit 25.
[0018]
The interference signal wave power calculation circuit 25 calculates the power value of the interference signal wave from the estimated value from the interference signal wave estimator 24, and gives the calculated power value of the interference signal wave to the SIR calculation circuit 40.
[0019]
The desired signal wave power estimation unit 30 estimates the power of the Tch signal wave from the Tch signal wave code-multiplexed with the baseband signal wave. The Tch signal wave is a signal wave for data transmission and is a target signal wave (desired signal wave) received on the receiving side. The desired signal wave power estimation unit 30 includes a Tch correlator 31, a TPC symbol extractor 32, and a desired signal wave power calculation circuit 33.
[0020]
The Tch correlator 31 multiplies the supplied baseband signal wave by the Tch orthogonal code in the Tch orthogonal code multiplier 31A, and further multiplies and despreads the spread code in the Nchip correlator 31B. The spread value is added by N chips and given to the TPC symbol extractor 32 as a Tch correlation value.
[0021]
The TPC symbol extractor 32 extracts the value of the TPC symbol portion of the Tch correlation value from the Tch correlator 31 using the position information of the TPC symbol obtained by the TPC control of the Tch signal wave of the previous frame. The correlation value is output to the desired signal wave power calculation circuit 33.
[0022]
The desired signal wave power calculation circuit 33 calculates the power value of the desired signal wave from the Tch correlation value from the TPC symbol extractor 32 and gives the calculated power value of the desired signal wave to the SIR calculation circuit 40.
[0023]
Further, the SIR calculation circuit 40 calculates SIR from the interference signal wave power value from the interference signal wave power calculation circuit 25 and the desired signal wave power value from the desired signal wave power calculation circuit 33. As this calculation method, for example, division may be simply performed, or subtraction may be performed after decibel conversion.
[0024]
(B) Description of Operation As described above, in this embodiment, the transmission signal wave is obtained by code-multiplexing a Pch signal wave and a Tch signal wave completely orthogonally. On the other hand, it is assumed that two multipath waves are received on the receiving side.
[0025]
Therefore, even for a transmission signal wave that is code-multiplexed with Pch that is not subjected to transmission power control and Tch that is subjected to transmission power control, the power of the interference signal wave is estimated from both channels on the receiving side. Show what you can do.
[0026]
As described above, the transmission signal wave Tx is expressed by the following equation (1).
[0027]
Tx = Dp * Pn * Wp + Dt * Pn * Wt (1)
Here, Dp is a Pch data component, Dt is a Tch data component, Pn is a spreading code, Wp is a Pch orthogonal code, and Wt is a Tch orthogonal code.
[0028]
Further, assuming that the received signal wave Rx is a multipath two wave, it is expressed by the following equation (2).
[0029]

Here, "Dp '* Pn' * Wp '+ Dt' * Pn '* Wt'" indicates a multipath wave different from "Dp * Pn * Wp + Dt * Pn * Wt", which is a transmission signal wave. , Noise indicates other external noise.
[0030]
First, it is shown that the power of the interference signal wave can be estimated from Pch by despreading the received signal wave. The received signal wave Rx shown in the above equation (2) is despread using the Pch orthogonal code Wp and the spread code Pn, and the sum of each despread is obtained to extract the Pch data component.
[0031]

Here, the first term of the above equation (3) indicates the data component of Pch. The second term is 0 because Wt and Wp have complete orthogonality. The third and subsequent terms are interference signal wave components.
[0032]
Therefore, the power I of the interference signal wave is the power of the interference signal wave component from the third term onward, and is expressed by the following equation (4). Note that “X ^ 2” in the equation represents “square” of X, and will be used in the same manner.
[0033]

Next, it is shown that the power of the interference signal wave can be estimated from Tch by despreading the received signal wave. The received signal wave Rx shown in the above equation (2) is despread using the Tch orthogonal code Wt and the spread code Pn, and the sum of each despread is obtained to extract the Tch data component.
[0034]
ΣΣRx * Pn * Wt = ΣΣDp * Pn * Wp * Pn * Wt + ΣΣDt * Pn * Wt * Pn * Wt
+ ΣΣDp '* Pn' * Wp '* Pn * Wt + ΣΣDt' * Pn '* Wt' * Pn * Wt
+ ΣΣnoise * Pn * Wt
= D t + D p * ΣWt * W p
+ ΣΣDp '* Pn' * Wp '* Pn * Wt + ΣΣDt' * Pn '* Wt' * Pn * Wt
+ ΣΣnoise * Pn * Wt (5)
[0035]
Therefore, since the power I of the interference signal wave is the power of the interference signal wave component after the third term, the following equation (6) is obtained.
[0036]

As is clear from the comparison of the above formulas (4) and (6), the calculation of the interference signal wave power I yields the same result regardless of whether the channel is Pch or Tch. It can be understood that the estimation can be made if there is known data.
[0037]
Therefore, in this embodiment, the power of the interference signal wave is estimated using Pch that is not subjected to transmission power control but has known data, and the power of the desired signal wave is estimated using Tch that is subjected to transmission power control. doing. Based on this, the operation of the embodiment will be described below.
[0038]
The received baseband signal wave input from the signal wave input terminal 10 is given to the Pch correlator 21.
[0039]
In the Pch correlator 21, the supplied baseband signal wave is multiplied by the Pch orthogonal code multiplier 21A, and the Pch orthogonal code Wp is multiplied by the spreading code Pn and despread in the Nchip correlator 21B. The despread values are added for N chips and output to the channel estimator 22 and the delay unit 23 as Pch correlation values.
[0040]
The channel estimator 22 performs smoothing by taking, for example, a moving average of the Pch correlation values, and outputs the result to the interference signal wave estimator 24 as a propagation path estimation value.
[0041]
In the delay unit 23, the Pch correlation value is delayed in consideration of the output delay of the channel estimator 22 and is output to the interference signal wave estimator 24 as the Pch delay correlation value.
[0042]
The interference signal wave estimator 24 receives the Pch delay correlation value and the propagation path estimation value described above, calculates the difference between them, and outputs the difference value as the interference signal wave component BI (t). Where t is a time series.
[0043]
On the other hand, the received baseband signal wave input from the signal wave input terminal 10 is also given to the Tch correlator 31.
[0044]
In the Tch correlator 31, the supplied baseband signal wave is multiplied by the Tch orthogonal code multiplier 31A in the Tch orthogonal code multiplier 31A, and further, the spread code Pn is multiplied and despread in the Nchip correlator 31B. The despread values are added for N chips and output to the TPC symbol extractor 32 as a Tch correlation value.
[0045]
The TPC symbol extractor 32 extracts the value of the TPC symbol portion of the Tch correlation value from the Tch correlator 31 using the position information of the TPC symbol obtained by the TPC control of the Tch signal wave of the previous frame. The Tch correlation value is output as the desired signal wave component BS (t).
[0046]
Here, the interference signal wave power calculation circuit 25 receives the interference signal wave component BI (t) and calculates the power value I of the interference signal wave by the calculation shown in the following equation (7). It is output to the SIR operation circuit 40.
[0047]
I = [1 / N * Σ | BI (t) |] ^ 2 (7)
N is a time average interval of BI (t) and is a predetermined constant.
[0048]
On the other hand, the desired signal wave power calculation circuit 33 receives the desired signal wave component BS (t), calculates the power value S of the desired signal wave by the calculation shown in the following equation (8), and the power value is SIR. It is output to the arithmetic circuit 40.
[0049]
S = [1 / N * Σ | BS (t) |] ^ 2 (8)
[0050]
Further, in the SIR calculation circuit 40, the interference signal wave power I and the desired signal wave power S calculated from different channels are input, and the reception SIR is calculated and output. Here, the reception SIR calculation method may be simply division, for example, or may be subtracted after decibel conversion.
[0051]
The estimated SIR is given to the transmission power control apparatus on the transmission side, and the transmission power control apparatus controls the transmission power based on the given SIR (for example, the given SIR is a predetermined value). If it is lower than the value, control is performed to increase the transmission power and increase the SIR), and it is possible to prevent the communication quality from being deteriorated by the interference signal wave.
[0052]
(D) Description of Effects As described above, according to this embodiment, (1) interference signal wave power estimation for estimating the power of an interference signal wave from a Pch signal wave having known data that has not undergone transmission power control. Unit 20 and (2) desired signal wave power estimation unit 30 that estimates the power of the desired signal wave from the Tch signal wave subjected to transmission power control that has passed through the same propagation path as the Pch signal wave. Even when the Pch signal wave that is held is constant without being subjected to transmission power control, the interference signal wave power can be accurately calculated, and the desired signal wave power that has been subjected to transmission power control can be estimated. Can be requested.
[0053]
(E) Other Embodiments In the above embodiment, the channel for estimating the power of the interference signal wave is Pch. However, other channels may be used as long as they have known data. In addition, although the case where the channel for estimating the power of the desired wave signal wave is Tch is shown, other channels may be used as long as the channel is subjected to transmission power control.
[0054]
In the embodiment, the Pch correlator 21 obtains a Pch correlation value by multiplying a given baseband signal wave by a Pch orthogonal code and further by a spreading code. The Pch correlation value may be obtained by multiplying the band signal wave by the spreading code and further multiplying by the Pch orthogonal code. The Tch correlator 31 calculates the Tch correlation value by multiplying the given baseband signal wave by the Tch orthogonal code and further multiplying by the spreading code. And the Tch correlation value may be obtained by further multiplying by the orthogonal code of Tch.
[0055]
Further, in the above-described embodiment, the component configured to estimate the power of the interference signal wave includes the channel estimator 22, the delay unit 23, the interference signal wave estimator 24, and the interference signal wave power calculation circuit 25. Although shown, it is not limited to such a configuration, and may be another known configuration having a similar estimation function.
[0056]
Further, in the above-described embodiment, the Pch signal wave is not subjected to transmission power control. However, as in the prior art, the power of the interference signal wave can be estimated even when the transmission power control is performed. Of course it is good.
[0057]
【The invention's effect】
As described above, according to the present invention, a TPC symbol used for transmission power control that is periodically transmitted via a channel that is different from the pilot channel and for which transmission power control is performed is received. TPC symbol receiving means for performing, desired signal wave power calculating means for calculating power information of a desired signal wave using periodic TPC symbols received by the TPC symbol receiving means, and interference for calculating power information of an interference signal wave a signal wave power calculation means, based on the power information of the interference signal wave and power information of the desired signal wave, by providing a SIR calculating means for calculating a reception SIR, periodically the channel that has received the transmission power control using a TPC signal transmitted to, can estimate the power of a desired signal wave from a reception signal wave can be obtained SIR.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of a SIR estimation apparatus according to an embodiment.
[Explanation of symbols]
20 ... interference signal wave power estimation unit, 30 ... desired signal wave power estimation unit.

Claims (2)

TPC symbol receiving means for receiving TPC symbols used for transmission power control, which are periodically transmitted via a channel different from the pilot channel and subjected to transmission power control;
Desired signal wave power calculating means for calculating power information of a desired signal wave using the periodic TPC symbol received by the TPC symbol receiving means;
Interference signal wave power calculating means for calculating power information of the interference signal wave;
SIR calculating means for calculating a received SIR based on the power information of the desired signal wave and the power information of the interference signal wave;
A signal-to-interference ratio estimation apparatus comprising: 2. The signal according to claim 1, wherein the interference signal wave power calculation unit calculates power information of the interference signal wave based on known data received via a channel not subjected to transmission power control. Anti-interference ratio estimation device.

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