CN1852046B - Method for detecting physical channel energy - Google Patents
Method for detecting physical channel energy Download PDFInfo
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- CN1852046B CN1852046B CN2005100772794A CN200510077279A CN1852046B CN 1852046 B CN1852046 B CN 1852046B CN 2005100772794 A CN2005100772794 A CN 2005100772794A CN 200510077279 A CN200510077279 A CN 200510077279A CN 1852046 B CN1852046 B CN 1852046B
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- information bit
- physical channel
- marking value
- maximum decoding
- decoding marking
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Abstract
This invention relates to a test method for the energy of a physical channel including: obtaining the maximum score of decoding based on the received information bits, then testing if there are information bits on the physical channel based on the score.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of detection method of physical channel energy.
Background technology
In wireless communication system, WCDMA (Wideband Code Division MultipleAccess particularly; The Wideband Code Division Multiple Access (WCDMA) access) in the system, physical channel is the carrier that information bit sends.In the physical channel process of transmitting, in the information bit that physical channel transmits, do not conform to CRC is arranged (CyclicRedundancy Check; Cyclic redundancy check (CRC)) when bit and special pilot bits, it is unknown signal under certain conditions that receiver must be able to receive its form, so receiving terminal need carry out the blind Detecting of signal, and whether promptly detect has information bit to send on this physical channel.
The technical scheme of the described blind Detecting technology of the prior art one relevant with the present invention, as shown in Figure 1, the information bit that transmitting terminal sends sends to receiving terminal by the wireless physical channel carrying after block encoding, spread spectrum, scrambling; In the base station side of receiving terminal, at first the signal that receives is carried out descrambling and de-spreading, obtain M information bit value, the Mbit before the corresponding transmitting terminal spread spectrum; Then, each bit (information bit) is asked energy, M energy accumulation got up, then this is added up and (T can determine by certain false alarm probability indicator with a default thresholding T, to satisfy 1% false alarm probability such as T) compare, then think greater than this thresholding to exist on this physical channel information bit to send, otherwise then thinking does not have information bit to send on this physical channel.
By the technical scheme of prior art as can be seen, it is by asking energy to each bit (information bit), the thresholding that then M energy accumulation is got up and preset compares, and does not utilize M the correlation between the bit, therefore can not make system obtain more excellent performance.
The technical scheme of the described blind Detecting technology of the prior art two relevant with the present invention, as shown in Figure 2, the information bit that transmitting terminal sends sends to receiving terminal by the wireless physical channel carrying after block encoding, spread spectrum, scrambling; In the base station side of receiving terminal, at first the signal that receives is carried out descrambling and de-spreading, obtain M value, the Mbit before the corresponding transmitting terminal spread spectrum; Simultaneously, another demodulation branch road carries out descrambling, despreading, correction, decoding, obtains initial N information source bit; Carry out then and transmitting terminal identical (M, N) block encoding, the Mbit after obtaining encoding; Subsequently the value of the M after this Mbit and the despreading is carried out dot product, carry out relevant adding up after the dot product M/3 time, obtain relevant accumulation result M/3 time; Then M/3 relevant accumulation result asked energy, then remake noncoherent accumulation 3 times; To add up at last and (T can determine by certain false alarm probability indicator, will satisfy 1% false alarm probability such as T with a default thresholding T.) relatively, think greater than this thresholding to exist information bit to send on this physical channel, otherwise then thinking does not have information bit to send on this physical channel.
Because wireless channel is a fading channel, it carries out phase overturn according to certain cycle decline, and for M bit, its phase place may be antipodal, and be concerned with and add this moment, and its effect is born; And corresponding bit phase generally is a homophase in M/3 relevant cycle, so prior art two adopts M/3 noncoherent accumulations but not carry out being concerned with for M time and add up after the technical scheme, and the performance of system is far superior to prior art one.But, the technical scheme structure more complicated of prior art two, and this method is just by asking energy to M/3 relevant accumulation result, then remake noncoherent accumulation 3 times, to add up at last and make comparisons and detect energy on the physical channel with a default thresholding T, and it does not still make full use of the correlation between the Mbit, therefore can not obtain more excellent communication system performance effect.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the purpose of this invention is to provide a kind of detection method of physical channel energy, by this method, M the correlation between information bit can be made full use of, thereby the systematic function more excellent can be obtained than prior art; And technical pattern of the present invention is fairly simple, thereby has good realizability.
The objective of the invention is to be achieved through the following technical solutions:
The detection method of a kind of physical channel energy provided by the invention comprises:
A, in base station side, obtain maximum decoding marking value according to the information bit that receives;
B, detect on the physical channel whether have information bit based on described maximum decoding marking value.
Wherein, described steps A specifically comprises:
A1, in base station side, the information bit that receives is successively carried out descrambling and despreading handles;
The processing of rectifying a deviation of A2, the information bit after will handling, the some despread values when obtaining the corresponding blocks coding in the same code word matrix;
Some despread values that A3, the back of will rectifying a deviation obtain and each the some dimensional vector in the described code word matrix are made dot product, and described dot product result is added up, and obtain the decoding marking value of each the row vector correspondence in the corresponding code word matrix;
A4, more described decoding marking value are chosen maximum decoding marking value.
Wherein, described step B specifically comprises:
B1, described maximum decoding marking value is compared with setting thresholding,, then confirm to exist on this physical channel information bit to send when described maximum decoding marking value during greater than described thresholding; Otherwise, confirm not have on this physical channel information bit to send.
Wherein, described step B specifically comprises:
B2, described maximum decoding marking value is carried out square, obtain the square value of described maximum decoding marking value;
B3, described square value is compared with setting thresholding,, then confirm to exist on this physical channel information bit to send when described square value during greater than described thresholding; Otherwise thinking does not have the information bit transmission on this physical channel.
Wherein, described setting thresholding is determined by false alarm probability indicator.
Wherein, before execution in step A, also comprise:
C1, at transmitting terminal, the information bit that will transmit on physical channel carries out block encoding;
C2, the information bit behind the described block encoding is successively carried out spread spectrum and scrambling handle, and the information bit after will handling sends the base station of receiving terminal to through wireless channel.
Wherein, the code word of described maximum decoding marking value correspondence is the information bit that obtains after the source information bits of encoded of transmitting terminal transmission; The source information bit that the corresponding transmitting terminal of the index of described code word sends.
As seen from the above technical solution provided by the invention, the present invention is at first in base station side, received signal is carried out descrambling, despreading, correction and decoding after, obtain maximum decoding marking value; Based on the information bit on the described maximum decoding marking value detection physical channel, this technical scheme based on maximum marking value of the present invention can make full use of M the correlation between information bit, thereby can obtain the systematic function more excellent than prior art then; And technical pattern of the present invention is fairly simple, thereby has good realizability.
Description of drawings
Fig. 1 is the flow chart of prior art one;
Fig. 2 is the flow chart of prior art two;
Fig. 3 is a flow chart of the present invention;
The systematic function curve that Fig. 4 obtains when using prior art for the systematic function curve using the present invention and obtain.
Embodiment
The invention provides a kind of detection method of physical channel energy, its core is: at first in base station side, received signal carried out descrambling, despreading, correction and decoding after, obtain maximum decoding marking value; Then based on the information bit on the described maximum decoding marking value detection physical channel.
Embodiment provided by the invention, as shown in Figure 3:
At transmitting terminal, implementation step and prior art are identical, mainly comprise:
At first physical channel information transmitted bit is handled through the code word matrix block encoding, obtained the information bit behind the block encoding; Then the information bit behind the described coding being carried out spread spectrum and scrambling handles; With after wireless physical channel sends the base station side of receiving terminal to.
In the base station side of described receiving terminal, the processing procedure of the information bit that receives is comprised:
The processing of rectifying a deviation of step 2, the information bit after will handling, the some despread values when obtaining the corresponding blocks coding in the same code word matrix;
Some despread values that step 3, the back of will rectifying a deviation obtain successively with described code word matrix in each some dimensional vector make dot product, and described dot product result is added up, obtain the decoding marking value of each the vector correspondence in the corresponding code word matrix;
Step 4, more described decoding marking value are chosen maximum decoding marking value.
Step 5, described physical channel is detected based on described maximum decoding marking value.
Wherein, the described process that described physical channel is detected based on described maximum decoding marking value comprises two kinds of situations, and second kind of situation wherein only is shown among Fig. 3.
First kind of situation directly comparing described maximum decoding marking value with setting thresholding, when this marking value during greater than described thresholding, then confirm to exist on this physical channel information bit to send; Otherwise, confirm not have on this physical channel information bit to send.
Second kind of situation comprises:
Step 2, described square value is compared with setting thresholding,, then confirm to exist on this physical channel information bit to send when described square value during greater than described thresholding; Otherwise thinking does not have the information bit transmission on this physical channel.
Wherein, described setting thresholding is determined by certain false alarm probability indicator.To satisfy 1% false alarm probability such as T.
Information bit with transmission Nbit on the physical channel is the specific implementation process that in base station side physical channel is detected in example explanation the foregoing description below:
At transmitting terminal, on physical channel, send the information bit of Nbit, at first with the information bit of described Nbit, with M=30, (M is listed as the code word matrix of N=10 altogether; 2
NOK) carry out block encoding, because in code word matrix, so the corresponding vector of each row is through obtaining the information bit of 30bit after the block encoding processing; Information bit after will encoding then carries out spread spectrum and scrambling is handled, and the information bit after will handling sends the base station side of receiving terminal to.
In base station side, at first the information bit that receives to be carried out descrambling and despreading and handle, processings of rectifying a deviation of the information bit after will handling then obtains M=30 despread values, the 30bit after the difference corresponding blocks is encoded; Information bit after then correction being handled is deciphered, and the despreading results that are about to 30 dimensions make dot product with each 30 dimensional vector in 1024 * 30 the code word matrix, add up again, obtain 1024 add up and, each accumulation result is one and deciphers the marking value.Compare these decoding marking values then, obtain maximum decoding marking value, the code word of described maximum decoding marking value correspondence is the information bit that obtains after the source information bits of encoded of transmitting terminal transmission; The source information bit that the corresponding transmitting terminal of the index of described code word sends.As the code word of correspondence is the 30bit that obtains behind the block encoding, and codewords indexes is as block encoding 2
NAny delegation in the row, 10 bits of row correspondence are the information source bit of transmission, the information bit after also the decoding of corresponding diagram 3 is exported simultaneously.
By the technical scheme of the invention described above as can be seen, the present invention can make full use of the correlation between information bit behind the coding, thereby can obtain optimum systematic function.As shown in Figure 4, according to same setting thresholding, with N=10, M=30, spreading factor SF=256 is an example, and the systematic function that the technical scheme of employing prior art one obtains is shown in curve 1, and the systematic function that the technical scheme of employing prior art two obtains is shown in curve 2, adopt systematic function that technical scheme of the present invention obtains shown in curve 3, so the present invention can obtain the systematic function more excellent than prior art.
In addition, technical pattern of the present invention is fairly simple, thereby has good realizability.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (6)
1. the detection method of a physical channel energy is characterized in that, comprising:
A, in base station side, obtain maximum decoding marking value according to the information bit that receives, described steps A specifically comprises:
A1, in base station side, the information bit that receives is successively carried out descrambling and despreading handles;
The processing of rectifying a deviation of A2, the information bit after will handling, the some despread values when obtaining the corresponding blocks coding in the same code word matrix;
Some despread values that A3, the back of will rectifying a deviation obtain and each the some dimensional vector in the described code word matrix are made dot product, and described dot product result is added up, and obtain the decoding marking value of each the row vector correspondence in the corresponding code word matrix;
A4, more described decoding marking value are chosen maximum decoding marking value;
B, detect on the physical channel whether have information bit based on described maximum decoding marking value.
2. method according to claim 1 is characterized in that, described step B specifically comprises:
B1, described maximum decoding marking value is compared with setting thresholding,, then confirm to exist on this physical channel information bit to send when described maximum decoding marking value during greater than described thresholding; Otherwise, confirm not have on this physical channel information bit to send.
3. method according to claim 1 is characterized in that, described step B specifically comprises:
B2, described maximum decoding marking value is carried out square, obtain the square value of described maximum decoding marking value;
B3, described square value is compared with setting thresholding,, then confirm to exist on this physical channel information bit to send when described square value during greater than described thresholding; Otherwise thinking does not have the information bit transmission on this physical channel.
4. according to claim 2 or 3 described methods, it is characterized in that described setting thresholding is determined by false alarm probability indicator.
5. method according to claim 4 is characterized in that, before execution in step A, also comprises:
C1, at transmitting terminal, the information bit that will transmit on physical channel carries out block encoding;
C2, the information bit behind the described block encoding is successively carried out spread spectrum and scrambling handle, and the information bit after will handling sends the base station of receiving terminal to through wireless channel.
6. method according to claim 1 is characterized in that, the code word of described maximum decoding marking value correspondence is the information bit that obtains after the source information bits of encoded of transmitting terminal transmission; The source information bit that the corresponding transmitting terminal of the index of described code word sends.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2005100772794A CN1852046B (en) | 2005-06-21 | 2005-06-21 | Method for detecting physical channel energy |
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| CN2005100772794A CN1852046B (en) | 2005-06-21 | 2005-06-21 | Method for detecting physical channel energy |
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| CN1852046B true CN1852046B (en) | 2010-08-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101500300B (en) * | 2009-03-24 | 2011-02-16 | 清华大学 | Method and apparatus for energy allocation |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1167416A (en) * | 1997-03-28 | 1997-12-10 | 北京信威通信技术有限公司 | Method for testing spectrum spreading signal in code division multi-address radio communication system |
| CN1389995A (en) * | 2001-06-01 | 2003-01-08 | 上海大唐移动通信设备有限公司 | Method and device for capturing synchronizing-code before random access of channel in WCDMA system |
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- 2005-06-21 CN CN2005100772794A patent/CN1852046B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1167416A (en) * | 1997-03-28 | 1997-12-10 | 北京信威通信技术有限公司 | Method for testing spectrum spreading signal in code division multi-address radio communication system |
| CN1389995A (en) * | 2001-06-01 | 2003-01-08 | 上海大唐移动通信设备有限公司 | Method and device for capturing synchronizing-code before random access of channel in WCDMA system |
Non-Patent Citations (3)
| Title |
|---|
| CN 1389995 A,全文. |
| 陈谦让,司亮.CDMA系统中的快速捕获技术.现代电子技术 13.2003,(13),58-59. |
| 陈谦让,司亮.CDMA系统中的快速捕获技术.现代电子技术 13.2003,(13),58-59. * |
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