CN1516367A - System for improving covering range of digital broadcast and its method - Google Patents
System for improving covering range of digital broadcast and its method Download PDFInfo
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- CN1516367A CN1516367A CNA031002994A CN03100299A CN1516367A CN 1516367 A CN1516367 A CN 1516367A CN A031002994 A CNA031002994 A CN A031002994A CN 03100299 A CN03100299 A CN 03100299A CN 1516367 A CN1516367 A CN 1516367A
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Abstract
The invention describes a broadcast system and method, able to transmit digital TV, high-clarity TV, digital sound broadcast, interactive program and broad band media service at the same time to improve the covering range of the digital broadcast by coordinated transmission of primary and secondary nets. It transmits the space coding nonrelative signal from the tow nets, wherein the terminal receives the space coding nonrelative signal implemented by making combined detection on the signal from the two nets and the reception is implemented by combined detection of the signal from the two nets, thus avoiding the problem of signal prohibition and largely improving the receiving reliability by coding gain and macrodiversity gain.
Description
Technical field
The present invention relates to improve the broadcast system and the broadcasting method of the coverage of digital broadcasting, especially relate to collaborative transmission by master network and time network, can send Digital Television simultaneously, the broadcasting of high definition TV, digital audio, interactive program and wide-band bidirectional multimedia service are with the broadcast system and the method for the coverage of improving digital broadcasting.
Background technology
Following received terrestrial digital broadcasting (audio frequency, video, data etc.) will be based upon on the uniform platform, and it can send Digital Television simultaneously, high definition TV, digital audio broadcasting, interactive program and wide-band bidirectional multimedia service.The challenge that realizes above demand is many-sided.Yet most challenges all limit relevant with multipath fading, coverage quick and that shadow fading causes.Coding and deinterleaving method can solve fading problem to a certain extent, unless but the signal strength signal intensity that receives reaches the terminal receive threshold, otherwise, be difficult to solve deep fading's problem.Can not be maintained at some zones on the threshold value in broadcast signal strength, terminal just can not be implemented reliable reception again, thereby causes the blind area effect.In European DVB-T system, the covering of " blind area " is recovered its signal identical that retransfer by " auxiliary transmitter " with the master network station.This " auxiliary transmitter " comes down to a kind of repeater, and it generates and the stronger multipath signal that gets up from the signal combination of main website.Such design can strengthen average signal strength really, but the artificial multipath signal that produces can not alleviate multipath or decline fast, and does not change the decline border under the worst case.In fact, because signal cancellation, they may make signal strength signal intensity become poorer on some is put.
Generally acknowledge in communication circle, if suitably use grand diversity that the most effective means of fast anti-and shadow fading can be provided.Especially, by the radio wave signal of combination from the emission of a plurality of places, grand diversity may be improved the radio wave quality of anywhere.It is opposite with micro diversity, and micro diversity utilizes several radio waves in same place to produce more limited gain.Studies show that grand diversity can be with 6 to 12 decibels of the poorest performance improvements of system.Yet the nearly all macro diversity method that uses today all is to be used for telecommunications to use, and only comprises the switching between transmitter.
Summary of the invention
The objective of the invention is collaborative transmission, can send Digital Television simultaneously by master network and time network, high definition TV, digital audio broadcasting, interactive program and wide-band bidirectional multimedia service are to improve the coverage of digital broadcasting.
According to a first aspect of the invention, the system that improves the coverage of digital broadcasting of the present invention comprises:
Master network, it comprises main launching tower as main transmitter, is used for providing in given market area big as far as possible signal cover; Inferior network comprises microcellulor a plurality of dispersions or cluster time transmitter, is used to expand broadcast singal to cover signal " blind area "; Space Time encoder (STC) is used for the source signal coding is injected intrinsic structural relation between two or more output signal flows, transmits from the main transmitter of master network and the inferior transmitter of time network respectively, to introduce grand diversity; Grand diversity combiner and space-time decoder, two kinds of signals of in the future autonomous network and time network are implemented the space-time decoding.
According to a second aspect of the invention, the system that improves the coverage of digital broadcasting of the present invention further comprises:
Centralized signal generator is made up of signal source, space-time code device and a plurality of modulator, and wherein, the output of space-time code device is converted to analog signal by modulator with digital signal; Modulator can be single carrier or multicarrier (OFDM) modulator, and modulator is passed through in the output of space-time code device, and digital signal is converted to analog signal; The allocated channel that separates is used for analog signal is distributed to main transmitter and time transmitter, then, sends modulation signal by transmitter and time transmitter with preset frequency and power.
According to a third aspect of the invention we, the system that improves the coverage of digital broadcasting of the present invention further comprises:
Centralized signal generator is made up of signal source, space-time code device and fixed timing mark position inserter, and wherein, the output of Space Time Coding utilizes fixed timing mark position inserter to insert fixed timing mark; The allocated channel that separates is used for insertion fixed timing mark digital signal is distributed to main transmitter and time transmitter; Comprise at main transmitter and time transmitter end, one modulator, one external synchronization source, locate to peel off fixed timing mark once more, and the time and the external synchronization source official hour modulated digital signal of the information specifies of utilization in fixed timing mark, then, main transmitter and time transmitter send modulation signal with preset frequency and power.
According to a forth aspect of the invention, the system that improves the coverage of digital broadcasting of the present invention further comprises:
Signal source; The fixed timing mark inserter is used for inserting the fixed timing mark position before giving transmitter with signal distributions; The distribution channel of separating comprises optical fiber, wireless microwave link, satellite, atm network; Transmitter comprises the space-time code device, reception sources signal and produce two coherent signals stream; External synchronization source; Local modulator can be single carrier modulator or multicarrier (OFDM) modulator, is used for modulating the information that is embedded in fixed timing mark and the information of external synchronization source, the output analog signal, and then, transmitter broadcasts the signal of modulation with preset frequency and power.
According to a fifth aspect of the invention, the system that improves the coverage of digital broadcasting of the present invention comprises:
Master network comprises main launching tower as main transmitter, is used for providing in given market area big as far as possible signal cover; Inferior network comprises microcellulor a plurality of dispersions or cluster time transmitter, is used to expand broadcast singal to cover signal " blind area "; Many I/O Space Time encoder (STC), the ST that is used for two or more source signals encodes, the data flow that output separates; Many I/O space-time decoder, two kinds of signals of in the future autonomous network and time network are implemented the space-time decoding respectively.
According to a sixth aspect of the invention, the method for improving the coverage of digital broadcasting of the present invention comprises step:
Utilize Space Time encoder (STC) at first to the source signal coding, between two (or a plurality of) output signal flows, inject intrinsic structural relation; These two (or a plurality of) encoded signals flow points are not transmitted from master network and time network, to introduce grand diversity; With two kinds of signals from master network and time network that terminal receives, enforcement space-time is decoded and is reached higher reception reliability.
According to a seventh aspect of the invention, the method for improving the coverage of digital broadcasting of the present invention further comprises step:
Space Time encoder STC can turn round in open loop, and the time idle bit of trellis and bulk type can use as STC.
According to an eighth aspect of the invention, the method for improving the coverage of digital broadcasting of the present invention further comprises step:
With the space-time signal distributions before the transmitter, utilize centralized generator to produce complete analog signal.
According to a ninth aspect of the invention, the method for improving the coverage of digital broadcasting of the present invention further comprises step:
The signal source generator produces digital source signal; The space-time code device receives source signal and uses one in the Space Time encryption algorithm to produce two Correlated Signals; The output of space-time code device is converted to analog signal by two modulators with digital signal, and modulator can be single carrier or multicarrier (OFDM) modulator; Then, modulation signal utilizes the allocated channel (I and II) of two separation to distribute to main transmitter and time transmitter; At last, main transmitter and time transmitter are gone out the signal broadcasting of accepting with preset frequency and power.
According to the tenth aspect of the invention, the method for improving the coverage of digital broadcasting of the present invention further comprises step:
The digital signal of idle bit when utilizing centralized generator before giving transmitter, only to produce with the space-time signal allocation, this transmitter has the modulator of oneself, and the space-time code digital signal is modulated into analog signal; Centralized signal generator is by signal source, space-time (or spatial frequency, or their combination) encoder.The signal source generator produces digital source signal S (n) (for example, video, audio frequency, data) and sends on radio network; A kind of algorithm during use space-time code device is accepted source signal and utilized the Space Time Coding algorithm produces two relevant signal flows; Signal flow flows to before the transmitter by the allocated channel that separates, and utilizes the fixed timing mark position to insert fixed timing mark in the output of Space Time Coding; At main transmitter and time transmitter, the ST coded digital signal is at first peeled off fixed timing mark; Then, local modulator utilizes embedding to be pressed in time and the external synchronization source official hour modulated digital signal of the information specifies in the fixed timing mark again, exports analog signal; Then, main transmitter and time transmitter are sent out modulation signal with preset frequency and power.
According to an eleventh aspect of the invention, the method for improving the coverage of digital broadcasting of the present invention further comprises step:
Two or more source signals are used for the ST encoder; By using a plurality of antennas in base station and terminal, utilize multiple-input and multiple-output (MIMO) to increase data transfer rate, the data flow of separation can be transmitted simultaneously at different antennas, thereby increase data transfer rate widely.
Description of drawings
Fig. 1 is the system configuration schematic diagram with main and secondary radio network;
Fig. 2 is to use according to the schematic diagram of describing coding and grand diversity operation in the hierarchical network of broadcasting method of the present invention;
Fig. 3 is the block diagram of the grand diversity analogue signal generating of display set Chinese style step;
Fig. 4 is the block diagram that the grand diversity digital signal of display set Chinese style produces step;
Fig. 5 shows that distributed macrodiversity signal produces the block diagram of step.
Fig. 6 utilizes MIMO to increase the schematic diagram of data movement capacity;
Embodiment
Fig. 1 is the system configuration schematic diagram with main radio network and time radio network that improves the coverage of digital broadcasting of the present invention;
The system that improves the coverage of digital broadcasting of the present invention has utilized two layers structural system, and it comprises the inferior network of a grand covering master network (being the TV/broadcasting station that has than large coverage in typical case) and a distribution.The center of master network is that a height with high power broadcast singal sends tower, and as main reflector, its target is that big as far as possible coverage is provided in given market area.Inferior network comprises microcellulor a plurality of dispersions or cluster as shown in Figure 1, as inferior reflector.Their function is that the expansion broadcast singal is to cover " blind area "
Fig. 2 is to use according to the schematic diagram of describing coding and grand diversity operation in the hierarchical network of broadcasting method of the present invention.Network of the present invention solves decline with a more strong design that comprises coding and grand diversity, rather than uses " auxiliary transmitter " of advising among the DVB-T.
The most important innovation of the system of the coverage of improving digital broadcasting of the present invention is cooperation wise between these two networks, improving the performance of whole network, rather than simply from master network and time identical broadcast singal of network transmission.
As showing among Fig. 2, method of the present invention has the following steps:
(1) Space Time encoder (STC) injects intrinsic structural relation at first to source signal (video, audio frequency, data etc.) coding between two (or being a plurality of in some cases) output signal flows.
(2) these two (or a plurality of) encoded signals flow points do not transmit from master network and time network, to introduce grand diversity.
(3) terminal receives two kinds of signals from master network and time network, and enforcement space-time is decoded and reached higher reception reliability.
Because STC does not require the channel condition information in the conveyer, so it can turn round in open loop, this is very desirable to unidirectional broadcasted application.In other various possibilities, the time idle bit of trellis and bulk type can use as STC.
Fig. 3 to Fig. 5 is the embodiment of system of the present invention, shown in Fig. 3-5, include only transmitter in the system one time, yet in practice, inferior network comprises the transmitter of the same broadcast capability of several execution.For this reason, we only need be primarily focused on one transmitter and all inferior transmitters need not be described.The concentrated generation of analog signal
Fig. 4 has illustrated the configuration and the method for spacing wave when central point produces simulation, with the space-time signal distributions before the transmitter, centralized generator produces complete analog signal.
Centralized signal generator is to be made up of signal source, space-time code device (or spatial frequency, or their combination) and two modulators.
The signal source generator produces digital source signal s (n), and (for example, video, audio frequency, data) are by the radio network granting.
The space-time code device receives source signal and uses one in the Space Time encryption algorithm to produce two Correlated Signals, X
I(n), X
II(n), STC can be divided into two classes: trellis sign indicating number and block sign indicating number.In other possible selection, the block coding of Space Time can be used to allow low complex degree, the encoder of maximum comparability.Again with the combination of other chnnel coding, LDPC sign indicating number for example, this pattern can provide the coding gain of highly diverse and moderate complexity.
The output of space-time code device is converted to analog signal with digital signal, X by two modulators
I(t), X
II(t).Modulator can be common single carrier or multicarrier (OFDM) modulator.Then, modulation signal utilizes the allocated channel (I and II) of two separation to distribute to main transmitter (transmitter I) and time transmitter (transmitter II), and these two allocated channels can be the same or different.Possible distributor comprises standard frequency modulation SHF link or analog satellite channel.The method of the reliable distribution analog signal of other span length's distance also is possible.Then, main transmitter (I) and time transmitter (II) are broadcasted away acknowledge(ment) signal when preset frequency and power.
The concentrated generation of digital signal
Fig. 5 has illustrated the method for spacing wave when central point produces numeral.The digital signal of idle bit when centralized generator only produced before giving the transmission tower with the space-time signal allocation, this transmission tower has the modulator of oneself, and the space-time code digital signal is modulated into analog signal.
Centralized signal generator is by signal source, space-time (or spatial frequency, or their combination) encoder.The signal source generator produces digital source signal S (n) (for example, video, audio frequency, data) and sends on radio network.
The space-time code device is accepted source signal and is produced two relevant signal flows, X
I(n), X
II(n), a kind of algorithm in the use Space Time Coding algorithm.
The output of Space Time Coding utilizes the fixed timing mark position to insert fixed timing mark, and allocated channel I by two separation and II (transmitter I) and inferior transmitter (transmitter II) are before.Two allocated channels can be the same or different.Possible distribution setting comprises: optical fiber, wireless microwave link, satellite, atm network etc.Other also is possible at long reliable fashion apart from the distribute digital signal.
At main transmitter and time transmitter, the ST coded digital signal is at first peeled off fixed timing mark.Then, local modulator is utilizing embedding to be pressed in the time and an external synchronization source (for example, GPS recipient) the official hour modulated digital signal of the information specifies in the fixed timing mark.The output of two modulators is analog signal X
I(t), X
II(t), modulator can be a common single year sign indicating number modulator or many carrier waves (OFDM) modulator.
Then, main transmitter (I) and time transmitter (II) are sent out modulation signal with preset frequency and power.
The distribution of signal produces
Fig. 5 illustrates that digital source signal is distributed to main transmitter and time transmitter.Each transmitter has ST encoder and the modulator of itself.
Source signal distributes in the distribution channel (I and II) by two separation and gives main transmitter (transmitter I) and time transmitter (transmitter II) before.Insert fixed timing mark earlier.These two distribution channel can be the same or different.Possible distribution apparatus comprises, optical fiber, and wireless microwave link, satellite, atm network etc., other reliable method in long distance issue digital signal also is possible.
At main transmitter, digital source signal is at first peeled off fixed timing mark.At the space-time code device reception sources signal of main transmitter and produce two coherent signals streams, X
I(n), X
II(n), use predetermined space-time code algorithm-identical space-time code device to be used for whole work.At the local modulator of main transmitter, modulate X then
I(n), by being embedded in the information in the fixed timing mark and the information of external synchronization source (for example OTPS receiver).The output of modulator is an analog signal X
I(t).Modulator can be single carrier wave or multicarrier (OFDM) modulator.Same modulator is used for whole network.Then, main transmitter (I) broadcasts the signal X of modulation with preset frequency and power
I(t).
At inferior transmitter, digital source signal is at first peeled off fixed timing mark.At the space-time code device reception sources signal of inferior transmitter and produce two coherent signals stream X
I(n) and X
II(n), use predetermined space-time code algorithm-same encoder to be used for whole network.
Then, at the local modulator of inferior transmitter, utilize the time modulation signal X that is embedded in the information specifies in fixed timing mark and the external synchronization source (for example GPS player)
II(n), the output of modulator is an analog signal X
II(t).Modulator can be single carrier modulator or multicarrier (OFDM) modulator.Same modulator is used for whole network, and then, inferior transmitter (II) broadcasts modulation signal X with the power of preset frequency
II(t).
Fig. 6 utilizes multiple-input and multiple-output (MIMO) to increase the schematic diagram of data movement capacity; This situation occurs in some zones, and situation is opposite with the situation of blind area in this zone, and is strong equally with the received signal that time network receives from master network.In this case, by using a plurality of antennas, can utilize multiple-input and multiple-output (MIMO) to increase data transfer rate in base station and terminal.The target of MIMI is to improve capacity gain under best situation, rather than improves worst condition.By the usage space treatment technology, a plurality of I/O channels can be reduced to some parallel uncorrelated channels.Like this, the data flow of separation can transmit simultaneously at different antennas, thereby increases data transfer rate widely.
Above-mentioned all system and methods of the present invention are used in signal MIMO (multiple-input and multiple-output) situation, and unique difference is to be: two or more source signals are used for the ST encoder.
Claims (11)
1. system that improves the coverage of digital broadcasting is characterized in that comprising:
Master network comprises main launching tower as main transmitter, is used for providing in given market area big as far as possible signal cover;
Inferior network comprises microcellulor a plurality of dispersions or cluster time transmitter, is used to expand broadcast singal to cover signal " blind area ";
Space Time encoder (STC) is used for the source signal coding is injected intrinsic structural relation between two or more output signal flows, transmits from the main transmitter of master network and the inferior transmitter of time network respectively, to introduce grand diversity;
Grand diversity combiner and space-time decoder, two kinds of signals of in the future autonomous network and time network are implemented the space-time decoding.
2. according to the system of the coverage of improving digital broadcasting of claim 1, it is characterized in that further comprising:
Centralized signal generator is made up of signal source, space-time code device and a plurality of modulator, and wherein, the output of space-time code device is converted to analog signal by modulator with digital signal;
Modulator can be single carrier or multicarrier (OFDM) modulator, and the digital signal that the space-time code device is exported is converted to analog signal;
The allocated channel that separates is used for analog signal is distributed to main transmitter and time transmitter, then, sends modulation signal by transmitter and time transmitter with preset frequency and power.
3. according to the system of the coverage of improving digital broadcasting of claim 1 or 2, it is characterized in that further comprising:
Centralized signal generator is made up of signal source, space-time code device and fixed timing mark position inserter, wherein,
The output of Space Time Coding utilizes fixed timing mark position inserter to insert fixed timing mark;
The allocated channel that separates is used for insertion fixed timing mark digital signal is distributed to main transmitter and time transmitter;
Comprise at main transmitter and time transmitter end, one modulator and an external synchronization source, peel off fixed timing mark herein, and the time and the external synchronization source official hour modulated digital signal of the information specifies of utilization in fixed timing mark, then, main transmitter and time transmitter send modulation signal with preset frequency and power.
4. according to the system of the coverage of improving digital broadcasting of claim 1, it is characterized in that further comprising:
Signal source;
The fixed timing mark inserter is used for inserting the fixed timing mark position before giving transmitter with signal distributions;
The distribution channel of separating comprises optical fiber, wireless microwave link, satellite, atm network;
Transmitter comprises the space-time code device, reception sources signal and produce two coherent signals stream;
External synchronization source;
Local modulator can be single carrier modulator or multicarrier (OFDM) modulator, is used for modulating the information that is embedded in fixed timing mark and the information of external synchronization source, the output analog signal, and then, transmitter broadcasts the signal of modulation with preset frequency and power.
5. system that improves the coverage of digital broadcasting is characterized in that comprising:
Master network comprises main launching tower as main transmitter, is used for providing in given market area big as far as possible signal cover;
Inferior network comprises microcellulor a plurality of dispersions or cluster time transmitter, is used to expand broadcast singal to cover signal " blind area ";
Many I/O Space Time encoder (STC), the ST that is used for two or more source signals encodes, the data flow that output separates;
Many I/O space-time decoder, two kinds of signals of in the future autonomous network and time network are implemented the space-time decoding respectively.
6. method of improving the coverage of digital broadcasting is characterized in that:
Utilize Space Time encoder (STC) at first to the source signal coding, between two (or a plurality of) output signal flows, inject intrinsic structural relation.
These two (or a plurality of) encoded signals flow points are not transmitted from master network and time network, to introduce grand diversity.
With two kinds of signals from master network and time network that terminal receives, enforcement space-time is decoded and is reached higher reception reliability.
7. according to the method for the coverage of improving digital broadcasting of claim 7, it is characterized in that:
Space Time encoder STC can turn round in open loop, and the time idle bit of trellis and bulk type can use as STC.
8. according to the method for the coverage of improving digital broadcasting of claim 7, it is characterized in that:
With the space-time signal distributions before the transmitter, utilize centralized generator to produce complete analog signal.
9. according to the method for the coverage of improving digital broadcasting of claim 7, it is characterized in that:
The signal source generator produces digital source signal;
The space-time code device receives source signal and uses one in the Space Time encryption algorithm to produce two Correlated Signals;
The output of space-time code device is converted to analog signal by two modulators with digital signal, and modulator can be single carrier or multicarrier (OFDM) modulator; Then,
Modulation signal utilizes the allocated channel (I and II) of two separation to distribute to main transmitter and time transmitter;
At last, main transmitter and time transmitter are gone out the signal broadcasting of accepting with preset frequency and power.
10. according to the method for the coverage of improving digital broadcasting of claim 7, it is characterized in that:
The digital signal of idle bit when utilizing centralized generator before giving transmitter, only to produce with the space-time signal allocation, this transmitter has the modulator of oneself, and the space-time code digital signal is modulated into analog signal;
Centralized signal generator is by signal source, space-time (or spatial frequency, or their combination) encoder.The signal source generator produces digital source signal S (n) (for example, video, audio frequency, data) and sends on radio network.
A kind of algorithm during use space-time code device is accepted source signal and utilized the Space Time Coding algorithm produces two relevant signal flows;
Signal flow flows to before the transmitter by the allocated channel that separates, and utilizes the fixed timing mark position to insert fixed timing mark in the output of Space Time Coding;
At main transmitter and time transmitter, the ST coded digital signal is at first peeled off fixed timing mark;
Then, local modulator utilizes embedding to be pressed in time and the external synchronization source official hour modulated digital signal of the information specifies in the fixed timing mark again, exports analog signal;
Then, main transmitter and time transmitter are sent out modulation signal with preset frequency and power.
11. the method according to the coverage of improving digital broadcasting of claim 7 is characterized in that:
Two or more source signals are used for the ST encoder;
By using a plurality of antennas in base station and terminal, utilize multiple-input and multiple-output (MIMO) to increase data transfer rate, the data flow of separation can be transmitted simultaneously at different antennas, thereby increase data transfer rate widely.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031002994A CN100566217C (en) | 2003-01-09 | 2003-01-09 | Improve the system and method for the coverage of digital broadcasting |
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| CNB031002994A CN100566217C (en) | 2003-01-09 | 2003-01-09 | Improve the system and method for the coverage of digital broadcasting |
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| CN100566217C CN100566217C (en) | 2009-12-02 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1841974B (en) * | 2005-01-27 | 2011-04-20 | Lg电子株式会社 | Broadcasting terminal and viewing method |
| CN102318245A (en) * | 2008-12-10 | 2012-01-11 | 阿斯特里姆有限公司 | Content broadcasting |
| CN102572442A (en) * | 2010-12-28 | 2012-07-11 | 国家广播电影电视总局广播科学研究院 | Method and system of diversity of audio video broadcasting service |
-
2003
- 2003-01-09 CN CNB031002994A patent/CN100566217C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1841974B (en) * | 2005-01-27 | 2011-04-20 | Lg电子株式会社 | Broadcasting terminal and viewing method |
| CN102318245A (en) * | 2008-12-10 | 2012-01-11 | 阿斯特里姆有限公司 | Content broadcasting |
| CN102572442A (en) * | 2010-12-28 | 2012-07-11 | 国家广播电影电视总局广播科学研究院 | Method and system of diversity of audio video broadcasting service |
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| Publication number | Publication date |
|---|---|
| CN100566217C (en) | 2009-12-02 |
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