CN1225856C - Method and device for adjusting weight of downgoing emission under mode of closed loop emission diversity - Google Patents

Abstract

The present invention discloses a method for adjusting the weight of descending emission under a mode of closed loop emission diversity. The method is characterized in that firstly, a weight point decision function under closed loop emission diversity is set; an adjusting steplength 1 of weight corresponding to user equipment (U E) is obtained by calculating decision functions corresponding to each multipath demodulating result signal of a CPICH signal, feedback information (FBI) is determined according to a calculating result and required accuracy, and the FBI is output by an ascending channel; then, whether the weight adjustment enters a stable state or not is judged; if the weight adjustment enters the stable state, the decision function of the DPCH is calculated to obtain a weight adjusting steplength 2; else the adjusting steplength 2 of the weight corresponding to the UE is directly determined to be 0; finally, the total weight adjusting steplength is used for adjusting the weight corresponding to the UE. The proposal can obtain the stepping adjusting steplength of the descending emission weight of a system, and thus, contradiction between decision correct rate and expected gain can be solved so that UE can obtain an ideal receiving effect.

Description

The control method of the weight of downgoing emission under the closed loop transmit diversity modes and device

Technical field

The present invention relates to the control method and the device of the weight of downgoing emission under the closed loop transmit diversity modes in weights control method, particularly Wideband Code Division Multiple Access (WCDMA) (WCDMA) system under code division multiple access (CDMA) the system transmission diversity pattern.

Background technology

Because mobile communication environment exists serious multipath fading, this will influence the reliability of system information transmissions, and for addressing this problem, diversity technique has induced one at the receiver place.Because there is the restriction of aspects such as volume, price and battery capacity in travelling carriage, makes that the space diversity of many antennas is feasible hardly.If but wireless channel is approximate when being considered as modified line shape system, then can utilize the equivalent transformation of nonlinear system, be antenna (emission) diversity of transmitting terminal with antenna (reception) the diversity equivalence of receiving terminal.In WCDMA, in order to reduce the deleterious effects of FDD (Frequency Division Duplex, Frequency Division Duplexing (FDD)) for transmit diversity, general recommendations adopts close-loop control mode to realize transmit diversity.Two kinds of Closed-Loop Transmit Diversity have been defined among the WCDMA, i.e. closed loop transmit diversity modes 1 and pattern 2.

In the standard of 3G (Third Generation) Moblie cooperative association (3GPP), transmit diversity techniques is had following regulation: the general structure of the transmitter of support DPCH (DPCH, Dedicated Physical Channel) closed loop mode transmit diversity as shown in Figure 1.Chnnel coding among Fig. 1, interweave identical with spread spectrum with non-diversity mode.Complex signal behind the spread spectrum is delivered to two transmitting antennas, and by the specific weight factors w of antenna ₁And w ₂Weighting.Generally weighted factor is plural number, i.e. w _i=a _i+ jb _iWeighted factor (phase adjustment under the corresponding the closed loop mode 1 and phase/amplitude adjustment amount under the closed loop mode 2) is determined by subscriber equipment (UE), and utilize special physical controlling channel of upward (DPCCH, Dedicated Physical Control Channel) feedback information (FBI, Feedback Information) the D bit of field notice universal land radio access web (UTRAN) connects people's point, i.e. cell transceiver.

Dedicated pilot symbol difference (quadrature) to the DPCCH of the different antenna emission of 1, two of closed loop mode; To closed loop mode 2, the dedicated pilot symbol on the DPCCH that launches on two different antennas is identical.

For closed loop transmit diversity modes 1, the 3GPP standard code:

UE is used to two-way Common Pilot Channel from antenna 1 and 2, and (Common Pilot Channel CPICH) calculates phase adjustment, is used for the UTRAN access point and makes the received power maximum of UE.At each time slot, UE calculates the phase adjustment f of the optimum of antenna 2, is quantified as φ then in the following manner _Q:

${\mathrm{\&phi;}}_Q=\left\{\begin{array}{cc}\mathrm{\&pi;},& \mathrm{if\&pi;}/2<\mathrm{\&phi;}-{\mathrm{\&phi;}}_r\left(i\right)\&le;3\mathrm{\&pi;}/2\\ 0,& \mathrm{otherwise}\end{array}\right.$

Wherein:

${\mathrm{\&phi;}}_r\left(i\right)=\left\{\begin{array}{cc}0,& i=\mathrm{0,2,4,6,8,10,12,14}\\ \mathrm{\&pi;}/2,& i=\mathrm{1,3,5,7,9,11},13\end{array}\right.$

If φ _Q=0, then utilize FSM _PhField will order " 0 " to send to UTRAN; If φ _Q=p then utilizes FSM _PhField will order " 1 " to send to UTRAN.

Owing to carried out the rotation of planisphere at UE end, therefore will be according to the φ shown in the relation table of i time slot adjustment amount of following feedback command and up-link wireless frame at the UTRAN end _iAnd the relation between the feedback command that receives of each ascending time slot is carried out " translation " to the order that receives.

Slot#		0	1	2	3	4	5	6	7	8	9	10	11	12	13	14
																	FSM	0 1 `	0 π	π/2 -π/ 2	0 π	π/2 -π/ 2	0 π	π/2 -π/ 2	0 π	π/2 -π/ 2	0 π	π/2 -π/ 2	0 π	π/2 -π/ 2	0 π	π/2 -π/ 2	0 π

The phase place that continuous 2 time slots are received is got sliding window and is obtained weighted factor w after average then ₂:

$w_2=\frac{\underset{i=n-1}{\overset{n}{\mathrm{\&Sigma;}}}\cos \left({\mathrm{\&phi;}}_i\right)}{\sqrt{2}}+j\frac{\underset{i=n-1}{\overset{n}{\mathrm{\&Sigma;}}}\sin \left({\mathrm{\&phi;}}_i\right)}{\sqrt{2}}$

Wherein

φ _i∈{0，π，π/2，-π/2}

To antenna 1, its weighted factor w ₁, always $w_1=1/\sqrt{2}.$ So the UE place mainly needs judgement

w ₂Phase place, be used to control NodeB and obtain bigger descending receiving gain.

For closed loop transmit diversity modes 2, the 3GPP standard code: at closed loop mode 2, phase place and amplitude adjustment amount have 16 kinds of compound modes, and UE can select wherein a kind of according to following table 1 and table 2.Table 1 is the FSM of closed loop mode 2 signaling messages _Po(feedback emission information one amplitude) son field, table 2 is FSM of closed loop mode 2 signaling messages _Ph(feedback emission information one phase place) son field.Different with pattern 1 is that pattern 2 is not carried out the rotation of planisphere at the UE end, need not carry out filtering to the weighting that receives at the UTRAN end.

Table 1:

FSM po

The transmitting power of antenna 1

The color development of antenna 2 and merit

0 1

0.2 0.8

0.8 0.2

Table 2:

FSM ph 000 001 011 010 110 111 101 100

Phase difference (radian) π-3 π between two antennas/4-pi/2-π/4 0 π/4 pi/2s, 3 π/4

In order to obtain best performance, UE and UTRAN connect people's point all will bring in constant renewal in adjustment amount.For example, each time slot, UE all will be reselected FSM from the FSM emission sets of bits of permission given in advance, this is gathered as shown in Figure 2, wherein, bi (0＜=i＜=3), the corresponding FSM bit of arranging from MSB (high order bit) to LSB (low-order bit) is with reference to above-mentioned table 1 and table 1, m=0,1,2,3.

Before sending FSM, UE earlier from 16 kinds may select a best FSM, promptly feed back emission information, in 4 (FSM message-length) time slots of up DPCCH, send this FSM to the order of LSB then according to MSB.In the process of transmitting of FSM, UE will continue to optimize the selection of FSM, and the optimized choice process is as follows:

If FSM launches among time slot k+3 at time slot k, defining its 4 bits is { b ₃(k) b ₂(k+1) b ₁(k+2) b ₀(k+3) }, k=0 wherein, 4,8,12.If received signal intensity P=w ^HH ^HThe estimation received power cost function p that defines among the Hw1 is p ({ x ₃, x ₂x ₁x ₀), { x wherein ₃x ₂x ₁x ₀Be among 16 kinds of FSM, function p has defined phase place and the power bias according to above-mentioned table 1 and table 2 adopted.Above-mentioned b ₃(k), b ₂(k+1), b ₁(k+2), b ₀(k+3) and x ₃, x ₂x ₁x ₀Value be 0 or 1.

Then the bit of the m in the frame (m gets 0,1,2,3) FSM is: from 16 kinds of { x ₃x ₂x ₁x ₀In select one to make p ({ x ₃x ₂x ₁x ₀) maximum one, select X then ₃As b ₃(4m); From 8 kinds of { b ₃(4m) x ₂x ₁x ₀In select one to make p ({ b ₃(4m) x ₂x ₁x ₀) maximum one, select X then ₂As b ₂(4m+1); Again from 4 kinds of { b ₃(4m) b ₂(4m+1) x ₁x ₀In select one to make p ({ b ₃(4m) b ₂(4m+1) x ₁x ₀) maximum one, select x then ₁As b ₁(4m+2); From 2 kinds of { b ₃(4m) b ₂(4m+1) b ₁(4m+2) x ₀In select one to make p ({ b ₃(4m) b ₂(4m+1) b ₁(4m+2) x ₀) maximum one, select X then ₀As b ₀(4m+3);

UTRAN is at each time slot, re-constructs FSM according to the bit of each position of the FSM word that receives recently, and is used for the adjustment of phase place and amplitude (being obtained by power) according to the method for table 1 and table 2 definition.The operating process of UTRAN is that UTRAN safeguards a register z={z ₃z ₂z ₁z ₀, this register root is according to z _i=b _i(ns) (i=0--3, ns=0--14) each time slot upgrades once, z _iBe FSM decision value corresponding bit, its content is used for determining phase place and amplitude adjustment amount, as shown in Table 1 and Table 2.FSM wherein _Ph={ z ₃z ₂z ₁, FSM _Po=z ₀Weighted factor w calculates by following formula:

$\underset{\_}{w}=\left[\begin{array}{c}\sqrt{\mathrm{power}-\mathrm{ant}1}\\ \sqrt{\mathrm{power}-\mathrm{ant}2}\exp (\mathrm{j\; phase}\_\mathrm{diff})\end{array}\right]$

The FBI decision method of general commonly used closed loop transmit diversity modes 2 is: the estimated parameter h that utilizes the channel estimation module to two antenna wireless channels to obtain ₁And h ₂, ask for the phase angle difference of corresponding receive channel, select required weighted factor w again ₂Weights.Concrete grammar is to select weights point w ₂' make the received signal intensity maximum of UE promptly, to make following P have maximum:

P＝w ^HH ^HHw2；

Wherein, H=[h ₁h ₂] and w=[w ₁, w ₂] ^T, column vector h ₁And h ₂Two transmitting antennas 1 estimating of representative and 2 channel impulse response respectively, length is identical with the length of channel impulse response.Phase place that the w corresponding UE calculates and amplitude adjustment amount.() ^HBe the conjugate transpose computing.

The decision method of the corresponding w of above-mentioned concrete adjustment amount is: the channel estimation results of each multipath of getting a time slot is as channel parameter H, and the w that allows for this time slot calculates corresponding received signal intensity P respectively, is court verdict with the w of corresponding P value maximum.

From the above, existing two kinds of closed loop transmit diversity modes are based upon on the disposable judgement basis for pilot channel, with the time slot is that unit adjudicates, owing to only can rely on finite information to adjudicate, and the characteristic that does not have the taking into account system channel slowly to change is unfavorable for that like this UE accurately obtains weights.For pattern 1, because decision pattern is less, although the judgement accuracy is higher, its expected gain is limited; For pattern 2, because decision pattern is more, so its expected gain is bigger, but corresponding judgement accuracy is lower.

In addition, existing Technology of Judgment all is based upon on linear smoothing/filtering method basis, can't effectively suppress channel estimating and calculate in the argument nonlinear operation for the amplification of error.Like this, because the The noise that certainly exists in the real system makes noise be exaggerated, be not easy to obtain court verdict accurately in channel estimating and judging process.In addition,, also can bring certain time-delay, be unfavorable for the application of this technology under the higher situation of mobile station speed judgement owing to need the result of channel estimating in the calculating of P.

Summary of the invention

The objective of the invention is to, the control method and the device of the weight of downgoing emission under a kind of closed loop transmit diversity modes are provided, so that UE obtains higher weights judgement accuracy and expected gain under the closed loop mode diversity mode, and then obtain more desirable reception.

For achieving the above object, the control method of the weight of downgoing emission under the closed loop transmit diversity modes provided by the invention comprises:

Step 1: the weights point decision function under the Closed-Loop Transmit Diversity is set, described decision function:

H ₁＝s _Q1s _I2-s _I1s _Q2；

H ₂＝s _I1s _I2+s _Q1s _Q2；

In the formula, S _I1, S _Q1, S _I2And S _Q2Be respectively the I road of two antennas of correspondence that obtain after the UE demodulation and the demodulation symbol on Q road;

Above-mentioned H ₁, H ₂Two decision functions of corresponding Common Pilot Channel (CPICH) are H _P1And H _P2, two decision functions of corresponding DPCH (DPCH) are H _D1And H _D2, according to decision function H _P1, H _P2And H _D1, H _D2Structure checking decision function:

H _v1＝H _d1×H _p2-H _p1×H _d2

H _v2＝H _p2×H _d2+H _p1×H _d1

Step 2: subscriber equipment (UE) carries out demodulation to Common Pilot Channel (CPICH) signal that receives, and obtains the demodulation result signal of each multipath of CPICH signal, and above-mentioned demodulation result signal is weighted processing;

Step 3: the decision function of demodulation result signal correspondence that calculates each multipath of the CPICH signal after the above-mentioned weighting, obtain the adjusting step-length step1 of the corresponding weights of UE, and determine feedback information (FBI) and export by up channel according to result of calculation and needed precision;

Step 4: to first decision function H of CPICH _P1Symbol count;

Step 5: the count results judgement weights according to above-mentioned steps 4 regulate whether enter stable state, if enter stable state, change step 6, otherwise determine that the adjusting step-length step2 of the corresponding weights of UE is 0, change step 7 then;

Step 6: DPCH is calculated decision function, obtain the weights of UE correspondence and regulate step-length step2;

Step 7: regulate the corresponding weights of UE, step=step1+step2 according to step-length step;

Step 8: return step 1;

Described step 3 further comprises:

Step 31: the j bar that obtains i symbol of corresponding CPICH directly calculates 2 decision function H under the closed loop transmit diversity modes _P1ij, H _P2ijValue;

Step 32: to the decision function H of all multipaths _P1ij, H _P2ijCarry out the addition summation according to the following equation, obtain the decision function H of i symbol _P1i, H _P2iValue;

$H_{\mathrm{pki}}=\underset{j=1}{\overset{N_{\mathrm{path}}}{\mathrm{\&Sigma;}}}{H}_{\mathrm{pkij}},$ K=1,2; N _PathBe the multipath number;

Step 33: to above-mentioned 2 decision function H _P1i, H _P2iCarry out adding up of all symbol judgement functional values according to the following equation respectively, obtain H _P1, H _P2

$H_{\mathrm{pk}}=\underset{i=1}{\overset{N_{\mathrm{counter}}+n-1}{\mathrm{\&Sigma;}}}{H}_{\mathrm{pki}},$ K=1,2, n is the symbol that begins to count, N _CounterBe the required number of times that adds up of FBI precision setting of feedback as required in advance;

Step 34: judge whether the accumulative frequency N that reaches required _CounterIf reach and carry out step 35, otherwise enter step 4;

Step 35: corresponding H _P1, H _P2Obtain the corresponding weights of FBI value and UE and regulate step-length step1;

Step 36: by up channel emission FBI.

The described basis of step 5 is to H _P1Symbol count as a result decision system whether enter stable state and carry out as follows: if to H _P1The ratio of positive and negative count value of symbol count within following ranges Rc, then think to have entered stable state;

Rc ∈ [1/Tc, Tc], wherein Tc is for establishing the good threshold coefficient in advance.

Described step 6 further comprises:

Step 61: the j bar footpath DPCH of i symbol of corresponding DPCH calculates 2 decision function H under the closed loop transmit diversity modes _D1ij, H _D2ijValue;

Step 62: to the decision function H of all multipaths _D1ij, H _D2ijCarry out the addition summation according to the following equation, obtain the decision function H of i symbol _D1i, H _D2iValue;

$H_{\mathrm{dki}}=\underset{j=1}{\overset{N_{\mathrm{path}}}{\mathrm{\&Sigma;}}}{H}_{\mathrm{dkij}},$ K=1,2; N _PathBe the multipath number;

Step 63: to the decision function H of above-mentioned 2 i symbols _D1i, H _D2iCarry out adding up of all symbol judgement functional values according to the following equation respectively, obtain H _D1, H _D2

$H_{\mathrm{dki}}=\underset{j=1}{\overset{N_{\mathrm{path}}}{\mathrm{\&Sigma;}}}{H}_{\mathrm{dkij}},$

K=1,2, n is the symbol that begins to count, N ' _CounterBe the required number of times that adds up of FBI precision setting of feedback as required in advance;

Step 64: judge whether the accumulative frequency N ' that reaches required _CounterIf reach and carry out step 65, otherwise enter step 7;

Step 65: calculate checking decision function H _V1, H _V2, corresponding H _V1, H _V2Obtain the corresponding weights of UE and regulate step-length step2.

The adjusting device of the weight of downgoing emission under the closed loop transmit diversity modes provided by the invention, comprise: signal receiving antenna, wireless signal is converted to the radio-frequency channel of digital baseband signal and digital baseband signal is converted to the CPICH mark signal in many footpaths and the demodulating unit of DPCH mark signal, the a plurality of weighted units that also comprise the CPICH symbol correspondence in many footpaths, the CPICH in corresponding many footpaths and the decision function computing unit of DPCH, sum unit, the unit adds up, the FBI computing unit, the step1 computing unit, revise the decision function computing unit, the step2 computing unit, CPICH compensation value calculation unit and UE weights adjustment unit, wherein:

Weighted units is respectively applied for the correction weighting operation of finishing the CPICH symbol of corresponding multipath, the CPICH symbol of each multipath after the output weighting;

The decision function computing unit according to the CPICH symbol and the DPCH symbol of each multipath after the weighting, is respectively applied for the CPICH that finishes corresponding multipath and the decision function H of DPCH ₁And H ₂Calculating operation;

Sum unit is according to the output result of decision function computing unit, respectively to the H of multipath CPICH ₁Decision function, H ₂Decision function and to the H of multipath DPCH ₁Decision function, H ₂The result of calculation of decision function is carried out sum operation;

The unit that adds up is respectively to the H of the CPICH of sum unit output ₁Decision function, H ₂The H of decision function and DPCH ₁Decision function, H ₂The operation that adds up of the result of calculation of decision function;

The FBI computing unit is used for calculating FBI according to the output result of the unit that adds up;

The step1 computing unit is used for calculating first of weight of downgoing emission according to the output result of unit of adding up and adjusts step-length;

Revise the decision function computing unit, be used for finishing checking decision function H according to the output result of the unit that adds up _V1And H _V2Calculating operation;

The step2 computing unit is used for according to the output result who revises the decision function computing unit, calculates second of weight of downgoing emission and adjusts step-length;

The CPICH compensation value calculation unit is used for the output result of step1 computing unit and step2 computing unit is sued for peace, and obtains total adjustment step-length of weight of downgoing emission;

UE weights adjustment unit is used for determining according to the output result of CPICH compensation value calculation unit the adjusted value of weight of downgoing emission, and this value is outputed to weighted units weight of downgoing emission is adjusted.

Because the present invention utilizes less decision pattern and continually varying channel parameter, step-length is regulated in the stepping that has obtained the system descending emission value, solved the contradiction between judgement accuracy and the expected gain, can be so that UE obtains more desirable reception, simultaneously because the sensitivity to parameter of above-mentioned decision pattern is less, therefore can obtain FBI more accurately, and then obtain than the weight of downgoing emission under the closed loop transmit diversity modes of high weight decision reliability.

Description of drawings

Fig. 1 is a general structure of supporting the downstream transmitter of DPCH closed loop mode transmit diversity;

Fig. 2 is 2 times UE ends of closed loop mode optimized choice scheme schematic diagram;

Fig. 3 Closed-Loop Transmit Diversity location drawing a little that acts;

Fig. 4 is the embodiment flow chart of the method for the invention;

Fig. 5 is the embodiment block diagram of device of the present invention.

Embodiment

The present invention is described in further detail below in conjunction with accompanying drawing.

In order to obtain the judgement of the may command weights under the noise conditions, owing to have The noise in the actual signal, so must satisfy following the requirement: the reliability of judgement (weighing to adjudicate correct probability or mistake in judgment probability) must be controlled, and promptly can effectively increase the correct probability of judgement by means such as multiple averaging or smothing filterings; From another angle, the sensitivity to parameter that is exactly decision function is little.

Weights determination point under the closed loop transmit diversity modes as shown in Figure 3, it is distributed on 4 points, and only has angle judgement.According to agreement, the control judgement can be divided into 2 zones:

H1: required weights are on poincare half plane;

H2: required weights are on RHP;

Acting in conjunction by above-mentioned two judgements can unique position of determining required weights point.Above-mentioned two corresponding decision functions of judgement are:

H ₁＝s _Q1s _I2-s _I1s _Q2；H ₂＝s _I1s _I2+s _Q1s _Q2；

In the formula, S _I1, S _Q1, S _I2And S _Q2Be respectively the I road of two antennas of correspondence that obtain after the demodulation and the demodulation symbol on Q road.Owing to only have multiplication and add operation in these two decision functions, so can think that parameter is insensitive.

If the decision function H of judgment condition H1 and H2 correspondence ₁And H ₂Greater than 0, then corresponding judgement is set up, otherwise corresponding judgement is false.

The phase difference of the corresponding different corresponding wireless channels of two antennas is taked following weight w ₂The adjusting step-length of phase parameter is as shown in table 3 below, can reach good regulating effect, and table 3 has illustrated the relation between channel parameter phase difference and the compensation of phase.Channel phase difference place quadrant can be obtained by FBI, and then the offset angle of required adjusting can be obtained by following table.By the adjusting that is the cycle with two time slots, ideally, regulate by maximum 20 times, can adjusted precision be π/32 control phase as a result worst error be π, need regulate 8 times at second quadrant, need regulate 16 times, can be adjusted to 0 (ideal value) at first quartile.But because the minimal adjustment step-length is π/16, according to control principle, minimum control precision is π/32).

Table 3:

Quadrant	(H p1，H p2)	FBI	Phase difference	Regulate step-length
					I	(+，+)	(0，1)	[0，π/2)	-π/16
II	(-，+)	(1，1)	[π/2，π)	-π/8
					III	(-，-)	(1，0)	[-π，-π/2)	π/8
IV	(+，-)	(1，1)	[-π/2，0)	π/16

In the table 3, first classifies the quadrant position of antenna 2 and antenna 1 signal phase difference place planisphere as; Second classifies the decision function (H of the CPICH corresponding with the phase difference position as _P1, H _P2) the symbol of functional value; The 3rd classifies the value of the FBI bit (high position and low level) that corresponding up channel need launch as; The 4th classifies the span of phase difference as; The 5th classifies the adjusting step-length of required correction as.These data are corresponding one by one according to row.H _P1And H _P2Be H ₁, H ₂Two decision functions of corresponding CPICH.In the down physical channel of system base-station emission, Common Pilot Channel (CPICH) is the successional pilot channel of distinguishing two antennas, and power is higher, is suitable for the measurement of channel.But,, can not be weighted adjusting because CPICH is a common signal channel.Measurement parameter in the last table is poor for two antenna respective channels phase parameters after regulating, and the CPICH signal that can't directly receive by antenna end is regulated like this.Need to carry out at the UE end to received signal the weighting adjusting of anolog base station, just can finish the adjusting task.Simultaneously,, need verify the influence of compensation error code to DPCH (DPCH) for fear of of the influence of up FBI error code to system gain.

Whether the adjusting of at first judging weight of downgoing emission enters stable state, if enter stable state, promptly starts the checking with reference to DPCH.The stable state of said system is meant, UE is by regulating, and makes that the phase difference of two antenna respective channels is 0 or near 0.At this moment, judgement is swung between quadrant I and quadrant IV.This state can be by regulating the positive and negative continually judgement that hockets of symbol of step-length.

Described. with reference to the checking of DPCH, be because in up FBI modulation process, may produce error code, thereby make that the adjusting weights of base station are inconsistent with the control weights that UE expects.In order to address this is that, when the adjusting of UE judgement weights enters stable state, promptly need to carry out the antenna verification operation.By the channel parameter estimation of reference DPCH channel, revise the weights of UE end anolog base station weighting, thereby the weights of further regulating NodeB make that descending receiving gain is bigger.In existing standard, DPCH is less for inserting pilot tone and transmitting power, so need more time smoothly just can reach the certainty of measurement of needs.

If above-mentioned H ₁, H ₂Two decision functions of corresponding CPICH are H _P1And H _P2, two decision functions of corresponding DPCH are H _D1And H _D2, the decision function of structure checking:

H _v1＝H _d1×H _p2-H _p1×H _d2

H _v2＝H _p2×H _d2+H _p1×H _d1

After reaching the data acquisition time of checking needs at every turn, calculate the decision function of checking successively, hold the weights that carry out the anolog base station weighting once to adjust at UE to received signal to needs then, adjust step-length and regulate the compensation relationship table with reference to following checking decision function and descending weights:

Table 4:

Quadrant	(H v1，H v2)	CPICH and DPCH phase difference	Weights are regulated step-length
				I	(+，+)	[0，π/2)	-π/32
II	(-，+)	[π/2，π)	-π/8
				III	(-，-)	[-π，-π/2)	π/8
IV	(+，-)	[-π/2，0)	π/32

In the table 4, first classifies as because the quadrant position of the DPCH phase difference between signals place planisphere of CPICH channel signal that the UE that up error code causes proofreaies and correct and Node B emission; Second classifies the decision function (H of the checking corresponding with the phase difference position as _V1, H _V2) the symbol of functional value; The 3rd classifies the span of both phase differences as; The 4th classifies the adjusting step-length of required compensation as.These data are corresponding one by one according to row.

Fig. 4 is the embodiment flow chart of the method for the invention.According to Fig. 4, at first subscriber equipment (UE) carries out demodulation at the step 1 pair Common Pilot Channel that receives (CPICH) signal, obtains the demodulation result signal of each multipath of CPICH signal, is weighted processing at step 2 pair above-mentioned demodulation result signal then.The then decision function of the demodulation result signal correspondence of each multipath of the CPICH signal after step 3 is calculated above-mentioned weighting, obtain first of the corresponding weights of UE according to result of calculation and regulate step-length step1, and determine the occurrence of feedback information (FBI) and export to the signal transmitter of system by up channel according to result of calculation and needed weights degree of regulation, to finish the adjusting of weight of downgoing emission.Because the actual FBI that obtains of FBI may be inconsistent with the desired value of UE, also need the degree of stability decision regulated according to weight of downgoing emission whether to feed back to the FBI value of system transmitter with reference to the information correction of DHCP.Therefore UE is at first decision function H of step 4 couple CPICH _P1Symbol count.After entering stable state, the ideal value of the phase angle difference of two antennas is 0.Because the influence of noise and departure, the phase angle difference of two antennas first and four-quadrant between move, and it is identical to be positioned at the probability of two quadrants.Showing on the decision function, is exactly H _P1Symbol be that the number of times of positive sign or negative sign is roughly the same.Therefore, by to H _P1The method of counting can be adjudicated weights and be regulated whether enter stable state.Regulate whether enter stable state in step 5 according to the count results judgement weights of above-mentioned steps 4, if enter stable state, explanation need be regulated weights with reference to the information of DHCP and revise, therefore calculate decision function at step 6 couple DPCH, obtain weights checking second and regulate step-length step2, otherwise illustrate not need weights are regulated and revise, therefore determine directly that in step 7 it is 0 that second of the corresponding weights of UE are regulated step-length step2.After the second adjustment step-length step2 determines, calculate total weights in step 8 and regulate step-length, promptly step=step1+step2 regulates the corresponding weights of step-length step adjusting UE in step 9 according to total weight value at last, returns step 1 and continues loop control.

The performing step of above-mentioned steps 3 is with reference to following described:

Step 31: the j bar of i symbol of corresponding CPICH directly calculates 2 decision function H under the closed loop transmit diversity modes _P1ij, H _P2ijValue; Described decision function is:

H _P1ij=s _Q1ijs _I2ij-s _I1ijs _Q2ijAnd H _P2ij=s _I1ijs _I2ij+ s _Q1ijs _Q2ij

In the formula, S _I1ij, S _Q1ij, S _I2ijAnd S _Q2ijBe respectively the I road of two the antenna CPICH of correspondence that obtain behind the j bar multi-path demodulation of i counting and the frequency pilot sign on Q road.

Step 3.2: to the decision function H of all multipaths _P1ij, H _P2ijCarry out the addition summation according to the following equation, obtain the decision function H of i symbol _P1i, H _P2iValue;

$H_{\mathrm{pki}}=\underset{j=1}{\overset{N_{\mathrm{path}}}{\mathrm{\&Sigma;}}}{H}_{\mathrm{pkij}},$ K=1,2; N _PathBe the multipath number;

Step 33: to above-mentioned 2 decision function H _P1i, H _P2iCarry out adding up of all symbol judgement functional values according to the following equation respectively, obtain H _P1, H _P2

$H_{\mathrm{pk}}=\underset{i=n}{\overset{N_{\mathrm{counter}}+n-1}{\mathrm{\&Sigma;}}}{H}_{\mathrm{pki}},$

K=1,2, n is the symbol that begins to count, N _CounterBe the required number of times that adds up of FBI precision setting of feedback as required in advance;

Step 34: judge whether the accumulative frequency N that reaches required _CounterIf reaches and carry out step 35, otherwise the operation of end step 3 enters step 4;

Step 35: corresponding H _P1, H _P2Obtain the FBI value and obtain the corresponding weights first of UE to regulate step-length Step1 according to above-mentioned table 3 according to table 3.

Step1 determines like this: according to decision function H _PkThe symbol of (k=1,2) (secondary series in the table) obtains step1 (last row in the table).

For example, two decision function symbols that calculate are respectively (H _P1, H _P2)=(+,+), then, can obtain step1=-π/16 according to second row of table; Corresponding FBI decision method is, if the timeslot number of current system be even number (0,2 ... 14), FBI=0 then; Otherwise, timeslot number be odd number (1,3 ... 13), this moment FBI=1.Other situations, the rest may be inferred.

Step 36: by up channel emission FBI.

Above-mentioned steps 5 described bases are to H _P1Symbol count as a result decision system whether enter stable state and carry out as follows: if to H _P1The ratio of positive and negative count value of symbol count within following ranges Rc, then think to have entered stable state;

Described Rc ∈ [1/Tc, Tc], wherein Tc is for establishing the good threshold coefficient in advance.

The performing step of above-mentioned steps 6 is with reference to following described:

Step 61: the j bar footpath DPCH of i symbol of corresponding DPCH calculates 2 decision function H under the closed loop transmit diversity modes _D1ij, H _D2ijValue; Described decision function is:

H _D1ij=s _DQ1ijs _DI2ij-s _DI1ijs _DQ2ijAnd H _D2ij=s _DI1ijs _DI2ij+ s _DQ1ijs _DQ2ij

In the formula, S _DI1ij, S _DQ1ij, S _DI2ijAnd S _DQ2ijBe respectively the I road of two the antenna DPCH of correspondence that obtain behind the j bar multi-path demodulation of i counting and the frequency pilot sign on Q road.

Step 62: to the decision function H of all multipaths _D1ij, H _D2ijCarry out the addition summation according to the following equation, obtain the decision function H of i symbol _D1i, H _D2iValue;

$H_{\mathrm{jki}}=\underset{j=1}{\overset{N_{\mathrm{paath}}}{\mathrm{\&Sigma;}}}{H}_{\mathrm{dkij},}$

K=1,2; N _PathBe the multipath number.

Step 63: to the decision function H of above-mentioned 2 i symbols _D1i, H _D2iCarry out adding up of all symbol judgement functional values according to the following equation respectively, obtain H _D1, H _D2

$H_{\mathrm{dh}}=\underset{i=n}{\overset{N_{\mathrm{counter}}+n-1}{\mathrm{\&Sigma;}}}{H}_{\mathrm{dki},}$

K=1,2, n is the symbol that begins to count, N ' _CounterFor in advance

The required number of times that adds up of Fan Kui FBI precision setting as required;

Step 64: judge whether the accumulative frequency N ' that reaches required _CountcrIf reach and carry out step 65, otherwise enter step 7;

Step 65: calculate checking decision function H _V1, H _V2,

H _v1＝H _d1×H _p2-H _p1×H _d2；H _v2＝H _p2×H _d2+H _p1×H _d1；

Corresponding H _V1, H _V2, obtain the corresponding weights of UE according to table 4 and regulate step-length step2.

Step2 determines like this: according to decision function H _V1, H _V2Symbol (secondary series in the table) obtain step2 (last row in the table).

For example, two decision function symbols that calculate are respectively (H _V1, H _V2)=(-,-), then, can obtain step2=π/32 according to the third line of table.Other situations, the rest may be inferred.

The adjusting device of the weight of downgoing emission under the closed loop transmit diversity modes provided by the invention, comprise: signal receiving antenna 50, wireless signal is converted to the radio-frequency channel 501 of digital baseband signal and digital baseband signal is converted to the CPICH mark signal in many footpaths and the demodulating unit 52 of DPCH mark signal, also comprise a plurality of weighted units 531--53N of the CPICH symbol correspondence in many footpaths, the CPICH in corresponding many footpaths and the decision function computing unit 541--54N of DPCH, sum unit 551--554, unit 561--564 adds up, FBI computing unit 57, step1 computing unit 58, revise decision function computing unit 591--592, step2 computing unit 510, CPICH compensation value calculation unit 511, UE weights adjustment unit 512 and control unit 513.Wherein:

Weighted units 531-53N finishes the correction weighting operation of the CPICH symbol of corresponding multipath, the CPICH symbol of each multipath after the output weighting.The CPICH symbol of this each multipath is sent to decision function computing unit 541-54N, finishes the CPICH of corresponding multipath and the decision function H of DPCH ₁And H ₂Computing function.For example the corresponding computing unit 541 in first footpath comprises the H of CPICH respectively ₁The H of function calculation unit 5411, CPICH ₂The H of function calculation unit 5412, DPCH ₁The H of function calculation unit 5413 and DPCH ₂Function calculation unit 5414; The computing unit of corresponding other multipaths has identical structure with Unit 541.These computing units are exported the value of corresponding decision function respectively.

Sum unit 551--554 is respectively applied for the multipath calculated value of finishing corresponding decision function and merges (addition) function, comprises the H of CPICH ₁The H of function sum unit 551, CPICH ₂The H of function sum unit 552, DPCH ₁The H of function sum unit 553 and DPCH ₂Function sum unit 554 is exported the merging value of corresponding decision function.Above-mentioned sum unit 551--554 is the H of the CPICH of corresponding decision function computing unit 541-54N respectively ₁The H of function sum unit, CPICH ₂The H of function sum unit, DPCH ₁The H of function sum unit and DPCH ₂The function sum unit.

The unit that adds up is delivered in the output of above-mentioned sum unit 551--554 respectively, and promptly accumulator 561-564 finishes the accumulation function that corresponding decision function merges (addition) value respectively, comprises the H of CPICH ₁The add up H of unit 561, CPICH of function ₂The add up H of unit 562, DPCH of function ₁The add up H of unit 563 and DPCH of function ₂The function unit 564 that adds up.The above-mentioned corresponding accumulated value that adds up unit output is delivered to FBI computing unit 57, step1 computing unit 58 respectively, is revised decision function computing unit 591--592.

FBI computing unit 57 is used to finish the calculating of the FBI information of up emission, and FBI as a result is transmitted to system by up channel.

Step1 computing unit 58 is used to finish the decision function H of CPICH _P1And H _P2Calculating, tabling look-up according to result of calculation 3 obtains first of the corresponding weights of UE and regulates the value of step-length step1 and export this step1;

Revise the decision function computing unit and comprise H _V1Decision function computing unit 591 and H _V2Decision function computing unit 592, and export the value of corresponding decision function.Above-mentioned H _V1And H _V2Value be sent to the computing unit 510 that second of the corresponding weights of UE are regulated step-length step2, obtain the value of step2 and the value of output step2 with input according to table 4 and control unit 513;

The output valve of above-mentioned step1 computing unit 58 and step2 computing unit is sent to CPICH compensation value calculation unit 511, finishes step1 and step2 add operation mutually, then with addition result output, as the CPICH phase compensation value.This value is sent to UE weights adjustment unit 512, finishes the calculating of phase compensation value, after calculating is finished, the result is outputed to the compensating operation that weighted units 531--53N finishes weights.Control unit 513 is used to finish the whole control operation of whole system, and this control operation realizes by the control to FBI computing unit 57, step1 computing unit 58 and step2 computing unit 510 in this example.

Claims (5)

1, the control method of the weight of downgoing emission under a kind of closed loop transmit diversity modes is characterized in that comprising:

Step 1: the weights point decision function under the Closed-Loop Transmit Diversity is set, described decision function:

H ₁＝s _Q1S _I2-s _I1s _Q2；

H ₂＝s _I1s _I2+s _Q1s _Q2；

In the formula, S _I1, S _Q1, S _I2And S _Q2Be respectively the I road of two antennas of correspondence that obtain after the UE demodulation and the demodulation symbol on Q road;

Above-mentioned H ₁, H ₂Two decision functions of corresponding Common Pilot Channel (CPICH) are H _P1And H _P2, two decision functions of corresponding DPCH (DPCH) are H _D1And H _D2, according to decision function H _P1, H _P2And H _D1, H _D2Structure checking decision function:

H _v1＝H _d1×H _p2-H _p1×H _d2

H _v2＝H _p2×H _d2+H _p1×H _d1

Step 2: subscriber equipment (UE) carries out demodulation to Common Pilot Channel (CPICH) signal that receives, and obtains the demodulation result signal of each multipath of CPICH signal, and above-mentioned demodulation result signal is weighted processing;

Step 3: the decision function of demodulation result signal correspondence that calculates each multipath of the CPICH signal after the above-mentioned weighting, obtain the adjusting step-length step1 of the corresponding weights of UE, and determine feedback information (FBI) and export by up channel according to result of calculation and needed precision;

Step 4: to first decision function H of CPICH _P1Symbol count;

Step 5: the count results judgement weights according to above-mentioned steps 4 regulate whether enter stable state, if enter stable state, change step 6, otherwise determine that the adjusting step-length step2 of the corresponding weights of UE is 0, change step 7 then;

Step 6: DPCH is calculated decision function, obtain the weights of UE correspondence and regulate step-length step2;

Step 7: regulate the corresponding weights of UE, step=step1+step2 according to step-length step;

Step 8: return step 1.

2, the control method of the weight of downgoing emission under the closed loop transmit diversity modes according to claim 1 is characterized in that, described step 3 further comprises:

Step 31: the j bar that obtains i symbol of corresponding CPICH directly calculates 2 decision function H under the closed loop transmit diversity modes _P1ij, H _P2ijValue;

Step 32: to the decision function H of all multipaths _P1ij, H _P2ijCarry out the addition summation according to the following equation, obtain the decision function H of i symbol _P1i, H _P2iValue;

$H_{\mathrm{pki}}=\underset{j=1}{\overset{N_{\mathrm{path}}}{\mathrm{\&Sigma;}}}{H}_{\mathrm{pkij}},$ K=1,2; N _PathBe the multipath number;

Step 33: to above-mentioned 2 decision function H _P1i, H _P2iCarry out adding up of all symbol judgement functional values according to the following equation respectively, obtain H _P1, H _P2

$H_{\mathrm{pk}}=\underset{i=n}{\overset{N_{\mathrm{counter}}+n-1}{\mathrm{\&Sigma;}}}{H}_{\mathrm{pki}},$ K=1,2, n is the symbol that begins to count, N _CounterBe the required number of times that adds up of FBI precision setting of feedback as required in advance;

Step 34: judge whether the accumulative frequency N that reaches required _CounterIf reach and carry out step 35, otherwise enter step 4;

Step 35: corresponding H _P1, Hp ₂Obtain the corresponding weights of FBI value and UE and regulate step-length step1;

Step 36: by up channel emission FBI.

3, the control method of the weight of downgoing emission under the closed loop transmit diversity modes according to claim 2 is characterized in that, the described basis of step 5 is to H _P1Symbol count as a result decision system whether enter stable state and carry out as follows: if to H _P1The ratio of positive and negative count value of symbol count within following ranges Rc, then think to have entered stable state;

Described Rc ∈ [1/Tc, Tc], wherein Tc is for establishing the good threshold coefficient in advance.

4, the control method of the weight of downgoing emission under the closed loop transmit diversity modes according to claim 3 is characterized in that, described step 6 further comprises:

Step 61: the j bar footpath DPCH of i symbol of corresponding DPCH calculates 2 decision function H under the closed loop transmit diversity modes _D1ij, H _D2ijValue;

Step 62: to the decision function H of all multipaths _D1ij, H _D2ijCarry out the addition summation according to the following equation, obtain the decision function H of i symbol _D1i, H _D2iValue;

$H_{\mathrm{dki}}=\underset{j=1}{\overset{N_{\mathrm{path}}}{\mathrm{\&Sigma;}}}{H}_{\mathrm{dkij}},$ K=1,2; N _PathBe the multipath number;

Step 63: to the decision function H of above-mentioned 2 i symbols _D1i, H _D2iCarry out adding up of all symbol judgement functional values according to the following equation respectively, obtain H _D1, H _D2

$H_{\mathrm{dk}}=\underset{i=n}{\overset{N_{\mathrm{counter}}+n-1}{\mathrm{\&Sigma;}}}{H}_{\mathrm{dki}},$ K=1,2, n is the symbol that begins to count, N ' _CounterBe the required number of times that adds up of FBI precision setting of feedback as required in advance;

Step 64: judge whether the accumulative frequency N ' that reaches required _CounterIf reach and carry out step 65, otherwise enter step 7;

Step 65: calculate checking decision function H _V1, Hv ₂, corresponding H _V1, Hv ₂Obtain the corresponding weights of UE and regulate step-length step2.

5, the adjusting device of the weight of downgoing emission under a kind of closed loop transmit diversity modes, comprise: signal receiving antenna, wireless signal is converted to the radio-frequency channel of digital baseband signal and digital baseband signal is converted to the CPICH mark signal in many footpaths and the demodulating unit of DPCH mark signal, it is characterized in that, the a plurality of weighted units that also comprise the CPICH symbol correspondence in many footpaths, the CPICH in corresponding many footpaths and the decision function computing unit of DPCH, sum unit, the unit adds up, the FBI computing unit, the step1 computing unit, revise the decision function computing unit, the step2 computing unit, CPICH compensation value calculation unit and UE weights adjustment unit, wherein:

Weighted units is respectively applied for the correction weighting operation of finishing the CPICH symbol of corresponding multipath, the CPICH symbol of each multipath after the output weighting;

The decision function computing unit according to the CPICH symbol and the DPCH symbol of each multipath after the weighting, is respectively applied for the CPICH that finishes corresponding multipath and the decision function H of DPCH ₁And H ₂Calculating operation;

Sum unit is according to the output result of decision function computing unit, respectively to the H of multipath CPICH ₁Decision function, H ₂Decision function and to the H of multipath DPCH ₁Decision function, H ₂The result of calculation of decision function is carried out sum operation;

The unit that adds up is respectively to the H of the CPICH of sum unit output ₁Decision function, H ₂The H of decision function and DPCH ₁Decision function, H ₂The operation that adds up of the result of calculation of decision function;

The FBI computing unit is used for calculating FBI according to the output result of the unit that adds up;

The step1 computing unit is used for calculating first of weight of downgoing emission according to the output result of unit of adding up and adjusts step-length;

Revise the decision function computing unit, be used for finishing checking decision function H according to the output result of the unit that adds up _V1And H _V2Calculating operation;

The step2 computing unit is used for according to the output result who revises the decision function computing unit, calculates second of weight of downgoing emission and adjusts step-length;

The CPICH compensation value calculation unit is used for the output result of step1 computing unit and step2 computing unit is sued for peace, and obtains total adjustment step-length of weight of downgoing emission;

UE weights adjustment unit is used for determining according to the output result of CPICH compensation value calculation unit the adjusted value of weight of downgoing emission, and this value is outputed to weighted units weight of downgoing emission is adjusted.

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