1. A recording device for selecting a preferred write strategy for an optical disc from a plurality of write strategies, the optical disc containing a characteristic value indicating manufacturer information or material information of the optical disc, the recording device comprising:
a readingwriting circuit coupled to read the characteristic value of the optical disc; and
a controller coupled to the readingwriting circuit for selecting a first set of write strategies from a plurality of sets of write strategies according to the characteristic value, and determining the preferred write strategy by evaluating actual writing quality of the write strategies included in the first set of write strategies;
wherein the plurality of write strategies are divided into the plurality of sets of write strategies according to a plurality of characteristic values corresponding to a plurality of optical discs.
2. The recording device of claim 1, wherein the evaluating actual writing quality is performed by writing a test pattern onto the optical disc, reading the test pattern written on the optical disc, and obtaining bit error rate information or jitter information of the written test pattern.
3. The recording device of claim 1, wherein if the actual writing quality does not meet a predetermined criterion, the controller further selecting a second set of write strategies according to the characteristic value, and determining the preferred write strategy by evaluating actual writing quality of the write strategies included in the second set of write strategies.
4. The recording device of claim 1, further comprising a non-volatile memory coupled to the controller for storing the first set of write strategies.
5. The recording device of claim 1, wherein the non-volatile memory further stores the relationship between the preferred write strategy and the characteristic value, thereby the recording device can use the preferred write strategy for writing data onto another optical disc having a same characteristic value without the need of selecting the first set of write strategies and evaluating actual writing quality of the write strategies included in the first set of write strategies.
6. A recording device for selecting a preferred write strategy for an optical disc, the optical disc containing a characteristic value indicating manufacturer information or material information of the optical disc; the recording device comprising:
a non-volatile memory for storing a plurality of write strategies, wherein the plurality of write strategies are divided into a plurality of write strategy sets according to a plurality of characteristic values corresponding to a plurality of optical discs;
a readingwriting circuit for reading the characteristic value of the optical disc; and
a controller coupled to the readingwriting circuit for selecting a plurality of candidate write strategies included in a first write strategy set of the plurality of write strategy sets according to the characteristic value, driving the readingwriting circuit to write a test pattern onto the optical disc according to each of the plurality of candidate write strategies, evaluating writing quality of the test patterns, and selecting the preferred write strategy according to the writing quality of the test patterns.
7. A method for selecting a preferred write strategy for an optical disc from a plurality of write strategies, the optical disc containing a characteristic value; the method comprising:
(a) reading the characteristic value from the optical disc;
(b) selecting a first write strategy from the write strategies to be an active test write strategy according to the characteristic value of the optical disc;
(c) writing a test pattern onto the optical disc according to the active test write strategy;
(d) reading the written test pattern from the optical disc, checking if the written test pattern satisfies a corresponding criterion, and utilizing the active test write strategy to be the preferred write strategy if the written test pattern satisfies the corresponding criterion; and
(e) before performing step (b), dividing the write strategies into a plurality of write strategy sets according to a plurality of characteristic values corresponding to a plurality of optical discs.
8. The method of claim 7, wherein step (b) comprises selecting a first write strategy set from the write strategy sets to be an active test write strategy set according to the characteristic value of the optical disc, and then selecting the first write strategy from the active test write strategy set to be the active test write strategy.
9. The method of claim 8, wherein if the written test pattern in step (d) does not satisfy the corresponding criterion, step (b) further comprises selecting a second write strategy from the active test write strategy set to be the active test write strategy according to the characteristic value of the optical disc.
10. The method of claim 8, wherein if a test pattern written according to each write strategy of the active test write strategy set does not satisfy a corresponding criterion, step (b) further comprises selecting a second write strategy set from the write strategy sets to be the active test write strategy set according to the characteristic value, and selecting a third write strategy from the active test write strategy set to be the active test write strategy.
11. The method of claim 7, wherein the corresponding criterion corresponds to a bit error rate (BER) being less than a predetermined value or a jitter being less than a predetermined degree.
12. The method of claim 7, further comprising:
(e) storing the relationship between the preferred write strategy and the characteristic value of the optical disc into a storage unit; and
(f) using the preferred write strategy for writing data onto another optical disc having a same characteristic value without the need of performing steps (b), (c), and (d).
13. The method of claim 7, wherein the characteristic value records manufacturer information of the optical disc or material information of the optical disc.
14. A recording device for selecting a preferred write strategy for an optical disc from a plurality of write strategies, the optical disc containing at a characteristic value; the recording device comprising:
a readingwriting circuit for reading the characteristic value from the optical disc; and
a controller electrically connected to the readingwriting circuit for selecting a first write strategy from the write strategies, which are divided into a plurality of write strategy sets according to a plurality of characteristic values corresponding to a plurality of optical discs, to be an active test write strategy according to the characteristic value of the optical disc, driving the readingwriting circuit to write a test pattern onto the optical disc according to the active test write strategy, and driving the readingwriting circuit to read the written test pattern from the optical disc, wherein the controller checks if the written test pattern satisfies a corresponding criterion, and utilizes the active test write strategy to be the preferred write strategy if the written test pattern satisfies the corresponding criterion.
15. The recording device of claim 14, wherein the controller selects a first write strategy set from the write strategy sets to be an active test write strategy set according to the characteristic value of the optical disc, and then selects the first write strategy from the active test write strategy set to be the active test write strategy.
16. The recording device of claim 15, wherein if the written test pattern does not satisfy the corresponding criterion, the controller further selects a second write strategy from the active test write strategy set to be the active test write strategy according to the characteristic value of the optical disc.
17. The recording device of claim 15, wherein if a test pattern written according to each write strategy of the active test write strategy set does not satisfy a corresponding criterion, the controller further selects a second write strategy set from the write strategy sets to be the active test write strategy set according to the characteristic value, and selects a third write strategy from the active test write strategy set to be the active test write strategy.
18. The recording device of claim 14, wherein the criterion corresponds to a bit error rate (BER) being less than a predetermined value or jitter being less than a predetermined degree.
19. The recording device of claim 14, further comprising a storage unit electrically connected to the controller for storing the relationship between the preferred write strategy and the characteristic value of the optical disc, wherein the controller drives the readingwriting circuit to write data onto another optical disc having a same characteristic value according to the preferred write strategy without selecting a write strategy from the write strategies to be an active test write strategy according to the characteristic value of the another optical disc, driving the readingwriting circuit to write a test pattern onto the another optical disc according to the active test write strategy, driving the readingwriting circuit to read the written test pattern from the another optical disc, and checking if the written test pattern satisfies a corresponding criterion.
20. The recording device of claim 19 being an optical disc drive, wherein the readingwriting circuit is a pick-up head, and the storage unit is a non-volatile memory.
21. The recording device of claim 14, wherein the characteristic value records manufacturer information of the optical disc or material information of the optical disc.
22. A method for selecting a preferred write strategy for an optical disc from a plurality of write strategies, the optical disc containing a characteristic value; the method comprising:
(a) reading the characteristic value from the optical disc;
(b) selecting a first write strategy included in a first write strategy set from the write strategies, which are divided into a plurality of write strategy sets according to a plurality of characteristic values corresponding to a plurality of optical discs, to be an active test write strategy according to the characteristic value of the optical disc;
(c) writing a test pattern onto the optical disc according to the active test write strategy;
(d) reading the written test pattern from the optical disc, checking if the written test pattern satisfies a corresponding criterion, and utilizing the active test write strategy to be the preferred write strategy if the written test pattern satisfies the corresponding criterion; and
(e) storing the relationship between the preferred write strategy and the characteristic value of the optical disc into a storage unit, thereby using the preferred write strategy for writing data onto another optical disc having a same characteristic value without the need of selecting the first write strategy and evaluating the first write strategy.
23. A recording device for selecting a preferred write strategy for an optical disc from a plurality of write strategies, the optical disc containing a characteristic value; the recording device comprising:
a readingwriting circuit for reading the characteristic value from the optical disc;
a controller electrically connected to the readingwriting circuit for selecting a first write strategy included in a first write strategy set of a plurality of write strategy set obtained by dividing the write strategies according to a plurality of characteristic values corresponding to a plurality of optical discs, to be an active test write strategy according to the characteristic value of the optical disc, driving the readingwriting circuit to write a test pattern onto the optical disc according to the active test write strategy, and driving the readingwriting circuit to read the written test pattern from the optical disc, wherein the controller checks if the written test pattern satisfies a corresponding criterion, and utilizes the active test write strategy to be the preferred write strategy if the written test pattern satisfies the corresponding criterion; and
a storage unit electrically connected to the controller for storing the relationship between the preferred write strategy and the characteristic value of the optical disc, thereby the recording device uses the preferred write strategy for writing data onto another optical disc having a same characteristic value without the need of selecting the first write strategy and evaluating the first write strategy.
24. A method for selecting a preferred write strategy for an optical disc from a plurality of write strategies, the optical disc containing a characteristic value; the method comprising:
(a) reading the characteristic value from the optical disc;
(b) selecting a first set of write strategies from a plurality of sets of write strategies to be an active test write strategy set according to the characteristic value,
(c) writing a plurality of test patterns onto the optical disc according to the write strategies of the active test write strategy set; and
(d) reading the written test patterns from the optical disc, selecting a substantially optimal written test pattern which satisfies a corresponding criterion from the written test patterns, and utilizing a write strategy corresponding to the substantially optimal written test pattern to be the preferred write strategy;
wherein the plurality of write strategies are divided into the plurality of sets of write strategies according to a plurality of characteristic values corresponding to a plurality of optical discs.
25. The method of claim 24, wherein if each test pattern written according to each write strategy of the active test write strategy set does not satisfy a corresponding criterion, step (b) further comprises selecting a second set of write strategies from the sets of write strategies to be the active test write strategy set according to the characteristic value.
26. The method of claim 24, wherein the corresponding criterion corresponds to a bit error rate (BER) being less than a predetermined value or a jitter being less than a predetermined degree.
27. The method of claim 24, farther comprising:
(e) storing the relationship between the preferred write strategy and the characteristic value of the optical disc into a storage unit; and
(f) using the preferred write strategy for writing data onto another optical disc having a same characteristic value without the need of performing steps (b), (c), and (d).
28. The method of claim 24, wherein the characteristic value records manufacturer information of the optical disc or material information of the optical disc.
29. A recording device for selecting a preferred write strategy for an optical disc from a plurality of write strategies, the optical disc containing a characteristic value; the recording device comprising:
a readingwriting circuit for reading the characteristic value from the optical disc; and
a controller electrically connected to the readingwriting circuit for selecting a first set of write strategies from a plurality of sets of write strategies to be an active test write strategy set according to the characteristic value, driving the readingwriting circuit to write a plurality of test patterns onto the optical disc according to the write strategies of the active test write strategy set, and driving the readingwriting circuit to read the written test patterns from the optical disc, wherein the controller selects a substantially optimal written test pattern which satisfies a corresponding criterion from the written test patterns, and utilizes a write strategy corresponding to the substantially optimal written test pattern to be the preferred write strategy;
wherein the plurality of write strategies are divided into the plurality of sets of write strategies according to a plurality of characteristic values corresponding to a plurality of optical discs.
30. The recording device of claim 29, wherein if each test pattern written according to each write strategy of the active test write strategy set does not satisfy a corresponding criterion, the controller further selects a second set of write strategies from the sets of write strategies to be the active test write strategy set according to the characteristic value.
31. The recording device of claim 29, wherein the criterion corresponds to a bit error rate (BER) being less than a predetermined value or jitter being less than a predetermined degree.
32. The recording device of claim 29, further comprising a storage unit electrically connected to the controller for storing the relationship between the preferred write strategy and the characteristic value of the optical disc, wherein the controller drives the readingwriting circuit to write data onto another optical disc having a same characteristic value according to the preferred write strategy without selecting a set of write strategies from the write strategies to be an active test write strategy set according to the characteristic value of the another optical disc, driving the readingwriting circuit to write a plurality of test patterns onto the another optical disc according to the write strategies of the active test write strategy, driving the readingwriting circuit to read the written test patterns from the another optical disc, and selecting a substantially optimal written test pattern which satisfies a corresponding criterion from the written test patterns.
33. The recording device of claim 32 being an optical disc drive, wherein the readingwriting circuit is a pick-up head, and the storage unit is a non-volatile memory.
34. The recording device of claim 29, wherein the characteristic value records manufacturer information of the optical disc or material information of the optical disc.
35. A method for selecting a preferred write strategy for an optical disc from a plurality of write strategies, the optical disc containing a characteristic value; the method comprising:
(a) reading the characteristic value from the optical disc;
(b) selecting a first set of write strategies from a plurality of sets of write strategies to be an active test write strategy set according to the characteristic value, wherein the plurality of write strategies are divided into the plurality of sets of write strategies according to a plurality of characteristic values corresponding to a plurality of optical discs;
(c) writing a plurality of test patterns onto the optical disc according to write strategies of the active test write strategy set;
(d) reading the written test patterns from the optical disc, selecting a substantially optimal written test pattern which satisfies a corresponding criterion from the written test patterns, and utilizing a write strategy corresponding to a substantially optimal written test pattern to be the preferred write strategy; and
(e) storing the relationship between the preferred write strategy and the characteristic value of the optical disc into a storage unit, thereby using the preferred write strategy for writing data onto another optical disc having a same characteristic value without the need of selecting the first set of write strategies and evaluating the first set of write strategies.
36. A recording device for selecting a preferred write strategy for an optical disc from a plurality of write strategies, the optical disc containing a characteristic value; the recording device comprising:
a readingwriting circuit for reading the characteristic value from the optical disc; and
a controller electrically connected to the readingwriting circuit for selecting a first set of write strategies from a plurality of sets of write strategies according to the characteristic value, driving the readingwriting circuit to write a plurality of test patterns onto the optical disc according to the write strategies of the active test write strategy set, and driving the readingwriting circuit to read the written test patterns from the optical disc, wherein the controller selects a substantially optimal written test pattern which satisfies a corresponding criterion from the written test patterns, and utilizes a write strategy corresponding to the substantially optimal written test pattern to be the preferred write strategy, wherein the plurality of write strategies are divided into the plurality of sets of write strategies according to a plurality of characteristic values corresponding to a plurality of optical discs; and
a storage unit electrically connected to the controller for storing the relationship between the preferred write strategy and the characteristic value of the optical disc, thereby the recording device uses the preferred write strategy for writing data onto another optical disc having a same characteristic value without the need of selecting the first set of write strategies and evaluating the first set of write strategies.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for transmitting a code sequence from a transmitting party to a receiving party in a wireless communication system, the method comprising:
acquiring a code sequence having a second length by a cyclic extension of a code sequence having a first length;
performing a circular shift to the code sequence having the second length; and
transmitting the circular shifted code sequence having the second length to the receiving party,
wherein the first length is a largest prime number smaller than the second length, and
wherein the cyclic extension of the code sequence having the first length is performed such that a part of the code sequence having the first length, having a length corresponding to a difference between the first length and the second length, is added to either a start or an end of the code sequence having the first length, and
wherein the circular shift is performed to the code sequence having the second length such that either a rear portion of the code sequence having the second length moves to a start of the code sequence having the second length, or a front portion of the code sequence having the second length moves to an end of the code sequence having the second length.
2. The method according to claim 1, wherein the part of the code sequence having the first length comprises at least a cyclic prefix or a cyclic postfix.
3. The method according to claim 1, wherein the cyclic extension is performed such that a cyclic postfix of the code sequence having the first length, having the length corresponding to the difference between the first length and the second length, is added to the end of the code sequence having the first length.
4. The method according to claim 1, wherein the code sequence having the first length is a Zadoff-Chu (ZC) sequence.
5. The method according to claim 1, wherein the code sequence having the second length is transmitted as a reference signal sequence.
6. An apparatus for transmitting a code sequence in a wireless communication system, the apparatus comprising:
a code sequence generator for generating a code sequence having a second length by cyclic extension of a code sequence having a first length, and performing a circular shift to the code sequence having the second length; and
a transmitting unit for transmitting the circular shifted code sequence having the second length,
wherein the first length is a largest prime number smaller than the second length,
wherein the cyclic extension of the code sequence having the first length is performed such that a part of the code sequence having the first length, having a length corresponding to a difference between the first length and the second length, is added to either a start or an end of the code sequence having the first length, and
wherein the circular shift is performed to the code sequence having the second length such that either a rear portion of the code sequence having the second length moves to a start of the code sequence having the second length, or a front portion of the code sequence having the second length moves to an end of the code sequence having the second length.
7. The apparatus according to claim 6, wherein the part of the code sequence having the first length comprises at least a cyclic prefix or a cyclic postfix.
8. The apparatus according to claim 6, wherein the cyclic extension is performed such that a cyclic postfix of the code sequence having the first length, having the length corresponding to the difference between the first length and the second length, is added to the end of the code sequence having the first length.
9. The apparatus according to claim 6, wherein the code sequence having the first length is a Zadoff-Chu (ZC) sequence.
10. The apparatus according to claim 6, wherein the code sequence having the second length is transmitted as a reference signal sequence.
11. A method for transmitting a code sequence in a wireless communication system, the method comprising:
performing a circular shift to a code sequence having a first length to produce a circularly-shifted code sequence having the first length;
performing a cyclic extension of the circularly-shifted code sequence having the first length, to produce a code sequence having a second length; and
transmitting the code sequence having the second length,
wherein the first length is a largest prime number smaller than the second length,
wherein performing the circular shift comprises either moving a rear portion of the code sequence having the first length to a start of the code sequence having the first length, or moving a front portion of the code sequence having the first length to an end of the code sequence having the first length, and
wherein performing the cyclic extension comprises adding a portion of the circularly-shifted code sequence having the first length, having a length corresponding to a difference between the first length and the second length, to either a start or an end of the circularly-shifted code sequence having the first length.