CN101841410A - Sampling point signal selection method and receiving end - Google Patents
Sampling point signal selection method and receiving end Download PDFInfo
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Abstract
The invention discloses a sampling point signal selection method and a receiving end. The method comprises the following steps: carrying out x-speed signal sampling on filtered received signals to obtain extracted sampling points, wherein x is an integer larger than 1, and x is not larger than the symbol rate multiple of the filtered received signals; carrying out synchronous processing on the extracted sampling points to obtain synchronized sampling point signals; carrying out channel estimation on the synchronized sampling point signals to obtain channel factors which correspond to the synchronized sampling point signals; and taking the synchronized sampling point signals satisfying preset conditions as selected sampling points according to the channel factors. The sampling point signal selection method and the receiving end obtain a plurality of sampling points by multi-speed signal extraction and select relatively better sampling points from the sampling points by the preset conditions so that the demodulation performance of the receiving end tends to be stable on the whole; moreover, the selected sampling points are much closer to the optimal sampling points, and thereby, the receiving performance of the receiving end is improved.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of sampling point signal selection method and receiving terminal.
Background technology
At global system for mobile communications (Global System for Mobile Communications, hereinafter to be referred as GSM) in the process of the continuous evolution of standard, the communication system that occurs comprises: general packet radio service (General Packet Radio Service is hereinafter to be referred as GPRS) system, EGPRS (Enhanced General Packet Radio Service) system and EGPRS2 (second generation Enhanced General Packet Radio Service) system.GPRS is a kind of end-to-end packet switching service that provides on the basis of GSM technology, and wireless resource utility efficiency efficiently is provided.EGPRS has adopted the modulation system of 8 phase-shift keyings (8 Phase Shift Keying are hereinafter to be referred as 8PSK), has greatly improved channel speed.EGPRS2 has introduced high-order modulating such as 16 quadrature amplitude modulation (Quadrature AmplitudeModulation is hereinafter to be referred as QAM), 32QAM, has introduced the high power character rate in addition.
The common employing of receiving terminal selects the mode of sampling point to carry out the demodulation of signal at random in the prior art, receiving terminal is in filtered high rate signal, randomly draw single doubly fast sampling point signal, promptly select sampling point at random, output sample synchronizing signal after synchronously, carry out obtaining channel factors after the channel estimating, utilize synchronizing signal and channel factors to carry out the demodulation process of signal.But this mode can cause the demodulation performance of receiving terminal to be subjected to select at random the influence of sampling point, causes the fluctuation of demodulation performance bigger, and the overall performance instability and the demodulation performance of receiving terminal are not high.
Summary of the invention
The invention provides a kind of sampling point signal selection method and receiving terminal, be used for solving prior art receiving terminal overall performance instability, and the not high problem of demodulation performance.
The embodiment of the invention provides a kind of sampling point signal selection method, and described method comprises:
Filtered received signal is carried out the doubly fast signal extraction of x, the sampling point that obtains extracting, wherein x is the integer greater than 1, and x is less than or equal to the character rate multiple of filtered received signal;
Sampling point to described extraction carries out Synchronous Processing, the sampling point signal after obtaining synchronously;
Described sampling point signal after is synchronously carried out channel estimating, obtain with synchronous after the corresponding channel factors of sampling point signal;
According to described channel factors, will satisfy pre-conditioned sampling point signal after synchronously as the sampling point signal of selecting.
The embodiment of the invention also provides a kind of receiving terminal, comprising:
Abstraction module is used for filtered received signal is carried out the doubly fast signal extraction of x, the sampling point that obtains extracting, and wherein x is the integer greater than 1, and x is less than or equal to the character rate multiple of filtered received signal;
Synchronization module is used for the sampling point of described extraction is carried out Synchronous Processing, the sampling point signal after obtaining synchronously;
Channel estimation module is used for described sampling point signal after is synchronously carried out channel estimating, obtain with synchronous after the corresponding channel factors of sampling point signal;
Sampling point is selected module, is used for according to described channel factors, will satisfy pre-conditioned sampling point signal after synchronously as the sampling point signal of selecting.
The embodiment of the invention obtains a plurality of sampling points by the multiple velocity signal extraction, and according to the pre-conditioned more excellent sampling point relatively of from a plurality of sampling points, selecting, can be so that the demodulation performance of receiving terminal tend towards stability on the whole, and can improve the demodulation performance of receiving terminal.
Description of drawings
The flow chart of the sampling point signal selection method that Fig. 1 a provides for one embodiment of the invention;
The schematic diagram of the receiving terminal model that Fig. 1 b provides for one embodiment of the invention;
The structural representation of the receiving terminal that Fig. 2 provides for one embodiment of the invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making all other embodiment that obtained under the creative work prerequisite.
The flow chart of a kind of sampling point signal selection method that provides for one embodiment of the invention referring to Fig. 1 a, be used for separating timing to received signal at receiving terminal, from received signal, select suitable sampling point, the sampling point of selecting can make the performance of receiving terminal tend towards stability and near the optional sampling point, thereby has improved the performance of receiving terminal.The receiving terminal model that present embodiment adopted utilizes this receiving terminal model shown in Fig. 1 b, the sampling point system of selection that present embodiment provides comprises:
After signal arrived receiving terminal, receiving terminal carried out Filtering Processing earlier, obtains filtered high power symbol rate signals, and receiving terminal carries out the doubly fast signal extraction of x, the sampling point that obtains extracting to filtered received signal.Suppose that filtered received signal is a M times of character rate, then the x span is 1＜x≤M.
For the situation of single antenna, extracting the sampling point number that obtains is x, and for the situation of the individual antenna of N (N＞1), extracting the sampling point number that obtains is N * x.The x that carries out sampling point quantity that the doubly fast signal extraction of x obtains and be carrying out the sampling point quantity that single doubly fast signal extraction obtains doubly can select bigger selection space is provided thus for follow-up sampling point, helps selecting the sampling point that can improve the receiving terminal demodulation performance.
Mode and prior art that the sampling point that step 11 is extracted carries out Synchronous Processing are similar.Optionally, the algorithm that the sampling point that extracts is carried out Synchronous Processing can be estimated synchronized algorithm for correlated channels.In step 11, extracted x sampling point, therefore this x sampling point is carried out Synchronous Processing after, obtain x the sampling point signal after synchronous.
With the gsm system is example, comprise known training sequence in the gsm system, receiving terminal can utilize this training sequence to carry out the Synchronous Processing of sampling point, in gsm system, the length of its training sequence is 26 sign bits, the data of middle 16 bits have good correlation properties, utilize this characteristic of this training sequence, can adopt correlated channels to estimate that synchronized algorithm carries out Synchronous Processing to the sampling point that extracts.
With the single antenna is example, and x the sampling point signal after is synchronously carried out channel estimating respectively, can obtain the channel factors of x the sampling point signal correspondence after synchronously.Such as, to the sampling point signal after synchronous
Carry out channel estimating and obtain channel factors
L=0 ..., L.Wherein,
Subscript 0 expression its corresponding to first sampling point, subscript i=0 ..., L, i element of the corresponding vector of expression sampling point signal;
Subscript 0 expression its corresponding to first sampling point, subscript l=0 ..., L, l element of the corresponding vector of expression channel factors; The value of L is that the length value of the training sequence of system deducts 1, and in gsm system, the length of training sequence is 26, and then the value of L is 25.
Optionally, when carrying out channel estimating, can adopt the mode as LS (least square method) channel estimating to obtain channel factors, the computing formula of LS channel estimating is: h
LS=(A
HA)
-1A
HR, wherein, A is a training sequence
The matrix that constitutes, r are represented the vector that received signal constituted after synchronously with training sequence a.
In the present embodiment,, can consider different pre-conditionedly, from each sampling point that extracts, choose and satisfy this pre-conditioned sampling point according to concrete application scenarios and demand.
Herein pre-conditioned according to different demands or scene, can be adopted different conditions, and pre-conditioned can for example, including but not limited to for multiple: main footpath energy maximum, signal to noise ratio maximum, channel factors energy envelope
Maximum, and the mode of on above-mentioned several pre-conditioned bases separately, considering weight.
Wherein, main footpath energy is: channel estimating obtains the channel factors of certain channel length, is also referred to as the channel factors footpath, and the channel factors in each footpath is calculated its energy (be channel factors mould square), the footpath of energy maximum is referred to as main footpath, the promptly main footpath of the energy in main footpath energy.
With pre-conditioned is that main footpath energy is example to the maximum, and further, another embodiment of the present invention provides a kind of sampling point system of selection.Extracting sampling point with twice speed is example, and the antenna of suppose receiving terminal is a single antenna, can extract so to obtain sampling point one and sampling point two, it is carried out Synchronous Processing after, obtain the sampling point signal behind sampling point one synchronous
And sampling point two synchronously after sampling point signal
Sampling point signal is synchronously carried out channel estimating respectively, obtain sampling point one synchronously after the channel factors of sampling point signal correspondence
L=0 ..., L, and sampling point two synchronously after the channel factors of signal correspondence
L=0 ..., L.And further calculate the main footpath energy of sampling point one
And the main footpath energy of sampling point two
Judge it is to select sampling point one or sampling point two to carry out the equalizing demodulation of receiving terminal according to main footpath energy, with main footpath energy maximum synchronously after the sampling point channel as the sampling point signal of selecting.For example, if satisfy
Then select sampling point one, and utilize sampling point one synchronously after sampling point signal and channel factors do follow-up demodulation process; If satisfy
Then select sampling point two, and utilize sampling point two synchronously after sampling point signal and channel factors do follow-up demodulation process.Need to prove, when
The time, then can from sampling point one and sampling point two, choose one wantonly, optionally, realize that this kind situation selects the sampling point of sampling at first to select as acquiescence usually for ease of hardware, promptly acquiescence is selected sampling point one.When selecting a plurality of sampling point, if the sampling point signal number of the main footpath energy maximum of each sampling point signal after synchronously be at least 2, then select in described 2 sampling point signals after synchronously any one at least as the sampling point signal behind the footpath energy maximum of obtaining synchronous.
More than be that antenna with receiving terminal is that single antenna describes, under some complicated application scenarioss, under the application scenarios as many antennas, can carry out the selection of sampling point signal in the following way:
Extracting sampling points with two antenna twices speed is example, obtains four sampling points, and calculates the channel factors of four sampling point signal correspondences after synchronously:
The sampling point one of antenna one received signal synchronously after the channel factors of sampling point signal correspondence:
L=0 ..., L;
The sampling point one of antenna two received signals synchronously after the channel factors of sampling point signal correspondence:
L=0 ..., L;
The sampling point two of antenna one received signal synchronously after the channel factors of sampling point signal correspondence:
L=0 ..., L;
The sampling point two of antenna two received signals synchronously after the channel factors of sampling point signal correspondence:
L=0 ..., L.
Wherein subscript 0 is represented sampling point one, subscript 1 expression sampling point two, and subscript Ant1 represents antenna one, subscript Ant2 represents antenna two.
When selecting sampling point signal according to preset condition, be that main footpath energy is example to the maximum with pre-conditioned, then the corresponding sampling point method of selecting can be as follows in the present embodiment, and for example whether judgment expression is set up:
IF expression is set up, then export two antennas sampling point one synchronously after sampling point signal and channel factors carry out subsequent operation; Otherwise, IF expression
Set up, then export two antennas sampling point two synchronously after sampling point signal and channel factors carry out subsequent operation.In addition, when
The time, then can from sampling point one and sampling point two, choose one wantonly, export two antennas this sampling point synchronously after sampling point signal and channel factors carry out subsequent operation; Optionally, realize for ease of hardware that this kind situation selects the sampling point of sampling at first to select as acquiescence usually, promptly acquiescence is selected sampling point one.
According to above-mentioned method, can draw, when receiving terminal has a plurality of antennas and has extracted a plurality of sampling point, determine in the following manner main footpath energy maximum in the sampling point signal after each synchronously synchronously after sampling point signal:
Obtain the main footpath energy of each sampling point signal after synchronously of many antennas
P=0 wherein ..., x-1 represents p+1 sampling point signal; h
lThe expression channel factors, l=0 ..., the length that L, L equal the training sequence of system subtracts 1; N represents the number of antenna; As
Promptly represent antenna two sampling point four synchronously after the channel factors of sampling point signal correspondence.
According to the main footpath energy of each sampling point signal after synchronously of many antennas, obtain main footpath energy maximum synchronously after sampling point signal.
Generally, the characteristic difference of the intersymbol interference that the channel factors that receiving terminal selects different sampling points to obtain shows, the main footpath energy of sampling point is big more, and then the intersymbol interference of the sampled signal that obtains according to this sampling point of receiving terminal is just more little, and the performance of receiving terminal also can be corresponding high more.Therefore, receiving terminal selects the bigger sampling point of main footpath energy to carry out equalizing demodulation, can guarantee the stability of receiving terminal performance.
Further, be the scene of many antennas for the antenna of receiving terminal, can also further consider weight (for example factor such as noise energy), weight can be thought modifying factor.
When receiving terminal is many antennas, if further consider weight, such as can be with the noise energy of each sampling point of two antennas as weight, in the noise energy of selecting each each sampling point of antenna
During as weight, Sample=s0 wherein, s1, s0 represent sampling point one, s1 represents sampling point two; Antx=Ant1, Ant2, then the method for sampling point selection can be as follows, for example judges whether following expression formula one is set up:
IF expression one is set up, and then exports the synchronizing signal of the sampling point one of two antennas and carries out subsequent operation; If following expression formula two is set up:
Then export the synchronizing signal of two antenna sampling points two and carry out subsequent operation.
In addition, when
The time, then can from sampling point one and sampling point two, choose one wantonly, export two antennas this sampling point synchronously after sampling point signal and channel factors carry out subsequent operation; Optionally, realize for ease of hardware that this kind situation selects the sampling point of sampling at first to select as acquiescence usually, promptly acquiescence is selected sampling point one.
According to above-mentioned method, can draw, when receiving terminal has a plurality of antennas and has extracted a plurality of sampling point, determine in the following manner the heavy factor of cum rights in the sampling point signal after each synchronously main footpath energy maximum synchronously after sampling point signal:
Obtain the main footpath energy of the heavy factor of cum rights of each sampling point signal after synchronously of many antennas
P=0 wherein ..., x-1 represents p+1 sampling point signal; h
lThe expression channel factors, l=0 ..., the length that L, L equal the training sequence of system subtracts 1, and n is the numbering of antenna, as
Promptly represent antenna two sampling point four synchronously after the channel factors of sampling point signal correspondence.K represents the value of weight.
According to the main footpath energy of the heavy factor of cum rights of each sampling point signal after synchronously of many antennas, obtain the heavy factor of cum rights main footpath energy maximum synchronously after sampling point signal.
From said method as can be seen, after noise energy is considered as weight, when selecting sampling point, can take all factors into consideration factors such as main footpath energy and noise energy, the main footpath energy of the sampling point of selecting thus is bigger, and noise energy is less.Thereby can overcome the deep fade influence under some situation to a certain extent, can improve the robustness of application.Need to prove that weight also can be other, for example receptivity parameter of antenna etc.
Need to prove, when single antenna, also can consider weight, just this moment, the denominator on inequality both sides is identical.
In addition,, carrying out sampling point signal when selecting according to different application demands, can also be based on other pre-conditioned, as signal to noise ratio (snr) maximum, channel factors energy envelope
Maximum or the like.Its processing mode when sampling point signal is selected is similar to the above embodiments, repeats no more herein.Same, when selecting, also can consider to add weight based on above-mentioned two kinds of pre-conditioned sampling point signals that carry out.At this moment, according to channel factors, comprise as the sampling point signal of selecting satisfying pre-conditioned sampling point signal after synchronously: according to channel factors, determine signal to noise ratio maximum in the sampling point signal after each synchronously or the heavy factor of cum rights the signal to noise ratio maximum synchronously after sampling point signal; With the signal to noise ratio maximum determined synchronously after sampling point signal as the sampling point signal of selecting; Perhaps, according to channel factors, determine envelope energy maximum in the sampling point signal after each synchronously or the heavy factor of cum rights the envelope energy maximum synchronously after sampling point signal; With the envelope energy maximum determined synchronously after sampling point signal as the sampling point signal of selecting.
When being to the maximum with signal to noise ratio when pre-conditioned, can obtain the SNR of each sampling point after synchronously earlier, can calculate signal to noise ratio snr by channel factors in the following manner:
r
kBe the sampling point signal after synchronous, σ
2Be the noise energy of obtaining.Utilize channel factors and known training sequence, the sampling point signal training sequence after synchronously is reconstructed obtains
Wherein,
Be the signal of reconstruct, h
lBe channel factors, I
kBe known training sequence.And then can obtain noise energy:
By said method as can be known, the method of present embodiment is by the multiple velocity signal extraction, can access more sampling point, for follow-up sampling point selects to provide the selection space, and by default sampling point selection algorithm, from a plurality of sampling point signals after synchronously, select more excellent sampling point relatively, with respect to the mode of selecting sampling point at random of the prior art, can overcome the defective of selecting the receiving terminal demodulation performance wide fluctuations that sampling point causes at random, make the demodulation performance of receiving terminal tend towards stability on the whole, thereby can improve the performance of receiving terminal.
Need to prove, it is that example describes that the above embodiment of the present invention extracts with double antenna or double-speed, for other numbers or carry out sampling point and extract and be the situation of other times speed, its processing mode is also similar substantially for the antenna of receiving terminal, and present embodiment exemplifies no longer one by one.
Carry out the method that sampling point is selected based on the multiple velocity signal extraction in the present embodiment, can improve the receiving terminal performance, but the computation complexity of receiving terminal can not increase much yet simultaneously, has higher utility, referring to following analysis: the method that the sampling point of present embodiment is selected, when the sampling point that carries out multiple velocity extracted, owing to just signal is carried out easy choice based on the sampling interval, therefore the complexity that increases with respect to prior art was not high; And the complexity of the Synchronous Processing of sampling point and channel estimation method is totally not high, and can reuse, and therefore the complexity that increases is also few; For the complexity of sampling point selection algorithm, the main footpath energy maximal criterion that weighs factor with cum rights is an example, and its operand only is a spot of addition, multiplication and comparison operation, and complexity is not high yet.Therefore, the computation complexity that receiving terminal increased in the present embodiment is not high.
Present embodiment obtains a plurality of sampling points by the multiple velocity signal extraction, and according to the corresponding sampling point selection algorithm of pre-conditioned employing, from a plurality of sampling points, select more excellent sampling point relatively, make the demodulation performance of receiving terminal tend towards stability on the whole, and the sampling point of selecting has improved the receptivity of receiving terminal more near the optional sampling point.
Referring to Fig. 2, the structural representation of the receiving terminal that provides for second embodiment of the invention, this receiving terminal can comprise: abstraction module 21, synchronization module 22, channel estimation module 23 and sampling point are selected module 24.
After signal arrived receiving terminal, receiving terminal carried out Filtering Processing earlier, obtains filtered high power symbol rate signals, and receiving terminal carries out the doubly fast signal extraction of x, the sampling point that obtains extracting to filtered received signal.For the situation of single antenna, extracting the sampling point number that obtains is x, and for the situation of the individual antenna of N (N＞1), extracting the sampling point number that obtains is N * x.The x that carries out sampling point quantity that the doubly fast signal extraction of x obtains and be carrying out the sampling point quantity that single doubly fast signal extraction obtains doubly can select bigger selection space is provided thus for follow-up sampling point, helps selecting the sampling point that can improve the receiving terminal demodulation performance.
Mode and prior art that the sampling point that abstraction module 21 extracts carries out Synchronous Processing are similar, repeat no more.Optionally, the algorithm that the sampling point that extracts is carried out Synchronous Processing can be estimated synchronized algorithm for correlated channels.Abstraction module 21 has extracted x sampling point, so after 22 pairs of this x sampling points of synchronization module carry out Synchronous Processing, obtains x sampling point synchronizing signal.
X sampling point synchronizing signal after 23 pairs of synchronization module 22 Synchronous Processing of channel estimation module carried out channel estimating respectively, can obtain the channel factors of x sampling point synchronizing signal.Optionally, can adopt method to obtain channel factors as the LS channel estimating.
Sampling point is selected module 24, is used for according to this channel factors, will satisfy pre-conditioned sampling point signal after synchronously as the sampling point signal of selecting.
In the present embodiment,, can consider different pre-conditionedly, from each sampling point that extracts, choose and satisfy this pre-conditioned sampling point according to concrete application scenarios and demand.
Pre-conditioned including but not limited to: main footpath energy maximum, signal to noise ratio maximum, channel factors energy envelope
Maximum, and the mode of on above-mentioned several pre-conditioned bases separately, considering weight.
If adopt the pre-conditioned of main footpath energy maximum, then sampling point is selected module 24, is used for according to this channel factors, determine main footpath energy maximum in the sampling point signal after each synchronously synchronously after sampling point signal; With the main footpath energy maximum determined synchronously after sampling point signal as the sampling point signal of selecting.
When the reception antenna of receiving terminal was single antenna, sampling point was selected module 24, was used to obtain the main footpath energy of each sampling point signal after synchronously; According to the main footpath energy of each sampling point signal after synchronously, obtain main footpath energy maximum synchronously after sampling point signal.
Under some complicated application scenarioss, under the application scenarios as many antennas, can calculate the main footpath energy of the sampling point signal of each antenna respectively, and select the sampling point of each antenna master footpath energy maximum.
At this moment, sampling point is selected module 24, is used to obtain the main footpath energy of each sampling point signal after synchronously of many antennas
P=0 wherein ..., x-1 represents p+1 sampling point signal; h
lThe expression channel factors, l=0 ..., the length that L, L equal the training sequence of system subtracts 1; N represents the number of antenna; According to the main footpath energy of each sampling point signal after synchronously of many antennas, obtain main footpath energy maximum synchronously after sampling point signal.
Further, can also further consider weight (for example factor such as noise energy), weight can be thought modifying factor.Promptly the pre-conditioned of employing is: the main footpath energy maximum of the heavy factor of cum rights.
At this moment, sampling point is selected module 24, is used to obtain the main footpath energy of the heavy factor of cum rights of each sampling point signal after synchronously
P=0 wherein ..., x-1 represents p+1 sampling point signal; h
lThe expression channel factors, l=0 ..., the length that L, L equal the training sequence of system subtracts 1, and n is the numbering of antenna, and k represents the value of weight; According to the main footpath energy of the heavy factor of cum rights of each sampling point signal after synchronously of many antennas, obtain the heavy factor of cum rights main footpath energy maximum synchronously after sampling point signal.
Need to prove, sampling point selects module 24 at the sampling point signal number of the main footpath energy maximum of each sampling point signal after synchronously that acquires during at least 2, then selects in described 2 sampling point signals after synchronously any one as the sampling point signal behind the footpath energy maximum of obtaining synchronous at least.
In addition, in the present embodiment, according to different application demands, also can be according to some other pre-conditioned selection sampling point, such as this pre-conditioned can be the signal to noise ratio maximum of the sampling point signal after synchronously or the signal to noise ratio maximum of the heavy factor of cum rights; Perhaps, the envelope energy maximum of the sampling point signal after synchronously or the envelope energy maximum of the heavy factor of cum rights.
At this moment, sampling point is selected module 24, is used for according to channel factors, determine signal to noise ratio maximum in the sampling point signal after each synchronously or the heavy factor of cum rights the signal to noise ratio maximum synchronously after sampling point signal; With the signal to noise ratio maximum determined synchronously after sampling point signal as the sampling point signal of selecting; Perhaps, according to channel factors, determine envelope energy maximum in the sampling point signal after each synchronously or the heavy factor of cum rights the envelope energy maximum synchronously after sampling point signal; With the envelope energy maximum determined synchronously after sampling point signal as the sampling point signal of selecting.
Need to prove the implementation method of each module and the processing procedure corresponding description in can reference method embodiment in the present embodiment receiving terminal.
Present embodiment obtains a plurality of sampling points by the multiple velocity signal extraction, and according to the corresponding sampling point selection algorithm of pre-conditioned employing, from a plurality of sampling points, select more excellent sampling point relatively, make the demodulation performance of receiving terminal tend towards stability on the whole, and the sampling point of selecting has improved the receptivity of receiving terminal more near the optional sampling point.
One of ordinary skill in the art will appreciate that: accompanying drawing is the schematic diagram of an embodiment, and module in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.
One of ordinary skill in the art will appreciate that: the module in the device among the embodiment can be described according to embodiment and be distributed in the device of embodiment, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that previous embodiment is put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of embodiment of the invention technical scheme.
Claims (15)
1. a sampling point signal selection method is characterized in that, described method comprises:
Filtered received signal is carried out the doubly fast signal extraction of x, the sampling point that obtains extracting, wherein x is the integer greater than 1, and x is less than or equal to the character rate multiple of filtered received signal;
Sampling point to described extraction carries out Synchronous Processing, the sampling point signal after obtaining synchronously;
Described sampling point signal after is synchronously carried out channel estimating, obtain with synchronous after the corresponding channel factors of sampling point signal;
According to described channel factors, will satisfy pre-conditioned sampling point signal after synchronously as the sampling point signal of selecting.
2. sampling point signal selection method according to claim 1 is characterized in that, and is described according to described channel factors, comprises as the sampling point signal of selecting satisfying pre-conditioned sampling point signal after synchronously:
According to described channel factors, determine main footpath energy maximum in the sampling point signal after each synchronously synchronously after sampling point signal;
With the main footpath energy maximum determined synchronously after sampling point signal as the sampling point signal of selecting.
3. according to the described sampling point signal selection method of claim 2, it is characterized in that,
When the reception antenna of receiving terminal is single antenna, determine in the following manner main footpath energy maximum in the sampling point signal after each synchronously synchronously after sampling point signal:
Obtain the main footpath energy of each sampling point signal after synchronously;
According to the main footpath energy of each sampling point signal after synchronously, obtain main footpath energy maximum synchronously after sampling point signal.
4. according to the described sampling point signal selection method of claim 2, it is characterized in that,
When the reception antenna of receiving terminal is many antennas, determine in the following manner main footpath energy maximum in the sampling point signal after each synchronously synchronously after sampling point signal:
Obtain the main footpath energy of each sampling point signal after synchronously of many antennas
P=0 wherein ..., x-1 represents p+1 sampling point signal; h
lThe expression channel factors, l=0 ..., the length that L, L equal the training sequence of system subtracts 1, and n represents the number of antenna;
According to the main footpath energy of each sampling point signal after synchronously of many antennas, obtain main footpath energy maximum synchronously after sampling point signal.
5. as claim 3 or 4 described sampling point signal selection methods, it is characterized in that, described obtain main footpath energy maximum synchronously after sampling point signal comprise:
If the sampling point signal number of the main footpath energy maximum of each sampling point signal after synchronously be at least 2, then select in described 2 sampling point signals after synchronously any one at least as the sampling point signal behind the footpath energy maximum of obtaining synchronous.
6. sampling point signal selection method according to claim 1, it is characterized in that, described according to described channel factors, comprise as the sampling point signal of selecting satisfying pre-conditioned sampling point signal after synchronously: the main footpath energy that obtains the heavy factor of cum rights of each sampling point signal after synchronously
P=0 wherein ..., x-1 represents p+1 sampling point signal; h
lThe expression channel factors, l=0 ..., the length that L, L equal the training sequence of system subtracts 1, and n is the number of antenna, and k represents the value of weight;
According to the main footpath energy of the heavy factor of cum rights of each sampling point signal after synchronously, obtain the heavy factor of cum rights main footpath energy maximum synchronously after sampling point signal.
7. sampling point signal selection method according to claim 6 is characterized in that, described weight is the noise energy of each antenna correspondence.
8. sampling point signal selection method according to claim 1 is characterized in that, and is described according to described channel factors, comprises as the sampling point signal of selecting satisfying pre-conditioned sampling point signal after synchronously:
According to described channel factors, determine signal to noise ratio maximum in the sampling point signal after each synchronously or the heavy factor of cum rights the signal to noise ratio maximum synchronously after sampling point signal;
With the signal to noise ratio maximum determined synchronously after sampling point signal as the sampling point signal of selecting; Perhaps,
According to described channel factors, determine envelope energy maximum in the sampling point signal after each synchronously or the heavy factor of cum rights the envelope energy maximum synchronously after sampling point signal;
With the envelope energy maximum determined synchronously after sampling point signal as the sampling point signal of selecting.
9. a receiving terminal is characterized in that, comprising:
Abstraction module is used for filtered received signal is carried out the doubly fast signal extraction of x, the sampling point that obtains extracting, and wherein x is the integer greater than 1, and x is less than or equal to the character rate multiple of filtered received signal;
Synchronization module is used for the sampling point of described extraction is carried out Synchronous Processing, the sampling point signal after obtaining synchronously;
Channel estimation module is used for described sampling point signal after is synchronously carried out channel estimating, obtain with synchronous after the corresponding channel factors of sampling point signal;
Sampling point is selected module, is used for according to described channel factors, will satisfy pre-conditioned sampling point signal after synchronously as the sampling point signal of selecting.
10. receiving terminal according to claim 9 is characterized in that,
Described sampling point is selected module, is used for according to described channel factors, determine main footpath energy maximum in the sampling point signal after each synchronously synchronously after sampling point signal; With the main footpath energy maximum determined synchronously after sampling point signal as the sampling point signal of selecting.
11. receiving terminal according to claim 10 is characterized in that, when the reception antenna of receiving terminal was single antenna, described sampling point was selected module, was used to obtain the main footpath energy of each sampling point signal after synchronously; According to the main footpath energy of each sampling point signal after synchronously, obtain main footpath energy maximum synchronously after sampling point signal; Perhaps,
When the reception antenna of receiving terminal was many antennas, described sampling point was selected module, was used to obtain the main footpath energy of each sampling point signal after synchronously of many antennas
P=0 wherein ..., x-1 represents p+1 sampling point signal; h
lThe expression channel factors, l=0 ..., the length that L, L equal the training sequence of system subtracts 1, and n represents the number of antenna; According to the main footpath energy of each sampling point signal after synchronously of many antennas, obtain main footpath energy maximum synchronously after sampling point signal.
12. receiving terminal as claimed in claim 11, it is characterized in that, described sampling point selects module at the sampling point signal number of the main footpath energy maximum of each sampling point signal after synchronously that acquires during at least 2, selects the sampling point signal behind any one conduct is obtained in described at least 2 sampling point signals after synchronously footpath energy maximum synchronous.
13. receiving terminal according to claim 9 is characterized in that,
Described sampling point is selected module, is used to obtain the main footpath energy of the heavy factor of cum rights of each sampling point signal after synchronously
P=0 wherein ..., x-1 represents p+1 sampling point signal; h
lThe expression channel factors, l=0 ..., the length that L, L equal the training sequence of system subtracts 1, and n is the number of antenna, and k represents the value of weight; According to the main footpath energy of the heavy factor of cum rights of each sampling point signal after synchronously, obtain the heavy factor of cum rights main footpath energy maximum synchronously after sampling point signal.
14. receiving terminal according to claim 13 is characterized in that, described weight is the noise energy of each antenna correspondence.
15. receiving terminal according to claim 9 is characterized in that,
Described sampling point is selected module, is used for according to described channel factors, determine signal to noise ratio maximum in the sampling point signal after each synchronously or the heavy factor of cum rights the signal to noise ratio maximum synchronously after sampling point signal; With the signal to noise ratio maximum determined synchronously after sampling point signal as the sampling point signal of selecting; Perhaps, according to described channel factors, determine envelope energy maximum in the sampling point signal after each synchronously or the heavy factor of cum rights the envelope energy maximum synchronously after sampling point signal; With the envelope energy maximum determined synchronously after sampling point signal as the sampling point signal of selecting.
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