CN101931597B - Channel estimation window determining method and device - Google Patents
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Abstract
The invention discloses a channel estimation window determining method and a channel estimation window determining device. The method comprises the following steps of: setting a peak detection threshold; detecting a detection domain of a first channel estimation domain according to the peak detection threshold and acquiring the position of a target peak; adjusting a data sequence of the first channel estimation domain according to the position of the target peak and acquiring a second channel estimation domain; and acquiring the channel estimation window at a set position of the second channel estimation domain. By adopting the channel estimation window determining method and the channel estimation window determining device, offset CIR can be acquired and the CIR position and data close to the position are moved to the position of the channel estimation domain of the traditional cell transmission power adjustment method. Therefore, the CIR can be accurately intercepted by acquiring the channel estimation window at the set position of the adjusted channel estimation domain and the accuracy of a channel estimation result can be improved.
Description
Technical field
The present invention relates to mobile communication technology, particularly relate to a kind of channel estimation window and determine method and apparatus.
Background technology
In mobile communication system, the method of adjustment of traditional cell transmit power is to carry out drive test by terminal in a plurality of minizones, obtain received signal code power (RSCP) and the Interference Signal Code Power (ISCP) of the whole network, again according to test result and target call, radio transmission power to Primary Common Control Physical Channel (P-CCPCH) is adjusted, to keep broadcasting power in rational scope, both avoided because the excessive presence of intercell interference that causes of P-CCPCH power is avoided again the too small poor signal quality that causes of power.
The method of adjustment of traditional cell transmit power is to adopt the corresponding base station of a terminal, sends Um interface timeslot by the base station to terminal and carries out drive test.Fig. 1 is the Um interface timeslot structural representation of the method for adjustment of traditional cell transmit power.As shown in Figure 1, the Um interface timeslot of the method for adjustment of traditional cell transmit power comprises: 2 length are the data field of 352 chips (chips), 1 training sequence territory (Midamlbe) and 1 protected field (GP) that length is 16chips that length is 144chips.
In the method for adjustment of traditional cell transmit power, adopt a terminal to carry out drive test in each residential quarter in a plurality of residential quarters.Fig. 2 is the training sequence schematic diagram of the method for adjustment of traditional cell transmit power.Whole training sequence is produced by 3 basic training sequences (BasicMidamble) cascade, and different terminals is used respectively the different sections in this integral body training sequence.As shown in Figure 2, K is terminal serial number, and the training sequence that the terminal of K=1 is used is to be 240 to 383 one section from the code sequence number, altogether 144chips.Being used for channel estimating at receiver section is to be 255 to 383 one section with the code sequence number.The training sequence that different user uses is the different sections in this integral body training sequence, and sequence offset is different.
In the method for adjustment of traditional cell transmit power, rear 128 chips among 144 chips of channel estimating position use training sequence, the deviation post of the employed training sequence of each terminal in whole training sequence determined when being the terminal distribution resource, so the training sequence that each terminal is used can be known in the base station of network side.In the method for adjustment of traditional cell transmit power, definite method of channel estimation window is, adopt in advance rear 128 chips in 144 chips of training sequence as channel estimation domain, with the desired location in the channel estimation domain as channel estimation window.The condition that this desired location need to satisfy is, the deviation post of the training sequence that uses according to each known terminal is included in this desired location channel estimating peak value (CIR).
Because the method for adjustment of traditional cell transmit power adopts the detection mode of the corresponding base station of a terminal, the accuracy that path loss calculates is low, in order to address this problem, the method for adjustment of the cell transmit power of reverse coverage test has been proposed in mobile communication system.
Oppositely the method for adjustment of the cell transmit power of coverage test adopts the corresponding a plurality of base stations of a terminal to carry out drive test, and terminal transmits and a plurality of base station receives simultaneously.Calculate path loss between terminal and each base station according to the transmitting power of terminal and the received power of each base station.Receive the RSCP of P-CCPCH according to the current P-CCPCH power calculation terminal of circuit loss value and residential quarter, if RSCP crosses low then increases P-CCPCH power, otherwise then reduce P-CCPCH power.
Oppositely the method for adjustment of the cell transmit power of coverage test adopts a terminal to send, and a plurality of base stations receive simultaneously, has therefore improved the accuracy that path loss calculates.Fig. 3 is the Um interface timeslot structural representation of method of adjustment of the cell transmit power of reverse coverage test.As shown in Figure 3; oppositely the Um interface timeslot of the cell transmit power of coverage test comprises: 1 length is the data field of 352chips, 2 training sequence territories and 2 protected fields; concrete; 2 training sequence territories comprise: length is the first training sequence territory of 144chips and the second training sequence territory that length is 128chips, and 2 protected fields comprise: length is the first protected field of 16chips and the second protected field that length is 224chips.
Comprised important channel information in the training sequence.Because oppositely the distance of user and base station will be considerably beyond the coverage distance of tradition covering, so in order to guarantee enough channel delay, training sequence is expanded in the coverage test.Adopt the method for adjustment of the cell transmit power of reverse coverage test, physical layer parameter does not need the high-level signaling configuration, and is made an appointment by terminal and base station.Specific information field has been carried in the data symbol territory, can decode and obtain the useful information of terminal in the base station of network side.
Fig. 4 is the training sequence schematic diagram of method of adjustment of the cell transmit power of reverse coverage test.As shown in Figure 4, adopt the method for adjustment of the cell transmit power of reverse coverage test, training sequence comprises the first training sequence and the second training sequence, and wherein, the second training sequence is 128 chips of postponing to the right on the basis of the first training sequence.
When adopting reverse coverage test method, terminal is different from distance between each base station, and the time delay that is therefore produced by distance is different.In the reverse coverage test method shown in Figure 4 training sequence is expanded, be its objective is to guarantee enough channel delay.Owing to comparing with the method for adjustment of traditional cell transmit power, distance when adopting the method for reverse coverage test between terminal and the base station is usually farther, therefore in the channel estimation results of the reverse method of coverage test, channel delay increases, CIR generally moves to right, the desired location of the channel estimation window in the method for adjustment of traditional cell transmit power might be shifted out, even the position in second training sequence shown in Figure 4 might be moved into.Therefore, if still adopt the method for determining channel estimation window in the method for adjustment of traditional cell transmit power, desired location as channel estimation window, can't be truncated to CIR exactly, the accuracy of channel estimation results is low.
Summary of the invention
The invention provides a kind of channel estimation window and determine method, adopt the method can improve the accuracy of channel estimation results.
The present invention also provides a kind of channel estimation window to determine device, adopts this device can improve the accuracy of channel estimation results.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses a kind of channel estimation window and determine method, comprising:
The peak detection threshold is set;
Detect the detection territory of the first channel estimation domain according to described peak detection threshold, the position that obtains target peak;
Adjust the data order of described the first channel estimation domain according to the position of described target peak, obtain the second channel estimation domain;
Desired location in described second channel estimation domain obtains channel estimation window.
The described peak detection threshold that arranges comprises:
Detect described the first channel estimation domain, obtain the position of peak-peak and the described peak-peak of described the first channel estimation domain;
Calculate the peak-to-average force ratio of maximum peak according to described peak-peak;
Peak-to-average force ratio according to described maximum peak calculates described peak detection threshold.
Described peak-to-average force ratio according to described maximum peak calculates described peak detection threshold, comprising:
According to
Calculate described peak detection threshold;
Wherein, PAR
AimBe the peak detection threshold, n is threshold parameter, P
MaxBe peak-peak.
The described detection territory of detecting the first channel estimation domain according to described peak detection threshold, the position that obtains target peak comprises:
Appointment in the left side, position of the peak-peak of described the first channel estimation domain detects in the length, obtains from left to right first peak-to-average force ratio more than or equal to the position at the peak of described peak detection threshold.
Described second channel estimation domain comprises successively from starting point:
Data before data after the position of the described target peak in the data of the position of the described target peak in described the first channel estimation domain, described the first channel estimation domain and the position of the described target peak in described the first channel estimation domain.
The invention also discloses a kind of channel estimation window and determine device, comprising:
Detection threshold unit, peak is used for arranging the peak detection threshold;
The target peak unit is for the detection territory of detecting the first channel estimation domain according to described peak detection threshold, the position that obtains target peak;
The channel estimation domain unit, the data order for adjust described the first channel estimation domain according to the position of described target peak obtains the second channel estimation domain;
The channel estimating window unit is used for obtaining channel estimation window at the desired location of described second channel estimation domain.
Detection threshold unit, described peak obtains the position of peak-peak and the described peak-peak of described the first channel estimation domain specifically for detection of described the first channel estimation domain; Calculate the peak-to-average force ratio of maximum peak according to described peak-peak; Peak-to-average force ratio according to described maximum peak calculates described peak detection threshold.
The concrete basis in detection threshold unit, described peak
Calculate described peak detection threshold, wherein, PAR
AimBe the peak detection threshold, n is threshold parameter, P
MaxBe peak-peak.
Described target peak unit specifically is used for detecting in the length in the appointment in the left side, position of the peak-peak of described the first channel estimation domain, obtains from left to right first peak-to-average force ratio more than or equal to the position at the peak of described peak detection threshold.
Described second channel estimation domain comprises successively from starting point:
Data before data after the position of the described target peak in the data of the position of the described target peak in described the first channel estimation domain, described the first channel estimation domain and the position of the described target peak in described the first channel estimation domain.
By above summary of the invention as seen, by detection threshold is set, in channel estimation domain, detect the target peak as CIR, therefore when CIR is offset because of time delay, still can get access to CIR to the right.By the position according to target peak the data in the channel estimation domain are sequentially adjusted, near CIR position and this position data are all moved in the position of channel estimation domain of traditional cell transmit power method of adjustment, therefore the desired location of the channel estimation domain after adjustment obtains channel estimation window, can be truncated to exactly CIR, thereby improve the accuracy of channel estimation results.
Description of drawings
Fig. 1 is the Um interface timeslot structural representation of the method for adjustment of traditional cell transmit power;
Fig. 2 is that the training sequence of the method for adjustment of traditional cell transmit power distributes schematic diagram;
Fig. 3 is the Um interface timeslot structural representation of method of adjustment of the cell transmit power of reverse coverage test;
Fig. 4 is the training sequence schematic diagram of method of adjustment of the cell transmit power of reverse coverage test;
Fig. 5 is the flow chart that the channel estimation window of the embodiment of the invention one is determined method;
Fig. 6 is the structural representation that the channel estimation window of the embodiment of the invention two is determined device.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
Basic thought of the present invention is, at first by detection threshold is set, detect target peak in channel estimation domain, then according to the position of target peak the data in the channel estimation domain are sequentially adjusted, the desired location of the channel estimation domain after adjustment obtains channel estimation window.
Fig. 5 is the flow chart that the channel estimation window of the embodiment of the invention one is determined method.The method is used at the definite channel estimation window of the method for adjustment of the cell transmit power of reverse coverage test, and as shown in Figure 1, the method may further comprise the steps.
Step 51: the peak detection threshold is set.
Step 511: detect the first channel estimation domain, obtain the position of peak-peak and the peak-peak of the first channel estimation domain.
Wherein, the first channel estimation domain is rear 128 chips in 144 chips of the first training sequence.Particularly, at first detect the peak-peak of the first channel estimation domain, in 128 chips, select prominent chip, that is: P
Max=max (| R
i|), i=1,2 ..., 128, wherein, P
MaxPeak-peak is R
iBe the power of i chip, i is the chip sequence number.Then, determine the position of peak-peak according to peak-peak, the position of peak-peak represents with the chip sequence number of peak-peak, that is: id
Max=argmax (| R
i|), i=1,2 ..., 128, wherein, id
MaxThe position of expression peak-peak.
Step 512: the peak-to-average force ratio that calculates maximum peak according to peak-peak.
Circular is:
Step 513: the peak-to-average force ratio according to maximum peak calculates the peak detection threshold.
Circular is:
Wherein, PAR
AimBe the peak detection threshold, n is threshold parameter.Threshold parameter n is used for determining the ratio of peak detection threshold and maximum peak, specifically can determine according to the actual conditions of mobile communication system channel estimating.
Step 52: detect the detection territory of the first channel estimation domain according to above-mentioned peak detection threshold, the position that obtains target peak.
Particularly, the appointment in the left side, position of the peak-peak of above-mentioned the first channel estimation domain detects in the length, obtains from left to right first peak-to-average force ratio more than or equal to the position at the peak of above-mentioned peak detection threshold.For example, specify detecting length is 8, then detects the territory and be the 8th chip in left side, position of peak-peak to the 1st chip in left side, position of peak-peak, detects from left to right, one by one peak to average and the above-mentioned peak detection threshold of each chip are compared, namely judge whether to satisfy:
Wherein, be R
jBe the power of j chip, j is for detecting the chip sequence number in territory, j＜id
Max
Step 53: adjust the data order of above-mentioned the first channel estimation domain according to the position of above-mentioned target peak, obtain the second channel estimation domain.
Particularly, the second channel estimation domain comprises successively from starting point: the data before the data after the position of the target peak in the data of the position of the target peak the first channel estimation domain, the first channel estimation domain and the position of the target peak in the first channel estimation domain.That is, the second channel estimation domain is:
Wherein, x is the chip sequence number of second channel estimation domain, id
AimPosition for target peak.
Step 54: the desired location in above-mentioned second channel estimation domain obtains channel estimation window.
Particularly, this desired location can adopt in the method for adjustment of traditional cell transmit power the desired location for channel estimation window.
Abovely determine that by a pair of channel estimation window of the embodiment of the invention method is illustrated, next be that two couples of embodiment adopt the channel estimation window of the method to determine that device describes by the present invention, wherein each component units is when calculating, and specific formula for calculation can be referring to computing formula corresponding in the embodiment of the invention one.
Fig. 6 is the structural representation that the channel estimation window of the embodiment of the invention two is determined device.As shown in Figure 6, this device comprises at least: detection threshold unit, peak 61, target peak unit 62, channel estimation domain unit 63 and channel estimating window unit 64.
Wherein, peak detection threshold unit 61 arranges the peak detection threshold and sends to target peak unit 62.Particularly, detection threshold unit, peak 61 detects the first channel estimation domain, and the position that obtains peak-peak and the peak-peak of the first channel estimation domain is according to the peak-to-average force ratio of peak-peak calculating maximum peak, according to the peak-to-average force ratio calculating peak detection threshold of maximum peak.The circular of peak detection threshold is:
Wherein, PAR
AimBe the peak detection threshold, n is threshold parameter, P
MaxBe peak-peak.
Channel estimation domain unit 63 bases are adjusted the data order of the first channel estimation domain from the position of the target peak of target peak unit 62, obtain the second channel estimation domain and also send to channel estimation window unit 64.Wherein, the second channel estimation domain comprises successively from starting point: the data before the data after the position of the target peak in the data of the position of the target peak the first channel estimation domain, the first channel estimation domain and the position of the target peak in the first channel estimation domain.
Channel estimating window unit 64 obtains channel estimation window at the desired location of second channel estimation domain.This desired location can adopt in the method for adjustment of traditional cell transmit power the desired location for channel estimation window.
By above embodiment as seen, by detection threshold is set, detect target peak in channel estimation domain, according to the position of target peak the data in the channel estimation domain are sequentially adjusted, the desired location of the channel estimation domain after adjustment obtains channel estimation window.Because by detecting the target peak that obtains as CIR, when CIR is offset to the right because of time delay, still can get access to CIR, and, by the data order of adjusting channel estimation domain near the data CIR position and this position are all moved in the position of channel estimation domain of traditional cell transmit power method of adjustment, therefore according to the channel estimation domain after adjusting, obtain channel estimation window at desired location, can guarantee to be truncated to exactly CIR, improve the accuracy of channel estimation results.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (8)
1. a channel estimation window is determined method, it is characterized in that, comprising:
The peak detection threshold is set;
Detect the detection territory of the first channel estimation domain according to described peak detection threshold, the position that obtains target peak;
Adjust the data order of described the first channel estimation domain according to the position of described target peak, obtain the second channel estimation domain, described second channel estimation domain comprises successively from starting point: the data before the data after the position of the described target peak in the data of the position of the described target peak described the first channel estimation domain, described the first channel estimation domain and the position of the described target peak in described the first channel estimation domain;
Desired location in described second channel estimation domain obtains channel estimation window.
2. method according to claim 1 is characterized in that, the described peak detection threshold that arranges comprises:
Detect described the first channel estimation domain, obtain the position of peak-peak and the described peak-peak of described the first channel estimation domain;
Calculate the peak-to-average force ratio of maximum peak according to described peak-peak;
Peak-to-average force ratio according to described maximum peak calculates described peak detection threshold.
3. method according to claim 2 is characterized in that, described peak-to-average force ratio according to described maximum peak calculates described peak detection threshold, comprising:
According to
Calculate described peak detection threshold;
Wherein, PAR
AimBe the peak detection threshold, n is threshold parameter, P
MaxBe peak-peak.
4. according to claim 2 or 3 described methods, it is characterized in that, the described detection territory of detecting the first channel estimation domain according to described peak detection threshold, the position that obtains target peak comprises:
Appointment in the left side, position of the peak-peak of described the first channel estimation domain detects in the length, obtains from left to right first peak-to-average force ratio more than or equal to the position at the peak of described peak detection threshold.
5. a channel estimation window is determined device, it is characterized in that, comprising:
Detection threshold unit, peak is used for arranging the peak detection threshold;
The target peak unit is for the detection territory of detecting the first channel estimation domain according to described peak detection threshold, the position that obtains target peak;
The channel estimation domain unit, be used for adjusting according to the position of described target peak the data order of described the first channel estimation domain, obtain the second channel estimation domain, described second channel estimation domain comprises successively from starting point: the data before the data after the position of the described target peak in the data of the position of the described target peak described the first channel estimation domain, described the first channel estimation domain and the position of the described target peak in described the first channel estimation domain;
The channel estimating window unit is used for obtaining channel estimation window at the desired location of described second channel estimation domain.
6. device according to claim 5 is characterized in that,
Detection threshold unit, described peak obtains the position of peak-peak and the described peak-peak of described the first channel estimation domain specifically for detection of described the first channel estimation domain; Calculate the peak-to-average force ratio of maximum peak according to described peak-peak; Peak-to-average force ratio according to described maximum peak calculates described peak detection threshold.
7. device according to claim 6 is characterized in that,
The concrete basis in detection threshold unit, described peak
Calculate described peak detection threshold, wherein, PAR
AimBe the peak detection threshold, n is threshold parameter, P
MaxBe peak-peak.
8. according to claim 6 or 7 described devices, it is characterized in that,
Described target peak unit specifically is used for detecting in the length in the appointment in the left side, position of the peak-peak of described the first channel estimation domain, obtains from left to right first peak-to-average force ratio more than or equal to the position at the peak of described peak detection threshold.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1825992A (en) * | 2005-02-24 | 2006-08-30 | 大唐移动通信设备有限公司 | Method for measuring adjacent cell |
| CN1893313A (en) * | 2005-07-04 | 2007-01-10 | 上海原动力通信科技有限公司 | Method for defining up-converter channel impact responding and multi-user united detection method |
| CN1953360A (en) * | 2006-10-11 | 2007-04-25 | 凯明信息科技股份有限公司 | Timing follow-up and capture method of timing follow-up system based on serial interference elimination |
| KR20100004690A (en) * | 2008-07-04 | 2010-01-13 | 엘지노텔 주식회사 | Apparatus and method of estimating channel using adaptive channel estimation window in wireless communication based on cazac sequence |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1825992A (en) * | 2005-02-24 | 2006-08-30 | 大唐移动通信设备有限公司 | Method for measuring adjacent cell |
| CN1893313A (en) * | 2005-07-04 | 2007-01-10 | 上海原动力通信科技有限公司 | Method for defining up-converter channel impact responding and multi-user united detection method |
| CN1953360A (en) * | 2006-10-11 | 2007-04-25 | 凯明信息科技股份有限公司 | Timing follow-up and capture method of timing follow-up system based on serial interference elimination |
| KR20100004690A (en) * | 2008-07-04 | 2010-01-13 | 엘지노텔 주식회사 | Apparatus and method of estimating channel using adaptive channel estimation window in wireless communication based on cazac sequence |
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