CN101841410B - 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 efficient wireless resource utility efficiency 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 the high-order modulating such as 16 quadrature amplitude modulation (Quadrature AmplitudeModulation is hereinafter to be referred as QAM), 32QAM, has introduced in addition the high power character rate.
Receiving terminal adopts the random mode of sampling point of selecting to carry out the demodulation of signal usually in the prior art, receiving terminal is in filtered high rate signal, randomly draw single speed sampling point signal, namely select at random sampling point, 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 impact of sampling point, causes the fluctuation of demodulation performance larger, and the overall performance of receiving terminal is unstable and demodulation performance is 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 unstable, 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 reception signal is carried out x speed signal extraction, 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 reception signal;
Sampling point to described extraction is processed synchronously, the sampling point signal after obtaining synchronously;
Described sampling point signal after is synchronously carried out channel estimating, obtain with synchronously after channel factors corresponding to 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 reception signal is carried out x speed signal extraction, 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 reception signal;
Synchronization module is used for the sampling point of described extraction is processed synchronously, 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 synchronously after channel factors corresponding to 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 from a plurality of sampling points, select relatively excellent sampling point according to pre-conditioned, 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 obtain 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 to received signal timing at receiving terminal, from receive 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 the present embodiment adopts utilizes this receiving terminal model shown in Fig. 1 b, the sampling point system of selection that the present embodiment provides comprises:
After signal arrived receiving terminal, receiving terminal carries out first filtering to be processed, and obtains filtered high power symbol rate signals, and receiving terminal carries out x speed signal extraction, the sampling point that obtains extracting to filtered reception signal.Suppose that filtered reception signal is 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.Carry out sampling point quantity that x speed signal extraction obtains and be carrying out the x of the sampling point quantity that single speed signal extraction obtains doubly, can select provide larger selection space for follow-up sampling point thus, be conducive to select the sampling point that can improve the receiving terminal demodulation performance.
Mode and prior art that the sampling point of step 11 extraction is processed synchronously are similar.Optionally, the algorithm of the sampling point that extracts being processed synchronously can be estimated synchronized algorithm for correlated channels.Therefore in step 11, extract x sampling point, after this x sampling point being processed synchronously, obtained x the sampling point signal after synchronous.
Take gsm system as 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 estimation synchronized algorithm that the sampling point that extracts is processed synchronously.
Take single antenna as example, x the sampling point signal after is synchronously carried out respectively channel estimating, can obtain x channel factors corresponding to sampling point signal 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 such 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 training sequence
The matrix that consists of, r represent the vector that consists of with the reception signal of training sequence a after synchronously.
In the present embodiment, according to concrete application scenarios and demand, can consider different pre-conditionedly, from each sampling point that extracts, choose and satisfy this pre-conditioned sampling point.
Herein pre-conditioned according to different demands or scene, can be adopted different conditions, and pre-conditioned can for multiple, for example, including but not limited to: main footpath energy is maximum, signal to noise ratio is maximum, the channel factors energy envelope
Maximum, and the mode of considering weight on above-mentioned several pre-conditioned bases separately.
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, and the energy in main footpath i.e. master footpath energy.
Be example take pre-conditioned to the maximum as leading the footpath energy, further, another embodiment of the present invention provides a kind of sampling point system of selection.Extract sampling point as example take two speeds, the antenna of suppose receiving terminal is single antenna, can extract so to obtain sampling point one and sampling point two, after it is processed synchronously, obtains 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 respectively channel estimating, obtain sampling point one synchronously after channel factors corresponding to sampling point signal
L=0 ..., L, and sampling point two synchronously after channel factors corresponding to signal
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, optional, realize for ease of hardware, this kind situation selects the sampling point of at first sampling to select by default usually, and namely 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 as the sampling point signal behind the footpath energy maximum of obtaining synchronous at least.
More than be antenna take receiving terminal as single antenna describes, under some complicated application scenarioss, under the application scenarios such as many antennas, can carry out in the following way the selection of sampling point signal:
Extract sampling points as example take two antenna two speeds, obtain four sampling points, and calculate four channel factors corresponding to sampling point signal after synchronously:
Antenna one receive signal sampling point one synchronously after channel factors corresponding to sampling point signal:
L=0 ..., L;
Antenna two receive signals sampling point one synchronously after channel factors corresponding to sampling point signal:
L=0 ..., L;
Antenna one receive signal sampling point two synchronously after channel factors corresponding to sampling point signal:
L=0 ..., L;
Antenna two receive signals sampling point two synchronously after channel factors corresponding to sampling point signal:
L=0 ..., L.
Wherein subscript 0 represents 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 default condition, be example take pre-conditioned to the maximum as main footpath energy, 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, this kind situation selects the sampling point of at first sampling to select by default usually, and namely 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
Namely represent antenna two sampling point four synchronously after channel factors corresponding to sampling point signal.
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 of the intersymbol interference that the channel factors that receiving terminal selects different sampling points to obtain shows is different, the main footpath energy of sampling point is larger, and then the intersymbol interference of the sampled signal that obtains according to this sampling point of receiving terminal is just less, and the performance of receiving terminal also can be corresponding higher.Therefore, receiving terminal selects the larger 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 (such as factors such as noise energies), weight can be thought modifying factor.
When receiving terminal is many antennas, if the weight of further considering, 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, this kind situation selects the sampling point of at first sampling to select by default usually, and namely 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 Weight factor in the sampling point signal after each synchronously main footpath energy maximum synchronously after sampling point signal:
Obtain the main footpath energy of the Weight factor 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 the numbering that 1, n is antenna, as
Namely represent antenna two sampling point four synchronously after channel factors corresponding to sampling point signal.K represents the value of weight.
According to the main footpath energy of the Weight factor of each sampling point signal after synchronously of many antennas, obtain the Weight factor main footpath energy maximum synchronously after sampling point signal.
Can find out from said method, after noise energy is considered as weight, when selecting sampling point, can consider the factors such as main footpath energy and noise energy, the main footpath energy of the sampling point of selecting thus is larger, and noise energy is less.Thereby can overcome to a certain extent the deep fade impact in some situation, can improve the robustness of application.Need to prove, weight also can be other, such as 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, according to different application demands, carrying out sampling point signal when selecting, can also be based on other pre-conditioned, as: signal to noise ratio (SNR) is maximum, the channel factors energy envelope
Maximum etc.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 Weight factor 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 Weight factor 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 first the SNR of each sampling point after synchronously, 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 the 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 relatively excellent sampling point, mode with respect to random selection sampling point of the prior art, can overcome the defective of the receiving terminal demodulation performance wide fluctuations that random selection sampling point causes, so that the demodulation performance of receiving terminal tends towards stability on the whole, thereby can improve the performance of receiving terminal.
Need to prove, the above embodiment of the present invention extracts as example take double antenna or double-speed and describes, for other numbers or carry out sampling point and extract and be the situation of other speeds, its processing mode is also substantially similar for the antenna of receiving terminal, and the 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 practical value, referring to following analysis: the method that the sampling point of the present embodiment is selected, when the sampling point that carries out multiple velocity extracted, owing to just signal is carried out the easy choice at sample-based interval, the complexity that therefore 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 the complexity that therefore increases is also few; For the complexity of sampling point selection algorithm, take the main footpath energy maximal criterion of Weight factor as example, its operand only is a small amount of addition, multiplication and comparison operation, and complexity is not high yet.Therefore, the computation complexity that receiving terminal increases in the present embodiment is not high.
The 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 relatively excellent sampling point, so that the demodulation performance of receiving terminal tends 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 carries out first filtering to be processed, and obtains filtered high power symbol rate signals, and receiving terminal carries out x speed signal extraction, the sampling point that obtains extracting to filtered reception 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.Carry out sampling point quantity that x speed signal extraction obtains and be carrying out the x of the sampling point quantity that single speed signal extraction obtains doubly, can select provide larger selection space for follow-up sampling point thus, be conducive to select the sampling point that can improve the receiving terminal demodulation performance.
Mode and prior art that the sampling point that abstraction module 21 extracts is processed synchronously are similar, repeat no more.Optionally, the algorithm of the sampling point that extracts being processed synchronously 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 process synchronously, obtains x sampling point synchronizing signal.
X sampling point synchronizing signal after 23 pairs of synchronization modules of channel estimation module 22 are processed synchronously carried out respectively channel estimating, can obtain the channel factors of x sampling point synchronizing signal.Optionally, can adopt the method such as the LS channel estimating to obtain channel factors.
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, according to concrete application scenarios and demand, can consider different pre-conditionedly, from each sampling point that extracts, choose and satisfy this pre-conditioned sampling point.
Pre-conditioned including but not limited to: main footpath energy is maximum, signal to noise ratio is maximum, the channel factors energy envelope
Maximum, and the mode of considering weight on above-mentioned several pre-conditioned bases separately.
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 for obtaining 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 such as many antennas, can calculate respectively the main footpath energy of the sampling point signal of each antenna, and select the sampling point of each antenna master footpath energy maximum.
At this moment, sampling point is selected module 24, is used for obtaining 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 (such as factors such as noise energies), weight can be thought modifying factor.Namely the pre-conditioned of employing is: the main footpath energy of Weight factor is maximum.
At this moment, sampling point is selected module 24, is used for obtaining the main footpath energy of the Weight factor 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 the numbering that 1, n is antenna, and k represents the value of weight; According to the main footpath energy of the Weight factor of each sampling point signal after synchronously of many antennas, obtain the Weight factor 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 that the signal to noise ratio of the signal to noise ratio maximum of the sampling point signal after synchronously or Weight factor is maximum; Perhaps, the envelope energy of the envelope energy maximum of the sampling point signal after synchronously or Weight factor is maximum.
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 Weight factor 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 Weight factor 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 modules and the processing procedure corresponding description in can reference method embodiment in the present embodiment receiving terminal.
The 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 relatively excellent sampling point, so that the demodulation performance of receiving terminal tends 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 the 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 the present embodiment.The module of above-described embodiment can be merged into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number does not represent 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: the 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 (7)
1. a sampling point signal selection method is characterized in that, described method comprises:
Filtered reception signal is carried out x speed signal extraction, 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 reception signal;
Sampling point to described extraction is processed synchronously, the sampling point signal after obtaining synchronously;
Described sampling point signal after is synchronously carried out channel estimating, obtain with synchronously after channel factors corresponding to sampling point signal;
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.
2. described sampling point signal selection method according to claim 1 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.
3. sampling point signal selection method as claimed in claim 2 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 as the sampling point signal behind the footpath energy maximum of obtaining synchronous at least.
4. 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 Weight factor 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 Weight factor 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.
5. a receiving terminal is characterized in that, comprising:
Abstraction module is used for filtered reception signal is carried out x speed signal extraction, 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 reception signal;
Synchronization module is used for the sampling point of described extraction is processed synchronously, 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 synchronously after channel factors corresponding to sampling point signal;
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.
6. receiving terminal as claimed in claim 5, 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.
7. receiving terminal according to claim 5 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 Weight factor 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 Weight factor 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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| CN102136853B (en) * | 2011-02-11 | 2013-08-28 | 兆讯恒达微电子技术(北京)有限公司 | Receiver, clear channel assessment (CCA) detection device and CCA detection method for power line communication (PLC) system |
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