CN1253420A - Rayke receiver and speed detecting circuit - Google Patents
Rayke receiver and speed detecting circuit Download PDFInfo
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- CN1253420A CN1253420A CN99118386A CN99118386A CN1253420A CN 1253420 A CN1253420 A CN 1253420A CN 99118386 A CN99118386 A CN 99118386A CN 99118386 A CN99118386 A CN 99118386A CN 1253420 A CN1253420 A CN 1253420A
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Abstract
To provide a rake receiver capable of suppressing a drop call at the time of handover by quickly detecting a signal from a moving destination base station even at the time of high speed moving. Searchers 2a to 2c inversely diffuse a digital signal from an A/D converter 1 and demodulate it by respectively using the diffusion code of a class indicated from a controlling part 5 and the timing of inverse diffusion and notifies these demodulation results to the controlling part 5. A mobile speed deciding means 5a decides the speed of a mobile communication terminal device in accordance with mobile speed information detected by a speed detection circuit in the searcher 2a. A searcher controlling means 5b performs ON/ OFF control of the searchers 2a to 2c in accordance with the speed decided by the means 5a. A forgetting coefficient controlling means 5c switches and controls the value of a forgetting coefficient &alpha in accordance with a speed decided by the means 5a and enhances sensitivity to signal intensity from the base station of a moving destination.
Description
The present invention relates to be used for Rake (Rake) receiver and the velocity checking circuits of the mobile communication terminal of CDMA (Code Division Multiple Access) mode.
In recent years, in mobile communication system,, adopt the CDMA mode as the stronger communication mode of antijamming capability.The cdma communication mode is come the extend information symbol with spreading rate, expands the bandwidth of transmission signals, thus, can realize the separation of multipath.
For example, in the mode that meets American TI A standard (IS-95A),, thus,, can separate if leave the above multipath of 1 chip with spreading rate (1.2288MHz) extend information symbol (19.2KHz) (rate of spread 64).
On the other hand, in the mode that the transmission signals of the narrow-band such with FDMA (Frequency Division Multiple Access) mode and TDMA (Time Division Multiple Access) mode communicates, shown in Figure 12 (a) like that, because the multipath of change decline in time, received power sharply descends, and produces so-called flat fading.
Relative therewith, in the CDMA mode, by the broad in band of transmission signals, even multipath decline takes place, shown in Figure 12 (b) like that, because only some frequency spectrum is short of, so all received powers can sharply not descend, and, even a part of frequency spectrum shortcoming, owing to carried out receiving the path diversity of utilizing the multipath that separates energetically, and can access good reception characteristics by Rake.
In Figure 13, represented to carry out the Rake receiver of the existing mobile communication terminal that such Rake receives.
After the RF signal that the base station sent is received by antenna (not shown), in A/D converter (1), be transformed to digital signal, be input to respectively then in search section (20) and the demodulation section (30).
Search section (20) is by searcher (20a)～(20c) form.Searcher (20a)～(20c) uses respectively by the escape character of the indicated kind of control part (50) and the timing of de-spread, to carrying out de-spread and demodulation from the digital signal of A/D converter (1), detect the level of this demodulation result, be notified to control part (50).
Kind by the indicated escape character of control part (50) is the escape character of distributing to the escape character of each base station and distributing to this machine.
Demodulation section (30) is by referring to that (finger) (30a)～(30d) forms.Refer to that (30a)～(30d) uses by control part (50) indicated escape character and timing, to carrying out de-spread and carry out demodulation from the digital signal of A/D converter (1).And, refer to that (30a)～(30d) detects the level of the signal of demodulation respectively, is notified to control part (50).
Combiner circuit (4) is exported to synthetic result the decoding circuit (not shown) of back level being synthesized by the signal that refers to the demodulation of (30a)～(30d) institute.
Control part (50), give searcher (20a)～(20c) like that and refer to that (30a)～(30d) distributes the kind of escape character and the timing of de-spread by above-mentioned, simultaneously, monitor level by the decoded signal of searcher (20a)～(20c) and finger (30a)～(30d) notified.
Control part (50), by the level of searcher (20a)～(20c) notified greater than situation by the level that refers to (30a)～(30d) notified under, the timing allocation of escape character that in the searcher that detects this bigger level (20a)～(20c), uses and de-spread to the finger (30a)～(30d) of notifying the level littler than this level.
By such formation, Rake receiver is given the high signal allocation of incoming level to refer to (30a)～(30d) in multi-path signal, and has realized the path diversity that received respectively by a plurality of fingers (30a)～(30d).
And, in Rake receiver, except above-mentioned path diversity, also realized soft handover and so-called cell diversity.Cell diversity, when mobile communication corresponding terminal installation M moves to the sub-district of base station B from the sub-district of base station A and switches, communicate by the base station A that before switching, uses on one side, on one side the escape character of distributing to respectively with the approaching base station of base station A is distributed to searcher (20a)～(20c) successively, supervision is by the level of each searcher (20a)～(20c) notified, detect the base station B of moving target, and report that to base station A the base station of moving target is the meaning of base station B.
Relative therewith, base station A notifies the escape character of distributing to mobile communication terminal M to base station B, so that mobile communication terminal M can communicate by base station B by connecting the network between the base station.Base station B uses the escape character of the mobile communication terminal M that is notified by base station A, and the signal that begins to carry out to mobile communication terminal M sends.
Mobile communication terminal M receives on one side the signal from base station A and base station B two sides to be synthesized by Rake and receives, on one side in the sub-district that moves to base station B fully the time, carry out communication once more by base station B based on path diversity.
By such cell diversity,, also can proceed the communication that can not interrupt even switch.
But when carrying out minizone mobile by high-speed mobile, there is the possibility that call drop takes place in the Rake receiver of above-mentioned existing formation.Figure 14 represents the variation from the signal strength signal intensity of base station B in the mobile communication terminal M that base station B moves, and represents that respectively low speed moves and high-speed mobile.
As shown in Figure 14, when high-speed mobile, compare when moving with low speed, signal strength signal intensity from base station B sharply increases, but when high-speed mobile, compares when moving with low speed, near base station B, therefore, the base station number that can verify lacks when moving than low speed at short notice.
Therefore, depend on the supervision order (allocation order of the escape character of checking) of base station, use the checking of the escape character of base station B to fail to carry out, therefore, compare when moving, when high-speed mobile with low speed, as shown in Figure 15, on average, the detection of base station B lags behind.
Like this, when the detection of base station B lags behind, near during the B of base station, send signal to mobile communication terminal M as yet from base station B, therefore, become disturbing wave on the contrary from the signal of base station B, call drop takes place.
That is, when high-speed mobile, under the mobile situation about must switch because of the minizone, from the signal of base station detection hysteresis of moving target, and there is the problem that call drop takes place in existing Rake receiver.
In order to address the above problem, the invention provides a kind of Rake receiver, can when high-speed mobile, promptly detect signal, the call drop in the time of can suppressing to switch from the communication counterpart platform.
And, the purpose of this invention is to provide the Rake receiver and the velocity checking circuits of the translational speed that can detect this machine.
And, the purpose of this invention is to provide the Rake receiver that has alleviated consumed power.
And, the purpose of this invention is to provide Rake receiver, its can be visually to the translational speed of this machine of user report.
To achieve these goals, Rake receiver involved in the present invention comprises: digital conversion device is transformed to digital signal to received signal; A plurality of de-spread devices use the various escape characters of distributing to the communication counterpart platform successively, and the received signal that is transformed to digital signal by digital conversion device is carried out de-spread with various timings; Path detection device monitors by the intensity of the received signal of this a plurality of de-spread device institute de-spread, detects the escape character of the de-spread that is suitable for received signal and the timing of de-spread; A plurality of demodulating equipments use by detected escape character of this path detection device and timing, carry out de-spread to received signal, and carry out demodulation; Synthesizer being synthesized by a plurality of received signals of these demodulating equipment institute demodulation, is characterized in that, also comprises: the translational speed checkout gear, detect the translational speed of this machine; The detection sensitivity control device along with the detected translational speed of this translational speed checkout gear becomes at a high speed, improves the detection sensitivity of path detection device to the intensity of the received signal of de-spread.
In the Rake receiver of above-mentioned formation of the present invention, detect the translational speed of this machine, along with this detected translational speed becomes at a high speed, improve the detection sensitivity of path detection device to the intensity of the received signal of de-spread.
Like this,, under the situation that this machine moves,, in the lower zone of receiving intensity, can detect received signal, and seek rapidization of communicating by letter from communication counterpart owing to improved the detection sensitivity of received signal according to Rake receiver of the present invention.Thus,, detect from the signal of base station of moving target and to carry out quickly, can suppress by the input caused call drop that lags behind than usually even must carry out handover because of the high-speed mobile of minizone the time.
And to achieve these goals, Rake receiver involved in the present invention comprises: digital conversion device is transformed to digital signal to received signal; A plurality of de-spread devices use the various escape characters of distributing to the communication counterpart platform successively, and the received signal that is transformed to digital signal by digital conversion device is carried out de-spread with various timings; Path detection device monitors by the intensity of the received signal of this a plurality of de-spread device institute de-spread, detects the escape character of the de-spread that is suitable for received signal and the timing of de-spread; A plurality of demodulating equipments use by detected escape character of this path detection device and timing, carry out de-spread to received signal, and carry out demodulation; Synthesizer being synthesized by a plurality of received signals of these demodulating equipment institute demodulation, is characterized in that, also comprises: the translational speed checkout gear, detect the translational speed of this machine; Motion control device along with the detected translational speed of this translational speed checkout gear becomes at a high speed, increases the amount of action of a plurality of de-spread devices.
In the Rake receiver of above-mentioned formation, detect the translational speed of this machine, along with detected translational speed becomes at a high speed, and increase the amount of action of de-spread device.Like this, according to Rake receiver of the present invention, when when stopping and with low speed, moving, under the situation about less changing in the path, a plurality of de-spread devices are unnecessarily moved, and, when high-speed mobile, under the violent situation of the change in path, make more de-spread device action, therefore, can change in corresponding path, alleviate consumed power simultaneously based on translational speed.
And Rake receiver involved in the present invention is characterized in that, digital conversion device comprises: converting means, and take a sample to received signal and be transformed to digital signal; Withdrawing device in the sampling by the digital signal of converting means institute conversion, takes out and the corresponding continuous a plurality of samplings of the indication of control signal, is used as being used for being undertaken by a plurality of de-spread devices the digital signal of de-spread; Extract position control out,, control the sampling that withdrawing device takes out changeably by control signal according to intensity by a plurality of samplings that this withdrawing device took out; And the translational speed checkout gear detects the translational speed of this machine according to the control signal of exporting from the extraction position control.
The Rake receiver of above-mentioned formation, in digital conversion device, converting means is taken a sample with for example per 1 chip, 8 bits, then, withdrawing device takes out the sampling of 3 for example continuous bits in above-mentioned 8 bits, be used as being used for being undertaken the digital signal of de-spread, extract the intensity of position control out, the extracting position of control sampling according to the sampling of above-mentioned 3 bits by a plurality of de-spread devices.In such digital conversion device, along with the translational speed high speed, the intensity of 3 bits that taken out changes, and therefore, when the translational speed high speed, the control signal by extracting position control out is to the frequency gets higher of the control of withdrawing device.The present invention is conceived to this point, monitors this control frequency by the translational speed checkout gear, detects translational speed.
Like this, in the Rake receiver of above-mentioned formation, do not need to be provided with separately transducers such as the accelerometer that detects translational speed and gyro, just can detect translational speed.
And, in Rake receiver involved in the present invention, it is characterized in that, path detection device comprises: arithmetic unit, intensity cumulative addition by the received signal of de-spread device institute de-spread, when this cumulative addition, the intensity of the intensity of cumulative addition in the past and new received signal by de-spread device institute de-spread is carried out addition with the ratio corresponding with variable value α; Checkout gear, when the cumulative addition result of this arithmetic unit surpassed predefined fiducial value, the timing that detects the escape character that uses this moment and de-spread was used as being suitable for the escape character and regularly of the de-spread of received signal; And the translational speed that the detection sensitivity control device detects along with the translational speed checkout gear becomes at a high speed, and control variable value α, so that the ratio that arithmetic unit improves by the intensity of the new received signal of de-spread device institute de-spread carries out cumulative addition, thereby improve above-mentioned detection sensitivity.
Rake receiver according to above-mentioned formation, under the situation of translational speed high speed, the ratio that arithmetic unit improves by the intensity of the new received signal of de-spread device institute de-spread carries out cumulative addition, therefore, the result of the accumulation computing of above-mentioned arithmetic unit has further reflected the intensity by the new received signal of de-spread device institute de-spread.Thus, under the situation that the intensity of received signal increases when in high-speed mobile, the result of the accumulation computing of above-mentioned arithmetic unit sharply increases when moving than low speed, and surpasses fiducial value, and the signal that can detect rapidly from the base station of moving target etc.
And, in Rake receiver involved in the present invention, it is characterized in that path detection device comprises: arithmetic unit, by the intensity cumulative addition of the received signal of de-spread device institute de-spread and carry out equalization; Checkout gear, when the equalization result of this arithmetic unit surpassed the variable reference value, the timing that detects the escape character that uses this moment and de-spread in the de-spread device was used as being suitable for the escape character and regularly of the de-spread of received signal; And the translational speed that the detection sensitivity control device detects along with the translational speed checkout gear becomes at a high speed, and the variable reference value of checkout gear is reduced, and thus, improves above-mentioned detection sensitivity.
Rake receiver according to above-mentioned formation, under the situation of translational speed high speed, its value (variable reference value) from the input of communication counterpart descends, therefore, under the situation that the intensity of received signal increases when in high-speed mobile, compare the signal that can promptly detect from the base station of moving target etc. when moving with low speed.
And, in Rake receiver involved in the present invention, it is characterized in that, report the speed display device of the detected translational speed of translational speed checkout gear with comprising vision.
Like this, according to Rake receiver of the present invention, can be visually to the translational speed of this machine of user report.
In velocity checking circuits involved in the present invention, comprising: converting means, take a sample to received signal and be transformed to digital signal; Withdrawing device in the sampling by the digital signal of converting means institute conversion, takes out and the corresponding continuous a plurality of samplings of the indication of control signal; Extract position control out,, control the sampling that withdrawing device takes out changeably by control signal according to intensity by a plurality of samplings that this withdrawing device took out; Speed detector according to from extracting the control signal that position control is exported out, detects the translational speed of this machine.
In the velocity checking circuits of above-mentioned formation, converting means is taken a sample with for example per 1 chip, 8 bits, withdrawing device takes out the sampling of 3 for example continuous bits in above-mentioned 8 bits, be used as being used for being undertaken the digital signal of de-spread by a plurality of de-spread devices, extract the intensity of position control out according to the sampling of above-mentioned 3 bits, the extracting position of the sampling in the control withdrawing device, thus, along with the translational speed high speed, the intensity of 3 bits that taken out changes.Therefore, when the translational speed high speed, the control signal by extracting position control out is to the frequency gets higher of the control of withdrawing device.The present invention is conceived to this point, monitors this control frequency by the translational speed checkout gear, detects translational speed.
In the velocity checking circuits of above-mentioned formation, by with transducer diverse ways such as accelerometer that detects translational speed and gyro, can detect translational speed.
These and other purpose, advantage and feature of the present invention will be in conjunction with the drawings to the description of embodiments of the invention and further specified.In these accompanying drawings:
Fig. 1 is the circuit block diagram of formation of the Rake receiver of expression mobile communication terminal involved in the present invention;
Fig. 2 is the circuit block diagram of formation of the finger (3a) of expression Rake receiver shown in Figure 1;
Fig. 3 is the figure of sampling that is used to illustrate the A/D converter (1) of Rake receiver shown in Figure 1;
Fig. 4 is the figure that is used to illustrate the correction of the extraction position that the Delay Locked Loop circuit (35) by Rake receiver shown in Figure 1 is carried out;
Fig. 5 is used to illustrate the figure that the situation of part shortcoming takes place because of the influence of the decline of multipath from the wireless frequency signal of base station;
Fig. 6 is used to illustrate the figure that makes the situation that the eye opening degree of pilot signal dwindles owing to high-speed mobile;
Fig. 7 is the circuit block diagram of formation of the velocity checking circuits (36) of expression finger (3a) shown in Figure 2;
Fig. 8 is the circuit block diagram of formation of the shift register (361) of expression velocity checking circuits (36) shown in Figure 7;
Fig. 9 is the flow chart that the cell diversity when being used to Rake receiver handover shown in Figure 1 is described is handled action;
Figure 10 is the figure corresponding to the base station search order of the searcher of translational speed that is used to illustrate Rake receiver shown in Figure 1;
Figure 11 is the variable caused figure that is determined the variation of level Y (n) that forgets factor alpha that is used to illustrate by Rake receiver shown in Figure 1;
Figure 12 is the figure of difference of influence that is used to illustrate the multipath decline of CDMA mode and other communication mode;
Figure 13 is the circuit block diagram of formation of the Rake receiver of the existing mobile communication terminal of expression;
Figure 14 is used to illustrate along with the variation of the translational speed variation from the signal strength signal intensity of the base station B of moving target;
Figure 15 is that expression is during high-speed mobile and the figure of the difference of the detection position of the moving target base station of low speed when moving.
Come with reference to the accompanying drawings one embodiment of the present of invention are described.
Fig. 1 is the formation of the Rake receiver of the related mobile communication terminal of expression one embodiment of the present of invention.
Be received by antenna (not shown) from the RF signal that the base station sent, be transformed to baseband signal after, be transformed to digital signal by A/D converter (1), respectively inputted search portion (2) and demodulation section (3).A/D converter (1) as shown in Figure 3, is sampled as baseband signal the digital signal of per 1 chip, 8 bits.
Search section (2) is by searcher (2a)～(2c) form.The action of searcher (2a)～(2c) is carried out ON/OFF control by control part (5), use respectively by the escape character of the indicated kind of control part (5) and the timing of de-spread, to carrying out de-spread and demodulation from the digital signal of A/D converter (1), detect the level of demodulation result, be notified to control part (5).Kind by the indicated escape character of control part (5) is the escape character of distributing to the escape character of each base station and distributing to this machine.
Demodulation section (3) is by referring to that (finger) (3a)～(3d) forms.Refer to that (3a)～(3d) uses by control part (5) indicated escape character and timing, to carrying out de-spread and carry out demodulation from the digital signal of A/D converter (1), then, carries out correction process.And, refer to that (3a)～(3d) detects the level of the signal of demodulation respectively, be notified to control part (5).
Particularly, it is shown in Figure 2 to refer to that (3a) constitutes.The digital signal of 8 bits that A/D converter (1) is taken a sample at first is transfused to withdrawal device (decimeter) (31).Withdrawal device (31) extracts above-mentioned digital signal according to the position indicative signal from Delay Locked Loop (delay locked loop) circuit (35), selects the 3 continuous bits in 8 bits, exports to de-spread circuit (32) and Delay Locked Loop circuit (35).
De-spread circuit (32) uses the escape character that is generated by symbol generation circuit (33), with the timing of being notified by control part (5) digital signal of being imported from withdrawal device (31) is carried out de-spread, exports to error correction circuit (34).
Symbol generation circuit (33) generates the escape character by the indicated kind of control part (5).Error correction circuit (34) carries out correction process to the digital signal of having been carried out de-spread by de-spread circuit (32), and result is exported to combiner circuit (4).
Delay Locked Loop circuit (35) detects the deviation of the extraction position of withdrawal device (31), and the position indicative signal of proofreading and correct this deviation is exported to withdrawal device (31).
This position indicative signal is exported to velocity checking circuits (36).
At first, Delay Locked Loop circuit (35) monitors each level of the digital signal of 3 bits of being imported from withdrawal device (31).When the level of each bit shown in Fig. 4 (a) like that, under the big more situation, to withdrawal device (31) outgoing position index signal "+1 ", indication is staggered one towards the hysteresis direction and is extracted the position after leaning on more.
And, Delay Locked Loop circuit (35) when the level of each bit shown in Fig. 4 (b) like that, under the middle bigger situation, to withdrawal device (31) outgoing position index signal " 0 ", indication is extracted the position and is not staggered.
When the level of each bit shown in Fig. 4 (c) like that, under the more little situation, Delay Locked Loop circuit (35) is to withdrawal device (31) outgoing position index signal " 1 " after leaning on more, indication is staggered one towards leading direction and is extracted the position.
Velocity checking circuits (36) detects the translational speed of this mobile communication terminal according to the position indicative signal of being provided for withdrawal device (31) from Delay Locked Loop circuit (35).
Before the structure that the speed of explanation velocity checking circuits (36) detects, the relation of translational speed and position indicative signal is described.Shown in Fig. 5 (a) like that, be expanded to wide band wireless frequency signal from the base station is subjected to influence by the caused decline of multipath, and press shown in Fig. 5 (b) like that, produce part and be short of.
When high-speed mobile under this state, influence by the caused decline of multipath becomes significantly, it is big that distortion becomes, when low speed, the pilot signal that in a multipath that obtains the such eye opening degree shown in Fig. 6 (a), comprises, along with high-speed mobile, shown in Fig. 6 (b) like that, an eye opening degree diminishes.
Like this, when when the translational speed high speed opening degree being reduced, the change of extracting the position becomes acutely.Therefore, by the monitored position index signal, can detect the high speed of translational speed.
Fig. 7 represents the formation of velocity checking circuits (36).The position indicative signal of being imported from Delay Locked Loop circuit (35) is transfused to shift register (361).
Shift register (361), as shown in Figure 8,10 shift registers (3610)～(3619) are connected in series, therefore, by the dump clock signal synchronous with the output of position indicative signal, the position indicative signal that each register is stored to adjacent successively register output itself simultaneously, is exported to serial/parallel translation circuit (362).
Serial/parallel translation circuit (362) is exported to counter (363) being transformed to serial signal from the position indicative signal that register (3610)～(3619) are imported.
Counter (363) is counted the number of "+1 " and " 1 " that comprised 10 position indicative signals being imported from serial/parallel translation circuit (362), and count results is input in comparison circuit (364), (365).
Comparison circuit (364) compares above-mentioned count results and " 3 ", when surpassing " 3 ", to control part (5) output " 1 " data, when not surpassing " 3 ", to control part (5) output " 0 " data.
On the other hand, comparison circuit (365) compares above-mentioned count results and " 8 ", when surpassing " 8 ", to control part (5) output " 1 " data, when not surpassing " 8 ", to control part (5) output " 0 " data.
Therefore, be in almost " stopping " state following time at this mobile communication terminal, " 0 " data are all exported in comparison circuit (364), (365).And, be in " low speed moves " state following time at this mobile communication terminal, comparison circuit (364) output " 1 " data, comparison circuit (365) output " 0 " data.And, being in " high-speed mobile " state following time at this mobile communication terminal, " 1 " data are all exported in comparison circuit (364), (365).
That is, all export under " 0 " data conditions in comparison circuit (364), (365), the change of extracting the position is less, is judged as this mobile communication terminal and is in almost under " stopping " state.In comparison circuit (364) output " 1 " data, under comparison circuit (365) output " 0 " data conditions, be judged as mobile communication terminal and be in " low speed moves " state.
All export under " 1 " data conditions in comparison circuit (364), (365), the change of extracting the position is bigger, is judged as this mobile communication terminal and is under " high-speed mobile " state.
Like this, adopt velocity checking circuits (36),, can detect the translational speed of this mobile communication terminal with 3 ranks of " stopping ", " low speed moves ", " high-speed mobile " according to 10 position indicative signals.The data of being exported from comparison circuit (364), (365) are exported to control part (5) as translational speed information.
Combiner circuit (4) is exported to synthetic result the decoding circuit (not shown) of back level being synthesized by the signal that refers to the demodulation of (3a)～(3d) institute.
Control part (5) is given searcher (2a)～(2c) and is referred to that (3a)～(3d) distributes the kind of escape character and the timing of de-spread, simultaneously, monitors the signal level by the demodulation of searcher (2a)～(2c) and finger (3a)～(3d) notified.
Monitor the result according to this, switching controls is distributed to the control signal of finger (3a)～(3d) and the timing of de-spread, so that receive the higher path of incoming level, carries out path diversity.
Control part (5) is being lower than under the situation of predefined level by the level that refers to (3a)～(3d) notified, and the escape character in the path that obtains maximum level (finger) and de-spread timing allocation is given refer to (3a), and begins to carry out the cell diversity processing.
In this cell diversity was handled, control part (5) was by referring to the candidate base station of adjacent base station, base station (hereinafter referred to as base station A) that (3a) receives as moving target, and (2a)～(2c) distributes this escape character successively to searcher.
Thus, the level difference substitution following formula X (n) being notified successively by searcher (2a)～(2c) carries out cumulative addition, is transformed to respectively and is determined level Y (n).
And the Y (n-1) in following formula (1) is the previous calculated value of Y (n).And α forgets coefficient, by forgetting that coefficient control device (5c) carries out switching controls.
Y (N)=α X (N)+β Y (N-1) [formula 1]
(0＜α＜1，β＝(1-α))
Then, being determined averaging of level Y (n), monitor whether this equalization result surpasses predefined level (hereinafter referred to as switching threshold).
Surpass under the situation of switching threshold in the equalization result who is determined level Y (n), detect the base station (hereinafter referred to as base station B) that becomes moving target from the escape character of distributing to searcher (2a)～(2c) that becomes this calculating basis that is determined level Y (n).
Then, give the incoming level junior who refers in (3b)～(3d) timing allocation of the escape character of base station B and de-spread, make the base station that receives switch to B from A.
Control part (5), under the situation that detects base station B, control transmitting system (not shown) is to the base station B of A notice in base station as moving target.The base station A that receives this notice indicates to base station B: the signal of issuing this mobile communication terminal.
Control part (5) comprises translational speed decision maker (5a), searcher control device (5b) and forgets coefficient control device (5c), is used as new controlled function.
Translational speed decision maker (5a) is according to the translational speed information of being notified by velocity checking circuits (36), by the above-mentioned speed of judging this mobile communication terminal like that with 3 ranks of " stopping ", " low speed moves ", " high-speed mobile ".
Searcher control device (5b) carries out ON/OFF control according to the speed of being judged by translational speed decision maker (5a) to searcher (2a)～(2c).By this control, when " high-speed mobile ", make two searchers (2a), (2b) action.And, under the situation that is judged to be " stopping " state, only make searcher (2a) action.
Forget coefficient control device (5c) according to the speed of being judged by translational speed decision maker (5a), switching controls is forgotten the value of factor alpha.By this control, when " high-speed mobile ", make the value of forgetting factor alpha be " 0.8 ", when " low speed moves ", be " 0.5 ".Under the situation that is judged as " stopping " state, make the value of forgetting factor alpha be " 0.3 ".
Display part (6) is by carrying out for example LCD formations such as (LCD) that literal shows.Display part (6) can show the set condition that sends identification of targets numbering and this machine, can show the speed of this mobile communication terminal of being judged by above-mentioned translational speed decision maker (5a) with " stopping ", " low speed moves ", " high-speed mobile " 3 sections.
Cell diversity when using the flow chart of Fig. 9 that switching in the Rake receiver of above-mentioned formation is described is below handled action.
When being lower than predefined level by the level that refers to (3a)～(3d) notified, control part (5) begins to carry out cell diversity shown in Figure 9.At first, in step (9a), refer to (3a) giving by the escape character in the resulting path of level (finger) of the maximum in the level that refers to (3a)～(3d) notified and de-spread timing allocation.Thus, refer to that (3a) carries out the reception in path of the level of above-mentioned maximum.
In step (9b),, its escape character is distributed to searcher (2a)～(2c) successively the candidate base station of the base station adjacent as moving target with the base station A that receives by finger (3a).At this moment, searcher (2a)～(2c) moves control according to the speed of being judged by translational speed decision maker (5a) by searcher control device (5b).Thus, only the searcher that is in the operate condition is carried out the distribution of escape character.
The allocation order of in Figure 10, having represented " stopping ", " low speed moves ", " high-speed mobile " each state.In the example of Figure 10, the base station adjacent with base station A is eight of N1 to N8, and be 10[ms the search time that makes each base station].Under this state, when translational speed decision maker (5a) is judged to be " stopping " state, only searcher (2a) action.Thus, shown in Figure 10 (a) like that, the base station A that is using and other base station N1～N8 are alternately searched, therefore, to needing retrieval time of a circulation of all base stations of searching for 160[ms].
When translational speed decision maker (5a) is judged to be " low speed moves " state, searcher (2a), (2b) action, therefore, shown in Figure 10 (b) like that, the base station A that one of them searcher (2a) search is being used, another searcher (2b) is searched for other base station N1～N8, therefore, and to needing retrieval time of a circulation of all base stations of searching for 80[ms].
When translational speed decision maker (5a) is judged to be " high-speed mobile " state, searcher (2a), (2b), (2c) action, therefore, shown in Figure 10 (c) like that, the base station A that searcher (2a) search is being used, searcher (2b), (2c) search for other base station N1～N8 respectively, therefore, and to needing retrieval time of a circulation of all base stations of searching for 40[ms].
Then, in step (9c), the X (n) the level difference above-mentioned formula of being notified successively by searcher (2a)～(2c) of substitution (1) is transformed to respectively and is determined level Y (n).At this moment, employedly in formula (1) forget factor alpha, forget that coefficient control device (5c) carries out switching controls according to the speed result of determination of translational speed decision maker (5a).As described above, in this control, translational speed is high more, forgets that coefficient is big more, therefore, more approaching now in detected incoming level be reflected in and be determined among the level Y (n).
Whether the average result that is determined level Y (n) that supervision is in each searcher (2a)～(2c) in the operate condition surpasses switching threshold, under situation about not surpassing, move on to step (9b), the searcher (2a)～(2c) that is in the operate condition is carried out the distribution of other escape character.
Surpassing under the situation of switching threshold, move on to step (9d).In step (9d), from distribute to the escape character with the corresponding searcher of equalization result (2a)～(2c) that is determined level Y (n) that surpasses switching threshold, detect base station B.Then, give escape character and the de-spread timing that refers to that the incoming level junior distributes base station B in (3b)～(3d).
In step (9e), the control transmitting system is to the base station B of A notice in base station as moving target.In step (9f), checking refers to whether (3a)～(3d) all uses the escape character of identical base station.When not being when all being identical base station, be judged as to switch and do not finish to move on to step (9a), proceed cell diversity and handle.On the other hand, under the situation of the escape character that all uses identical base station, finish cell diversity and handle.
As described above, in Rake receiver of the present invention, detect translational speed,, make and forget that factor alpha becomes big, has improved the sensitivity that increases for the signal strength signal intensity from base station B along with detected translational speed high speed from the change of extracting the position.
Like this, as shown in Figure 11, in the switching threshold when identical high-speed mobile, for variation w0 in the equalization result who is determined level Y (n) who forgets being calculated under the certain situation of factor alpha, in Rake receiver of the present invention, make and forget that factor alpha becomes big, thus, be determined the equalization result's of level Y (n) the leading dt in forward position of variation W1.
That is, Rake receiver of the present invention when high-speed mobile, surpasses the timing advance of switching threshold, thus, can seek rapidization of the detection of base station B, and the call drop when suppressing to switch.
In Rake receiver of the present invention, along with the translational speed high speed, the quantity of the searcher that moves is increased, thus, under the situation that such path changes hardly when not mobile, there is not the situation that makes the more meaningless action of searcher.Otherwise path such when high-speed mobile changes under the violent situation, can make more searcher action.Like this, can alleviate consumed power along with path change corresponding to translational speed.
And, in Rake receiver of the present invention, under the situation of extracting continuous part sampling from the digital signal of being taken a sample by A/D converter (1) out, the position that is conceived to the sampling that adapts to extract phase changes along with high-speed mobile, goes out translational speed from the change-detection of this position.Like this, in Rake receiver of the present invention, do not need to be provided with separately transducers such as the accelerometer that detects translational speed and gyro, just can detect translational speed.
And, in Rake receiver of the present invention owing to can go up show detected translational speed at display part (6), can to user's vision notify the translational speed of this machine.
The present invention is not limited in the foregoing description.For example, in the above-described embodiments, in order to improve the sensitivity that increases for intensity, and, make and forget that factor alpha becomes big along with the translational speed high speed from the signal of base station B.But, also can replace it, for example,, set switching threshold lowlyer along with the translational speed high speed, also can improve the sensitivity that increases for intensity from the signal of base station B.
As described above, in the present invention, the translational speed of this machine of detecting, along with detected translational speed becomes at a high speed, raising is for the detection sensitivity of the intensity of the received signal of the de-spread of path detection device, therefore, and when this machine high-speed mobile, the detection sensitivity of received signal uprises, and can detect the signal from the communication counterpart platform rapidly.The Rake receiver of the call drop in the time of like this, can providing a kind of energy to suppress to switch.
And, in the present invention, detect the translational speed of this machine, along with detected translational speed becomes at a high speed, the amount of action of de-spread device is increased, therefore, when stopping and under the low speed situation that such path changes hardly when moving, only make the de-spread device action of minority.Otherwise, when high-speed mobile, under the violent situation of the change in such path, make more de-spread device action.That is, can provide a kind of Rake receiver, one side can change the corresponding consumed power that alleviates with the corresponding path of translational speed on one side.
And, in the present invention, a kind of Rake receiver and velocity checking circuits can be provided, under the situation of from the digital signal of sampling, extracting continuous part sampling out, detect translational speed from the change in location of the sampling that is suitable for extracting out, therefore, do not need to be provided with separately transducers such as the accelerometer that detects translational speed and gyro, just can detect translational speed.
And, in the present invention, can provide a kind of Rake receiver show the speed display device of the detected translational speed of translational speed checkout gear owing to comprise vision ground, and can to user's vision notify the translational speed of this machine.
Claims (7)
1. Rake receiver comprises:
Digital conversion device is transformed to digital signal to received signal;
A plurality of de-spread devices use the various escape characters of distributing to the communication counterpart platform successively, and the received signal that is transformed to digital signal by digital conversion device is carried out de-spread with various timings;
Path detection device monitors by the intensity of the received signal of this a plurality of de-spread device institute de-spread, detects the escape character of the de-spread that is suitable for received signal and the timing of de-spread;
A plurality of demodulating equipments use by detected escape character of above-mentioned path detection device and timing, carry out de-spread to received signal, and carry out demodulation;
Synthesizer, synthesizing by a plurality of received signals of above-mentioned a plurality of demodulating equipment institute demodulation,
It is characterized in that, also comprise:
The translational speed checkout gear detects the translational speed of this machine;
The detection sensitivity control device along with the detected translational speed of above-mentioned translational speed checkout gear becomes at a high speed, improves the detection sensitivity of path detection device to the intensity of the received signal of de-spread.
2. Rake receiver comprises:
Digital conversion device is transformed to digital signal to received signal;
A plurality of de-spread devices use the various escape characters of distributing to the communication counterpart platform successively, and the received signal that is transformed to digital signal by digital conversion device is carried out de-spread with various timings;
Path detection device monitors by the intensity of the received signal of this a plurality of de-spread device institute de-spread, detects the escape character of the de-spread that is suitable for received signal and the timing of de-spread;
A plurality of demodulating equipments use by detected escape character of above-mentioned path detection device and timing, carry out de-spread to received signal, and carry out demodulation;
Synthesizer, synthesizing by a plurality of received signals of above-mentioned a plurality of demodulating equipment institute demodulation,
It is characterized in that, also comprise:
The translational speed checkout gear detects the translational speed of this machine;
Motion control device along with the detected translational speed of above-mentioned translational speed checkout gear becomes at a high speed, increases the amount of action of above-mentioned a plurality of de-spread devices.
3. Rake receiver according to claim 1 and 2 is characterized in that, described digital conversion device comprises:
Converting means is taken a sample to received signal and is transformed to digital signal;
Withdrawing device in the sampling by the digital signal of above-mentioned converting means institute conversion, takes out and the corresponding continuous a plurality of samplings of the indication of control signal, is used as being used for being undertaken by a plurality of de-spread devices the digital signal of de-spread;
Extract position control out,, control the sampling that above-mentioned withdrawing device takes out changeably by control signal according to intensity by a plurality of samplings that above-mentioned withdrawing device took out;
And above-mentioned translational speed checkout gear detects the translational speed of this machine according to the control signal of being exported from above-mentioned extraction position control.
4. according to claim 1 or 3 described Rake receivers, it is characterized in that described path detection device comprises:
Arithmetic unit, intensity cumulative addition by the received signal of above-mentioned de-spread device institute de-spread, when this cumulative addition, carry out addition the intensity of cumulative addition in the past with by the intensity of the new received signal of above-mentioned de-spread device institute de-spread with the ratio corresponding with variable value α;
Checkout gear, when the cumulative addition result of above-mentioned arithmetic unit surpassed predefined fiducial value, the timing that detects the escape character that uses this moment and de-spread was used as being suitable for the escape character and regularly of the de-spread of received signal;
And the translational speed that above-mentioned detection sensitivity control device detects along with the translational speed checkout gear becomes at a high speed, and control variable value α, so that the ratio that arithmetic unit improves by the intensity of the new received signal of de-spread device institute de-spread carries out cumulative addition, thereby improve above-mentioned detection sensitivity.
5. according to claim 1 or 3 described Rake receivers, it is characterized in that described path detection device comprises:
Arithmetic unit is by the intensity cumulative addition of the received signal of above-mentioned de-spread device institute de-spread and carry out equalization;
Checkout gear, when the equalization result of above-mentioned arithmetic unit surpassed the variable reference value, the timing that detects the escape character that uses this moment and de-spread in the de-spread device was used as being suitable for the escape character and regularly of the de-spread of received signal;
And the translational speed that above-mentioned detection sensitivity control device detects along with above-mentioned translational speed checkout gear becomes at a high speed, and the variable reference value of above-mentioned detection device is reduced, and thus, improves above-mentioned detection sensitivity.
6. according to each described Rake receiver of claim 1 to 5, it is characterized in that, report the speed display device of the detected translational speed of above-mentioned translational speed checkout gear with comprising vision.
7. velocity checking circuits comprises:
Converting means is taken a sample to received signal and is transformed to digital signal;
Withdrawing device in the sampling by the digital signal of above-mentioned converting means institute conversion, takes out and the corresponding continuous a plurality of samplings of the indication of control signal;
Extract position control out,, control the sampling that above-mentioned withdrawing device takes out changeably by control signal according to intensity by a plurality of samplings that above-mentioned withdrawing device took out;
Speed detector according to the control signal of being exported from above-mentioned extraction position control, detects the translational speed of this machine.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2511171/1998 | 1998-09-04 | ||
| JP25111798A JP2000083010A (en) | 1998-09-04 | 1998-09-04 | Rake receiver and speed detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1253420A true CN1253420A (en) | 2000-05-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99118386A Pending CN1253420A (en) | 1998-09-04 | 1999-09-03 | Rayke receiver and speed detecting circuit |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2000083010A (en) |
| CN (1) | CN1253420A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI20000700A (en) * | 2000-03-24 | 2001-09-25 | Nokia Mobile Phones Ltd | Mobile phone with improved power saving feature |
| US7123916B2 (en) | 2000-07-25 | 2006-10-17 | Denso Corporation | Handoff adaptation for CDMA systems |
| JP3560950B2 (en) * | 2001-12-07 | 2004-09-02 | エヌ・ティ・ティ・アドバンステクノロジ株式会社 | Self-propelled control device, its control method, and self-propelled device |
| JP3642483B2 (en) | 2002-01-09 | 2005-04-27 | 日本電気株式会社 | Wireless mobile station and wireless communication system including the same |
| KR100548320B1 (en) | 2002-12-31 | 2006-02-02 | 엘지전자 주식회사 | Apparatus and method for allocating searching resource in base station modem |
| CN100361413C (en) * | 2004-06-03 | 2008-01-09 | 电子科技大学 | De-spread method of direct sequence spread-spectrum signal |
| DE602006020157D1 (en) * | 2005-11-02 | 2011-03-31 | Nec Corp | MOBILE DEVICE, MOBILE SPEED PROCESSING METHOD AND PROGRAM THEREFOR |
| CN103209450A (en) * | 2012-01-11 | 2013-07-17 | 华为技术有限公司 | Method for obtaining movement speed of mobile terminal, base station and terminal |
-
1998
- 1998-09-04 JP JP25111798A patent/JP2000083010A/en active Pending
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1999
- 1999-09-03 CN CN99118386A patent/CN1253420A/en active Pending
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| JP2000083010A (en) | 2000-03-21 |
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