CN1138365C - Signal/interference ratio (SIR) measuring method - Google Patents

Signal/interference ratio (SIR) measuring method Download PDF

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Publication number
CN1138365C
CN1138365C CNB011003642A CN01100364A CN1138365C CN 1138365 C CN1138365 C CN 1138365C CN B011003642 A CNB011003642 A CN B011003642A CN 01100364 A CN01100364 A CN 01100364A CN 1138365 C CN1138365 C CN 1138365C
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channel
pilot
signal
dpch
common pilot
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CN1362800A (en
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郑志彬
任锋
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The present invention discloses a signal /interference ratio (SIR) measuring method of a CDMA system with common pilot channels, which comprises: the common pilot channels are spread according to the size of a spreading factor of a dedicated physical channel; channel estimation are carried out according to the spread public pilot symbols and known public pilot symbols; channel compensation are carried out for the interrupted pilot symbols of the dedicated physical channel according to the obtained channel estimation values of the public pilot symbols to realize SIR measurement. The present invention enhances SIR measuring accuracy, achieves accurate power control effects and simultaneously simplifies a control mechanism for hardware realization by realizing a different applied channel estimation control mechanism on a CPICH receiving module.

Description

Signal-to-jamming ratio (SIR) method of measurement
The present invention relates to the power control techniques field of code division multiple access (CDMA) mobile communication system, relate in particular to a kind of signal-to-jamming ratio (SIR) method of measurement that is applied to have the CDMA mobile communication system of Common Pilot Channel.
Power control techniques is the key technology of CDMA mobile communication system, its objective is in order to overcome near-far interference, makes system can keep high quality communication, other user who takies same channel is not produced unnecessary interference again.Wherein, signal-to-jamming ratio (SIR:Signal Interference Ratio) measuring technique is the core of power control.Signal-to-jamming ratio (SIR) is mainly used in aspects such as power control, soft handover and Cell searching, for the normal operation of system provides in good time effectively signal interference ratio information.Therefore, the whether accurate of sir measurement will directly influence the quality of power control performance, thereby influence the capacity of sub-district, influence the overall performance of mobile communication system.
In 3-G (Generation Three mobile communication system), the control data of down link and business datum are to transmit by DPCH, its form provides time-multiplexed pilot (Pilot) symbol as shown in Figure 1 on DPCH (DPCH), be in order to realize control function of power.Down link also provides a Common Pilot Channel (CPICH) specially in addition, is used for the channel estimating of DPCH.The spreading factor of DPCH is unfixing, can be 4,8,16,32,64,128,256 and 512, and the spreading factor of Common Pilot Channel is fixed as 256, comprises 10 common pilot symbols in each time slot.
In the tradition receiving system, the continuous pilot symbol of Common Pilot Channel transmission is used for business datum Datal, the Data2 of auxiliary DPCH transmission and channel estimating and the compensation of control data TPC, TFCI etc., the time-multiplexed pilot symbol Pilot of DPCH (DPCH) then is used for sir measurement, realizes control function of power.The channel estimating of demodulation Pilot is obtained by Pilot itself, referring to shown in Figure 2, is the sir measurement signal of traditional receiving system, and its realization is described below:
The chip signal of the DPCH transmission that 1) receives is divided into two parts through after the despreading: a part is control data TPC, TFCI and business datum Data1, Data2; Another part is pilot data Pilot.
2) the pilot data Pilot after the despreading at first carries out channel estimating, channel estimating obtains by original pilots symbol and reception frequency pilot sign conjugation, for reducing noise effect, also carried out the smoothing processing of the instantaneous channel estimating of all frequency pilot signs, the value after the smoothing processing is as the channel estimation value of all frequency pilot signs in the time slot.
3) channel estimation value and reception frequency pilot sign conjugate multiplication realize channel compensation, carry out the phase place rotation then, make that the frequency pilot sign Pilot in the time slot rotates to same fixed phase axle.。
4) the time-multiplexed pilot symbol Pilot that has forwarded same fixed phase axle to forms one-channel signal after high specific merges.
5) at the signal after merging, record signal power S and interference power I respectively, being divided by by divider to obtain the measured value of SIR.
Traditional sir measurement mainly is that the time-multiplexed pilot symbol pilot by DPCH carries out channel estimating, finishes channel compensation, merges through addition to record signal energy and interfering energy, thereby obtains the measurement result of SIR.Yet, because the transmitting power of DPCH signal will be lower than the transmitting power of Common Pilot Channel signal, therefore the accuracy of the channel estimation results by time-multiplexed pilot symbol gained will be lower than the channel estimation results by the continuous pilot symbol gained of Common Pilot Channel, cause the measurement of SIR to have deviation, influence the performance of power control.
Simultaneously, need in this traditional receiving system implementing two cover channel estimating apparatus on Common Pilot Channel and the DPCH, this will cause hard-wired complicated.And have the hysteresis quality of time owing to be used for the channel estimating of business datum, do not satisfy the real-time requirement of sir measurement, the channel estimating of Pilot can not adopt same set of channel estimating apparatus with business datum.
Given this, purpose of the present invention just is to provide a kind of sir measurement method that is applied to have the cdma system of Common Pilot Channel, and it can simplify the hardware realization mechanism, improves the certainty of measurement of SIR.
The present invention is a kind of to be applied to have the sir measurement method of the cdma system of Common Pilot Channel, be at receiving terminal, Common Pilot Channel is carried out despreading according to the spreading factor size of DPCH, and the common pilot symbols that obtains according to this despreading and known common pilot symbols are carried out channel estimating, with the channel estimation value that obtains according to common pilot symbols the time-multiplexed pilot symbol of DPCH is carried out channel compensation, thereby realize sir measurement.
The technique scheme according to the present invention further comprises following concrete steps:
The chip signal of the DPCH transmission that 1) receives is divided into control and business datum symbol, frequency pilot sign two parts through after the despreading;
2) Common Pilot Channel is carried out despreading according to the spreading factor size of DPCH; And the common pilot symbols that obtains according to this despreading and known common pilot symbols carry out channel estimating, obtains channel estimation value;
3) channel estimation value to obtain with the corresponding common pilot symbols of the time-multiplexed pilot symbol of DPCH carries out channel compensation to the time-multiplexed pilot symbol of DPCH;
4) frequency pilot sign to gained carries out the phase place rotation, makes frequency pilot sign be on the same fixed phase;
5) above-mentioned frequency pilot sign is carried out multipath and merge measured signal power and interference power;
6) signal power and interference power are divided by, obtain the sir measurement value.
Be to reduce noise effect, above-mentioned step 2) carry out after channel estimating obtains channel estimation value, also carry out the smoothing processing of the instantaneous channel estimating of all frequency pilot signs.
What the present invention is directed to the common pilot symbols transmission is the characteristics of complete " 1 " symbol, provide a kind of based on the common pilot symbols channel estimating testing mechanism that becomes spreading factor, the frequency pilot sign channel errors of compensation DPCH, thereby the realization sir measurement can reach more accurate power controls effect under certain conditions.Must on DPCH and CPICH, implement two cover channel estimating controlling mechanisms respectively when having avoided hardware to realize simultaneously, and only on CPICH, implement a cover controlling mechanism, simplify the hardware implementation procedure.
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Fig. 1 is the data format signal of Common Pilot Channel (CPICH) and DPCH (DPCH).
Fig. 2 is that traditional sir measurement method is implemented figure.
Fig. 3 is a sir measurement method schematic diagram of the present invention.
The present invention mainly is that the frequency pilot sign Pilot at DPCH has proposed a kind of new channel estimation methods, to improve the precision of sir measurement.The received signal processing procedure that is used for business datum Datal, Data2 and control data TPC, TFCI after the DPCH despreading in the data is the same with conventional method, and the channel estimating that is used for the frequency pilot sign Pilot of DPCH will be realized by CPICH, and its implementation method is described as follows referring to shown in Figure 3:
The spreading factor of supposing DPCH is sf1, and the chip level data that receive the DPCH signal at L time slot are that (L, k), the local spread-spectrum signal that is used for carrying out with the DPCH signal relevant despreading is m to d d(L, k), the frequency pilot sign that this locality prestores be Pilot (L, i).The chip level public guide frequency data that receive in Common Pilot Channel are d p(L, k), the local spread-spectrum signal that is used for carrying out with common pilot signal relevant despreading is m p(L, k).
1) signal of DPCH is through after the despreading, and receive data and be divided into two parts: a part is control data TPC, TFCI and business datum Data1, Data2, and the processing of this part is the same with conventional method; Another part is pilot data Pilot.The DPCH signal after despreading, obtain received signal symbol D (L, i): D ( L , i ) = Σ k = 1 sfl d ( L , i , k ) * m d ( L , i , k ) I represents i symbol of this time slot, and the frequency pilot sign of reception is D Pilot(L, i).
2) Common Pilot Channel is carried out despreading according to the spreading factor size of DPCH, if promptly the spreading factor of Common Pilot Channel be DPCH spreading factor n doubly, then the common pilot symbols that obtains in a time slot this moment is 10 * n.Obtain received signal symbol D after the spreading factor despreading of common pilot signal according to Traffic Channel p(L, i): D p ( L , i ) = Σ k = 1 sf 1 d p ( L , i , k ) * m p ( L , i , k ) D p(L, i) expression and the corresponding reception common pilot symbols of i symbol of Traffic Channel.
3) common pilot symbols that obtains of despreading and known common pilot symbols 1-j carry out channel estimation process, obtain corresponding channel estimation value.The channel estimation value of i frequency pilot sign is
ξ p(L，i)＝D p(L，i)*(l-j)
4) channel estimation value that obtains with common pilot symbols carries out the channel fading compensation to the time-multiplexed pilot symbol on the corresponding DPCH, obtains D p ′ ( L , i ) = D p ( L , i ) * ξ p * ( L , i ) ξ p *(L i) is ξ p(L, conjugate i).
5) for carrying out sir measurement, receive time-multiplexed pilot symbol D accordingly p' (L i) must carry out the phase place rotation, so that the time-multiplexed pilot symbol D of the sir measurement that is useful on p(L i) is in identical fixed phase, and the known time-multiplexed pilot symbol of frequency pilot sign that obtains and reservation carries out conjugate multiplication and realizes the phase place rotation:
6) time-multiplexed pilot symbol D p(L, i) after high specific merges, measured signal power S and interference power I; S = ( 1 N p Σ i = 1 N p Σ j = 1 l D p ( L , i , j ) ) 2 I = 1 N p Σ i = 1 N P ( Σ j = 1 1 D p ( L , i , j ) ) 2 - ( 1 N p Σ i = 1 N p Σ j = 1 1 D p ( L , i , j ) ) 2 Wherein subscript j represents j bar effective diameter, has 1 effective diameter, N pBe the time-multiplexed pilot symbolic number.
7) can obtain sir value at last: SIR = S I
For reducing noise effect, common pilot symbols that step 3 obtains despreading and known common pilot symbols 1-j carry out channel estimation process, after obtaining corresponding channel estimation value, also carried out the smoothing processing of the instantaneous channel estimating of all frequency pilot signs, the value after the smoothing processing is as the channel estimation value of all frequency pilot signs in the time slot.
From characteristics of the present invention as can be seen, the present invention has following effect:
1) the present invention has utilized the characteristics of common pilot symbols for complete " 1 ", can adopt with the different spreading factor of making a start and carry out despreading, makes channel estimation process very simple.
2) realization of the present invention system can utilize original CPICH despreading module, and does not need to increase extra despreading module.
3) the present invention has simplified hard-wired controlling mechanism, and making only needs to realize the channel estimating control module of different application on the CPICH receiver module.
4) because the transmitting power of common pilot signal is higher than the transmitting power of DPCH signal, when channel circumstance better or Traffic Channel gain when high, sir measurement value of the present invention may be better than the sir measurement value of conventional method.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, the present invention is the method despreading continuous pilot symbol that becomes spreading factor by adopting, promptly adopt and carry out despreading with the change spreading factor of making a start different in Common Pilot Channel, realized character rate coupling with DPCH, thereby the channel estimation value direct compensation that can adopt the continuous pilot symbol is used to measure the time-multiplexed pilot symbol of SIR business control channel, improve the certainty of measurement of SIR, simplified the hardware realization mechanism of system simultaneously.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.

Claims (2)

1, a kind of signal/interference ratio measuring method that is applied to have the cdma system of Common Pilot Channel is characterized in that this method comprises at least:
The chip signal of the DPCH transmission that despreading receives, controlled and business datum, frequency pilot sign two parts;
Common Pilot Channel is carried out despreading according to the spreading factor size of DPCH, obtain common pilot symbols;
Common pilot symbols that obtains according to this despreading and known common pilot symbols are carried out channel estimating;
With the channel estimation value that obtains with the corresponding common pilot symbols of the time-multiplexed pilot symbol of DPCH, the time-multiplexed pilot symbol of DPCH is carried out channel compensation;
Frequency pilot sign after the compensation is carried out the phase place rotation, make frequency pilot sign be on the same fixed phase;
Above-mentioned frequency pilot sign is carried out multipath merge measured signal power and interference power;
Signal power and interference power are divided by, obtain the sir measurement value.
2, signal/interference ratio measuring method according to claim 1 is characterized in that obtaining further comprising after the channel estimation value step in the described channel estimating of carrying out:
Carry out the smoothing processing of the instantaneous channel estimating of all frequency pilot signs.
CNB011003642A 2001-01-02 2001-01-02 Signal/interference ratio (SIR) measuring method Expired - Fee Related CN1138365C (en)

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Publication number Priority date Publication date Assignee Title
CN100369400C (en) * 2003-02-20 2008-02-13 西南交通大学 Method of estimating interference ratio of blind signal of retransmitting data based on Hybrid automatic repeated request (HARQ)
CN100531015C (en) * 2003-06-25 2009-08-19 浙江华立通信集团有限公司 Method of proceeding SIR evaluation using control signal in CDMA receiver
CN100417277C (en) * 2004-09-30 2008-09-03 中兴通讯股份有限公司 SIR measuring method for broadband CDMA system uplink
CN101147417B (en) * 2005-03-24 2010-12-15 日本电气株式会社 Mobile terminal of CDMA system, mobile communication method of cdma system, and communication quality estimating method
CN101309239B (en) * 2005-09-13 2011-09-14 浙江华立通信集团有限公司 Estimation method of signal interference ratio of forward fundamental service channel in CDMA system of FDD mode
CN100433579C (en) * 2005-09-13 2008-11-12 浙江华立通信集团有限公司 Estimiting method of signal interference ratio of forward basic service channel in FDD mode CDMA system
CN1964237B (en) * 2005-11-09 2010-06-16 中兴通讯股份有限公司 An estimation method for SIR of high-speed physical downlink share channel
EP2129003A4 (en) * 2007-01-25 2015-01-14 Zte Corp Power control apparatus and method
CN101056122B (en) * 2007-06-06 2010-06-16 中兴通讯股份有限公司 A rake receiving implementation method and device of the pilot in the broadband code-division multi-address system
CN109302366B (en) * 2017-12-26 2023-02-07 上海创远仪器技术股份有限公司 WCDMA signal demodulation method suitable for signal analyzer platform

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