CN1263245C - Devices and method for testing speed and quality of communication system - Google Patents
Devices and method for testing speed and quality of communication system Download PDFInfo
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- CN1263245C CN1263245C CNB2003101119912A CN200310111991A CN1263245C CN 1263245 C CN1263245 C CN 1263245C CN B2003101119912 A CNB2003101119912 A CN B2003101119912A CN 200310111991 A CN200310111991 A CN 200310111991A CN 1263245 C CN1263245 C CN 1263245C
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Abstract
The present invention discloses a device and a method for detecting the velocity and the quality of a communication system. The device of the present invention comprises a de-repeater (202), a decoder (204), a delay unit (208), a correlator (210), a velocity detector (212), a frame data buffer (214) and an encoding and checking unit (206), wherein the encoding and checking unit (206) also comprises a CRC encoding and checking unit (302) and an encoder (304). The present invention effectively reflects the correction of frame decoding results, and enhances the accuracy of frame velocity detection under the condition without enhancing the complexity of the system.
Description
Technical field
The present invention relates to communication system, relate in particular to speed and quality testing in CDMA (code division multiple access) communication system.
Background technology
Cdma system is an a kind of self-interference system, and promptly each user's signal all is to disturb concerning other user, and for a user, accounts for very big ratio from other user's interference in total interference.Therefore, the phase mutual interference between this user must limit the capacity of cdma system.
In order to increase power system capacity, cdma system is used multiple technologies when guaranteeing communication quality, reduce user's transmitting power.The variable Rate communication mode that local channel adopted in cdma system wants the difference of information transmitted amount to transmit with different speed according to every frame exactly, thereby transmitting power is reduced.Such as, two kinds of IS-95 systems of typical C DMA system and CDMA2000 system, its agreement regulation basic service sends with each four kinds variable speed of two kinds of rate set, these four kinds of speed are called full rate, half rate, 1/4 speed and 1/8 speed, wherein, four kinds of speed of rate set 1 are respectively: 9600bps (full rate), 4800bps (half rate), 2400bps (1/4 speed) and 1200bps (1/8 speed), four kinds of speed: 14400bps (full rate) of rate set 2,7200bps (half rate), 3600bps (1/4 speed) and 1800bps (1/8 speed).In Speech Communication, transmit voice signal with full rate and half rate frame usually, transmit the background sound signal with 1/4 speed and 1/8 speed, so both guaranteed the quality of communication, reduced transmitting power again, reduced the phase mutual interference between the user.
Because what receiver received is the Frame of variable bit rate, and when the variation of frame rate took place at every turn, receiver can't be notified accordingly, therefore, in order to guarantee to be correctly decoded, must right judgement be arranged to frame rate.In addition, reasons such as decline owing to interference of noise and signal, the signal of signal that receiver is received and transmitter emission has certain deviation, equally, the output signal of the input signal of decoder and the encoder of transmitting terminal also has deviation, when this deviation arrives to a certain degree greatly, just can not correctly recover source signal by decoder, just there is errored bit in the decoded data.For general communication system, a Frame is made up of information bit and certain redundant data bit, if having errored bit in the information bit that decoding obtains, such frame just is called the mistake frame.In order to make the correct result of decoder output, not only to judge also to judge (whether being the mistake frame) to the frame quality to frame rate.
Whether the detection of frame quality accurately has tangible influence to communication quality.Remove to recover voice signal with the Frame that has errored bit, communication quality is seriously descended, and adopt some technology that this frame is handled, as having the frame deletion of errored bit, utilize near the information of other frame this frame to replace the methods such as information of this frame, this mistake frame is reduced greatly to the influence of communication quality.If but the correct frame of will decoding is judged and is become the mistake frame, not only wasted useful information, reduced communication quality, and can improve frame error rate, the exterior ring power control of cdma system is adjusted according to frame error rate, the raising of frame error rate may cause transmitter to improve transmitting power, brings unnecessary interference so just can for other user.
Receiver need be taked certain measure, to guarantee the correct detection to frame rate and frame quality.In general, the rate detection algorithm all is to find some can reflect measuring of rate variation, judges present rate by the size of these measurement values.And in fact, these are measured and often can reflect frame rate, also can reflect the frame quality, so the detection of frame rate and frame quality generally combines and carry out, and for the variable Rate communication system, usually said frame rate detects the detection that has also comprised the frame quality.For the fixed rate communication system, then only need the judgment frame quality.
Except information bit, comprise the data bit that some are redundant in order to carry out error correction or error detection toward contact in the Frame, CRC (Cyclic Redundancy Code, cyclic redundancy check (CRC) code) bit is exactly wherein a kind of.Can obtain frame quality information more accurately by CRC check, simultaneously, if generally also can't pass through CRC check according to the frame rate of the mistake gained data of decoding, thereby the CRC indication also can reflect frame rate.Because the accuracy of CRC check is higher, present various speed detection methods are all measured the CRC indication as an important detection.But CRC check is not an entirely accurate, the information bit decoding error both can occur but by CRC check, and the information bit decoding also can take place correctly but can't be by the situation (the check bit partial decoding of h occurs wrong) of CRC check.For the previous case, general rate detection algorithm all identifies this mistake frame by adding measuring of other; But for latter event, because used measuring at present all is difficult to correctly to identify this good frame by CRC check with not ing, so most rate detection algorithm all is used as it by mistake frame and is directly deleted.
For example, the patent US6 of Qualcomm, 175,590, " METHOD AND APPARATUSFOR DETERMINING THE RATE OF RECEIVED DATA IN A VARIABLE RATECOMMUNICATION SYSTEM ", proposed the Frame that receives is decoded respectively according to four kinds of speed, the data after each is decoded obtain sequence X with the convolution coder recompile of this speed correspondence
i(i gets 0-3 and represents four kinds of speed respectively) postpones to obtain the preceding sequence Y that decodes by the input with decoder
i, try to achieve L according to formula (1)
i:
N is the symbolic number in the frame in the formula, R
iThe digital coding rate.The L of two serial correlations will be represented
iMeasure as a rate detection, simultaneously, every kind of speed also has own CRC indication, Yamamoto quality indication etc. to measure, and these measure a detection that is used from frame rate and quality, can improve the accuracy to above first kind of situation detection like this.But because this circuit correlation measure not have help to the detection of second kind of situation, therefore, this patent also will be used as the adequate condition of delete frame by CRC check, if just a frame can't just be used as it by CRC check and miss frame deletion.Just do not illustrate in this frame in fact and have errored bit by CRC check, but be not that to have this frame of errored bit in the decoded result of a frame be exactly useless mistake frame, in one frame except information bit, also there are redundant data bits such as check bit, the purpose of communication is to transmit information bit, if therefore errored bit is in the redundant data, this frame obviously should not be used as the mistake frame and handle.
Summary of the invention
Purpose of the present invention: be in order to solve in the existing speed detection method, measure owing to lack effectively to detect, can't correctly discern not by the good frame (the information bit partial decoding of h is correct) in the frame of CRC check and miss frame, thus cause to frame rate and the not accurate enough problem of frame quality testing.
For achieving the above object, the present invention has constructed the speed and the quality detection device of communication system, comprising: separate duplicator, decoder, delay cell, correlator, rate detector and frame data buffer, it is characterized in that also comprising coding and verification unit.Wherein, the described duplicator of separating is separated repetition according to various possible speed to the input data, and the result who separates repetition sends into described decoder and described delay cell respectively; Described decoder is finished the decoding to the input data, and decoded result is sent into respectively in coding and verification unit and the described frame data buffer; Described coding and verification unit comprise CRC coding and verification unit and encoder, described CRC coding and verification unit regenerate the CRC bit according to the input data, information bit that decoding is obtained and new CRC bit output to described encoder, this unit also carries out CRC check to the input data, check results is sent in the described rate detector, described encoder is corresponding with described decoder, will import the data recompile, and its result sends into described correlator; Described delay cell will be imported data and carry out sending into described correlator after the delay of certain hour; Described correlator carries out related operation to the two paths of data of input and obtains the correlation indicated value, and this value is sent into described rate detector; Described rate detector carries out rate detection according to the input indication, and testing result is sent into described frame data buffer; Described frame data buffer is imported corresponding data according to testing result.
For achieving the above object, the invention allows for the speed and the quality determining method of communication system:
The first step is separated duplicator and decoder the input data is separated repetition and decoding (if variable rate frame may speed be separated repetition and decoding respectively according to various; If the fixed rate frame is separated repetition and decoding according to this speed).
Second step, the CRC that the data of decoding gained are sent in coding and the verification unit encodes and verification unit, regenerate the CRC bit according to the information bit in the decoded data, information bit in newly-generated CRC bit and this unit list entries is formed new data sequence, this sequence is sent into the encoder recompile obtain new symbol sebolic addressing Y
i', every kind of value of i is represented a kind of speed; Decoded data is carried out CRC check, and with check results C
iSend into rate detector.
The 3rd step is after the data sequence before the decoding postponed by delay cell, with the second sequence Y that generated of step
i' be admitted to correlator together and carry out related operation, and the result is carried out normalized, correlation indication L after the normalization
iBe admitted to rate detector as measuring of frame rate and quality testing.
In the 4th step, carry out frame rate and frame quality and judge.
One, for the variable Rate communication system, rate detector is pressed following principle judgment frame speed and frame quality:
1. determine which plants data that speed decodes by CRC check according to, and the number of record by the speed of verification (promptly value is 1 C
iNumber).
2.,, therefrom choose correlation indication L for speed by CRC check if there is decoded data can pass through CRC check
iMaximum as most probable speed (if having only a kind of speed, directly with this speed as most probable speed), if this correlation indicated value greater than a predefined constant, then is judged to frame rate with this frame rate by CRC check; Otherwise, this frame rate is judged to delete frame.
3. if the decoded data of various speed is not all by CRC check, with the L of each speed
iWith a predefined constant T
i(the corresponding Ti of each Li) compares, if find a kind of L of speed
iGreater than T
iPromptly stop comparison, and this speed is judged to frame rate; If there is not a kind of L of speed
iGreater than T
i, then this frame is judged to delete frame.
Two, for the fixed rate communication system, rate detector is pressed following principle judgment frame quality: if decoded data passes through CRC check, perhaps circuit correlation measure L judges then that greater than a predefined constant this frame decoding is correct, otherwise is judged to the mistake frame.
It should be noted because the present invention partly improves circuit correlation measure by the check bit that changes in the correlated series, thereby improved effect can be with the difference of check bit proportion in a frame difference.Specifically, be exactly that check bit proportion in a frame is big more, improved effect is obvious more.
The present invention is by carrying out the information bit in the decoded result again the CRC coding, and form a new sequence with data division of decoding and newly-generated CRC check sign indicating number and send into encoder, having obtained a new correlation frame rate detection with the data before the decoding in this sequence and the delay cell as related operation measures, measure with existing rate detection and to compare, this measures the quality that can more effectively reflect not by the frame data of CRC check.Substitute traditional circuit correlation measure by measuring, can under the situation that does not improve system complexity, improve the accuracy that frame rate detects with this.
Description of drawings
Fig. 1 is that the R2 of CDMA2000 system (Radio Configuration 2, radio configuration 2) receives structure chart.
Fig. 2 is the speed and the quality detection device structure chart of communication system of the present invention.
Fig. 3 is coding of the present invention and verification unit structure chart.
Fig. 4 is the speed and the quality determining method flow chart of communication system of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further details.In the present embodiment, travelling carriage has the vocoder of a rate-compatible, and it is rate, 1/2 speed, 1/4 speed or 1/8 speed work at full speed.Fig. 1 is that the RC2 of CDMA2000 system receives structure chart, the wireless signal that demodulator 102 receives has experienced various losses when passing through wireless channel, as path loss, multipath fading etc., the processing that 102 pairs of demodulators receive data comprises that multipath merges, demodulation is separated the long code scrambler and is conciliate processes such as quadrature modulation.The effect of deinterleaver 104 is the dateout deinterleavings to demodulator 102, rate detection and decoder 106 are determined the most probable speed of present frame according to the dateout of deinterleaver 104, and the quality of definite this frame, if determining this frame is not the mistake frame, the decoded result of this speed correspondence is sent into vocoder 108 do last sound code conversion processing, otherwise reporting system is deleted this frame.
The speed of communication system of the present invention and quality detection device structure are as shown in Figure 2.Rate detection and decoder 106 are by separating duplicator 202, decoder 204, coding and verification unit 206, delay cell 208, correlator 210, rate detector 212 and frame data buffer 214 compositions.The input data are separated repetition by separating duplicator 202 according to various possible speed, and the data of separating after the repetition are sent into decoder 204 decodings, and these data also are admitted to delay cell 208 simultaneously; 204 pairs of each roads of decoder are separated repeating data and are decoded simultaneously, and its decoded result is kept in the frame data buffer 214; Simultaneously, decoded result also is admitted to coding and verification unit 206, and this unit produces check bit again according to the information bit in the decoded data, on the one hand decoded data is carried out CRC check, and with check results C
i(i value 0,1,2,3 is represented four kinds of speed respectively) sends into rate detector 212, on the other hand, with the check bit in the check bit replacement decoded data of new generation, thereby form a new data sequence, and this sequence carried out convolutional encoding again, encoder 304 is corresponding with decoder 204, and four kinds of encoders wherein correspond respectively to four kinds of speed, and its coding result is sent into correlator 210; At this moment, the repeating data sequence of separating of this frame is also sent into correlator 210 through delay cell 208, and 210 pairs of two sequences of correlator are carried out related operation, and obtains the correlation indication L of each speed
i, this indicated value is admitted to rate detector 212; Rate detector 212 is according to L
iAnd C
iFrame rate and frame quality are judged, and judged result is sent in the frame data buffer 214; Frame data buffer 214 is given vocoder (or reporting system is deleted this frame) according to the testing result of rate detector 212 with the decoded data of respective rate.
The speed of communication system of the present invention and quality determining method flow process are as shown in Figure 4.Testing process is from step 402, and in the step 404, rate detector 212 receives CRC check indication C
iWith the output L that comes autocorrelator 210
iIn step 406, find out speed by CRC check, promptly the value of selecting is 1 C
i, and write down its number k; Step 408 judges whether k is 0, if k is not 0, promptly has a kind of speed at least by CRC check, then therefrom selects maximum correlation indication L
iIf, L
iGreater than predefined constant, then export the speed R of this frame
i, otherwise this frame of reporting system should be deleted; If k is 0, then judged whether L by step 418
iT greater than correspondence
i, as long as find to have a L
iGreater than T
i, then judgment frame speed is R
i, otherwise, judge that still this frame should delete.
What provide previously is that a specific embodiment illustrates and described the present invention.Because the detection to the frame quality extensively is present in the various communication systems, about the part of frame quality testing, both can be applied to the frame rate and the frame quality testing of variable Rate communication among the present invention, also can be used for fixing the frame quality testing of rate communication.Improved circuit correlation measure among the present invention is not limited in algorithm of the present invention and device, and other speed detection method or device also can adopt the circuit correlation measure among the present invention to improve the accuracy rate of frame rate and quality testing.
The present invention can be applied to the frame rate and the quality testing of various radio configuration in the cdma system, comprises forward link and reverse link, is not limited only to cdma system simultaneously.
Claims (6)
1, a kind of speed of communication system and quality detection device comprise: separate duplicator (202), decoder (204), delay cell (208), correlator (210), rate detector (212), frame data buffer (214), it is characterized in that, also comprise coding and verification unit (206);
The described duplicator (202) of separating is used for according to various possible speed the input data being separated repetition, and the result who separates repetition sends into described decoder (204) and described delay cell (208) respectively;
Described decoder (204) is used to finish the decoding to the input data, and decoded result is sent into respectively in described coding and verification unit (206) and the described frame data buffer (214);
Described delay cell (208) is used for carrying out sending into described correlator (210) after the delay of certain hour with importing data;
Described correlator (210) is used for that the two paths of data of input is carried out related operation and obtains the correlation indicated value, and this value is sent into described rate detector (212);
Described rate detector (212) is used for carrying out rate detection according to the input indication, and testing result is sent into described frame data buffer;
Described frame data buffer (214) is used for according to testing result input corresponding data;
Described coding and verification unit (206) are used for data bit is carried out recompile, and the result is sent into described correlator (210); The input data are carried out CRC check, assay is sent into described rate detector (212).
2, the speed of communication system as claimed in claim 1 and quality detection device is characterized in that, described coding and verification unit (206) comprising:
(1) CRC coding and verification unit (302), be used for regenerating the CRC bit according to the input data, information bit and new CRC bit that decoding is obtained output to described encoder (304), and the input data are carried out CRC check, and check results is sent into described rate detector (212);
(2) encoder (304) is used for input data recompile, and its result sends into described correlator (210).
3, a kind of speed of communication system and quality determining method may further comprise the steps:
(1) separate duplicator (202) and decoder (204) the input data separated repetition and decoding., if variable rate frame may speed be separated repetition and decoding respectively according to various; If the fixed rate frame is separated repetition and decoding according to this speed;
(2) will the decode data of gained are sent into CRC coding and verification unit (302), the data sequence after the processing is sent into encoder (304) recompile obtain new symbol sebolic addressing Y
i', every kind of value of i is represented a kind of speed; And decoded data carried out CRC check, and with check results C
iSend into rate detector (212);
(3) after the data sequence before will decoding postpones by delay cell (208), with the sequence Y of step (2) generation
i' be admitted to correlator (210) together and carry out related operation, and the result is carried out normalized, correlation indication L after the normalization
iBe admitted to rate detector (212) as measuring of frame rate and quality testing;
(4) carrying out frame rate and frame quality judges:
(401) for the variable Rate communication system, rate detector (212) is judged frame rate;
(402) for the fixed rate communication system, rate detector (212) is judged the frame quality.
4, the speed of communication system as claimed in claim 3 and quality determining method, it is characterized in that, data sequence after handling in the described step (2) is that CRC coding and verification unit (302) regenerate the CRC bit according to the information bit in the decoded data, with the new data sequence of the composition of the information bit in newly-generated CRC bit and this unit list entries.
5, the speed of communication system as claimed in claim 3 and quality determining method is characterized in that, described method (401) comprising:
(1) determine to pass through CRC check, and record is by the number of the speed of verification according to the data which kind speed is decoded;
(2),, therefrom choose correlation indication L for speed by CRC check if there is decoded data can pass through CRC check
iMaximum as most probable speed, when having only a kind of speed by CRC check, directly with this speed as most probable speed, if this correlation indicated value greater than predefined constant, then is judged to frame rate with this speed; If this indicated value is less than or equal to predefined constant, then be judged to delete frame;
(3) if the decoded data of various speed does not all pass through CRC check, with the L of each speed
iWith corresponding constant T
iRelatively, each L
iCorresponding T
iIf find a kind of L of speed
iGreater than T
iPromptly stop comparison, and this speed is judged to frame rate; If there is not a kind of L of speed
iGreater than T
i, then this frame is judged to delete frame.
6, the speed of communication system as claimed in claim 3 and quality determining method is characterized in that, described method (402) comprising:
(1) if decoded data passes through CRC check, perhaps circuit correlation measure L judges then that greater than predefined constant this frame decoding is correct;
(2) decoded data is by CRC check, and circuit correlation measure L is less than or equal to predefined constant, then is judged as the mistake frame.
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