CN100352178C - Method for improving user device channel estimating performance - Google Patents
Method for improving user device channel estimating performance Download PDFInfo
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- CN100352178C CN100352178C CNB2005101259635A CN200510125963A CN100352178C CN 100352178 C CN100352178 C CN 100352178C CN B2005101259635 A CNB2005101259635 A CN B2005101259635A CN 200510125963 A CN200510125963 A CN 200510125963A CN 100352178 C CN100352178 C CN 100352178C
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Abstract
The present invention discloses a method for improving user device channel estimating performance, which can be applied to a digital mobile communication system of adopting the technology of an intelligent antenna. The present invention comprises the following steps that a user device utilizes a base station and service channel pilot frequencies or intermediate code signals both known by both sides of a user device to carry out channel estimation to a downlink service channel; whether the quality of downlink service channel pilot frequencies is worsened can be detected; if the result is negative, the estimated result of the downlink service channel can be provided to a detecting module of the user device for detecting; if the result is positive, the user device can carry out channel estimation to a downlink common channel, and the estimated result of the downlink common channel can be provided to the detecting module of the user device for detecting. The present invention can obviously enhance the accuracy and the fault tolerance of the channel estimation of the user device, and the demodulation property of the user device and the system robustness can be enhanced.
Description
Technical field
The present invention relates to the digital mobile communication field, especially relate to a kind of method that in the communication system that adopts smart antenna, improves user device channel estimating performance.
Background technology
In the modern digital mobile communication system, under the situation that adopts smart antenna, the base station utilizes Bo Dajiao (the Direction of Arrival of the signal estimated signal of reverse link traffic channel, DOA), and according to this ripple reach the angle by the figuration mode with the signal energy of downlink traffic channel to subscriber equipment (User Equipment, UE) direction radiation, the signal energy that is downlink traffic channel can be by figuration angle (Direction of Travel, DOT) direction is carried out radiation to subscriber equipment, can obtain the signal gain of higher downlink traffic channel like this with regard to subscriber equipment.In order to improve the signal figuration gain of downlink traffic channel, ordinary circumstance is used the downlink traffic channel signal beam of narrower in width, following problem will certainly take place like this, if promptly the base station reaches the angle to ripple and estimates wrong, then the base station will be at the signal of the direction radiation downlink traffic channel of mistake, the useful signal that subscriber equipment receives is the energy of downlink forming direction external leakage, and downlink signal quality is variation thereupon.And the user device channel estimation is very responsive to the downstream signal intensity and the downlink signal quality that receive, under the situation that base station down figuration direction is made mistakes, probably from downlink traffic channel, search for, thereby make the subscriber equipment end not have enough energy demodulation less than effective multipath.
If signal strength signal intensity deficiency or signal to noise ratio do not reach the requirement thresholding, subscriber equipment is difficult to channel impulse response is estimated, and causes the mistake of channel estimating.Though the follow-up joint-detection of channel estimating is disturbed under the main situation from other users at downstream signal, has stronger robustness, can suppress other users than strong jamming, the result of channel estimating but joint-detection places one's entire reliance upon, if above-mentioned channel estimation error, subscriber equipment just exists difficulty on joint-detection, the demodulation performance of so whole downstream signal is with rapid deterioration.
In addition, the estimation accuracy that the signal wave of reverse link traffic channel reaches the angle also has certain restriction, and simulation result shows that under the situation of operate as normal the probability that ripple reaches the angle misjudgment may reach 2～4%.As seen, the mistake that the signal wave of reverse link traffic channel is reached the angle in the base station is estimated to cause under the situation of signal figuration angle mistake of downlink traffic channel, the fault-tolerance that how to improve the user device channel estimation is a very crucial problem, also is the bottleneck that improves the demodulation performance of downstream signal.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of method that improves user device channel estimating performance, adopt the present invention can significantly improve accuracy and fault-tolerance that user device channel is estimated, strengthen the robustness of subscriber equipment demodulation performance and system.
In order to solve the problems of the technologies described above, the invention provides a kind of method that improves user device channel estimating performance, be applied to adopt in the digital mobile communication system of intelligent antenna technology, comprise the steps:
(a1) subscriber equipment utilizes base station and subscriber equipment both sides signal in common knowledge that downlink traffic channel is carried out channel estimating, and whether the quality that detects downlink traffic channel causes deterioration because of the figuration angle mistake of downlink traffic channel signal, if not, execution in step (a2), if, execution in step (a3);
(a2) the downlink traffic channel results estimated is provided to the detection module of subscriber equipment and detect process ends;
(a3) subscriber equipment carries out channel estimating to common down channel, and the common down channel results estimated provided to the detection module of subscriber equipment detects.
Further, the present invention also has following characteristics: described digital mobile communication system is for adopting the Wideband Code Division Multiple Access (WCDMA) communication system of intelligent antenna technology, and employed base station and subscriber equipment both sides signal in common knowledge is the Traffic Channel pilot code in the step (a1).
Further, the present invention also has following characteristics: described digital mobile communication system is for adopting the CDMA2000 communication system of intelligent antenna technology, and employed base station and subscriber equipment both sides signal in common knowledge is the Traffic Channel pilot code in the step (a1).
Further, the present invention also has following characteristics: described digital mobile communication system is for adopting the time division synchronous code division multiple access communication system of intelligent antenna technology, and employed base station and subscriber equipment both sides signal in common knowledge is an intermediate code in the step (a1).
Further, the present invention also has following characteristics: the determination methods whether quality of described detection downlink traffic channel worsens is that subscriber equipment judges whether to detect the footpath, if detect the footpath, shows that channel conditions is good, otherwise, show channel degradation.
Further, the present invention also has following characteristics: to be subscriber equipment detect the received power of Traffic Channel the determination methods whether quality of described detection downlink traffic channel worsens, set the received power thresholding, and judge whether received power is higher than this thresholding, if, show that channel conditions is good, otherwise, channel degradation shown.
Further, the present invention also has following characteristics: to be subscriber equipment detect the signal to noise ratio of downlink traffic channel the determination methods whether quality of described detection downlink traffic channel worsens, set signal-noise ratio threshold, and judge whether signal to noise ratio is higher than this thresholding, if, show that channel conditions is good, otherwise, channel degradation shown.
Further, the present invention also has following characteristics: the detection module of described subscriber equipment is the joint-detection module.
In order to solve the problems of the technologies described above, the present invention also provides a kind of method that improves user device channel estimating performance, is applied to adopt the digital mobile communication system of intelligent antenna technology, comprises the steps:
(b1) subscriber equipment utilizes base station and subscriber equipment both sides signal in common knowledge that downlink traffic channel is carried out channel estimating, and whether the quality that detects downlink traffic channel causes deterioration because of the figuration angle mistake of downlink traffic channel signal, if not, execution in step (b2), if, execution in step (b3);
(b2) the downlink traffic channel results estimated is provided to the detection module of subscriber equipment and detect process ends;
(b3) subscriber equipment detects the quality of common down channel, the setting power strength threshold, whether the power level of judging common down channel is higher than this setting thresholding, if, then subscriber equipment carries out channel estimating to common down channel, and the common down channel results estimated provided to the detection module of subscriber equipment detects.
In order to solve the problems of the technologies described above, the present invention provides a kind of method that improves user device channel estimating performance again, is applied to adopt the digital mobile communication system of intelligent antenna technology, comprises the steps:
(c1) subscriber equipment utilizes base station and subscriber equipment both sides signal in common knowledge that downlink traffic channel is carried out channel estimating, and whether the quality that detects downlink traffic channel causes deterioration because of the figuration angle mistake of downlink traffic channel signal, if not, execution in step (c2), if, execution in step (c3);
(c2) the downlink traffic channel results estimated is provided to the detection module of subscriber equipment and detect process ends;
(c3) subscriber equipment detects the quality of common down channel, set signal-noise ratio threshold, whether the signal to noise ratio of judging common down channel is higher than this setting thresholding, if, then subscriber equipment carries out channel estimating to common down channel, and the common down channel results estimated provided to the detection module of subscriber equipment detects.
Compared with prior art, the present invention has the following advantages: when figuration angle mistake causes the downlink traffic channel signal quality deteriorates, subscriber equipment utilizes the channel estimation results of common down channel to replace the channel estimation results of downlink traffic channel to carry out the joint-detection of subscriber equipment, accuracy and fault-tolerance that user device channel is estimated have been significantly improved, strengthen the robustness of subscriber equipment demodulation performance and system, reduced cutting off rate.
Description of drawings
Fig. 1 is that the base station utilizes smart antenna to adopt the schematic diagram of shaping method in mobile communication system;
Fig. 2 is a kind of flow chart that improves the user device channel estimating performance method of the present invention.
Embodiment
For understanding the present invention in depth, the present invention is described in detail below in conjunction with drawings and the specific embodiments.
In current digital mobile communication system, the base station can utilize smart antenna to make subscriber equipment obtain figuration gain to improve the demodulation performance of subscriber equipment by the figuration mode, as shown in Figure 1, the base station need obtain the direction of the signal arrival antenna of subscriber equipment emission before figuration, be the Bo Dajiao of reverse link traffic channel signal, the base station reaches the transmit direction that the downlink traffic channel signal of subscriber equipment is determined to issue in the angle according to this ripple then, i.e. figuration angle, and on this direction to user's radiation signal.According to the reciprocal characteristic of channel, it is identical with the figuration angle that ripple reaches the angle.When the base station reaches the angle misjudgment to ripple and causes figuration angle mistake, the downlink traffic channel signal that subscriber equipment receives is the part signal of the signal of radiation on the figuration angular direction to external leakage, so the signal quality deteriorates that subscriber equipment receives directly influences the estimation of subscriber equipment to channel.The deterioration performance of signal quality comprises following several situation, and subscriber equipment detects less than the footpath, and signal strength weakening and signal to noise ratio reduce.
The downstream signal that subscriber equipment can receive includes common down channel signal and downlink traffic channel signal.Wherein the common down channel signal be the base station to whole cell range radiation, the signal radiation direction of certain subscriber equipment is not made special figuration, so in whole cell coverage area, can receive the signal of reliable down common signal channel.The mistake that the signal wave of reverse link traffic channel is reached the angle in the base station is estimated under the situation of the signal figuration angle of the downlink traffic channel that leads to errors so that downlink traffic channel deterioration, because common down channel does not have figuration, still can keep certain signal quality, therefore subscriber equipment can carry out channel estimating to common down channel, and replace the channel estimation results of downlink traffic channel to offer subsequent module the channel estimation results of common down channel handling accordingly, thereby help to improve the user device channel estimation performance.
Subscriber equipment carries out normal communication process, need utilize the result of channel estimating that channel is compensated, channel estimating then needs to utilize the signal that both sides know altogether between a base station and the subscriber equipment to carry out, and the two signals of knowing altogether of sending out of this transmitting-receiving can be the Traffic Channel pilot code in Wideband Code Division Multiple Access (WCDMA) (WCDMA) communication system or CDMA2000 communication system; In TD SDMA (TD-SCDMA) communication system, can be intermediate code (midamble sign indicating number).
As shown in Figure 2, TD-SCDMA communication system with the employing intelligent antenna technology is an example, and the detection module of subscriber equipment is for carrying out the joint-detection module of joint-detection to signal, present embodiment is implemented in the channel estimation results that the channel estimating of utilizing common down channel under the situation of downlink traffic channel deterioration replaces Traffic Channel, to improve the process of user device channel estimating performance, comprise the steps:
Step 10, beginning this method;
Step 11, subscriber equipment utilize the intermediate code that receiving-transmitting sides is known altogether between base station and the subscriber equipment that downlink traffic channel is carried out footpath detection and channel estimating;
Step 12 judges whether detect the footpath in downlink traffic channel, if, execution in step 14, otherwise, execution in step 13;
Step 13, subscriber equipment carries out channel estimating to common down channel, and with the channel estimation results of this common down channel results estimated as downlink traffic channel;
Step 14 offers the joint-detection module with the channel estimating of downlink traffic channel and carries out joint-detection, and follow-up demodulation coding module is deciphered.
A kind of conversion as the embodiment of the invention, the whether deterioration method of quality of judging downlink traffic channel can be subscriber equipment the received power of Traffic Channel is detected, judge whether received power is higher than the received power threshold value that presets, if, show that downlink traffic channel in order, subscriber equipment provides the channel estimating of downlink traffic channel to the joint-detection module and carries out joint-detection, and follow-up demodulation coding module is deciphered, otherwise, show that downlink traffic channel worsens, subscriber equipment carries out channel estimating to common down channel, and this common down channel results estimated is offered the joint-detection module carry out joint-detection, and follow-up demodulation coding module is deciphered.
A kind of conversion as the embodiment of the invention, the whether deterioration method of quality of judging downlink traffic channel can be subscriber equipment the signal to noise ratio of downlink traffic channel is detected, judge whether signal to noise ratio is higher than the signal-noise ratio threshold value that presets, if, show that downlink traffic channel in order, subscriber equipment provides the channel estimating of downlink traffic channel to the joint-detection module and carries out joint-detection, and follow-up demodulation coding module is deciphered, otherwise, show that downlink traffic channel worsens, subscriber equipment carries out channel estimating to common down channel, and this common down channel results estimated is offered the joint-detection module carry out joint-detection, and follow-up demodulation coding module is deciphered.
A kind of conversion as the embodiment of the invention, adopting the common down channel estimation to replace between the downlink traffic channel estimation, subscriber equipment also can detect the quality of common down channel, judge that whether the power level of common down channel or signal to noise ratio are greater than the respective threshold that presets, if greater than, then subscriber equipment carries out channel estimating to common down channel, and this common down channel results estimated is offered the joint-detection module carry out joint-detection, and follow-up demodulation coding module is deciphered.
The channel estimation results that utilizes common signal channel of the present invention is applicable to the figuration angle mistake caused situation of the deterioration of downlink traffic channel by the downlink traffic channel signal as the method for the channel estimation results of Traffic Channel, and inapplicable downlink traffic channel deterioration is by the channel caused situation of suddenling change.Because the sudden change of channel will cause that simultaneously downlink traffic channel quality and common down channel quality descend, and figuration angle mistake only can cause the decline of downlink traffic channel quality, so under the situation of figuration angle mistake, still can utilize common down channel to carry out channel estimating, to improve the descending quality of reception.
Claims (10)
1, a kind of method that improves user device channel estimating performance is applied to adopt the digital mobile communication system of intelligent antenna technology, comprises the steps:
(a1) subscriber equipment utilizes base station and subscriber equipment both sides signal in common knowledge that downlink traffic channel is carried out channel estimating, and whether the quality that detects downlink traffic channel causes deterioration because of the figuration angle mistake of downlink traffic channel signal, if not, execution in step (a2), if, execution in step (a3);
(a2) the downlink traffic channel results estimated is provided to the detection module of subscriber equipment and detect process ends;
(a3) subscriber equipment carries out channel estimating to common down channel, and the common down channel results estimated provided to the detection module of subscriber equipment detects.
2, a kind of method that improves user device channel estimating performance according to claim 1, it is characterized in that: described digital mobile communication system is for adopting the Wideband Code Division Multiple Access (WCDMA) communication system of intelligent antenna technology, and employed base station and subscriber equipment both sides signal in common knowledge is the Traffic Channel pilot code in the step (a1).
3, a kind of method that improves user device channel estimating performance according to claim 1, it is characterized in that: described digital mobile communication system is for adopting the CDMA2000 communication system of intelligent antenna technology, and employed base station and subscriber equipment both sides signal in common knowledge is the Traffic Channel pilot code in the step (a1).
4, a kind of method that improves user device channel estimating performance according to claim 1, it is characterized in that: described digital mobile communication system is for adopting the time division synchronous code division multiple access communication system of intelligent antenna technology, and employed base station and subscriber equipment both sides signal in common knowledge is an intermediate code in the step (a1).
5, according to any improves the method for user device channel estimating performance in the claim 2,3 or 4, it is characterized in that: whether the quality of described detection downlink traffic channel causes that because of the figuration angle mistake of downlink traffic channel signal the determination methods of deterioration is that subscriber equipment judges whether to detect the footpath, if detect the footpath, show that channel conditions is good, otherwise, show channel degradation.
6, according to any improves the method for user device channel estimating performance in the claim 2,3 or 4, it is characterized in that: whether the quality of described detection downlink traffic channel causes that because of the figuration angle mistake of downlink traffic channel signal the determination methods of deterioration is subscriber equipment the received power of Traffic Channel is detected, set the received power thresholding, and judge whether received power is higher than this thresholding, if, show that channel conditions is good, otherwise, channel degradation shown.
7, according to any improves the method for user device channel estimating performance in the claim 2,3 or 4, it is characterized in that: whether the quality of described detection downlink traffic channel causes that because of the figuration angle mistake of downlink traffic channel signal the determination methods of deterioration is subscriber equipment the signal to noise ratio of downlink traffic channel is detected, set signal-noise ratio threshold, and judge whether signal to noise ratio is higher than this thresholding, if, show that channel conditions is good, otherwise, channel degradation shown.
8, according to any improves the method for user device channel estimating performance in the claim 2,3 or 4, it is characterized in that: the detection module of described subscriber equipment is the joint-detection module.
9, a kind of method that improves user device channel estimating performance is applied to adopt the digital mobile communication system of intelligent antenna technology, comprises the steps:
(b1) subscriber equipment utilizes base station and subscriber equipment both sides signal in common knowledge that downlink traffic channel is carried out channel estimating, and whether the quality that detects downlink traffic channel causes deterioration because of the figuration angle mistake of downlink traffic channel signal, if not, execution in step (b2), if, execution in step (b3);
(b2) the downlink traffic channel results estimated is provided to the detection module of subscriber equipment and detect process ends;
(b3) subscriber equipment detects the quality of common down channel, the setting power strength threshold, whether the power level of judging common down channel is higher than this setting thresholding, if, then subscriber equipment carries out channel estimating to common down channel, and the common down channel results estimated provided to the detection module of subscriber equipment detects.
10, a kind of method that improves user device channel estimating performance is applied to adopt the digital mobile communication system of intelligent antenna technology, comprises the steps:
(c1) subscriber equipment utilizes base station and subscriber equipment both sides signal in common knowledge that downlink traffic channel is carried out channel estimating, and whether the quality that detects downlink traffic channel causes deterioration because of the figuration angle mistake of downlink traffic channel signal, if not, execution in step (c2), if, execution in step (c3);
(c2) the downlink traffic channel results estimated is provided to the detection module of subscriber equipment and detect process ends;
(c3) subscriber equipment detects the quality of common down channel, set signal-noise ratio threshold, whether the signal to noise ratio of judging common down channel is higher than this setting thresholding, if, then subscriber equipment carries out channel estimating to common down channel, and the common down channel results estimated provided to the detection module of subscriber equipment detects.
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| JPWO2008108231A1 (en) * | 2007-02-26 | 2010-06-10 | 日本電気株式会社 | Quality degradation location estimation method, quality degradation location estimation apparatus, and program |
| CN102970697B (en) * | 2011-09-01 | 2015-03-18 | 鼎桥通信技术有限公司 | Exception detection method and device |
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| EP1330048A1 (en) * | 2001-12-28 | 2003-07-23 | Nokia Corporation | Method of estimating downlink channel, and user equipment |
| CN1483250A (en) * | 2000-12-29 | 2004-03-17 | ��˹��ŵ�� | Parameter estimation for adaptive antenna system |
| WO2004040869A1 (en) * | 2002-10-30 | 2004-05-13 | Koninklijke Philips Electronics N.V. | Methods for channel estimation in the presence of transmit beamforming |
| EP1480350A1 (en) * | 2003-05-19 | 2004-11-24 | Telefonaktiebolaget LM Ericsson (publ) | Determination of a channel estimate of a transmission channel |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1483250A (en) * | 2000-12-29 | 2004-03-17 | ��˹��ŵ�� | Parameter estimation for adaptive antenna system |
| EP1330048A1 (en) * | 2001-12-28 | 2003-07-23 | Nokia Corporation | Method of estimating downlink channel, and user equipment |
| WO2004040869A1 (en) * | 2002-10-30 | 2004-05-13 | Koninklijke Philips Electronics N.V. | Methods for channel estimation in the presence of transmit beamforming |
| EP1480350A1 (en) * | 2003-05-19 | 2004-11-24 | Telefonaktiebolaget LM Ericsson (publ) | Determination of a channel estimate of a transmission channel |
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| 一种新的WCDMA下行链路信道参数估计方法 盛彬，尤肖虎.应用科学学报，第20卷第3期 2002 * |
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