CN101841493B - Obtaining method and receiving terminal for channel estimation window - Google Patents

Abstract

The invention discloses an obtaining method and a receiving terminal for channel estimation windows, belonging to the communication field. In the invention, whether coded composite transport channels (cctrch) in the same time slot experience the same wireless fading is judged, if so, the channel estimation windows of the cctrch can be averaged to obtain high performance, or the channel estimation channel of one cctrch is copied, and the copied channel estimation channels are used as the channel estimation channels of cctrch experiencing the same wireless fading and other cctrch to ensure that cctrch with weak transport power can obtain correct channel estimation windows and are not deleted. Compared with the prior art, the invention has the advantages that the performance is improved, the conclusion whether window averaging or window copying can be conducted can be obtained through judging whether the cctrch experience the same wireless fading, and the realization is simple.

Description

The acquisition methods of channel estimation window and receiving terminal

Technical field

The present invention relates to the communications field, particularly the channel estimation technique in the communications field.

Background technology

TD SDMA (Time Division Synchronous CodeDivision MultipleAccess SCDMA, be called for short " TD-SCDMA ") as the 3-G (Generation Three mobile communication system) standard that is proposed by China, combine a series of new and high technologies such as time division duplex, code division multiple access, joint-detection, smart antenna, baton handover, have availability of frequency spectrum height, development cost low, adapt to characteristics such as asymmetric transmission, have broad application prospects.In the TD-SCDMA system, receiving terminal handling process to received signal as shown in Figure 1.Wherein, in the step of channel estimating, need obtain the channel estimation window of channel, be used for the channel estimating of this channel.Transmission reception technique in the TD-SCDMA system also can be 11061257 United States Patent (USP) referring to the patent No..

At present, in same time slot, may there be a plurality of coded combination transmission channels (CodedComposite Transport Channel is called for short " cctrch ").And between these a plurality of cctrch, may experience identical wireless fading channel (or being called wireless channel), also may experience different wireless fading channels.In present terminal, or different cctrch are adopted oneself channel estimation window separately, or it is average that existing a plurality of cctrch in the same time slot are directly carried out window, the channel estimation window after window is average is as the channel estimation window of each cctrch.

Yet the present inventor finds that there is following problem in present scheme:

1. different cctrch experience same wireless channel, iff separately cctrch is carried out independent processing, namely different cctrch are adopted separately the channel estimation window of oneself, then because the through-put power difference of each cctrch is bigger, weak window may be deleted.Do not take full advantage of the average advantage of window and improve performance.

2. if different cctrch experience different wireless channels.It is average by force each cctrch to be carried out window, and it is average namely existing a plurality of cctrch in the same time slot directly to be carried out window, and then concerning each cctrch, mis-behave is serious.

And, even by direction of arrival (DirectionOfArrival, abbreviation " DOA ") mode of the estimation decision signal angle of arrival, get access to the wave beam forming of each cctrch, it is average further to judge whether to carry out window according to wave beam forming whether identical again, but owing to judge effective ways such as the methods such as MUSIC (Multiple Signal Classification) algorithm and DOA matrix method of DOA, all too complicated in the receiver of TD-SCDMA, and need more sample space, therefore be unfavorable for realizing.

Summary of the invention

The object of the present invention is to provide a kind of acquisition methods and receiving terminal of channel estimation window, improve the receptivity when having a plurality of cctrch in the single time slot.

For solving the problems of the technologies described above, embodiments of the present invention provide a kind of acquisition methods of channel estimation window, comprise following steps:

Whether judgement each coded combination transmission channel cctrch in same time slot has experienced identical wireless fading channel;

To having experienced the cctrch of identical wireless fading channel, it is average that the channel estimation window of each cctrch is carried out window, channel estimation window after window is average is as the channel estimation window of each cctrch, perhaps, to having experienced the cctrch of identical wireless fading channel, the channel estimation window of one of them cctrch is copied, with the channel estimation window of the copy channel estimation window as other cctrch of the identical wireless fading channel of experience;

To having experienced the cctrch of different radio decline, respectively with separately the channel estimation window channel estimation window as this cctrch.

Embodiments of the present invention also provide a kind of receiving terminal, comprise:

Judge module is used for judging whether experienced identical wireless fading channel at each coded combination transmission channel cctrch of same time slot;

The average module of window or window copy module, the average module of window are used for having experienced the cctrch of identical wireless fading channel, and it is average that the channel estimation window of each cctrch is carried out window; Window copy module is used for having experienced the cctrch of identical wireless fading channel, and the channel estimation window of one of them cctrch is copied;

The channel estimation window acquisition module, be used for having experienced the cctrch of identical wireless fading channel, the channel estimation window after window is average as the channel estimation window of each cctrch maybe with the channel estimation window of the copy channel estimation window as other cctrch of the identical wireless fading channel of experience; To having experienced the cctrch of different radio decline, respectively with separately the channel estimation window channel estimation window as this cctrch.

Embodiment of the present invention compared with prior art, the main distinction and effect thereof are:

Judge whether each cctrch in the same time slot has experienced identical wireless fading channel, if experienced identical decline, then its channel estimation window can be averaged with obtained performance and improve, perhaps the channel estimation window with one of them cctrch copies, with the channel estimation window of the copy channel estimation window as other cctrch of the identical wireless fading channel of experience, guaranteed that the more weak cctrch of through-put power also may access correct channel estimation window, and can be not deleted.If experienced different wireless channels, then independently use the channel estimation window of oneself separately.With respect to of the prior art or different cctrch are adopted separately oneself channel window, a plurality of cctrch are directly carried out the average technical scheme of window, be conducive to the raising on the performance, and, because by whether each cctrch having been experienced the judgement of identical wireless fading channel, can draw and can carry out the conclusion that window is average or window copies, simple, be beneficial to realization.

Further, if two cctrch satisfy the maximum diameter aligned in position of channel in continuous N frame, and the phase difference of maximum diameter position judges then that less than default thresholding these two cctrch have experienced identical wireless fading channel.Owing to only need add up maximum diameter and the phase place of cctrch, can whether have been experienced the result of determination of same wireless decline, guaranteed that further the present invention program's is simple.Be beneficial to very much terminal and realize, and the sample that needs is also fewer.

Further, the time slot of judgement can be 0 time slot in the TD-SCDMA system.Owing in 0 time slot, exist the concurrent problem of a plurality of cctrch particularly outstanding, therefore judge whether each cctrch in 0 time slot has experienced identical wireless fading channel, the further raising on the guaranteed performance.Certainly, this method also can be generalized to other descending time slots.

Description of drawings

Fig. 1 is the receiving terminal handling process schematic diagram to received signal according to TD-SCDMA of the prior art system;

Fig. 2 is the acquisition methods flow chart according to the channel estimation window of first embodiment of the invention;

Fig. 3 is the receiving terminal structural representation according to third embodiment of the invention.

Embodiment

In the following description, in order to make the reader understand the application better many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on many variations and the modification of following each execution mode, also can realize each claim of the application technical scheme required for protection.

For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing embodiments of the present invention are described in further detail.

First embodiment of the invention relates to a kind of acquisition methods of channel estimation window, and idiographic flow as shown in Figure 2.

In step 210, the single time slot for the treatment of judgement carries out noise reduction process, obtains the CHE (result behind the noise reduction) of this time slot.In the present embodiment, the time slot that has judged whether to experience each cctrch place of identical wireless fading channel is 0 time slot in the TD-SCDMA system.

Then, in step 220, judge that whether this residential quarter window power be zero, if be zero, process ends then; If non-vanishing, then enter step 230.

In step 230, each cctrch in 0 time slot carried out window activate to detect and window is average, obtain the channel estimation window of each cctrch.

Then, in step 240, judge whether each cctrch in this time slot has experienced identical wireless fading channel.In the present embodiment, add up by maximum diameter and phase place to cctrch, judge whether to have experienced the same wireless decline.If two cctrch satisfy the maximum diameter aligned in position of channel in continuous N frame, and the phase difference of maximum diameter position judges then that less than default thresholding these two cctrch have experienced identical decline, and wherein, N is natural number.

Specifically, the position that makes the maximum diameter of cctrch_i is M, such as the maximum diameter of cctrch_i is the 6th footpath, M=6 then, and the channel value in this footpath is:

h _M＝a+bj

The position that makes the maximum diameter of cctrch_n is N, and the channel value in this footpath is:

h _N＝c+dj

The phase difference of the maximum diameter position of these two cctrch is:

$\mathrm{\Δ\θ}=\mathrm{arctg}\frac{b}{a}-\mathrm{arctg}\frac{d}{c}$

Judge whether that the N continuous frame satisfies condition:

$\left\{\begin{array}{c}M=N\\ \left|\mathrm{\Δ\θ}\right|\≤\mathrm{\Δ}{\mathrm{\θ}}_{\mathrm{th}}\end{array}\right.$

If the N continuous frame satisfies above condition, think that cctrch_i and cctrch_n have experienced identical wireless fading channel; Otherwise, judge that cctrch_i does not experience identical wireless fading channel with cctrch_n.

Owing to only need add up maximum diameter and the phase place of cctrch, can whether have been experienced the result of determination of same wireless decline, guaranteed that further the present invention program's is simple.Be beneficial to very much terminal and realize, and the sample that needs is also fewer.

In step 250, to having experienced the cctrch of identical wireless fading channel, it is average that the channel estimation window of each cctrch is carried out window, and the channel estimation window after window is average is as the channel estimation window of each cctrch.Perhaps, to having experienced the cctrch of identical wireless fading channel, the channel estimation window of one of them cctrch is copied, with the channel estimation window of the copy channel estimation window as other cctrch of the identical wireless fading channel of experience, such as, cctrch_1 has experienced identical wireless fading channel with cctrch_2, if the window of cctrch_2 is weak (validity of cctrch_2 derives from top signaling), then can the channel estimation window of cctrch_1 be copied, with the channel estimation window of the channel estimation window behind the copy as cctrch_2.

In step 260, to having experienced the cctrch of different radio decline, respectively with separately the channel estimation window channel estimation window as this cctrch.

Be not difficult to find, in the present embodiment, by judging whether each cctrch in the same time slot has experienced identical wireless fading channel, if experienced identical decline, then its channel estimation window can be averaged with obtained performance and improve, perhaps the channel estimation window with one of them cctrch copies, with the channel estimation window of the copy channel estimation window as other cctrch of the identical wireless fading channel of experience, guaranteed that the more weak cctrch of through-put power also may access correct channel estimation window, and can be not deleted.If experienced different wireless channels, then independently use the channel estimation window of oneself separately.With respect to of the prior art or different cctrch are adopted separately oneself channel window, a plurality of cctrch are directly carried out the average technical scheme of window, be conducive to the raising on the performance, and, since can carry out the conclusion that window is average or window copies by whether each cctrch having been experienced the judgement of identical wireless fading channel, can having drawn, simple, the sample that needs is also less, is beneficial to realization.

In addition, what deserves to be mentioned is, because in 0 (not limiting to 0 time slot) of TD-SCDMA system time slot, exist the concurrent problem of a plurality of cctrch particularly outstanding, judge whether each cctrch in 0 time slot has experienced identical wireless fading channel, the further raising on the guaranteed performance, so 0 time slot with the TD-SCDMA system is that example describes in the present embodiment.Yet, it will be understood by those skilled in the art that the type of present embodiment and system, time slot there is no the relation of essence, therefore, in actual applications, in any time slot of present embodiment applicable to any system.

Second embodiment of the invention relates to a kind of acquisition methods of channel estimation window.Second execution mode and first execution mode are basic identical, and difference mainly is:

In the first embodiment, add up by maximum diameter and phase place to cctrch, judge whether to have experienced the same wireless decline.If two cctrch satisfy the maximum diameter aligned in position of channel in continuous N frame, and the phase difference of maximum diameter position judges then that less than default phase difference thresholding these two cctrch have experienced identical decline, and wherein, N is natural number.

Yet in the present embodiment, judge according to the similarity of the channel envelope of two cctrch whether these two cctrch have experienced identical wireless fading channel, if similarity greater than the similarity thresholding that presets, is judged and experienced identical wireless fading channel.Certainly, similarity thresholding herein and phase difference thresholding in first execution mode are two different thresholdings.

Each method execution mode of the present invention all can be realized in modes such as software, hardware, firmwares.No matter the present invention be with software, hardware, or the firmware mode realize, instruction code can be stored in the memory of computer-accessible of any kind (for example permanent or revisable, volatibility or non-volatile, solid-state or non-solid-state, fixing or removable medium etc.).Equally, memory can for example be programmable logic array (Programmable Array Logic, be called for short " PAL "), random access memory (Random Access Memory, be called for short " RAM "), programmable read only memory (Programmable Read Only Memory, be called for short " PROM "), read-only memory (Read-Only Memory, be called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM, be called for short " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc is called for short " DVD ") etc.

Third embodiment of the invention relates to a kind of receiving terminal.Specifically as shown in Figure 3, this receiving terminal comprises:

Judge module is used for judging whether experienced identical wireless fading channel at each coded combination transmission channel cctrch of same time slot.

The average module of window or window copy module, the average module of window are used for having experienced the cctrch of identical wireless fading channel, and it is average that the channel estimation window of each cctrch is carried out window.Window copy module is used for having experienced the cctrch of identical wireless fading channel, and the channel estimation window of one of them cctrch is copied.

The channel estimation window acquisition module, be used for having experienced the cctrch of identical wireless fading channel, the channel estimation window after window is average as the channel estimation window of each cctrch maybe with the channel estimation window of the copy channel estimation window as other cctrch of the identical wireless fading channel of experience.To having experienced the cctrch of different radio decline, respectively with separately the channel estimation window channel estimation window as this cctrch.

Wherein, judge module judges in the following manner whether each the coded combination transmission channel cctrch in same time slot has experienced identical wireless fading channel:

If two cctrch satisfy the maximum diameter aligned in position of channel in continuous N frame, and the phase difference of maximum diameter position judges then that less than default thresholding these two cctrch have experienced identical decline, and wherein, N is natural number.

The receiving terminal that present embodiment finds is the receiving terminal in the TD SDMA TD-SCDMA system, and the time slot that has judged whether to experience each cctrch place of identical wireless fading channel is 0 time slot in the TD-SCDMA system.

Be not difficult to find that first execution mode is the method execution mode corresponding with present embodiment, present embodiment can with the enforcement of working in coordination of first execution mode.The correlation technique details of mentioning in first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in the present embodiment also can be applicable in first execution mode.

Four embodiment of the invention relates to a kind of receiving terminal.The 4th execution mode and the 3rd execution mode are basic identical, and difference mainly is:

In the 3rd execution mode, judge module judges in the following manner whether each the coded combination transmission channel cctrch in same time slot has experienced identical wireless fading channel:

If two cctrch satisfy the maximum diameter aligned in position of channel in continuous N frame, and the phase difference of maximum diameter position judges then that less than default thresholding these two cctrch have experienced identical decline, and wherein, N is natural number.

Yet in the 4th execution mode, judge module judges in the following manner whether each the coded combination transmission channel cctrch in same time slot has experienced identical wireless fading channel:

If the similarity of the channel envelope of two cctrch, is then judged these two cctrch greater than presetting thresholding and has been experienced identical wireless fading channel.

Be not difficult to find that second execution mode is the method execution mode corresponding with present embodiment, present embodiment can with the enforcement of working in coordination of second execution mode.The correlation technique details of mentioning in second execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in the present embodiment also can be applicable in second execution mode.

Need to prove, each unit of mentioning in each equipment execution mode of the present invention all is logical block, physically, a logical block can be a physical location, it also can be the part of a physical location, can also realize that the physics realization mode of these logical blocks itself is not most important with the combination of a plurality of physical locations, the combination of the function that these logical blocks realize is the key that just solves technical problem proposed by the invention.In addition, for outstanding innovation part of the present invention, above-mentioned each the equipment execution mode of the present invention will not introduced not too close unit with solving technical problem relation proposed by the invention, and this does not show that there is not other unit in the said equipment execution mode.

Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.

Claims (12)

1. the acquisition methods of a channel estimation window is characterized in that, comprises following steps:

Whether judgement each coded combination transmission channel cctrch in same time slot has experienced identical wireless fading channel; Wherein, if two cctrch satisfy the maximum diameter aligned in position of channel in continuous N frame, and the phase difference of maximum diameter position judges then that less than default thresholding these two cctrch have experienced identical decline, and wherein, described N is natural number;

To having experienced the cctrch of identical wireless fading channel, it is average that the channel estimation window of each cctrch is carried out window, channel estimation window after window is average is as the channel estimation window of each cctrch, perhaps, to having experienced the cctrch of identical wireless fading channel, the channel estimation window of one of them cctrch is copied, with the channel estimation window of the copy channel estimation window as other cctrch of the identical wireless fading channel of experience;

To having experienced the cctrch of different radio decline, respectively with separately the channel estimation window channel estimation window as this cctrch.

2. the acquisition methods of channel estimation window according to claim 1 is characterized in that, the acquisition methods of described channel estimation window is applied in the TD SDMA TD-SCDMA system.

3. the acquisition methods of channel estimation window according to claim 2 is characterized in that, described time slot is 0 time slot.

4. the acquisition methods of a channel estimation window is characterized in that, comprises following steps:

Whether judgement each coded combination transmission channel cctrch in same time slot has experienced identical wireless fading channel; Wherein, judge according to the similarity of the channel envelope of two cctrch whether these two cctrch have experienced identical wireless fading channel, if similarity is greater than presetting thresholding, then judges and experienced identical wireless fading channel;

To having experienced the cctrch of identical wireless fading channel, it is average that the channel estimation window of each cctrch is carried out window, channel estimation window after window is average is as the channel estimation window of each cctrch, perhaps, to having experienced the cctrch of identical wireless fading channel, the channel estimation window of one of them cctrch is copied, with the channel estimation window of the copy channel estimation window as other cctrch of the identical wireless fading channel of experience;

To having experienced the cctrch of different radio decline, respectively with separately the channel estimation window channel estimation window as this cctrch.

5. the acquisition methods of channel estimation window according to claim 4 is characterized in that, the acquisition methods of described channel estimation window is applied in the TD SDMA TD-SCDMA system.

6. the acquisition methods of channel estimation window according to claim 5 is characterized in that, described time slot is 0 time slot.

7. a receiving terminal is characterized in that, comprises:

Judge module is used for judging whether experienced identical wireless fading channel at each coded combination transmission channel cctrch of same time slot; Wherein, if two cctrch satisfy the maximum diameter aligned in position of channel in continuous N frame, and the phase difference of maximum diameter position judges then that less than default thresholding these two cctrch have experienced identical decline, and wherein, described N is natural number,

The average module of window or window copy module, the average module of described window are used for having experienced the cctrch of identical wireless fading channel, and it is average that the channel estimation window of each cctrch is carried out window; Described window copy module is used for having experienced the cctrch of identical wireless fading channel, and the channel estimation window of one of them cctrch is copied;

The channel estimation window acquisition module, be used for having experienced the cctrch of identical wireless fading channel, the channel estimation window after window is average as the channel estimation window of each cctrch maybe with the channel estimation window of the copy channel estimation window as other cctrch of the identical wireless fading channel of experience; To having experienced the cctrch of different radio decline, respectively with separately the channel estimation window channel estimation window as this cctrch.

8. receiving terminal according to claim 7 is characterized in that, described receiving terminal is the receiving terminal in the TD SDMA TD-SCDMA system.

9. receiving terminal according to claim 8 is characterized in that, described time slot is 0 time slot.

10. a receiving terminal is characterized in that, comprises:

Judge module is used for judging whether experienced identical wireless fading channel at each coded combination transmission channel cctrch of same time slot; Wherein, if two cctrch satisfy the maximum diameter aligned in position of channel in continuous N frame, and the phase difference of maximum diameter position judges then that less than default thresholding these two cctrch have experienced identical decline, and wherein, described N is natural number,

The average module of window or window copy module, the average module of described window are used for having experienced the cctrch of identical wireless fading channel, and it is average that the channel estimation window of each cctrch is carried out window; Described window copy module is used for having experienced the cctrch of identical wireless fading channel, and the channel estimation window of one of them cctrch is copied;

The channel estimation window acquisition module, be used for having experienced the cctrch of identical wireless fading channel, the channel estimation window after window is average as the channel estimation window of each cctrch maybe with the channel estimation window of the copy channel estimation window as other cctrch of the identical wireless fading channel of experience; To having experienced the cctrch of different radio decline, respectively with separately the channel estimation window channel estimation window as this cctrch.

11. receiving terminal according to claim 10 is characterized in that, described receiving terminal is the receiving terminal in the TD SDMA TD-SCDMA system.

12. receiving terminal according to claim 11 is characterized in that, described time slot is 0 time slot.

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