CN102546085B - Method for adding Bose-Chaudhur-Hocquenghem (BCH) error-correcting code to detection frame of high performance network over coax (HINOC) system - Google Patents
Method for adding Bose-Chaudhur-Hocquenghem (BCH) error-correcting code to detection frame of high performance network over coax (HINOC) system Download PDFInfo
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Abstract
The invention discloses a method for adding a Bose-Chaudhur-Hocquenghem (BCH) error-correcting code to a detection frame of a high performance network over coax (HINOC) system. The method comprises the following steps of: performing BCH coding between scrambling and symbol mapping at a sending end of the system; performing BCH decoding between differential quadrature phase shift keying (DQPSK) demodulation and descrambling at a receiving end of the system; and processing the detection frame in three BCH coding modes, wherein the BCH coding and the BCH decoding are not performed in a mode 0, BCH shortened codes of which parameters are (508, 472) and the error correcting capability is 4 bits are adopted in a mode 1, and the BCH shortened codes of which the parameters are (504, 432) and the error correcting capability is 8 bits are adopted in a mode 2. By adoption of the method, the HINOC system can normally work under the condition of serious multi-path interference or single-frequency interference.
Description
Technical field
The present invention relates to high-performance coaxial network (HINOC) the access technology field based on coaxial cable, particularly relate to a kind of method that explore frame to HINOC system adds Bose-Chaudhuri Hocquenghem error correction codes.
Prior art
HINOC technology is a kind of cable television network coaxial cable that utilizes, and realizes the broadband access technical solution scheme of high-performance bidirectional transfer of information.The grid maximum coverage range that adopts this technology be hundreds of rice to a km, frequency range is 750MHz～1006MHz, retains more low-frequency range and the more extensibility of high band.Adopt OFDM (OFDM) transmission means, TDD (time division duplex)/TDMA (time division multiplexing) duplex/multi-access mode.HINOC system protocol stack as shown in Figure 1.The signal transfer mode of physical layer (PHY layer) definition comprises frame structure, chnnel coding and modulation technique.The medium access that medium access control layer (MAC layer) is realized in HINOC network is controlled and business adaption function, is divided into common part sublayer (CPS) and two sublayers of convergence sub-layer (CS).CPS realizes the Core Features such as the access control of MAC layer and channel allocation, and CS realizes the adaptation of MAC layer Core Feature and high layer function.
HINOC physical layer is divided into four kinds of frames: descending explore frame (Pd frame), uplink detection frame (Pu frame), downlink data frame (Dd frame) and uplink data frames (Du frame).Frame (Dd frame, Du frame) is for transmission system upper layer data information, system can be according to concrete channel conditions, and adaptive selection selects the Different Modulations such as QPSK (quadriphase PSK), 8QAM (8 ary quadrature Modulation and Amplitude Modulation)～1024QAM (1024 ary quadrature Modulation and Amplitude Modulation) to modulate independently to each subcarrier of Frame.Explore frame (Pd frame, Pu frame) for command transmitting information, fix by the data length of a frame, and system adopts DQPSK (difference quadrature phase shift keying) modulation system.DQPSK modulation system antijamming capability is strong, adopts non-coherent demodulation mode, insensitive to carrier wave frequency deviation, and demodulation is convenient, simple in structure, easily realizes.Receiving terminal in system does not need to do to the received signal complicated channel estimating and equilibrium treatment, has improved the robustness of system when having reduced the complexity of receiver.
Explore frame utilizes two OFDM symbols of frame to transmit signaling information on the one hand; On the other hand, in HINOC system, there is no pilot tone, clock skew estimation, Frequency offset estimation and channel transfer characteristic estimation etc. are all that the OFDM symbol based on explore frame frame adopts decision-directed algorithm to estimate conventionally.If there is more error code in explore frame, because error propagation (Error Propagation) effect can have a strong impact on the performance of decision-directed algorithm, cause receiving terminal cannot carry out correct channel training, thereby cause system cannot set up initial synchronisation.Further, access terminal equipment must correctly be decoded to the signaling information carrying in descending explore frame, can correctly obtain system broadcast information, thereby sets up normal communication connection with Centroid.If there is error code in explore frame, access terminal and cannot set up normal communication connection with Centroid, therefore cannot realize network insertion.
While existing serious multipath to disturb in system, can cause some subcarrier to be absorbed in frequency domain deep fade interval; Or while existing larger single-frequency to disturb in system, the entrained signal of subcarrier of corresponding frequency is submerged in interference signal completely.In both cases, it is very low that the signal to noise ratio of relevant subcarrier all can become, and the error rate of the data symbol transmitting is also very high.In HINOC technology, Frame can resist single-frequency interference or serious multipath interference effectively by adaptive modulation system (adopt low-order-modulated mode to being disturbed subcarrier, or shielding being disturbed subcarrier).But explore frame cannot adopt Adaptive Modulation mechanism, although the modulation system of DQPSK can be resisted interference to a certain extent, it is limited in one's ability, and when serious interference, explore frame error code is more, and system cannot normally be worked at all.Can find out, serious multipath is disturbed explore frame and the power of the antagonism that single-frequency is disturbed has crucial impact to the normal operation of HINOC system.
BCH code is a kind of error control coding being widely used in communication system, and it is an important subclass of cyclic code, has the ability of entangling a plurality of mistakes.The algebraic process of BCH code based on tight, code efficiency is higher, between its generator polynomial and minimum distance, there is close contacting, can be according to the error correcting capability structure BCH code of actual requirement, the research of its decoding algorithm is one of important topic of coding theory research always, be the most detailed class code being most widely used of studying at present, proposed up to now multiple decoding algorithm.
The parameter of BCH code is (n, k), n refers to the code word size after coding, general n=2m-1, k is the length of the information bit before encoding, the check digit that n-k encoder adds (being also redundant digit) length, the error correcting capability t of BCH code is also a parameter of BCH code, its code word size n, length k of information bit before coding after with coding is relevant.When code length, n is larger, and the scope of selectable error correcting capability t is larger.And after determining n, more error correcting capability t is less for k, otherwise stronger.Different generator polynomial corresponding to parameter.Therefore,, by the setting to n, k, t, can produce different BCH code to meet the demand of different application occasion.
Existing HINOC system has adopted BCH encoding and decoding to Frame, and provides 3 kinds of coding modes to adapt to different applied environments: pattern 0 is not for adopting Bose-Chaudhuri-Hocquenghem Code; Pattern 1 is that (508,472) error correcting capability is the BCH shortened code of 4 bits for adopting parameter; Pattern 2 is that (504,432) error correcting capability is the BCH shortened code of 8 bits for adopting parameter.And existing system does not adopt BCH encoding and decoding to explore frame.
In existing HINOC technology, the frame structure of explore frame is divided into targeting sequencing and load patch.Load patch is comprised of 784 Bit datas of regular length, comprises the check code of 752 bit signalling data and 32 bits.In order to improve the antijamming capability of explore frame, system is inserted 56 bit protection fields in 784 Bit datas.The signaling frame of 784 bits is equally divided into 4 sections, inserts successively in " signaling data " unit shown in Fig. 8, form the data of 840 bit lengths.Insert protected field 840 Bit datas afterwards and carry out again the processing such as scrambler, DQPSK modulation.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of method that explore frame to HINOC system adds Bose-Chaudhuri Hocquenghem error correction codes, and assurance system also can normally be worked when existing serious multipath to disturb or single-frequency disturbs.
For addressing the above problem, the present invention adds the method for Bose-Chaudhuri Hocquenghem error correction codes to the explore frame of HINOC system, is to adopt following technical scheme to realize:
Between the scrambling processing of system transmitting terminal and sign map are processed, inserting Bose-Chaudhuri-Hocquenghem Code processes; Between the DQPSK of system receiving terminal demodulation process and scramble process, inserting BCH decoding processes;
The load patch data of one frame explore frame are divided into two sections and carry out Bose-Chaudhuri-Hocquenghem Code, form two Bose-Chaudhuri-Hocquenghem Code data blocks; Described load patch data are the signaling data that is inserted with protected field; Bose-Chaudhuri-Hocquenghem Code data block 1 consists of protected field 11, signaling data section 11, protected field 12 and signaling data section 12; Bose-Chaudhuri-Hocquenghem Code data block 2 consists of protected field 21, signaling data section 21, protected field 22 and signaling data section 22.
To described explore frame, adopt 3 kinds of Bose-Chaudhuri-Hocquenghem Code patterns to process: pattern 0 does not adopt BCH encoding and decoding; It is that (508,472), error correcting capability are the BCH shortened code of 4 bits that pattern 1 adopts parameter; It is that (504,432), error correcting capability are the BCH shortened code of 8 bits that pattern 2 adopts parameter;
The input data that described Bose-Chaudhuri-Hocquenghem Code is processed are carried out the data recombination of following mode;
During employing pattern 0, data do not participate in BCH encoding and decoding, do not process;
During employing pattern 1, adopting parameter is the BCH shortened code of (508,472), and the length of input data is 472 bits; Scrambling is processed to 376 Bit datas of output and added 96 bits 0, form the data block of 472 bits as the input data of Bose-Chaudhuri-Hocquenghem Code processing under this pattern;
During employing pattern 2, adopting parameter is the BCH shortened code of (504,432), and the length of input data is 432 bits; Scrambling is processed to 340 Bit datas of output and added 92 bits 0, form the data block of 432 bits as the input data of Bose-Chaudhuri-Hocquenghem Code processing under this pattern;
The output data that described Bose-Chaudhuri-Hocquenghem Code is processed are carried out the data recombination of following mode;
During employing pattern 0, data do not participate in Bose-Chaudhuri-Hocquenghem Code, do not process;
During employing pattern 1, adopting parameter is the BCH shortened code of (508,472), and the data length of coding output is 508 bits; Remove 96 bits 0 of adding before coding, intercepting 412 Bit datas, and 8 bit protection fields after processing through scrambling, the data of formation 420 bits on add the back of 412 Bit datas; Again the data of two section of 420 bit are combined into the data block of 840 bits, the input data of processing as sign map;
During employing pattern 2, adopting parameter is the BCH code of (504,432), and the data length of coding output is 504 bits; Remove 92 bits 0 of adding before coding, intercepting 412 Bit datas, and 8 bit protection fields after processing through scrambling, the data of formation 420 bits on add the back of 412 Bit datas; Again the data of two section of 420 bit are combined into the data block of 840 bits, the input data of processing as sign map.
Explore frame to HINOC system provided by the invention adds the method for Bose-Chaudhuri Hocquenghem error correction codes, making explore frame can very effectively resist serious multipath interference and single-frequency disturbs, solved HINOC system and cannot normally work when there is above-mentioned interference, accessed terminal and even cannot access the problem of HINOC network.Simultaneously the present invention designs for the architectural characteristic of the explore frame of existing HINOC technology specially, and the original architecture of minimal adjustment, reduces the increase of implementation complexity to greatest extent, makes system simple.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and embodiment, the present invention is further detailed explanation:
Fig. 1 is HINOC system protocol stack;
Fig. 2 has adopted explore frame of the present invention to send, receive signal to process block diagram;
Fig. 3 is that signaling data section of the present invention is filled and Bose-Chaudhuri-Hocquenghem Code data block partitioning scheme schematic diagram;
Fig. 4 has adopted coding mode 1 coding front and back data segment restructuring flow chart of the present invention;
Fig. 5 has adopted coding mode 2 coding front and back data segment restructuring flow charts of the present invention;
Fig. 6 has adopted coding mode 1 decoding front and back data segment restructuring flow chart of the present invention;
Fig. 7 has adopted coding mode 2 decoding front and back data segment restructuring flow charts of the present invention;
Fig. 8 is signaling data section filling mode schematic diagram in existing HINOC technology.
Embodiment
For the explore frame of HINOC system, method of the present invention adds respectively Bose-Chaudhuri-Hocquenghem Code to process and BCH decoding processing at transmitting terminal and the receiving terminal of HINOC system.Figure 2 shows that the explore frame signal transmitting and receiving processing block diagram based on HINOC modulator-demodulator of the present invention.As shown in Figure 2, between the scrambling processing of system transmitting terminal and sign map are processed, inserting Bose-Chaudhuri-Hocquenghem Code processes; Between the DQPSK of system receiving terminal demodulation process and scramble process, inserting BCH decoding processes.
Based on this structure, the invention provides three kinds of alternative Bose-Chaudhuri-Hocquenghem Code patterns: pattern 0 does not adopt Bose-Chaudhuri-Hocquenghem Code; It is that (508,472), error correcting capability are that the BCH shortened code of 4 bits is carried out encoding and decoding that pattern 1 adopts parameter; It is that (504,432), error correcting capability are that the BCH shortened code of 8 bits is carried out encoding and decoding that pattern 2 adopts parameters.3 kinds of BCH encoding/decoding modes provided by the invention, can adapt to different operational environments, have improved the flexibility of system.In order to make that the modification of existing HINOC technological system structure is minimized, as a kind of preferred embodiment, three kinds of Bose-Chaudhuri-Hocquenghem Code patterns that the present invention adopts explore frame are identical with three kinds of Bose-Chaudhuri-Hocquenghem Code patterns that Frame in existing HINOC technology adopts.
As shown in Figure 3, for guaranteeing not original protected field in tamper detection frame, guarantee that protected field numerical value in transmitting procedure is known determined value, the load patch data of a frame explore frame are divided into two sections and carry out Bose-Chaudhuri-Hocquenghem Code, form two Bose-Chaudhuri-Hocquenghem Code data blocks.Bose-Chaudhuri-Hocquenghem Code data block 1 consists of protected field 11, signaling data section 11, protected field 12, signaling data section 12.Bose-Chaudhuri-Hocquenghem Code data block 2 consists of protected field 21, signaling data section 21, protected field 22, signaling data section 22.
At transmitting terminal, for guaranteeing that a frame explore frame data length of Bose-Chaudhuri-Hocquenghem Code output is fixed as 840 bits (length of 2 OFDM symbols), in frame data, signaling data total length changes along with different Bose-Chaudhuri-Hocquenghem Code patterns.
As shown in Figure 3, due to the change of signaling data total length, different before inserting the rule of protected field and do not add Bose-Chaudhuri-Hocquenghem Code in signaling data.Each protected field still remains unchanged, but the length of signaling data section 12 and signaling data section 22 changes along with the difference of Bose-Chaudhuri-Hocquenghem Code pattern.
Due to the variation of signaling data length, the data length that scrambling is processed also changes with the difference of Bose-Chaudhuri-Hocquenghem Code pattern.Being the input data length processed of scrambling and output data length changes with the variation of Bose-Chaudhuri-Hocquenghem Code pattern.
The input data that Bose-Chaudhuri-Hocquenghem Code is processed are carried out the data recombination of following mode:
When Bose-Chaudhuri-Hocquenghem Code is pattern 0, data do not participate in Bose-Chaudhuri-Hocquenghem Code, do not need to process.
When Bose-Chaudhuri-Hocquenghem Code is pattern 1, adopting parameter is the BCH shortened code of (508,472), and the length of inputting data should be 472 bits; And the coded data length of actual scrambling processing output is 376 bits, in the front of 376 Bit datas, add 96 bits 0, form the data block (idiographic flow is referring to Fig. 4) of 472 bits.
When Bose-Chaudhuri-Hocquenghem Code is pattern 2, adopting parameter is the BCH shortened code of (504,432), and the length of inputting data should be 432 bits; And the coded data length of actual scrambling processing output is 340 bits, in the front of 340 Bit datas, add 92 bits 0, form the data block (idiographic flow is referring to Fig. 5) of 432 bits.
The output data that Bose-Chaudhuri-Hocquenghem Code is processed are carried out the data recombination of following mode:
When Bose-Chaudhuri-Hocquenghem Code is pattern 0, data do not participate in Bose-Chaudhuri-Hocquenghem Code, do not need to process.
When Bose-Chaudhuri-Hocquenghem Code is pattern 1, adopting parameter is the BCH shortened code of (508,472), and the data length of coding output is 508 bits, and its data structure is that 96 Bit data 0,376 Bit datas and 36 bit Bose-Chaudhuri-Hocquenghem Codes are processed the check bit producing.Remove 96 bits 0 that supplement before coding, intercepting 412 Bit datas.And 8 bit protection fields 13 or protected field 23 (in conjunction with Fig. 3) after processing through scrambling on add each section 412 Bit data back, the data of formation 420 bits.Again the data of two section of 420 bit are combined into the data block of 840 bits, the input data (idiographic flow is referring to Fig. 4) of processing as sign map.
When Bose-Chaudhuri-Hocquenghem Code is pattern 2, adopting parameter is the BCH shortened code of (504,432), and its data structure is that 92 Bit data 0,340 Bit datas and 72 bit Bose-Chaudhuri-Hocquenghem Codes are processed the check bit producing.Remove 92 bits 0 that supplement before coding, intercepting 412 Bit datas.And 8 bit protection fields 13 or protected field 23 (in conjunction with Fig. 3) after processing through scrambling on add each section 412 Bit data back, the data of formation 420 bits.Again the data of two section of 420 bit are combined into the data block of 840 bits, the input data (idiographic flow is referring to Fig. 5) of processing as sign map.
In the present invention, corresponding with the handling process of transmitting terminal, the handling process of receiving terminal is as described below:
At receiving terminal, the data for the output of DQPSK demodulation module, write corresponding given data in the position of corresponding protected field, again to guarantee that error code does not appear in protected field.If error code appears in protected field, and number of bit errors surpasses the error correcting capability under present encoding pattern, and BCH decoding process module likely can be corrected mistakes the correct valid data outside protected field, causes current data block to occur bit mistake.Rewrite protected field and can effectively avoid this kind of situation.The data length that under different coding pattern, scrambling is processed is different, causes protected field value corresponding after sign map also different, so the data of protected field change along with different Bose-Chaudhuri-Hocquenghem Code patterns.These data can be calculated in advance and be stored in HINOC modulator-demodulator, in actual transmitting-receiving is processed, according to Bose-Chaudhuri-Hocquenghem Code model selection, use.At receiving terminal, the data source that the various algorithm for estimating based on decision-directed mode need is to remove Data Modulation information channel information afterwards, data after DQPSK demodulation are carried out to remodulates, and the data that remodulates is obtained are carried out related operation with reception data can obtain channel information.System writes corresponding given data again to the data corresponding to protected field in the input data of remodulates; to guarantee that protected field is without error code, thereby the estimation that various algorithm for estimating are carried out on the shared subcarrier of protected field is not to be subject to channel interference effect.Due to the difference of scrambling deal with data length under different B CH coding mode, the data of above-mentioned protected field are also different.These data can be calculated in advance and be stored in HINOC modulator-demodulator, in actual transmitting-receiving is processed, according to Bose-Chaudhuri-Hocquenghem Code model selection, use.
The input data that decoding is processed to BCH are carried out the data recombination of following mode:
When BCH is decoded as pattern 0, data needn't be carried out BCH decoding, do not need to process.
When BCH is decoded as pattern 1, the input data length that BCH decoding is processed should be 508 bits.The data length of DQPSK demodulation module output is 840 bits; the length of each section of decoding input data is (420-8)=412 bit (8 bit protection fields 13 and protected field 23 do not participate in encoding and decoding), and 412 Bit datas comprise 376 bit real data and 36 bit check bits.In 412 Bit data fronts, add 96 bits 0, form the input data (idiographic flow is referring to Fig. 6) of the BCH decoding processing of 508 bits.
When BCH is decoded as pattern 2, the input data length that BCH decoding is processed should be 504 bits.The data length of DQPSK demodulation output is 840 bits; the length of each section of decoded data is (420-8)=412 bit (8 bit protection fields 13 and protected field 23 do not participate in encoding and decoding), and 412 Bit datas comprise 340 bit real data and 72 bit check bits.Before 412 Bit datas, add 92 bits 0, form the input data (idiographic flow is referring to Fig. 7) of the BCH decoding processing of 504 bits.
The data of BCH decoding output are carried out to the data recombination of following mode:
When BCH is decoded as pattern 0, data needn't be carried out BCH decoding, do not need to process.
When BCH is decoded as pattern 1, the data length that output is processed in BCH decoding is 472 bits, comprising 96 Bit data 0,376 Bit datas.Remove 96 bits 0 of mending before decoding, 376 Bit datas that intercepting is actual required.And, 8 bit protection fields 13 or protected field 23 on add each section 376 Bit data back after process DQPSK demodulation; Again two sections of data that increased protected field are combined into a data block, as the input data (idiographic flow is referring to Fig. 6) of scramble process.
When BCH is decoded as pattern 2, the data length that output is processed in BCH decoding is 432 bits, comprising 92 Bit data 0,340 Bit datas.Remove 92 bits 0 of mending before decoding, 340 Bit datas that intercepting is actual required.And, 8 bit protection fields 13 or protected field 23 on add each section 340 Bit data back after process DQPSK demodulation; Again by two sections of synthetic data blocks of data chunk that increased protected field, as the input data (idiographic flow is referring to Fig. 7) of scramble process.
The signaling data length of the input data length of scramble process, scramble process output extracting data and the data length of CRC check input all change along with the difference of Bose-Chaudhuri-Hocquenghem Code pattern.These length can be calculated in advance and be stored in HINOC modulator-demodulator, in actual transmitting-receiving is processed, according to Bose-Chaudhuri-Hocquenghem Code model selection, use.
Because Bose-Chaudhuri-Hocquenghem Code pattern exists three kinds of possible selections, so receiving terminal must know that the Bose-Chaudhuri-Hocquenghem Code pattern that transmitting terminal adopts just can carry out correct decoding in some way.According to the solution of the present invention, receiving terminal can adopt one of following three kinds of modes to know or detect the Bose-Chaudhuri-Hocquenghem Code pattern that transmitting terminal adopts:
Mode one, receiving terminal and transmitting terminal arrange to adopt certain Bose-Chaudhuri-Hocquenghem Code pattern in advance.
Mode two, receiving terminal circulation adopt three kinds of corresponding decoding schemas to decode to received signal, and carry out follow-up descrambling, CRC check processing, according to CRC check result, determine correct Bose-Chaudhuri-Hocquenghem Code pattern.
Mode three, by correlation technique, detect the Bose-Chaudhuri-Hocquenghem Code pattern that transmitting terminal adopts.Under different Bose-Chaudhuri-Hocquenghem Code patterns; protected field value after processing through scrambling is different; by the known protected field sequence after scrambling is processed with receive protected field in signal and partly carry out related operation, getting the Bose-Chaudhuri-Hocquenghem Code pattern that can access maximum correlation peak is correct Bose-Chaudhuri-Hocquenghem Code pattern.
Shown in Fig. 2, according to the explore frame to HINOC system provided by the present invention, add the method for Bose-Chaudhuri Hocquenghem error correction codes, its explore frame signal sends, reception flow process is as described below.
At transmitting terminal; the signaling information that first system provides upper strata adds CRC check position; insert protected field; then carry out the steps such as scrambling, Bose-Chaudhuri-Hocquenghem Code processing, sign map and DQPSK modulation, OFDM modulation; insert again Cyclic Prefix; carry out framing etc., through up-sampling, filtering, Digital Up Convert (optional) and digital-to-analogue conversion etc., convert base band or analog intermediate frequency signal to, through AFE (analog front end) processing or radio frequency processing, send signal on channel.
At receiving terminal, the channel signal that system receives first through AFE (analog front end), processes or radio frequency processing converts base band or analog intermediate frequency signal to, then through analog-to-digital conversion process, convert digital signal to, through Digital Down Convert, process (optional) again, deflection correction during correcting frequency deviation, filtering, synchronously, the processing such as down-sampling and automatic gain control, then carry out OFDM demodulation, equilibrium and DQPSK demodulation etc., again through BCH decoding, the steps such as descrambling and removal protected field recover initial data, finally by CRC check, detect in packet, whether there is errored bit information, and the data that recover are offered to upper strata process.
For making those skilled in the art better understand the present invention, below in conjunction with specific embodiment, the method that explore frame is added to Bose-Chaudhuri Hocquenghem error correction codes provided by the invention is made to specific description:
Embodiment 1, supposition system adopt Bose-Chaudhuri-Hocquenghem Code pattern 1 to send descending explore frame (PD frame).
When adopting Bose-Chaudhuri-Hocquenghem Code pattern 1, Bose-Chaudhuri-Hocquenghem Code processing module operation parameter is that (508,472) error correcting capability is the BCH shortened code of 4 bits.The check bit that under this pattern, Bose-Chaudhuri-Hocquenghem Code processing module produces is 36 bits.
In the present embodiment, as described below to the related procedure of the transmission processing of PD frame and reception & disposal.Note, succinct for what describe herein, only with regard to inserting the processing that BCH encoding and decoding are relevant, be described.The engineer that in other modulator-demodulator, needed processing should be this area knows, and repeats no more herein.
1.1, BCH pattern is 1 time, determines original signaling information length and data recombination mode that transmitting terminal is processed.
The load patch data length of Pd frame is fixed as 840 bits; the protected field (protected field 11 of 2 section of 10 bit and the protected field 21 that comprise 56 bits; the protected field 13 of the protected field 12 of 2 section of 10 bit and 22,2 section of 8 bit of protected field and protected field 23) and the signaling data (the signaling data section by 4 section of 196 bit forms) of 784 bits.Wherein, the CRC check position of 32 bits and the signaling information being provided by upper strata of 752 bits are provided the signaling data of 784 bits.If system is not inserted Bose-Chaudhuri-Hocquenghem Code and processed, the original signaling information length of the Pd frame that transmitting terminal sends should be 196 * 4-32=752 bit, referring to Fig. 8.
Bose-Chaudhuri-Hocquenghem Code pattern 1 time, for guaranteeing that the data of coding output are 840 bits through length after data recombination, also the signaling data total length that guarantees Bose-Chaudhuri-Hocquenghem Code output is 784 bits, be input to the data length that Bose-Chaudhuri-Hocquenghem Code processes and want few 36 bits of data length of specific output, so that the check bit of generation is filled up this section of vacant position while making to encode.Therefore, during Bose-Chaudhuri-Hocquenghem Code pattern 1, the signaling data length of each section of input Bose-Chaudhuri-Hocquenghem Code processing module is 196+ (196-36)=356 bit, and original signaling information length is 356 * 2-32=680 bit (removing the check digit of 32 bits).
1.2, signaling data is inserted to protected field.
The original signaling information being provided by upper strata, after transmitting terminal increases check digit through CRC, need to insert the protected field of 56 bits.If insert Bose-Chaudhuri-Hocquenghem Code, do not process, signaling data is equally divided into 4 sections, then inserts protected field, specifically referring to Fig. 8.And Bose-Chaudhuri-Hocquenghem Code pattern 1 time, the length of signaling data section 12 and signaling data section 22 will reduce accordingly, and the length of signaling data section 11, signaling data section 12, signaling data section 21 and signaling data section 22 is respectively 196 bits, 160 bits, 196 bits, 160 bits.
1.3, data are carried out to scrambling processing.
Signaling data will carry out scrambling processing after inserting protected field, and the input packet that scrambling is processed is containing the protected field of the original signaling information of 680 bits, the check digit of 32 bits and 56 bits, and its data length is 680+32+56=768 bit.
1.4, the input data of Bose-Chaudhuri-Hocquenghem Code being processed are recombinated.
Bose-Chaudhuri-Hocquenghem Code pattern 1 time, adopting parameter is the BCH shortened code of (508,472), the data block length that is therefore input to Bose-Chaudhuri-Hocquenghem Code processing should be 472 bits.Scrambling is processed the packet of output containing two Bose-Chaudhuri-Hocquenghem Code data blocks and two 8 bit protection fields, and the length of each Bose-Chaudhuri-Hocquenghem Code data block should be 768/2-8=376 bit.In 376 bit fronts, mend 96 bits 0, form the data of 472 bits as the input data of Bose-Chaudhuri-Hocquenghem Code processing, referring to Fig. 4.
1.5, the data of Bose-Chaudhuri-Hocquenghem Code output are recombinated.
Bose-Chaudhuri-Hocquenghem Code pattern 1 time, the data length of Bose-Chaudhuri-Hocquenghem Code output is 508 bits, its data structure is 96 data of bit 0,376 bits and the check bit of 36 bits.Remove the data 0 of front 96 bits, the data of intercepting 412 bits (376+36=412).8 bit protection fields 13 or the protected field 23 on adding in 412 intercepted Bit data back, through scrambling, processed, the data of formation 420 bits.Again the data of 2 section of 420 bit are combined into the load patch data of frame 840 bits as the input data of sign map processing.Referring to Fig. 4.
1.6,, at transmitting terminal, the handling process that data enter after sign map module is identical with the handling process of existing HINOC system, does not repeat them here.
1.7, rewrite protected field value.
At the receiving terminal of system, for the data of DQPSK demodulation output, in the position of its corresponding each protected field, again write corresponding given data, to guarantee that error code does not appear in protected field.Data for DQPSK demodulation output re-start sign map processing, then carry out remodulates, and in the input data of remodulates, corresponding protected field part writes corresponding given data again.Coding mode 1 time, due to the variation of scrambling deal with data length, the value when protected field value in above-mentioned two segment datas does not add Bose-Chaudhuri-Hocquenghem Code to process from system is different.
1.8, BCH decoding input data are recombinated.
Bose-Chaudhuri-Hocquenghem Code pattern 1 time, the input data length of decoder module should be 508 bits.In frame data after DQPSK demodulation, each piece BCH decoded data block length is 412 bits.In 412 Bit data fronts, mend 96 Bit datas 0, form the data of 508 bits as the input data of BCH decoder module.Referring to Fig. 6.
1.9, the data of BCH decoding output are recombinated.
Bose-Chaudhuri-Hocquenghem Code pattern 1 time, the data length of decoding output is 472 bits, its data structure is 96 Bit data 0,376 Bit datas.Remove front 96 bits 0, intercepting 376 Bit datas.On add 376 Bit data back of intercepting, 8 bits, through protected field 13 or protected field 23 after DQPSK demodulation, form the data of 384 bit lengths, as the input data of scramble process.Referring to Fig. 6.
1.10, data are carried out to scramble process.
Corresponding with transmitting terminal scrambling deal with data length, the data length of receiving terminal scramble process is 768 bits.
1.11, remove protected field.
The data of scramble process output need to be removed protected field, extract signaling data.The rule of inserting protected field with transmitting terminal is corresponding, and the length of 4 sections of signaling data sections herein extracting is respectively 196 bits, 160 bits, 196 bits, 160 bits, and its total length is 712 bits.
1.12, CRC check.
Corresponding, the length of CRC check is 712-32=680 bit.
Embodiment 2, supposition system adopt coding mode 2 to send descending explore frame (PD frame).
When adopting Bose-Chaudhuri-Hocquenghem Code pattern 2, coding module operation parameter is that (504,432) error correcting capability is the BCH shortened code of 8 bits.The check bit that under this pattern, Bose-Chaudhuri-Hocquenghem Code module produces is 72 bits.
In the present embodiment, as described below to the related procedure of Pd frame transmission processing and reception & disposal.Similar to Example 1, succinct for what describe herein, also only to inserting the relevant processing of BCH encoding and decoding, be described.
2.1, BCH pattern is 2 times, determines original signaling information length and data recombination mode that transmitting terminal is processed.
Similar to embodiment 1, when Bose-Chaudhuri-Hocquenghem Code pattern 2, for guaranteeing that the data of coding output are 840 bits through length after data recombination, the data length that is input to Bose-Chaudhuri-Hocquenghem Code processing is wanted few 72 bits of data length of specific output, the signaling data length of each section of input coding module is 196+ (196-72)=320 bit, and original signaling information length is 320 * 2-32=608 bit (removing the check digit of 32 bits).
2.2, signaling data is inserted to protected field.
Bose-Chaudhuri-Hocquenghem Code pattern 2 times, the structure of signaling data section and Bose-Chaudhuri-Hocquenghem Code pattern 1 time are consistent, the length of signaling data section 12 and signaling data section 22 will reduce accordingly, and the length of signaling data section 11, signaling data section 12, signaling data section 21 and signaling data section 22 is respectively 196 bits, 124 bits, 196 bits, 124 bits.
2.3, data are carried out to scrambling processing.
Signaling data will carry out scrambler after inserting protected field, and the packet that input scrambling is processed is containing the protected field of the original signaling information of 608 bits, the check digit of 32 bits and 56 bits, and its data length is 608+32+56=696 bit.
2.4, the input data of Bose-Chaudhuri-Hocquenghem Code being processed are recombinated.
Bose-Chaudhuri-Hocquenghem Code pattern 2 times, adopting parameter is the BCH shortened code of (504,432), the data length that is input to Bose-Chaudhuri-Hocquenghem Code processing module should be 432 bits.Scrambling is processed the packet of output containing two sections of Bose-Chaudhuri-Hocquenghem Code data blocks and two section of 8 bit protection field, and the length of each Bose-Chaudhuri-Hocquenghem Code data block should be 696/2-8=340 bit.In 340 bit fronts, mend 92 bits 0, form the data of 432 bits as the input data of Bose-Chaudhuri-Hocquenghem Code module.Referring to Fig. 5.
2.5, the data of Bose-Chaudhuri-Hocquenghem Code output are recombinated.
Bose-Chaudhuri-Hocquenghem Code pattern 2 times, the data length of Bose-Chaudhuri-Hocquenghem Code output is 504 bits, its data structure is 92 data of bit 0,340 bits and the check bit of 72 bits.Remove the data 0 of front 92 bits, the data of intercepting 412 bits (340+72=412).8 bit protection fields 13 or protected field 23 on adding in 412 intercepted Bit data back after scrambling processing, the data of formation 420 bits.Again the data of 2 section of 420 bit are combined into the load patch data of frame 840 bits as the input data of sign map processing.Referring to Fig. 5.
2.6,, at transmitting terminal, the handling process that data enter after sign map module is identical with the handling process of existing HINOC system, does not repeat them here.
2.7, rewrite protected field value.
Embodiment 1 1.7 in the data of DQPSK demodulation output and the protected field value of remodulates output data mentioned to rewrite.Due to the variation of scrambling deal with data length, the value of the protected field in above-mentioned two segment datas under Bose-Chaudhuri-Hocquenghem Code pattern 2 is different.
2.8, BCH decoding input data are recombinated.
Bose-Chaudhuri-Hocquenghem Code pattern 2 times, the input data length of BCH decoding process module should be 504 bits.In frame data after DQPSK demodulation, each piece BCH decoded data block length is 412 bits.In 412 Bit data fronts, mend 92 Bit datas 0, form the data of 504 bits as the input data of BCH decoder module.Referring to Fig. 7.
2.9, the data of BCH decoding output are recombinated.
Bose-Chaudhuri-Hocquenghem Code pattern 2 times, the data length of decoding output is 432 bits, its data structure is 92 Bit data 0,340 Bit datas.Remove front 92 bits 0, intercepting 340 Bit datas.On add 340 Bit data back of intercepting, 8 bits, through protected field 13 or protected field 23 after DQPSK demodulation, form the data of 348 bit lengths, as the input data of scramble process.Referring to Fig. 7.
2.10, data are carried out to scramble process.
Corresponding with transmitting terminal scrambling deal with data length, the data length of receiving terminal scramble process is 696 bits.
2.11, remove protected field.
The data of scramble process output need to be removed protected field, extract signaling data.The rule of inserting protected field with transmitting terminal is corresponding, and the length of 4 sections of signaling data sections herein extracting is respectively 196 bits, 124 bits, 196 bits, 124 bits, and its total length is 640 bits.
2.12, CRC check.
Accordingly, the length of CRC check is 640-32=608 bit.
Embodiment 3, supposition adopt Bose-Chaudhuri-Hocquenghem Code pattern 0 to send Pd frame, and the handling process under this pattern is the handling process of existing HINOC system, at this, just repeats no more.
Adopt the method that explore frame is added to Bose-Chaudhuri Hocquenghem error correction codes provided by the invention, exist under the Gaussian white noise channel of 20.03MHZ single-frequency, adopt 3 kinds of Bose-Chaudhuri-Hocquenghem Code patterns to carry out emulation to system.Those skilled in the art will appreciate that signal power is lower with the ratio (C/I) of interference power, the antijamming capability of representative system is stronger.From simulation result, under above-mentioned channel condition, when frame error rate is the 1.00E-04 order of magnitude, the Pd frame that has added Bose-Chaudhuri Hocquenghem error correction codes is compared with the Pd frame that does not add Bose-Chaudhuri Hocquenghem error correction codes, and the former greatly improves performance.Ratio (C/I) value of the signal power of Bose-Chaudhuri-Hocquenghem Code pattern 1 and interference power is than the about 4dB of C/I value decline of Bose-Chaudhuri-Hocquenghem Code pattern 0, the C/I value of the Bose-Chaudhuri-Hocquenghem Code pattern 2 about 16dB that will decline.Hence one can see that, and the anti-single-frequency interference performance of system is greatly strengthened, same, and when existing multipath to disturb, the anti-multipath interference performance of system also can significantly promote.Scheme provided by the present invention has solved the problem that system cannot normally be moved when existing strong multipath to disturb and single-frequency disturbs.Meanwhile, the present invention is directed to the structure and characteristics of explore frame, minimal modification original system, makes system simple.
In conjunction with specific embodiments the present invention is had been described in detail above; but the present invention is not restricted to above-described embodiment; do not departing under the spiritual scope of the claims in the present invention; any modification that those skilled in the art does, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in.
Claims (4)
1. the explore frame of HINOC system is added to a method for Bose-Chaudhuri Hocquenghem error correction codes, it is characterized in that:
Between the scrambling processing of system transmitting terminal and sign map are processed, inserting Bose-Chaudhuri-Hocquenghem Code processes; Between the DQPSK of system receiving terminal demodulation process and scramble process, inserting BCH decoding processes;
The load patch data of one frame explore frame are divided into two sections and carry out Bose-Chaudhuri-Hocquenghem Code, form two Bose-Chaudhuri-Hocquenghem Code data blocks; Described load patch data are the signaling data that is inserted with protected field; Bose-Chaudhuri-Hocquenghem Code data block 1 consists of protected field 11, signaling data section 11, protected field 12 and signaling data section 12; Bose-Chaudhuri-Hocquenghem Code data block 2 consists of protected field 21, signaling data section 21, protected field 22 and signaling data section 22;
To explore frame, adopt three kinds of Bose-Chaudhuri-Hocquenghem Code patterns to process; Pattern 0 does not adopt BCH encoding and decoding; It is that (508,472), error correcting capability are that the BCH shortened code of 4 bits is carried out encoding and decoding that pattern 1 adopts parameter; It is that (504,432), error correcting capability are that the BCH shortened code of 8 bits is carried out encoding and decoding that pattern 2 adopts parameters;
The input data that described Bose-Chaudhuri-Hocquenghem Code is processed are carried out the data recombination of following mode;
During employing pattern 0, data do not participate in BCH encoding and decoding, do not process;
During employing pattern 1, adopting parameter is the BCH shortened code of (508,472), and the length of input data is 472 bits; Scrambling is processed to 376 Bit datas of output and added 96 bits 0, form the data block of 472 bits as the input data of Bose-Chaudhuri-Hocquenghem Code processing under this pattern;
During employing pattern 2, adopting parameter is the BCH shortened code of (504,432), and the length of input data is 432 bits; Scrambling is processed to 340 Bit datas of output and added 92 bits 0, form the data block of 432 bits as the input data of Bose-Chaudhuri-Hocquenghem Code processing under this pattern;
The output data that described Bose-Chaudhuri-Hocquenghem Code is processed are carried out the data recombination of following mode;
During employing pattern 0, data do not participate in Bose-Chaudhuri-Hocquenghem Code, do not process;
During employing pattern 1, adopting parameter is the BCH shortened code of (508,472), and the data length of coding output is 508 bits; Remove 96 bits 0 of adding before coding, intercepting 412 Bit datas, and 8 bit protection fields after processing through scrambling, the data of formation 420 bits on add the back of 412 Bit datas; Again the data of two section of 420 bit are combined into the data block of 840 bits, the input data of processing as sign map;
During employing pattern 2, adopting parameter is the BCH code of (504,432), and the data length of coding output is 504 bits; Remove 92 bits 0 of adding before coding, intercepting 412 Bit datas, and 8 bit protection fields after processing through scrambling, the data of formation 420 bits on add the back of 412 Bit datas; Again the data of two section of 420 bit are combined into the data block of 840 bits, the input data of processing as sign map.
2. the method for claim 1, is characterized in that, HINOC system receiving terminal takes one of following three kinds of modes to know or detect the Bose-Chaudhuri-Hocquenghem Code pattern that transmitting terminal adopts;
Mode one, receiving terminal and transmitting terminal arrange to adopt certain Bose-Chaudhuri-Hocquenghem Code pattern in advance;
Mode two, receiving terminal circulation adopt three kinds of corresponding BCH decoding schemas to decode to received signal, and carry out follow-up descrambling, CRC check processing, according to CRC check result, determine correct Bose-Chaudhuri-Hocquenghem Code pattern;
Mode three, by correlation technique, detect the Bose-Chaudhuri-Hocquenghem Code pattern that transmitting terminal adopts; be about to protected field sequence after scrambling is processed and receive protected field in signal and partly carry out related operation, getting the coding mode that can access maximum correlation peak value is currently used correct Bose-Chaudhuri-Hocquenghem Code pattern.
3. the method for claim 1, is characterized in that: at receiving terminal, system partly writes known data again to corresponding protected field in the data of corresponding protected field part and input remodulates in DQPSK demodulation output data.
4. the method for claim 1, is characterized in that, the input data that described BCH decoding is processed are carried out the data recombination of following mode;
During employing pattern 0, data do not participate in BCH decoding, do not process;
During employing pattern 1, the input data length that BCH decoding is processed is 508 bits, and the data length of DQPSK demodulation output is 840 bits, and the length of each section of decoded data is 412 bits; 412 Bit datas are added to 96 bits 0, form the data of 508 bits as the input data of BCH decoding processing under this pattern;
During employing pattern 2, the input data length that BCH decoding is processed is 504 bits, and the data length of DQPSK demodulation output is 840 bits, and the length of each section of decoded data is 412 bits; 412 Bit datas are added to 92 bits 0, form the data of 504 bits as the input data of BCH decoding processing under this pattern;
The output data that described BCH decoding is processed are carried out the data recombination of following mode;
During employing pattern 0, data do not participate in BCH decoding, do not process;
During employing pattern 1, the output data length that BCH decoding is processed is 472 bits; Remove 96 bits 0 of mending before decoding, intercepting 376 Bit datas, and 8 bit protection fields pass through DQPSK demodulation on add the back of 376 Bit datas after; Again two sections of data that increased protected field are combined into data available, as the input data of scramble process;
During employing pattern 2, the output data length that BCH decoding is processed is 432 bits; Remove 92 bits 0 of mending before decoding, intercepting 340 Bit datas, and 8 bit protection fields pass through DQPSK demodulation on add the back of 340 Bit datas after; Again two sections of data that increased protected field are combined into data available, as the input data of scramble process.
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