CN1124713C - Coding method of indicating whether or not there is some empty time block in public control channel in synchronous channels - Google Patents
Coding method of indicating whether or not there is some empty time block in public control channel in synchronous channels Download PDFInfo
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- CN1124713C CN1124713C CN 99116940 CN99116940A CN1124713C CN 1124713 C CN1124713 C CN 1124713C CN 99116940 CN99116940 CN 99116940 CN 99116940 A CN99116940 A CN 99116940A CN 1124713 C CN1124713 C CN 1124713C
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- time block
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention discloses a method for a base station to indicate whether space-time block codes exist in a main common control channel in synchronous channels, and adopts a mode of phase modulation to main and secondary synchronous channels, wherein when the mode of modulation to the same phase or reverse phases is adopted to the main and secondary synchronous channels, the base station adopts a transmission diversity mode on the basis of space-time block codes to indicate the main common control channel in the synchronous channels. When the mode of modulation to reverse phases or the same phase is adopted to the main and secondary synchronous channels, the base station does not adopt a transmission diversity mode on the basis of space-time block codes to indicate the main common control channel in the synchronous channels. The present invention is simple and reliable, can increase the effect of cell searches and the complexity of system simplification.
Description
The present invention relates to a kind of method of on synchronizing channel, indicating space-time block coding (STTD), relate in particular to a kind of base station and indicating the method that has or not on the Primary Common Control Physical Channel based on the transmission antenna diversity of space-time block coding (STTD) on the primary and secondary synchronizing channel.
Synchronizing channel (SCH) comprises primary synchronization channel and secondary synchronization channel, and they send signal at 256 chips of a time slot in the time.
Transmission antenna diversity (STTD:Space time block coding basedtransmit antenna diversity) based on space-time block coding is a kind of effective ways that are used to strengthen the down link receptivity in the code division multiple access system.Open-Loop Transmit Diversity can be adopted to some channels such as Primary Common Control Physical Channel (PCCPCH), inferior Common Control Channel (SCCPCH) and DPCH as required in the base station, also can not adopt Open-Loop Transmit Diversity.Travelling carriage oppositely inserts needed information and must solve from Primary Common Control Physical Channel (PCCPCH), therefore, travelling carriage must know whether Primary Common Control Physical Channel (PCCPCH) has adopted space-time block coding (STTD) before the information of separating Primary Common Control Physical Channel (PCCPCH).In the Asynchronous Code Division Multiple Access system, travelling carriage at first obtains slot synchronization, frame synchronization by Cell searching, and the scrambler of identification sub-district use.
Having or not the method for the routine of space-time block coding (STTD) on the indication Primary Common Control Physical Channel (PCCPCH) is as shown in Figure 1, among the figure: C
pBe Primary Synchronisation Code, the modulation of a for carrying out on the primary and secondary sign indicating number to the primary and secondary synchronizing channel, C
s I, kBe 16 possible secondary synchronization code, C
s I, 1, C
s I, 2... C
s I, 15Group number i under the long scrambler of indicating cell.Work as a=1, show on Primary Common Control Physical Channel (PCCPCH) and adopted space-time block coding STTD, a=-1 shows at Primary Common Control Physical Channel (PCCPCH) and do not adopt space-time block coding STTD, as shown in Figure 2.This method belongs to binary phase shift keying (BPSK) modulation, and the demodulation of binary phase shift keying (BPSK) is needed a fixed phase.If the fixed phase paraphase, then demodulated data can be just opposite, if promptly fixed phase has the upsets of 180 degree, then can will+1 be demodulated into-1, and general-1 is demodulated into+and 1.In order correctly to demodulate the modulation intelligence a on the synchronizing channel (SCH), the pilot frequency code element phase place that can adopt Common Pilot Channel (CPICH) is as the reference phase place.Promptly estimate the phase place rotation of public pilot channel (CPICH) pilot frequency code element, with this by way of compensation, recover modulation signal a, but do the obvious complexity that increases system like this.
The objective of the invention is to have the defective that has or not the method for space-time block coding STTD on the indication Primary Common Control Physical Channel now, and a kind of method that the proposes Primary Common Control Physical Channel of indicating on synchronizing channel simple, that reduce system complexity has or not the method for space-time block coding in order to overcome.
In order to realize above-mentioned purpose of the present invention, the technical scheme that the present invention takes is: the indication Primary Common Control Physical Channel has or not the method for space-time block coding on the synchronizing channel, be characterized in, the modulation that employing is carried out identical or opposite phase by the base station to the primary and secondary synchronizing channel indicate the Your Majesty altogether channel whether adopt mode based on the space-time block coding transmit diversity, wherein
If the base station indicates the Your Majesty to be total to the mode of channel employing based on the space-time block coding transmit diversity on synchronizing channel during the modulation system of the settled approximately primary and secondary synchronizing channel employing of a same phase, then when the primary and secondary synchronizing channel adopted the modulation system of opposite phase, the base station indicates the Your Majesty to be total to channel on synchronizing channel did not have the mode of employing based on the space-time block coding transmit diversity;
When if the settled approximately primary and secondary synchronizing channel of b adopts the modulation system of opposite phase, the base station indicates the Your Majesty to be total to the mode of channel employing based on the space-time block coding transmit diversity on synchronizing channel, then when the primary and secondary synchronizing channel adopted the modulation system of same phase, the base station indicates the Your Majesty to be total to channel on synchronizing channel did not have the mode of employing based on the space-time block coding transmit diversity.
The indication Primary Common Control Physical Channel has or not the method for space-time block coding on the above-mentioned synchronizing channel, and wherein, described modulation is meant to primary and secondary synchronizing channel employing same phase: primary synchronization channel adopts the a=+1 modulation, adopts b=+1 to modulate on secondary synchronization channel; Perhaps, on primary synchronization channel, adopt the a=-1 modulation, on secondary synchronization channel, adopt the b=-1 modulation.
The indication Primary Common Control Physical Channel has or not the method for space-time block coding on the above-mentioned synchronizing channel, and wherein, described modulation is meant to primary and secondary synchronizing channel employing opposite phase: primary synchronization channel adopts the a=-1 modulation, adopts b=+1 to modulate on secondary synchronization channel; Perhaps, on primary synchronization channel, adopt the a=+1 modulation, on secondary synchronization channel, adopt the b=-1 modulation.
The indication Primary Common Control Physical Channel has or not the method for space-time block coding on the above-mentioned synchronizing channel, and wherein, described a represents the phase place of primary synchronization channel; Described b represents the phase place of secondary synchronization channel.
Because the present invention has adopted above technical scheme, does not need to adopt fixed phase, therefore reduced the complexity of system, operate simpler.
Be clearer understanding performance of the present invention, characteristics, existing in conjunction with the embodiments and accompanying drawing be further described.
Fig. 1 is the schematic diagram of prior art to the synchronizing channel modulated process;
Fig. 2 is the modulating-coding schematic diagram of prior art;
Fig. 3 is the schematic diagram of the present invention to the synchronizing channel modulated process;
Fig. 4 is one of modulation coding mode of the present invention schematic diagram;
Fig. 5 is two schematic diagrames of modulation coding mode of the present invention.
See also accompanying drawing 3, Fig. 4, Fig. 5.
Synchronizing channel (SCH) channel comprises primary synchronization channel and secondary synchronization channel, generally speaking, they send signal at 256 chips of a time slot in the time, and space-time block coding STTD Open-Loop Transmit Diversity is a kind of effective ways that are used to strengthen the down link receptivity among the code division multiple access system CDMA.Open-Loop Transmit Diversity can be adopted to some channels such as main CCPCH channel (Primary Common Control Physical Channel), inferior CCPCH channel (inferior Common Control Channel) and DPCH as required in the base station, also can not adopt Open-Loop Transmit Diversity.
In order on the primary and secondary synchronous channel SCH, to indicate whether at one's leisure block encoding (STTD) of Primary Common Control Physical Channel effectively, the present invention proposes the mode that adopts phase modulated.
Modulated process of the present invention as shown in Figure 3, among the figure: C
pBe Primary Synchronisation Code, a is the modulation to carrying out on the primary synchronization channel, and b is the modulation to carrying out on the secondary synchronization channel, C
s I, kBe 16 possible secondary synchronization code, C
s I, 1, C
s I, 2... C
s I, 15Group number i under the long scrambler of indicating cell.
Embodiment 1 (as shown in Figure 4), when base station indication Primary Common Control Physical Channel adopts space-time block coding (STTD), the primary and secondary synchronizing channel is adopted the in-phase modulation mode, that is: primary synchronization channel adopts the modulation of a=1, on secondary synchronization channel, adopt the modulation of b=1, perhaps on primary synchronization channel, adopt the modulation of a=-1, on secondary synchronization channel, adopt the modulation of b=-1.
When base station indication Primary Common Control Physical Channel does not adopt space-time block coding (STTD), the primary and secondary synchronizing channel is adopted outphasing modulation system, for example: primary synchronization channel adopts the modulation of a=-1, adopts the modulation of b=+1 on secondary synchronization channel; Perhaps on primary synchronization channel, adopt the modulation of a=+1, on secondary synchronization channel, adopt the modulation of b=-1.
Above-mentioned a represents the phase place of primary synchronization channel, and b represents the phase place of secondary synchronization channel.
Embodiment 2 (as shown in Figure 5) also can adopt opposite modulation system, when space-time block coding (STTD) is adopted in the base station, the primary and secondary synchronizing channel is adopted outphasing modulation system that is:; When base station indication Primary Common Control Physical Channel does not adopt space-time block coding (STTD), the primary and secondary synchronizing channel is adopted the in-phase modulation mode.
Adopt above technical scheme, without any need for fixed phase, can overcome the problem of receiving and transmitting signal phasing back effectively, for example, when the base station adopts same phase modulation indication Primary Common Control Physical Channel to adopt space-time block coding, travelling carriage judges according to the correlation of primary and secondary synchronous code correlator output whether this two output has identical polarity; If it has identical polarity, think that then Primary Common Control Physical Channel has adopted space-time block coding; If it has opposite polarity, think that then Primary Common Control Physical Channel does not adopt space-time block coding;
Again for example, when the base station adopted opposite phase modulation indication Primary Common Control Physical Channel to adopt space-time block coding, travelling carriage judged according to the correlation of primary and secondary synchronous code correlator output whether this two output has opposite polarity; If it has opposite polarity, think that then Primary Common Control Physical Channel has adopted space-time block coding; If it has identical polarity, think that then Primary Common Control Physical Channel does not adopt space-time block coding.
Above-mentioned detection method is very simple, this be because, the contingent phase place rotation on the primary and secondary synchronizing channel is identical, even without phase reference, also detecting signal that can be correct.
The inventive method is simple and reliable, and at one's leisure whether block encoding (STTD) is accurate on the Primary Common Control Physical Channel of identification primary and secondary synchronizing channel, thereby has improved the efficient of Cell searching, has simplified the complexity of system.
Claims (4)
1, indicate Primary Common Control Physical Channel to have or not the method for space-time block coding on the synchronizing channel, it is characterized in that, the modulation that employing is carried out identical or opposite phase by the base station to the primary and secondary synchronizing channel indicate the Your Majesty altogether channel whether adopt mode based on the space-time block coding transmit diversity, wherein
If the base station indicates the Your Majesty to be total to the mode of channel employing based on the space-time block coding transmit diversity on synchronizing channel during the modulation system of the settled approximately primary and secondary synchronizing channel employing of a same phase, then when the primary and secondary synchronizing channel adopted the modulation system of opposite phase, the base station indicates the Your Majesty to be total to channel on synchronizing channel did not have the mode of employing based on the space-time block coding transmit diversity;
When if the settled approximately primary and secondary synchronizing channel of b adopts the modulation system of opposite phase, the base station indicates the Your Majesty to be total to the mode of channel employing based on the space-time block coding transmit diversity on synchronizing channel, then when the primary and secondary synchronizing channel adopted the modulation system of same phase, the base station indicates the Your Majesty to be total to channel on synchronizing channel did not have the mode of employing based on the space-time block coding transmit diversity.
2, indicate Primary Common Control Physical Channel to have or not the method for space-time block coding on the synchronizing channel according to claim 1, it is characterized in that, described modulation is meant to primary and secondary synchronizing channel employing same phase: primary synchronization channel adopts the a=+1 modulation, adopts b=+1 to modulate on secondary synchronization channel; Perhaps, on primary synchronization channel, adopt the a=-1 modulation, on secondary synchronization channel, adopt the b=-1 modulation.
3, indicate Primary Common Control Physical Channel to have or not the method for space-time block coding on the synchronizing channel according to claim 1, it is characterized in that, described modulation is meant to primary and secondary synchronizing channel employing opposite phase: primary synchronization channel adopts the a=-1 modulation, adopts b=+1 to modulate on secondary synchronization channel; Perhaps, on primary synchronization channel, adopt the a=+1 modulation, on secondary synchronization channel, adopt the b=-1 modulation.
4, have or not the method for space-time block coding according to indication Primary Common Control Physical Channel on claim 2 or the 3 described synchronizing channels, it is characterized in that described a represents the phase place of primary synchronization channel; Described b represents the phase place of secondary synchronization channel.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99116940 CN1124713C (en) | 1999-09-30 | 1999-09-30 | Coding method of indicating whether or not there is some empty time block in public control channel in synchronous channels |
| AU56704/00A AU5670400A (en) | 1999-09-30 | 2000-07-03 | A method for indicating on a synchronal channel if there is any space-time blockcoding in main common control channel |
| PCT/CN2000/000188 WO2001024405A1 (en) | 1999-09-30 | 2000-07-03 | A method for indicating on a synchronal channel if there is any space-time block coding in main common control channel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99116940 CN1124713C (en) | 1999-09-30 | 1999-09-30 | Coding method of indicating whether or not there is some empty time block in public control channel in synchronous channels |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1291014A CN1291014A (en) | 2001-04-11 |
| CN1124713C true CN1124713C (en) | 2003-10-15 |
Family
ID=5279604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99116940 Expired - Fee Related CN1124713C (en) | 1999-09-30 | 1999-09-30 | Coding method of indicating whether or not there is some empty time block in public control channel in synchronous channels |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN1124713C (en) |
| AU (1) | AU5670400A (en) |
| WO (1) | WO2001024405A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2848747A1 (en) * | 2002-12-16 | 2004-06-18 | France Telecom | Pre-coded signal emitting process for wireless communication system, involves interlacing pre-coded transmitted symbols to modify temporal order of symbols and coding each block of symbols according to coding time space |
| CN101729198B (en) * | 2008-10-27 | 2014-04-02 | 华为技术有限公司 | Method, device and system for encoding and decoding |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6185258B1 (en) * | 1997-09-16 | 2001-02-06 | At&T Wireless Services Inc. | Transmitter diversity technique for wireless communications |
| CN1342354A (en) * | 1998-09-04 | 2002-03-27 | 美国电报电话公司 | Combined channel coding and space-block coding in multi-antenna arrangement |
-
1999
- 1999-09-30 CN CN 99116940 patent/CN1124713C/en not_active Expired - Fee Related
-
2000
- 2000-07-03 WO PCT/CN2000/000188 patent/WO2001024405A1/en active Application Filing
- 2000-07-03 AU AU56704/00A patent/AU5670400A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| WO2001024405A1 (en) | 2001-04-05 |
| AU5670400A (en) | 2001-04-30 |
| CN1291014A (en) | 2001-04-11 |
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Applicant after: Huawei Technologies Co., Ltd. Applicant before: Huawei Technology Co., Ltd., Shenzhen City |
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