CN1640036A - A Method of Generating Orthogonal Spread Spectrum Code Groups with Intergroup Zero Correlation Window Characteristic - Google Patents
A Method of Generating Orthogonal Spread Spectrum Code Groups with Intergroup Zero Correlation Window Characteristic Download PDFInfo
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- CN1640036A CN1640036A CN03805477.9A CN03805477A CN1640036A CN 1640036 A CN1640036 A CN 1640036A CN 03805477 A CN03805477 A CN 03805477A CN 1640036 A CN1640036 A CN 1640036A
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- spread spectrum
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- 238000001228 spectrum Methods 0.000 title claims abstract 34
- 238000000034 method Methods 0.000 title claims abstract 17
- 238000001514 detection method Methods 0.000 claims abstract 5
- 238000005314 correlation function Methods 0.000 claims abstract 3
- 239000011159 matrix material Substances 0.000 claims 12
- 230000000737 periodic effect Effects 0.000 claims 5
- 230000000295 complement effect Effects 0.000 claims 2
- 239000004005 microsphere Substances 0.000 claims 2
- 230000000694 effects Effects 0.000 claims 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/0055—ZCZ [zero correlation zone]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/004—Orthogonal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/10—Code generation
- H04J13/14—Generation of codes with a zero correlation zone
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The invention provides a method for orthogonal spread spectrum code group with intergroup zero correlation window characteristic, which comprises generating or selecting a group of orthogonal spread spectrum codes as an orthogonal spread spectrum code group spreading base; generating an orthogonal spreading code group spreading core with an aperiodic zero correlation window between groups [ -T, T ] by using the orthogonal spreading code group spreading base, wherein: t is the width T of the unilateral aperiodic zero correlation window, and T is more than or equal to 0; and expanding the core of the orthogonal spread spectrum code group to generate an orthogonal spread spectrum code group with the inter-group zero correlation window characteristic. The formed correlation characteristics between groups of the spread spectrum multi-address codes have a 'zero correlation window', namely, the cross-correlation function between the address codes of each group in the zero correlation window has no peak, so that the Multiple Access Interference (MAI) between the groups is eliminated, and even if the Multiple Access Interference (MAI) exists between the address codes in the same group, the optimal receiving can be achieved by utilizing a joint detection technology.
Description
PCT国内申请，说明书已公开。PCT domestic application, specification has been published.
Claims (13)
- Claims to follow1. A method for generating orthogonal spreading code groups having an inter-group zero correlation window characteristic, comprising the steps of:generating a group of orthogonal spread spectrum codes as an orthogonal spread spectrum code group spreading base;generating the spreading base of the orthogonal spreading code group to have [ -7; t is]The spreading core of the orthogonal spreading code group of the aperiodic zero correlation window, where: 71The unilateral non-periodic zero correlation window width gamma is not less than theta, and the spread spectrum code group.
- 2. The method of claim 1, wherein a zero guard interval or a time slot can be inserted into the orthogonal spreading code group spreading base.
- 3. The method of claim 1, wherein a zero guard interval or a time slot can be inserted into the orthogonal spreading code group spreading core.
- 4. The method of claim 1, wherein zero guard intervals or time slots can be inserted into the orthogonal spreading address codes.
- 5. The method of claim 1, wherein selecting a set of orthogonal spreading codes as the spreading bases of orthogonal spreading code groups comprises selecting any set of orthogonal spreading codes as the spreading bases of orthogonal spreading code groups.
- 6. The method of claim 5, wherein the arbitrary set of orthogonal spreading codes comprises: wa l sh code group, orthogonal complementary code group with zero correlation window characteristic.
- 7. The method of claim 5, wherein generating the set of orthogonal spreading codes comprises: if the given original sequence group is not orthogonal, a certain number of zero guard intervals or time slots can be inserted into the given original sequence group to form a new orthogonal sequence group which is used as an orthogonal spreading code group spreading base; if a given original sequence set is orthogonal, the given original sequence set can be used as a spreading base of a forward spreading code set.
- 8. The method of claim 1, wherein the generating the orthogonal frequency code set spreading base has [ -7; t ] orthogonal spread spectrum code group spreading core of non-periodic zero correlation window comprises: if the spreading base of the orthogonal spreading code group is greater than or equal to [ -7; is andthe gamma is more than or equal to 0, and the orthogonal spread spectrum code group of the non-periodic zero correlation window, the spreading base of the orthogonal spread spectrum code group is used as the spreading kernel of the orthogonal spread spectrum code group;if the spreading base of the orthogonal spreading code group is less than [ -7; τ ], and r is greater than or equal to o, the spreading base of the orthogonal spreading code group can be formed by inserting a certain number of zero guard intervals or time slots, thereby forming a code group with a non-periodic zero correlation window greater than or equal to [ -7; 7 Ί, and J is greater than or equal to 0, then the orthogonal spread code group can be used as the spreading core of the orthogonal spread code group.
- 9. The method of claim 8 wherein each code length of said orthogonal spreading code group spreading core is N, and there are a total of M such code words:{ ≦ ί ≦ m, whereinC;= ( ,¾,···, ciN) Represents the ith code; the code matrix is: c MxN, where each row of the code matrix represents a spreading code;
the unilateral aperiodic zero correlation window width r is defined as follows:Tccw= max^ | ¾ (τ) = 0, ,1<i, j≤M,i≠ j,0≤ \τ\≤ w\wherein the microspheres W represent the aperiodic cross-correlation function between the ζ -th and the jth' codes, r representing the time offset: t isCORepresents the aperiodic cross-correlation zero window width;the aperiodic zero correlation window width of the code group is defined as: t = TCCW。 - 10. The method of claim 1, wherein the spreading the kernel of the set of orthogonal spreading codes to generate the set of orthogonal frequency codes with the inter-set zero correlation window characteristic comprises: firstly, selecting an expansion matrix, wherein the expansion matrixIs an orthogonal matrix, and can optimize the extended generator by selecting a better extended matrixThen, the new orthogonal spreading code group with the inter-group zero correlation window characteristic is generated by the following spreading method:
wherein "" represents the Kronecker product;each row of the extension matrix representation is used as a new code word, thus the code word has a total of MK codes, the code length is that the code words are divided into-groups in sequence, thus the total code length can be divided intoAnd M groups:a first group:Cl®gl, c1®g2,---,c1®gA.;second group: tgig c2®g2,-",c2®gAThe M group: tilegl, c ®g2,---,cM®gA.;M groups of orthogonal spread codes generated after spreading have intergroup zero correlation windows which are more than or equal to [ the number of F, F ];inserting a certain number of zero guard intervals or time slots into the orthogonal spread spectrum code group with the characteristics of the zero correlation windows among the beams to generate a new orthogonal spread spectrum code group with the characteristics more than or equal to that of the orthogonal spread spectrum code group-inter-group zero correlation window of [ -Jr, r ]. - 11. The method of claim 10, wherein if the correlation between the codewords in the generated orthogonal spreading code group with the interclass zero correlation window is not ideal, joint correlation is usedThe effect of the induced interference; because only the code words between the same code group have interference, the code words in the group can be jointly detected, and the optimal complexity of joint detection is O), which is element modulation.
- 12. The method of claim 1, comprising the steps of 1, selecting a set of orthogonal spreading codes as spreading bases of orthogonal spreading code sets; wherein: selecting any one of the orthogonal spread spectrum codes as an orthogonal spread spectrum code group spreading base; the arbitrary set of orthogonal spreading codes may include: walsh code groups, orthogonal complementary code groups with zero correlation window characteristics, and the like; if the given original sequence group is not orthogonal, a certain number of zero guard intervals or time slots can be inserted into the given original sequence group to form a new orthogonal sequence group, and the new orthogonal sequence group is used as an orthogonal spreading code group spreading base; if the given original sequence group is orthogonal, the given original sequence group can be used as an orthogonal spread spectrum code group spreading base; step 2, generating an orthogonal spread spectrum code group spreading base with [ -7; the orthogonal spread spectrum code group of the aperiodic zero correlation window of the gamma; if the spreading base of the orthogonal spreading code group is greater than or equal to [ -7; t ], and 7 is more than or equal to 0, then the orthogonal spread spectrum code group spreading base is used as the spreading core of the orthogonal spread spectrum code group; if the spreading base of the orthogonal spreading code group is less than [ -; t3, and 7 ≧ 0, by inserting a certain number of zero guard intervals or time slots into the orthogonal spreading code group spreading base, thereby forming a spread code group with a non-periodic zero correlation window greater than or equal to [ -7; t ], and 7 is more than or equal to the orthogonal spread spectrum code group of the aperiodic zero correlation window of 0, then the orthogonal spread spectrum code group can be used as the spreading kernel of the orthogonal spread spectrum code group; assuming that the code length of each code of the orthogonal spread spectrum code group spreading kernel is N, there are M such code words:represents a first code;each row of the code matrix represents a spreading code word;
the unilateral aperiodic zero correlation window width Γ is defined as follows:
wherein the microspheres (r) represent aperiodic cross-correlation functions between the first code and the _/code, r represents time offset, and ^ represents aperiodic cross-correlation zero-window width; the aperiodic zero correlation window width of the code group is defined as: t = TCCW；Step (ii) of3Expanding the core of the orthogonal spread spectrum code group to generate an orthogonal spread spectrum code group with the inter-group zero correlation window characteristic; wherein: first, a spreading matrix is generated or selected
The spreading matrix is an orthogonal matrix, and the correlation characteristic between the codes in the orthogonal spreading code group with the inter-group zero correlation window characteristic generated by spreading can be optimized by selecting a better spreading matrix;then, a new orthogonal spreading code group with the inter-group zero correlation window characteristic is generated by the following spreading method:
wherein "", indicates Kronecker product;each row of the extension matrix representation is used as a new code word, thus MK codes with the code length of NZ are shared, and the codes are sequentially divided into-groups, so that the codes can be totally divided intoAnd M groups:a first group: g gl3Cl®g2,---,l®gK;Second group: c. C2®gl, c2Og25---,c2®gitAnd the third component: ^ a ^ bδι, cM®gz,--;cMgK;The M groups of orthogonal spread spectrum code groups generated after spreading have an intergroup zero correlation window which is greater than or equal to phi, gamma;inserting the orthogonal spread spectrum code group with the intergroup zero correlation window characteristic into a certain number of zero guard intervals or time slots, thereby generating a new orthogonal spread spectrum code group with an intergroup zero correlation window which is greater than or equal to [ -LT, LT ];if the correlation characteristics among the code words in the generated groups with the intergroup zero correlation window orthogonal spread spectrum code groups are not ideal, joint detection can be adopted to eliminate the influence of the interference from the code words in the groups due to the fact that the correlation characteristics among the code words in the groups are not ideal; because only the code words between the same code group have 4, I can carry out joint detection on the code words in the group, and the optimal complexity of the joint detection is omicron iota, wherein 2 is element modulation. - 13. A method according to claim 2, 3 or 4, characterised in that it consists in pairing saidEach spreading address code of the orthogonal spreading code group is inserted into a zero guard interval or a time slot to increase the size of an intergroup zero correlation window between each group of spreading address codes generated after spreading.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2003/000117 WO2004068762A1 (en) | 2003-01-31 | 2003-01-31 | A method to form orthogonal spread spectrum code groups having inter-group zero correlation window characteristic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1640036A true CN1640036A (en) | 2005-07-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN03805477.9A Pending CN1640036A (en) | 2003-01-31 | 2003-01-31 | A Method of Generating Orthogonal Spread Spectrum Code Groups with Intergroup Zero Correlation Window Characteristic |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN1640036A (en) |
| AU (1) | AU2003211844A1 (en) |
| WO (1) | WO2004068762A1 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002536870A (en) * | 1999-01-29 | 2002-10-29 | ピンツィ ファン | Interference-free adaptive spread spectrum communication system using binary code sequence with uncorrelated region |
| CA2399830A1 (en) * | 2000-02-17 | 2001-08-23 | Linkair Communications, Inc. | A method for spread spectrum multiple access coding with zero correlation window |
-
2003
- 2003-01-31 AU AU2003211844A patent/AU2003211844A1/en not_active Abandoned
- 2003-01-31 CN CN03805477.9A patent/CN1640036A/en active Pending
- 2003-01-31 WO PCT/CN2003/000117 patent/WO2004068762A1/en not_active Application Discontinuation
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| Publication number | Publication date |
|---|---|
| AU2003211844A1 (en) | 2004-08-23 |
| WO2004068762A1 (en) | 2004-08-12 |
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