CN100481756C - Unbiased sir estimation for use in power control methods - Google Patents

Abstract

The present invention provides a method for providing an unbiased signal-to-interference (SIR) estimation in a radio communication system. The method comprises the steps of receiving a transmitted signal, estimating the signal energy and an interference value of the received signal, calculating a first SIR estimate based on the estimated signal energy and the interference value, correcting the first estimated SIR-value for nonlinearity by means of a correction function and thereby obtaining a corrected SIR-value, while taking inter-path interference into account, repeatedly calculating the corrected SIR-value on the basis of received signal samples, whereby the same accuracy is achieved regardless of the number of paths occurring in the receiver. The invention further relates to a receiver, system and power control method.

Description

The no inclined to one side signal interference ratio of use in Poewr control method estimated

Technical field

The present invention relates to field of wireless communications systems, relate in particular to a kind of improving one's methods of estimation signal interference ratio (SIR) that no inclined to one side SIR estimates that provide.Not having inclined to one side SIR estimates for example can be used in the uplink power control method in the W-CDMA system.

Background technology

It is very important that the interference that exists in institute's wire/wireless communication system is remained on alap level.Excessive interference can reduce communication quality, perhaps in the worst case, can interrupt an ongoing communication.Have some kinds of methods to manage control and disturb, power control is one of important means that tackles it.

The capacity of CDMA (code division multiple access) system is interference-limited, also do not lie in the time because the isolation of channel has both lain in frequency, but isolate by sign indicating number, and cochannel disturbs very strong.Consider that a plurality of users share same frequency range, other user's signal becomes interference signal and reduces a specific user communication quality thus, and therefore control is disturbed particularly important in cdma system.

In addition, when base station during simultaneously with near-end and far-end mobile communications, the high level that its receives from the near-end travelling carriage transmits, and receives transmitting from the much lower level of far-end travelling carriage.In addition, transmit and reduced by the rapid fading wireless channel.Like this, a problem appears in the communication between base station and the far-end travelling carriage: channel quality is reduced tempestuously by interference and the rapid fading from the near-end travelling carriage.Transmitting power control (TPC) is used to one of technology that solves fading problem.TPC controls transmitting power so that no matter the position of travelling carriage where, the received power of the travelling carriage that is used to receive or SIR (signal interference plus noise power than) remain on a constant level.

In order to have a correct Poewr control method of adjusting travelling carriage power, importantly want accurately to estimate sir value.Especially, importantly the sir measurement value is linear, so that the power command that sends from the base station accurately reflects the suitable adjustment of true input signal strength.Under the situation of non-linear estimations, the base station can provide the power level adjustment that has a little relation with true incoming signal level.

People's such as Tomohiro Dohi US 6,034,952 has described a kind of presently used method that is used to estimate sir value.

" SIR-based Transmit Power Controlof Reverse Link for coherent DS-CDMA Mobile Radio " (IEICE Trans.Vol.E81-B of S.Seo, T.Dohi and F.Adachi, no.7,1508-1516 page or leaf, in July, 1998) a kind of presently used method that is used to estimate sir value has also been described.

These two methods will be described in the detailed description below in more detail.

Because the multipath transmisstion and the multipath transmisstion that occur in the Rake receiver (after Rake merges) are not considered in sir measurement, then exist between the footpath and disturb or self-interference.All do not consider in the middle of the SIR algorithm of describing in the document of mentioning in the above to disturb between the footpath, and these algorithms are not linear under the situation that multipath fading is made up of footpath more than.Wherein, non-linearly cause and must be removed or proofread and correct so that obtains linear SIR estimation by disturbing between the footpath.

The open United States Patent (USP) 6,292,519 of Branislav M.Popovic has been represented immediate prior art.In this document, the measured SIR value be corrected non-linear so that the sir value of proofreading and correct.According to the sir value of current reception calculated correction function in real time, perhaps, correction function can be used to generate the question blank that is stored in the memory for the expected range of tested sir value.

, though this document has been considered internal interference, and correction function nonlinear compensation to a certain degree, and this known method is not accurately considered the actual conditions of receiver.In addition, owing to relate to interpolation method the most without doubt, the use of question blank does not provide the same accurate estimation with recursive calculation usually.Like this, need a kind of improving one's methods to be used for proofreading and correct the non-linear of sir value.

Summary of the invention

The purpose of this invention is to provide a kind of be used to proofread and correct estimate improving one's methods of sir value, especially for example be applied in the Poewr control method.

Further aim of the present invention provides the improvement sir value of reflection to the sir value non-linear effects.

According to a first aspect of the invention, reach these purposes by the following method:

Providing in a kind of receiver of wireless communication system does not have the number of believing one side only interference ratio estimation approach, comprises the steps:

Reception transmits,

The signal energy of estimating received signal and the interference value of received signal,

Calculate SIR estimation based on estimated signals energy and interference value,

Estimate that by double counting first product between sir value and the multiplication factor (D) obtains the correction sir value,

When considering to disturb between the path, proofread and correct sir value according to the double counting of received signal sample, thus with receiver in the footpath number that occurs irrespectively obtain identical estimated accuracy.

Considered to disturb the non-linear effects that causes according to the SIR algorithm for estimating of modification of the present invention to sir value by the multipath in the receiver, and described improvement algorithm has provided identical estimated accuracy, no matter used how many footpaths in the receiver, therefore overcome the shortcoming of prior art, caliber number not in the prior art, that is, no matter be used for the number of branches of Rake receiver, and according to identical mode compensating non-linear.

According to an embodiment of this method, by calculate that a SIR estimates and by $D=1+\frac{N_r-1}{N_r}({\mathrm{\&beta;}}_{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C02829965E00252.png"\; state="\{\{state\}\}">c</figure-callout>}}^2+{\mathrm{\&beta;}}_d^2){\mathrm{<figure-callout\; id="2"\; label="G"\; filenames="C02829965E00252.png"\; state="\{\{state\}\}">G</figure-callout>}}^2$ Product between the multiplication factor D that provides obtains described correction sir value, wherein,

G is the gain factor of power control, G ²By ${\mathrm{<figure-callout\; id="2"\; label="G"\; filenames="C02829965E00252.png"\; state="\{\{state\}\}">G</figure-callout>}}^2=\frac{E_b-S_c\frac{N_r}{N_s}}{({\left(S_c{\mathrm{\&beta;}}_c\right)}^2+\frac{S_c(N_r-1)}{N_s}({\mathrm{\&beta;}}_{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C02829965E00252.png"\; state="\{\{state\}\}">c</figure-callout>}}^2+{\mathrm{\&beta;}}_d^2))}$ Obtain,

Ns is the pilot bits number that is used for estimating,

Nr is the number of Rake fingers that is used for Rake receiver,

Eb is the received signal energy of each data bit,

Sc is the spreading factor of control channel,

β _cAnd β _d(details is referring to third generation partnership project (3GPP, TS25,213) to be arranged on the gain factor of the power ratio between Dedicated Physical Control Channel (DPCCH) and the Dedicated Physical Data Channel (DPDCH).

Therefore this embodiment has considered to be used in the footpath number in the receiver, and has therefore provided the accurate SIR estimation of considering after multipath disturbs.

According to another embodiment of this method, described method in addition the sir value that is higher than 12dB the linearity correction sir value is provided.Like this, even can provide no inclined to one side SIR to estimate, not underestimate and also do not over-evaluate actual sir value for quite high sir value.

According to another embodiment that also has of this method, known β recently _cAnd β _dTo being used for first frame of time Transmission Time Interval (TTI), and correct β _cAnd β _dValue is used for other frame.This embodiment has provided than present employed method even better result, even at β _cAnd β _dBetween the worst case of ratio when changing as much as possible in also be like this.

The invention still further relates to a kind of described Poewr control method of estimating that sir value is improved one's methods of being used to that uses.Transmitting power during described Poewr control method comprises the steps: to control transmitter according to the correction sir value that calculates.The invention still further relates to a kind of receiver, comprise being used to realize the described device of estimating that sir value is improved one's methods of being used to.The invention still further relates to a kind of wireless communication system that comprises at least one described receiver.

Above-mentioned attendant advantages is realized by receiver and wireless communication system.

Described receiver is described below:

A kind of receiver that is used to use in communication system, comprise: be used to receive the device that transmits, the device that is used for the interference value of the signal energy of estimating received signal and received signal, be used for calculating the device that a SIR estimates based on estimated signals energy and interference value, described receiver also comprises: the device that is used for estimating by double counting first the acquisition correction sir value of the product between sir value and the multiplication factor (D), the device that wherein is used to obtain to proofread and correct sir value is arranged in when considering to disturb between the footpath proofreaies and correct sir value according to the double counting of received signal sample, and with receiver in the footpath number that occurs irrespectively provide identical estimated accuracy.

The wireless communication system of signal communication comprises at least one aforesaid receiver between at least two receivers.In addition, wireless communication system comprises at least one base station, and described base station is equipped with at least one described receiver and is used at least one transmitter that the transmit power command signal is given the mobile comm unit that is positioned at the base station respective range.

The mobile comm unit of use in wireless communication system as mentioned above, comprise the receiver that is used for the received power command signal and, be used for transmitter by the power level signal of communication of the power command signal controlling of estimating based on no inclined to one side SIR.

Description of drawings

Fig. 1 shows the basis of up-link power control ring.

Fig. 2 shows the up link spread spectrum scheme among the UTRA/FDD.

It is the TTI of the function of time that Fig. 3 shows, and at this, first frame among the new TTI is Shadowed.

Fig. 4 shows the error between the SIR of real SIR and estimation.

The SIR that Fig. 5 shows inactivity control estimates.

Embodiment

In following explanation, use cdma system--particularly the present invention explains in the W-CDMA system.The present invention can be applied in other system too, and can be used for other application except that described up-link power control.For the following description of better understanding, control with reference to the power that Fig. 1 introduces in the communication system simply.

In the communication system of using power control, carry out two kinds of different loops.At first, a kind of outer shroud feedback control loop (not shown) is arranged, in this loop, radio network controller (RNC) is provided with target SIR or with reference to SIR, and informing base station (Node B) is about this target SIR.Then, the base station is used target SIR and is correspondingly reduced or improve the power that travelling carriage uses.In this feedback control loop, the target SIR that is provided with based on the errored block rate adjustment of expectation in case of necessity.Between base station and travelling carriage, also have a kind of loop faster--interior ring, as shown in Figure 1, in this loop, increase and decrease power based on the received power level in the receiver separately.

A task of the up link inner-loop power control among the UTRA/FDD (UMTS terrestrial radio access/Frequency Division Duplexing (FDD)) is to reduce the influence of rapid fading wireless channel.The base station of W-CDMA system sends to subscriber equipment (UE) with up-link transmission power control (TPC) order.As shown in Figure 1, the TPC order is to locate estimated signals interference ratio (SIR) in the base station.SIR is defined as each data bit (E _b) energy and the ratio of average received interference power (I).Therefore, SIR is the signal-to-jamming ratio of receiver input.This means under the multipath channel situation, should calculate the received signal bit energy by all received signal component power of addition.Simultaneously, should only measure input (promptly outside) disturbs.

In the US 6,292,519 that explains above and mention in the above, because therefore the multipath transmisstion that occurs in Rake receiver has self-interference.According to top definition, in sir measurement, should not consider self-interference.When the sir measurement value is linearity, will accurately reflect the suitable adjustment of true input signal strength from the power command of base station.But under the situation of non-linear estimations, the base station provides the power level that does not reflect true incoming signal level adjustment.

During random access procedure, the user sends its access and asks to network, and each follow-up access attempts is to launch than the power level of the high specified quantitative of last power level (for example 1dB).After the emission of each access attempts, travelling carriage is waited for a specific period so that receive affirmation from the base station.When receiving the confirmation, access attempts finishes, and keeps same power level in the subsequent transmission of travelling carriage on Traffic Channel.Therefore, when the base station began the traffic channel signal of receiving mobile emission, the travelling carriage emitted power can very high and very may make the sir measurement at place, base station saturated.As long as the service channel power control loop such as above-mentioned internal power loop, does not reduce the transmitting power of travelling carriage, then this may continue to become a problem., if measured SIR value is incorrect, then the power control loop road needs the more time and even may not reduce the transmitting power of travelling carriage.Therefore can provide accurate as far as possible SIR to estimate it is most important.

Below, verify current SIR algorithm for estimating (as disclosed algorithms of philtrum such as the document US 6,034,952 mentioned and S.Seo) in the above, and the more accurate SIR that provides according to the present invention estimates, propose new correction algorithm.The relatively more feasible improvement of being made between present employed method and the present invention is distinct.

The analysis of current SIR algorithm for estimating

Up link spread spectrum scheme among the UTRAN/FDD as shown in Figure 2.As shown in Figure 2, received signal y (m) can be represented as

$y\left(m\right)=\underset{n=1}{\overset{N_r}{\mathrm{\&Sigma;}}}\mathrm{\&alpha;}\left(n\right)({\mathrm{j\&beta;}}_c+{\mathrm{\&beta;}}_d{C}_d\left(m\right))\mathrm{Gc}(m-{\mathrm{\&tau;}}_n)+w\left(m\right)$

Despread symbols p among Fig. 2 _k(i) be expressed as

$p_k\left(i\right)=\underset{m=1+i\&CenterDot;S_c}{\overset{(i+1)\&CenterDot;S_c}{\mathrm{\&Sigma;}}}y\left(m\right)c^{*}(m-{\mathrm{\&tau;}}_k)$

For simplicity,

Substitute

Obtain then:

$p_k\left(i\right)=\underset{m}{\mathrm{\&Sigma;}}(\underset{n=1}{\overset{N_r}{\mathrm{\&Sigma;}}}\mathrm{\&alpha;}\left(n\right)(j{\mathrm{\&beta;}}_c+{\mathrm{\&beta;}}_d{C}_d\left(m\right))\mathrm{Gc}(m-{\mathrm{\&tau;}}_n)+w\left(m\right))c^{*}(m-{\mathrm{\&tau;}}_k)$

$p_k\left(i\right)=\underset{m}{\mathrm{\&Sigma;}}\mathrm{\&alpha;}\left(k\right)({\mathrm{j\&beta;}}_c+{\mathrm{\&beta;}}_d{C}_d\left(m\right))\mathrm{Gc}(m-{\mathrm{\&tau;}}_k)c^{*}(m-{\mathrm{\&tau;}}_k)$

$+\underset{m}{\mathrm{\&Sigma;}}\left(\underset{\stackrel{n=1}{n\&NotEqual;k}}{\overset{N_r}{\mathrm{\&Sigma;}}}\mathrm{\&alpha;}\left(n\right)({\mathrm{j\&beta;}}_c+{\mathrm{\&beta;}}_d{C}_d\left(m\right))\mathrm{Gc}(m-{\mathrm{\&tau;}}_n)\right)c^{*}(m-{\mathrm{\&tau;}}_k)$

$+\underset{m}{\mathrm{\&Sigma;}}w\left(m\right)c^{*}(m-{\mathrm{\&tau;}}_k)$

Because:

c(m-τ _k)c ^*(m-τ _k)＝1， $\underset{m}{\mathrm{\&Sigma;}}{C}_d\left(m\right)=0$ And $w_k^{\&prime;}\left(i\right)=\underset{m}{\mathrm{\&Sigma;}}w\left(m\right)c^{*}(m-{\mathrm{\&tau;}}_k)$

So:

$p_k\left(i\right)=\mathrm{j\&alpha;}\left(k\right){\mathrm{\&beta;}}_c{\mathrm{GS}}_c+\underset{m}{\mathrm{\&Sigma;}}\underset{\stackrel{n=1}{n\&NotEqual;k}}{\overset{N_r}{\mathrm{\&Sigma;}}}\mathrm{\&alpha;}\left(n\right)({\mathrm{j\&beta;}}_c+{\mathrm{\&beta;}}_d{C}_d\left(m\right))\mathrm{Gc}(m-{\mathrm{\&tau;}}_n)c^{*}(m-{\mathrm{\&tau;}}_k)+{w\&prime;}_k\left(i\right).$

Despread symbols p _k(i) therefore be expressed as

$p_k\left(i\right)=\mathrm{j\&alpha;}\left(k\right){\mathrm{\&beta;}}_c{S}_{c}G+\underset{m}{\mathrm{\&Sigma;}}\underset{\stackrel{n=1}{n\&NotEqual;k}}{\overset{N_r}{\mathrm{\&Sigma;}}}\mathrm{\&alpha;}\left(n\right)({\mathrm{j\&beta;}}_c+{\mathrm{\&beta;}}_d{C}_d\left(m\right))\mathrm{Gc}(m-{\mathrm{\&tau;}}_n)c^{*}(m-{\mathrm{\&tau;}}_k)+w_k\&prime;\left(i\right)---\left(1\right)$

Wherein,

$w_k\&prime;\left(i\right)=\underset{m}{\mathrm{\&Sigma;}}w\left(m\right)c^{*}(m-{\mathrm{\&tau;}}_k),$

w(m)＝w _re(m)+jw _im(m)，

w _Re(m) and $w_{\mathrm{im}}\left(m\right)\&Element;N(0,\frac{1}{\sqrt{2}}),$

Subscript k delegated path k,

τ _kBe the time delay of path k,

α (k) is the channel coefficients of path k,

C _d(m) be the channel code of DPDCH,

C _cBe the channel code of DPCCH, it equals 1 for all subscripts, and therefore not shown in (1),

C is a scrambler,

C ^*Be the complex conjugate of scrambler,

S _cBe the spreading factor of control channel (=256),

Nr is the number of Rake fingers that is used for the work of Rake receiver,

G is the gain factor of power control,

β _cAnd β _dIt is the gain factor of determining power ratio between Dedicated Physical Control Channel (DPCCH) and the Dedicated Physical Data Channel (DPDCH).That is β, _cBe the gain factor of the control section of signal, and β _dBe the gain factor of the data division of signal, and factor-beta _cAnd β _dCan change that (combinations of transport formats referring to third generation partnership project (3GPP), TS25.212), and can change for each TFC on the radio frames basis.

The gross power of channel coefficients equals 1,

$\underset{k=1}{\overset{N_r}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}^2\left(k\right)=1$

In this specification, suppose that α (k) is a constant on the receiving symbol.Real SIR is similar to:

For example the SIR algorithm for estimating that uses at present in above-mentioned US 6,034,952 can be represented by following equation:

${\mathrm{SIR}}_{\mathrm{est}}=\frac{E_b}{I}-\frac{N_r}{N_s},---\left(3\right)$

$E_b=\underset{k=1}{\overset{N_r}{\mathrm{\&Sigma;}}}{\left|S\left(k\right)\right|}^2,---\left(4a\right)$

$S\left(k\right)=\frac{1}{N_s}\underset{i=1}{\overset{N_s}{\mathrm{\&Sigma;}}}{p}_k\left(i\right)(-j{P}_p\left(i\right)),---\left(4b\right)$

I＝(1-α)I＂+α·I， (5a)

$I\&prime;\&prime;=\frac{1}{N_r}\underset{k=1}{\overset{N_r}{\mathrm{\&Sigma;}}}N\left(k\right),---\left(5b\right)$

$N\left(k\right)=\frac{1}{N_s-1}\underset{i=1}{\overset{N_s}{\mathrm{\&Sigma;}}}{|p_k\left(i\right)(-j{P}_p\left(i\right))-S\left(k\right)|}^2,---\left(5c\right)$

Wherein:

Ns is the pilot bits number that is used to estimate,

Nr is the footpath number,

p _k(i) be i despread symbols,

Pp (i) be i transmitting pilot bits and

α is the filter factor of Interference Estimation, and the value that is used for current algorithm is $\mathrm{\&alpha;}=\frac{302}{303}.$

By using pilot bits to estimate signal power in each footpath, after the energy of adding up then,, estimating power and spreading factor estimate bit energy, as (3), (4a) with (4b) by being multiplied each other from all footpaths.Usually, because frequency pilot sign is usually with higher power level, so the power ratio of estimating pilot frequency symbol estimates that the power of speech (perhaps data) symbol is more reliable.Certainly, estimation other symbol power except that frequency pilot sign is thought within the scope of the present invention.By between estimated signal amplitude and the received signal sample variance of difference estimate to obtain interference power, suc as formula (5a) shown in (5c).

SIR estimates the desired value E{SIR of (3) _EstProvide (details is referring to final section " derivation of formula (6) ") by following formula

$E\left\{{\mathrm{SIR}}_{\mathrm{est}}\right\}=\frac{S_c{\left({\mathrm{\&beta;}}_{c}G\right)}^2}{(1+\frac{N_r-1}{N_r}({\mathrm{\&beta;}}_{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C02829965E00252.png"\; state="\{\{state\}\}">c</figure-callout>}}^2+{\mathrm{\&beta;}}_d^2)G^2)}---\left(6\right)$

From (6) as seen, if N _r=1, then estimated value will with the SIR that provides by (2) _TrueIdentical.If but receiving more than one footpath, then described algorithm will be underestimated SIR (disturb in fact and will be made up of interference (IPI) between AWGN (average-white Gaussian noise) and footpath).If sir target too high (surpassing 10dB) is set, then this may cause problem, will be issued because the unnecessary power that causes transmitting power to increase increases order.

UE (subscriber equipment) may finish with the transmitting power of maximum permission.Two situation examples when non-linear sir measurement causes problem with the power control loop road are that sir measurement is underestimated and over-evaluated respectively.The situation of underestimating SIR will cause unnecessary power to increase order, this means that exterior ring power control will be than faster under linear sir measurement situation., UE will launch the power higher than power demand, cause like this than interference inevitable in the system more to disturb, and unnecessarily shorten the battery life of UE.Second kind of situation, SIR is by too high estimation, and more power reduce order will issue UE, and exterior ring power control will be than slow under the linear SIR estimation condition.When the sir measurement value is linearity, will accurately reflect the suitable adjustment of true input signal strength from the power command of base station.But when having non-linear estimations, as explained before, the base station can provide the power level adjustment that has a little relation with true incoming signal level.

Present employed method can be summarized as follows:

1. the signal energy Eb of each data bit is estimated as de-spread pilot symbols p _k(i) mean value quadratic sum.

$E_b=\underset{k=1}{\overset{N_r}{\mathrm{\&Sigma;}}}{\left|\frac{1}{N_s}\underset{i=1}{\overset{N_s}{\mathrm{\&Sigma;}}}{p}_k\left(i\right)\right|}^2$

2. instantaneous interference I ＂ be estimated as between the mean value of frequency pilot sign and frequency pilot sign squared difference and.

$I\&prime;\&prime;=\frac{1}{N_r}\underset{k=1}{\overset{N_r}{\mathrm{\&Sigma;}}}\frac{1}{N_s-1}\underset{i=1}{\overset{N_s}{\mathrm{\&Sigma;}}}{|p_k\left(i\right)-\frac{1}{N_s}\underset{j=1}{\overset{N_s}{\mathrm{\&Sigma;}}}{p}_k\left(j\right)|}^2.$

3. be the filtering of instantaneous interference and last interference I when forming the average received interference power I that uses when SIR estimates.

I＝(1-α)I＂+α·I.

4. then, the estimation SIR ' of a SIR is calculated as E _bAnd the ratio between the I.

$\mathrm{SIR}\&prime;=\frac{E_b}{I}.$

5. then, last SIR estimates that SIR is calculated as

$\mathrm{SIR}=\mathrm{SIR}\&prime;-\frac{N_r}{N_s},$

Wherein, Nr is that footpath number and Ns are employed number of pilot symbols.

According to the present invention, use a kind of algorithm of having revised, it has considered that multipath disturbs and no matter the footpath number that is receiving and provide identical estimated accuracy.

By more real SIR (2) and estimation (6), visible multiplication factor D is

$D=1+\frac{N_r-1}{N_r}({\mathrm{\&beta;}}_{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C02829965E00252.png"\; state="\{\{state\}\}">c</figure-callout>}}^2+{\mathrm{\&beta;}}_d^2)G^2---\left(7\right),$

It makes the SIR estimated value have partially.This factor is formed by disturbing between additive noise and footpath.From the multiplying each other of (6) and (7), then:

$E\left\{{\mathrm{SIR}}_{\mathrm{proposed}}\right\}=\frac{S_c{\left({\mathrm{\&beta;}}_{c}G\right)}^2}{(1+\frac{N_r-1}{N_r}({\mathrm{\&beta;}}_{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C02829965E00252.png"\; state="\{\{state\}\}">c</figure-callout>}}^2+{\mathrm{\&beta;}}_d^2)G^2)}D=$

$=S_c{\left({\mathrm{\&beta;}}_{c}G\right)}^2.$

In other words, this proofreaies and correct the SIR estimation will be identical with (2), that is, it will be no inclined to one side.

In this proofreaied and correct, gain factor G had appearred ²But G ²Not known, therefore must estimate according to some mode.E _bBe defined as

$E_b={\left(S_c{\mathrm{\&beta;}}_{c}G\right)}^2+S_c\frac{N_r}{N_s}(1+\frac{N_r-1}{N_r}({\mathrm{\&beta;}}_{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C02829965E00252.png"\; state="\{\{state\}\}">c</figure-callout>}}^2+{\mathrm{\&beta;}}_d^2)G^2).---\left(8\right)$

By separating (8), obtain

${\mathrm{<figure-callout\; id="2"\; label="G"\; filenames="C02829965E00252.png"\; state="\{\{state\}\}">G</figure-callout>}}^2=\frac{E_b-S_c\frac{N_r}{N_s}}{({\left(S_c{\mathrm{\&beta;}}_c\right)}^2+\frac{S_c(N_r-1)}{N_s}({\mathrm{\&beta;}}_{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C02829965E00252.png"\; state="\{\{state\}\}">c</figure-callout>}}^2+{\mathrm{\&beta;}}_d^2))}---\left(9\right)$

Because E _bBe the parameter that calculates, and Sc, Nr and Ns be known constant, the unique unknown parameter in (9) is gain factor β _cAnd β _dWhen transport-format combination indicator (TFCI) is decoded (referring to 3GGP, TS 25.212), that is, after first frame in each time transmission interval (TTI), these gain factors are known.This means for first frame among each TTI and can not correctly calculate correction term (7).A method handling this problem is to use known β recently simply _cAnd β _dRight, and this further analyzes below.

Because unknown β _cAnd β _dSo, reduced performance, and used known β recently _cAnd β _dTo causing the incorrect compensation of first frame among each TTI, still for other frame among the TTI, correction term will be used correct β in (7) _cAnd β _dValue.This illustrates in Fig. 3.

Definition

For being used for the ratio in first frame of new TTI, Ratio for all the other frames uses among the TTI.For the proposed algorithm in first frame of each TTI, the reduction amount depends primarily on known β recently _cAnd β _dValue and new β _cAnd β _dDifference between the value.Usually, β _cAnd β _dBetween ratio in the scope of 1/15-1, but go up different spreading factors for Dedicated Physical Data Channel (DPDCH), in fact the scope of Shi Yonging is 4/15,5/15 ..., in 10/15 the scope.By using (7) and (9), the present invention who represents with dB does not have the error e between the SIR of real and estimation of inclined to one side algorithm _NewFor:

$e_{\mathrm{new}}=10{\log }_{10}(1+\frac{N_r-1}{N_r}({\mathrm{\&beta;}}_{c,\mathrm{old}}^2+{\mathrm{\&beta;}}_{d,\mathrm{old}}^2)G_{\mathrm{old}}^2)-10{\log }_{10}(1+\frac{N_r-1}{N_r}({\mathrm{\&beta;}}_{c,\mathrm{new}}^2+{\mathrm{\&beta;}}_{d,\mathrm{new}}^2)G_{\mathrm{new}}^2)$

Error e between the SIR that the real of inclined to one side algorithm is arranged at present and estimate _OldFor:

$e_{\mathrm{old}}=10{\log }_{10}(1+\frac{N_r-1}{N_r}({\mathrm{\&beta;}}_{c,\mathrm{new}}^2+{\mathrm{\&beta;}}_{d,\mathrm{new}}^2)G_{\mathrm{new}}^2)$

Fig. 4 shows the error e between the SIR of real SIR and estimation _NewAnd e _Old, work as β _cAnd β _dBetween ratio when changing, error e _NewAnd e _OldIn first frame that is introduced among the new TTI.Being unit with dB shows real SIR and the SIR error between estimating along Y-axis.Work as e _NewAnd e _OldFor just and occur the worst case of two methods when having maximum value.In this case, SIR is underestimated and will generate unnecessary power increases order.Absolute value in these positive errors is big more, and it is many more that the power that then sends increases order.Work as β _cAnd β _dBetween ratio change at 4/15 o'clock from 10/15 this worst case take place.As what from Fig. 4, can see,, there is not the error e of inclined to one side algorithm for this situation _NewLess than the error e that inclined to one side algorithm is arranged _Old

Work as e _NewAnd e _OldWhen negative, for example resemble and working as β _cAnd β _dChange under 10/15 o'clock the situation like that from 4/15, e can occur _NewAbsolute value greater than e _OldAbsolute value., negative error means that SIR is estimated by height, therefore will send power and reduce order.Because the normal working point of UE greatly about 5-10dB, and exceed 12dB the SIR distortion estimator takes place, UE will reduce its power in any case, so SIR over-evaluates the power that is generated and reduces to order and will not have any harm.

In Fig. 4, can find out, for worst case $\frac{{\mathrm{\&beta;}}_{c,\mathrm{old}}}{{\mathrm{\&beta;}}_{d,\mathrm{old}}}=10/15$ With $\frac{{\mathrm{\&beta;}}_{c,\mathrm{new}}}{{\mathrm{\&beta;}}_{d,\mathrm{new}}}=4/15,$ For no inclined to one side algorithm of the present invention, the error e in first frame of TTI _NewGreatly about 1.7dB; For current inclined to one side algorithm, e arranged _OldGreatly about 2.3dB., TTI this means for all the other frames among the TTI that usually greater than a frame period error of institute's suggesting method will be zero, and the error of current method will keep identical for all frames among the TTI.

Simulation result

Current SIR algorithm for estimating and according to the accuracy of SIR algorithm for estimating of the present invention by emulation.Two different propagation channels of emulation, first is a footpath flat fading channel, and second be four footpath fading channels.

In emulation, suppose gain factor β _cAnd β _dVery easily obtain.The influence of the unknown gain factor in first frame of each TTI is analyzed in the above.One footpath of SIR algorithm for estimating and the simulation result in four footpaths are as shown in Figure 5.Owing to disturb between the footpath (IPI), can see undoubtedly that for the sir value that exceeds 12dB the SIR of current algorithm is underestimated.

The present invention revises current algorithm thus, also provides a no inclined to one side SIR under this modification even the situation when SIR exceeds 12dB and estimates.

In a word, for example resemble at US 6,034, the SIR algorithm for estimating of the current use in 952 does not consider to disturb between the footpath (IPI), and this may cause sending to the unnecessary power of travelling carriage increases order, and this will introduce the number of users in more interference and the restriction system.By in SIR estimates, introducing correction factor, even also can realize Linear Estimation under the situation when SIR exceeds 12dB.No matter how many footpaths receiver uses, this SIR algorithm for estimating all provides identical result; Identical result means identical estimated accuracy or real SIR and estimates identical difference between the SIR.

Utilize no inclined to one side SIR method of estimation, the transmit power controlling method in the wireless communication system comprises the steps:

Transmitting power in controlling transmitter according to the correction sir value that calculates;

Calculate the correction sir value in the radio communication system base station, give mobile comm unit based on proofreading and correct sir value transmit power command signal, described mobile comm unit is positioned at the base station respective range and comprises transmitter, and the transmitting power of this transmitter is by described power command signal controlling.

For the no inclined to one side SIR method of estimation in the receiver of radio communication, described receiver comprises: be used to receive the device that transmits, the device that is used for estimated signal energy and received signal interference value, be used for calculating the device that a SIR estimates according to estimated signals energy and interference value, being used for proofreading and correct first by correction function estimates that sir value is non-linear and obtains to proofread and correct the device of sir value thus, the device that wherein is used to obtain to proofread and correct sir value is arranged in when considering to disturb between the path proofreaies and correct sir value according to the double counting of received signal sample, and no matter what of the footpath number that occurs in the receiver provide identical estimated accuracy.Be used to obtain the device of proofreading and correct sir value can be arranged to calculate by be used to proofread and correct first estimate that the device of sir value provides first estimate sir value and the multiplication factor D that provides by formula (7) between product.First estimates that sir value is provided by formula (6).Preferably, receiver also is included as even the sir value that is higher than 12dB provides the device of linearity correction sir value.Preferably, receiver first frame of also being included as time transmission interval (TTI) uses nearest known β _cAnd β _dRight device and be that other frame uses correct β in the W-CDMA system _cAnd β _dThe device of value.

The wireless communication system that is used for signal communication between at least two receivers, comprise aforesaid at least one receiver, at least one base station, described at least one base station is equipped with described at least one receiver and at least one transmitter, and this transmitter is used for the transmit power command signal and gives the mobile comm unit that is positioned at the base station respective range.

Mobile comm unit comprise the received power command signal receiver and, with transmitter by the power level signal of communication of the power command signal controlling of estimating based on no inclined to one side SIR.

The derivation of formula (6)

Use from start to finish as giving a definition in this section.

$w_k\&prime;\left(i\right)=\underset{m}{\mathrm{\&Sigma;}}w\left(m\right)c^{*}(m-{\mathrm{\&tau;}}_k),$

w(m)＝w _re(m)+jw _im(m)，

$w_{\mathrm{re}}\left(m\right)\mathrm{and}{w}_{\mathrm{im}}\left(m\right)\&Element;N(0,\frac{1}{\sqrt{2}}),$

Subscript k represents the k footpath,

τ _kBe the time-delay in k footpath,

α (k) is the channel coefficients in k footpath,

C _d(m) be the channel code of DPDCH,

C is a scrambler, C ^*Be the complex conjugate of scrambler,

S _cBe the spreading factor of control channel (=256),

Nr is the number of Rake fingers that is used for the work of Rake receiver,

G is the gain factor of power control,

β _cAnd β _dBe arranged on the gain factor of power ratio between Dedicated Physical Control Channel (DPCCH) and the Dedicated Physical Data Channel (DPDCH).

Each symbol is made up of three independent parts: disturb (IPI) and additive white noise between desired signal, footpath.The desired value of first and variance are provided by following:

E{jα(k)β _cGS _c}＝jα(k)β _cGS _c，

Var{j α (k) β _cGS _c}=[constant variance]=0. (A.1)

Definition z _k(i) as the IPI of k footpath and symbol i:

$z_k\left(i\right)=\underset{m}{\mathrm{\&Sigma;}}\underset{\stackrel{n=1}{n\&NotEqual;k}}{\overset{N_r}{\mathrm{\&Sigma;}}}\mathrm{\&alpha;}\left(n\right)({\mathrm{j\&beta;}}_c+{\mathrm{\&beta;}}_d{C}_d\left(m\right))\mathrm{Gc}(m-{\mathrm{\&tau;}}_n)c^{*}(m-{\mathrm{\&tau;}}_k)$

Product v (m)=c (m-τ _n) c ^*(m-τ _k) and v ' (m)=C _d(m) c (m-τ _n) c ^*(m-τ _k) adopt have equal probability 1/4 can only value 1 ,-1 ,-j, j.V (m) and v ' desired value and variance (m) is calculated as:

$E\left\{v\left(m\right)\right\}=E\{v\&prime;\left(m\right)\}=\frac{1}{4}(1+(-1)+j+(-j))=0,$

$\mathrm{Var}\left\{v\left(m\right)\right\}=\mathrm{Var}\{v\&prime;\left(m\right)\}=\frac{1}{4}(1^2+{(-1)}^2+j\&CenterDot;-j+(-j)\&CenterDot;j)=1.---(A.2)$

Product v (m) and v ' are independently (m).By using (A.2), z _k(i) desired value and variance are calculated as:

$E\left\{z_k\left(i\right)\right\}=E\left\{\underset{m}{\mathrm{\&Sigma;}}\underset{\stackrel{n=1}{n\&NotEqual;k}}{\overset{N_r}{\mathrm{\&Sigma;}}}\mathrm{\&alpha;}\left(n\right)({\mathrm{j\&beta;}}_c\mathrm{Gv}\left(m\right)+{\mathrm{\&beta;}}_d\mathrm{Gv}\&prime;\left(m\right))\right\}$

$=\underset{m}{\mathrm{\&Sigma;}}\underset{\stackrel{n=1}{n\&NotEqual;k}}{\overset{N_r}{\mathrm{\&Sigma;}}}\left(\mathrm{\&alpha;}\left(n\right)({\mathrm{j\&beta;}}_c\mathrm{GE}\left\{v\left(m\right)\right\}+{\mathrm{\&beta;}}_d\mathrm{GE}\{v\&prime;\left(m\right)\})\right)=0$

$\mathrm{Var}\left\{z_k\left(i\right)\right\}=E\left\{z_k\left(i\right)z_k^{*}\left(i\right)\right\}$

$=\underset{m}{\mathrm{\&Sigma;}}\underset{\stackrel{n=1}{n\&NotEqual;k}}{\overset{N_r}{\mathrm{\&Sigma;}}}\left(\mathrm{\&alpha;}\left(n\right)({\mathrm{j\&beta;}}_c\mathrm{GE}\left\{v\left(m\right)\right\}+{\mathrm{\&beta;}}_d\mathrm{GE}\{v\&prime;\left(m\right)\})\right){\left(\mathrm{\&alpha;}\left(n\right)({\mathrm{j\&beta;}}_c\mathrm{GE}\left\{v\left(m\right)\right\}+{\mathrm{\&beta;}}_d\mathrm{GE}\{v\&prime;\left(m\right)\})\right)}^{*}$

$=\underset{\stackrel{n=1}{n\&NotEqual;k}}{\overset{N_r}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}^2\left(n\right)({\mathrm{\&beta;}}_c^2{G}^2{S}_{c}E\left\{v\left(m\right)v^{*}\left(m\right)\right\}+{\mathrm{\&beta;}}_d^2{G}^2{S}_{c}E\{v\&prime;\left(m\right){v\&prime;}^{*}\left(m\right)\})$

$=\underset{\stackrel{n=1}{n\&NotEqual;k}}{\overset{N_r}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}^2\left(n\right)({\mathrm{\&beta;}}_{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C02829965E00252.png"\; state="\{\{state\}\}">c</figure-callout>}}^2+{\mathrm{\&beta;}}_d^2)G^2{S}_c.---(A.3)$

The desired value of noise item and variance are provided by following:

$=\underset{m}{\mathrm{\&Sigma;}}E\left\{w\left(m\right)\right\}E\left\{c^{*}(m-{\mathrm{\&tau;}}_k)\right\}=0$

$\mathrm{Var}\left\{{w\&prime;}_k\left(i\right)\right\}=\underset{m}{\mathrm{\&Sigma;}}E\left\{\left(w\left(m\right)c^{*}(m-{\mathrm{\&tau;}}_k)\right){\left(w\left(m\right)c^{*}(m-{\mathrm{\&tau;}}_k)\right)}^{*}\right\}$

$=\underset{\mathrm{<figure-callout\; id="1"\; label="m"\; filenames="C02829965E00252.png"\; state="\{\{state\}\}">m</figure-callout>}}{\mathrm{\&Sigma;}}1=S_c.---(A.4)$

Can calculate despread symbols p by (A.1), (A.3) and (A.4) _k(i) desired value and variance.

E{p _k(i)}＝jα(k)GS _c

$\mathrm{Var}\left\{p_k\left(i\right)\right\}=({\mathrm{\&beta;}}_{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C02829965E00252.png"\; state="\{\{state\}\}">c</figure-callout>}}^2+{\mathrm{\&beta;}}_d^2)G^2{S}_c\underset{\stackrel{n=1}{n\&NotEqual;k}}{\overset{N_r}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}^2\left(n\right)+S_c.---(A.5)$

SIR estimates based on (3), (4) and (5).

The desired value that SIR estimates is provided by following:

$E\left\{{\mathrm{SIR}}_{\mathrm{est}}\right\}=E\{\frac{E_b}{I}-\frac{N_r}{N_s}\}$

$=\frac{E\left\{E_b\right\}}{E\left\{I\right\}}-\frac{N_r}{N_s}.---(A.6)$

By using (4), E{E _bDesired value provide by following:

$E\left\{E_b\right\}=E\left\{\underset{k=1}{\overset{N_r}{\mathrm{\&Sigma;}}}S\left(k\right)S^{*}\left(k\right)\right\}$

$=\frac{1}{N_s^2}\underset{k=1}{\overset{N_r}{\mathrm{\&Sigma;}}}E\left\{\left(\underset{i=1}{\overset{N_s}{\mathrm{\&Sigma;}}}{p}_k\left(i\right)\right){\left(\underset{u=1}{\overset{N_s}{\mathrm{\&Sigma;}}}{p}_k\left(u\right)\right)}^{*}\right\}$

$=\frac{1}{N_s^2}\underset{k=1}{\overset{N_r}{\mathrm{\&Sigma;}}}E\left\{\left(\underset{i=1}{\overset{N_s}{\mathrm{\&Sigma;}}}(\mathrm{\&alpha;}\left(k\right){\mathrm{\&beta;}}_c{\mathrm{GS}}_c+\underset{\stackrel{n=1}{n\&NotEqual;k}}{\overset{N_r}{\mathrm{\&Sigma;}}}{z}_k\left(i\right)+w_k^{\&prime;}\left(i\right))\right){\left(\underset{u=1}{\overset{N_s}{\mathrm{\&Sigma;}}}(\mathrm{\&alpha;}\left(k\right){\mathrm{\&beta;}}_c{\mathrm{GS}}_c+\underset{\stackrel{n=1}{n\&NotEqual;k}}{\overset{N_r}{\mathrm{\&Sigma;}}}{z}_k\left(u\right)+w_k^{\&prime;}\left(u\right))\right)}^{*}\right\}$

$=\frac{1}{N_s^2}\underset{k=1}{\overset{N_r}{\mathrm{\&Sigma;}}}E\{N_s^2{\left(\mathrm{\&alpha;}\left(k\right){\mathrm{\&beta;}}_c{\mathrm{GS}}_c\right)}^2+\underset{i=1}{\overset{N_s}{\mathrm{\&Sigma;}}}\left(\underset{\stackrel{n=1}{n\&NotEqual;k}}{\overset{N_r}{\mathrm{\&Sigma;}}}{z}_k\left(i\right)\right)\underset{u=1}{\overset{N_s}{\mathrm{\&Sigma;}}}{\left(\underset{\stackrel{n=1}{n\&NotEqual;k}}{\overset{N_r}{\mathrm{\&Sigma;}}}{z}_k\left(u\right)\right)}^{*}+\underset{i=1}{\overset{N_s}{\mathrm{\&Sigma;}}}\left(w_k^i\left(u\right)\right)\underset{u=1}{\overset{N_s}{\mathrm{\&Sigma;}}}{\left(w_k^i\left(u\right)\right)}^{*}\}$

$=\frac{1}{N_s^2}\underset{k=1}{\overset{N_r}{\mathrm{\&Sigma;}}}({\left(N_s\mathrm{\&alpha;}\left(k\right){\mathrm{\&beta;}}_c{\mathrm{GS}}_c\right)}^2+N_s({\mathrm{\&beta;}}_{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C02829965E00252.png"\; state="\{\{state\}\}">c</figure-callout>}}^2+{\mathrm{\&beta;}}_d^2)G^2{S}_c\underset{\stackrel{n=1}{n\&NotEqual;k}}{\overset{N_r}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}^2\left(n\right)+N_s{S}_c)$

$={\left({\mathrm{\&beta;}}_c{\mathrm{GS}}_c\right)}^2+\frac{N_r}{N_s}{S}_c(1+\frac{N_r-1}{N_r}({\mathrm{\&beta;}}_{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C02829965E00252.png"\; state="\{\{state\}\}">c</figure-callout>}}^2+{\mathrm{\&beta;}}_d^2)G^2).$

By using (5), desired value E{I} can obtain be:

$E\left\{I\right\}=\frac{1}{N_r}\underset{k=1}{\overset{N_r}{\mathrm{\&Sigma;}}}N\left(k\right)$

$=\frac{1}{N_r}\underset{k=1}{\overset{N_r}{\mathrm{\&Sigma;}}}\mathrm{Var}\left\{p_k\left(i\right)\right\}$

$=\frac{1}{N_r}\underset{k=1}{\overset{N_r}{\mathrm{\&Sigma;}}}(({\mathrm{\&beta;}}_{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C02829965E00252.png"\; state="\{\{state\}\}">c</figure-callout>}}^2+{\mathrm{\&beta;}}_d^2)G^2{S}_c\underset{\stackrel{n=1}{n\&NotEqual;k}}{\overset{N_r}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}^2\left(n\right)+S_c)$

$=S_c(1+\frac{N_r-1}{N_r}({\mathrm{\&beta;}}_{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C02829965E00252.png"\; state="\{\{state\}\}">c</figure-callout>}}^2+{\mathrm{\&beta;}}_d^2)G^2)$

At last, (A.6) is:

$E\left\{{\mathrm{SIR}}_{\mathrm{est}}\right\}=\frac{{\left({\mathrm{\&beta;}}_c{\mathrm{GS}}_c\right)}^2+\frac{N_r}{N_s}{S}_c(1+\frac{N_r-1}{N_r}({\mathrm{\&beta;}}_{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C02829965E00252.png"\; state="\{\{state\}\}">c</figure-callout>}}^2+{\mathrm{\&beta;}}_d^2)G^2)}{S_c(1+\frac{N_r-1}{N_r}({\mathrm{\&beta;}}_{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C02829965E00252.png"\; state="\{\{state\}\}">c</figure-callout>}}^2+{\mathrm{\&beta;}}_d^2)G^2)}-\frac{N_r}{N_s}=\frac{S_c{\left({\mathrm{\&beta;}}_{c}G\right)}^2}{(1+\frac{N_r-1}{N_r}({\mathrm{\&beta;}}_{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="C02829965E00252.png"\; state="\{\{state\}\}">c</figure-callout>}}^2+{\mathrm{\&beta;}}_d^2)G^2)}$

The present invention has been described in conjunction with the preferred embodiments.Clearly, consider foregoing description, a lot of selections, modification, variation and use will be conspicuous for a person skilled in the art.

Claims (17)

1. no inclined to one side signal interference ratio (SIR) estimation approach is provided in the receiver of a wireless communication system, it is characterized in that, comprise the steps:

Reception transmits,

The signal energy of estimating received signal and the interference value of received signal,

Calculate SIR estimation based on estimated signals energy and interference value,

Estimate that by double counting first product between sir value and the multiplication factor (D) obtains the correction sir value,

When considering to disturb between the footpath, proofread and correct sir value according to the sample double counting of received signal, thus with receiver in the footpath number that occurs irrespectively obtain identical estimated accuracy.

2. according to the method for claim 1, it is characterized in that, according to the described multiplication factor of footpath number double counting that occurs in the receiver.

3. according to the method for claim 1, it is characterized in that, wherein multiplication factor

$D=1+\frac{N_r-1}{N_r}({\mathrm{\&beta;}}_c^2+{\mathrm{\&beta;}}_d^2)G^2$

In the following formula,

G is the gain factor of power control, G ²By $G^2=\frac{E_b-S_c\frac{N_r}{N_s}}{({\left(S_c{\mathrm{\&beta;}}_c\right)}^2+\frac{S_c(N_r-1)}{N_s}({\mathrm{\&beta;}}_c^2+{\mathrm{\&beta;}}_d^2))}$ Obtain

Ns is the pilot bits number that is used for estimating,

Nr is the number of Rake fingers that is used for Rake receiver,

E _bBe the received signal energy of each data bit,

Sc is the spreading factor of control channel,

β _cAnd β _dBe arranged on the gain factor of power ratio between Dedicated Physical Control Channel (DPCCH) and the Dedicated Physical Data Channel (DPDCH), and wherein first estimate that sir value is by as follows $E\left\{\mathrm{SIR}\right\}=\frac{S_c{\left({\mathrm{\&beta;}}_{c}G\right)}^2}{(1+\frac{N_r-1}{N_r}({\mathrm{\&beta;}}_c^2+{\mathrm{\&beta;}}_d^2)G^2)}$ Provide.

4. according to the method for claim 1, it is characterized in that, further comprise, in addition the sir value that is higher than 12dB the linearity correction sir value is provided.

5. according to the method for claim 1, it is characterized in that described wireless communication system is a W-CDMA system.

6. according to the method for claim 3, it is characterized in that nearest known β _cAnd β _dTo being used for first frame of time transmission interval (TTI), correct β _cAnd β _dValue is used for other frame.

7. the transmit power controlling method in the wireless communication system is characterized in that, comprising: according to the method calculation correction sir value that defines in aforementioned any claim, according to proofreading and correct the transmitting power of sir value in controlling transmitter.

8. according to the method for claim 7, it is characterized in that, further comprise:

Correction sir value in the base station of calculating wireless communication system, give mobile comm unit based on proofreading and correct sir value transmit power command signal, described mobile comm unit is positioned at the base station respective range and comprises the transmitter of transmitting power by described power command signal controlling.

9. receiver that in communication system, uses, comprise: be used to receive the device that transmits, the device that is used for the interference value of the signal energy of estimating received signal and received signal, be used for calculating the device that a SIR estimates based on estimated signals energy and interference value, it is characterized in that, described receiver also comprises: be used for estimating that by double counting first product between sir value and the multiplication factor (D) obtains to proofread and correct the device of sir value, the device that wherein is used to obtain to proofread and correct sir value is arranged in when considering to disturb between the footpath proofreaies and correct sir value according to the double counting of received signal sample, and with receiver in the footpath number that occurs irrespectively provide identical estimated accuracy.

10. receiver according to claim 9 is characterized in that, described multiplication factor is according to the footpath number double counting that occurs in the receiver.

11. receiver according to claim 9 is characterized in that, the described device that is used to obtain the sir value of having proofreaied and correct be arranged to calculate by be used to proofread and correct first estimate that the device of sir value provides first estimate sir value and by $D=1+\frac{N_r-1}{N_r}({\mathrm{\&beta;}}_c^2+{\mathrm{\&beta;}}_d^2)G^2$ Product between the multiplication factor D that provides obtains described correction sir value, wherein

G is the gain factor of power control, G ²By $G^2=\frac{E_b-S_c\frac{N_r}{N_s}}{({\left(S_c{\mathrm{\&beta;}}_c\right)}^2+\frac{S_c(N_r-1)}{N_s}({\mathrm{\&beta;}}_c^2+{\mathrm{\&beta;}}_d^2))}$ Obtain

Ns is the pilot bits number that is used for estimating,

Nr is the number of Rake fingers that is used for Rake receiver,

E _bBe the received signal energy of each data bit,

Sc is the spreading factor of control channel,

β _cAnd β _dBe arranged on the gain factor of power ratio between Dedicated Physical Control Channel (DPCCH) and the Dedicated Physical Data Channel (DPDCH), and wherein first estimate that sir value is by as follows $E\left\{\mathrm{SIR}\right\}=\frac{S_c{\left({\mathrm{\&beta;}}_{c}G\right)}^2}{(1+\frac{N_r-1}{N_r}({\mathrm{\&beta;}}_c^2+{\mathrm{\&beta;}}_d^2)G^2)}$ Provide.

12. receiver according to claim 9 is characterized in that, described receiver also is included as even the sir value that is higher than 12dB provides the device of linearity correction sir value.

13. the receiver according to claim 9 is characterized in that, described communication system is the W-CDMA system.

14. the receiver according to claim 11 is characterized in that, described receiver comprises that first frame that is used for for time transmission interval (TTI) uses nearest known β _cAnd β _dRight device, and be used for using correct β for other frame _cAnd β _dThe device of value.

15. a wireless communication system that is used for the signal communication between at least two receivers is characterized in that, comprises at least one receiver of being asked in any one as claim 9-14.

16. described system according to claim 15, it is characterized in that, also comprise at least one base station, described base station is equipped with at least one described receiver and at least one transmitter, and this transmitter is used for the transmit power command signal and gives the mobile comm unit that is positioned at the base station respective range.

17. the mobile comm unit of a use in wireless communication system as claimed in claim 16, it is characterized in that, comprise the receiver that is used for the received power command signal, with, be used for transmitter by the power level signal of communication of the power command signal controlling of estimating based on no inclined to one side SIR.

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