CN101471755B - Transmitter and signal transmission method - Google Patents
Transmitter and signal transmission method Download PDFInfo
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- CN101471755B CN101471755B CN2007103040725A CN200710304072A CN101471755B CN 101471755 B CN101471755 B CN 101471755B CN 2007103040725 A CN2007103040725 A CN 2007103040725A CN 200710304072 A CN200710304072 A CN 200710304072A CN 101471755 B CN101471755 B CN 101471755B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
- H04B7/0671—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different delays between antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
- H04B7/0669—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different channel coding between antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/068—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission using space frequency diversity
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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
- H04L1/0637—Properties of the code
- H04L1/0643—Properties of the code block codes
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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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0059—Convolutional codes
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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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0067—Rate matching
- H04L1/0068—Rate matching by puncturing
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention provides a signal transmission method and a transmitter thereof, which belong to the technical field of transmitter-side signal processing. The method comprises the following steps: performing space-time block coding of a bit stream; modulating the space-time block coding result by means of orthogonal frequency division multiplexing (OFDM), and treating the OFDM result by means of cyclic delay diversity. The signal transmission method achieves the effects of full diversity gain and coding gain at the same time.
Description
Technical field
The present invention relates to the signal processing technology of communication system transmitter end, particularly relate to a kind of signal transmitting method and transmitter.
Background technology
CDD (cyclic delay diversity, cyclic delay diversity) is a kind of signal processing by transmitter terminal, utilizes frequency diversity to reach the technology of transmit diversity effect.In conjunction with technology such as forward error correction codings, CDD not only can obtain the part coding gain, reduce BER (Bit Error Rate effectively, the error rate), but also can reduce the complexity that receiver designs, the number of configure transmitter antenna neatly in the emission process simultaneously be a kind of practicality and effective many antennas lift-off technology, but this technology is difficult to realize the full diversity gain; STBC (Space Time Block Code, space-time block code) is another kind of important many antennas lift-off technology, and its feature mainly comprises: can realize that full diversity, decoding scheme are simple.But its shortcoming is not contribute coding gain, and the implementation of space-time block code is limited by the number of transmitting antenna, neatly the number of configure transmitter antenna.
The basic principle of cyclic delay diversity is b0 through the output bit flow after convolutional encoding, the bit process in early stage such as punching, interweave as shown in Figure 1, b1, ..., bn is by the modulation mapping, obtain modulation symbol S1, S2 ..., Sm, modulation symbol carry out OFDM (Orthogonal FrequencyDivision Multiplexing, OFDM) modulation through string and after changing, process and commentaries on classics string produce time-domain signal F1 again, F2 ..., Fm.Time-domain signal copies as K part before launching, first part maintains the original state, there is not any delay, represent other every part difference circulation delay d1, d2 with d0, ..., dK sample adds each part time-domain signal cyclic prefix CP (to prevent the intersymbol interference of OFDM) then, at last through launching by K antenna after up-conversion and the power amplification.
The basic principle of space-time block code is b0 through the output bit flow after convolutional encoding, the bit process in early stage such as punching, interweave as shown in Figure 2, b1, ..., bn is by the modulation mapping, obtain modulation symbol S1, S2 ..., Sm, modulation symbol is through carrying out the STBC coding after dividing into groups, and establishing number of transmit antennas is Nt, then the line number of STBC matrix is Nt, the STBC matrix column is counted C and is determined (for example, Nt=2, C=2 by Nt; Nt=4, C=8, or the like), each row of STBC matrix corresponding a transmitting antenna, behind each STBC coding of passing through output signal modulation produces time-domain signal through OFDM, add Cyclic Prefix then, at last through launching by Nt antenna after up-conversion and the power amplification.
As noted earlier, cyclic delay diversity emission and space-time block code are launched these two kinds of schemes all separately shortcoming, the former shortcoming is to be difficult to realize the full diversity gain, the latter's shortcoming is not contribute coding gain, and the space-time block code plan is limited by the number of transmitting antenna, neatly the number of configure transmitter antenna.
Summary of the invention
The purpose of this invention is to provide a kind of signal transmitting method and transmitter, solve the technical problem that prior art can not realize full diversity gain and coding gain simultaneously.
To achieve these goals, the invention provides a kind of signal transmitting method, comprising: bit is flow to the line space time block code; Result to space-time block code carries out the OFDM modulation; Result to the OFDM modulation carries out the cyclic delay diversity processing.
Preferably, above-mentioned method, the described step that bit is flow to the line space time block code specifically comprises: the bit stream of input is carried out processing in early stage; Bit stream after handling early stage is modulated and shone upon; The modulation signal that obtains after modulation and the mapping is divided into groups, and select the space-time block coding mode; Carry out space-time block code, generate Nt road output signal, wherein Nt is the line number of the matrix of described space-time block code.
Preferably, above-mentioned method described is in earlier stage handled and is comprised: convolutional encoding, punchinges and interleaving treatment.
Preferably, above-mentioned method, described result to the space-time block code step of carrying out OFDM modulation specifically comprises: respectively the described output signal in every road is carried out the OFDM modulation; Generate Nt road orthogonal frequency-division multiplex singal.
Preferably, above-mentioned method, the step that described result to the OFDM modulation carries out the cyclic delay diversity processing specifically comprises: according to the antenna number K of cyclic delay diversity, every road signal after the OFDM modulation is all copied as this signal of K increment, first this signal of increment maintains the original state, and all the other every these signals of increment circulation delay respectively obtain the sample signal that K-1 part has delay; On the circuit of the described sample signal that delay arranged, add soft control switch; Carry out the Combined Treatment of space-time block code and cyclic delay diversity if desired, then have the sample signal of delay to join output stream with described by the described switch of closure; Only carry out space-time block code if desired and handle, then stop and describedly have the sample signal of delay to enter output stream by opening described switch; All sample signals that add output stream are all added Cyclic Prefix; The sample signal that adds Cyclic Prefix is carried out sending into transmitting antenna after up-conversion and the power amplification.
To achieve these goals, the present invention also provides a kind of signal transmitter, comprising: the space-time block code module is used for the bit stream of input is carried out space-time block code; The OFDM modulation module is used for the result of space-time block code is carried out the OFDM modulation; The cyclic delay diversity processing module is used for the result of OFDM modulation is carried out the cyclic delay diversity processing.
Preferably, above-mentioned transmitter, described space-time block code module specifically comprises and being linked in sequence: early stage processing unit, be used for will input bit stream carry out processing in early stage; Modulation and map unit are used for the bit stream after handling early stage is modulated and shone upon; Coding unit is used for the modulation signal that obtains after modulation and the mapping is divided into groups, and selects the space-time block coding mode, and the line space of going forward side by side time block code generates Nt road output signal, and wherein Nt is the line number of the matrix of described space-time block code.
Preferably, above-mentioned transmitter, described cyclic delay diversity processing module specifically comprises: K bar circuit, being used for the every road signal replication after the OFDM modulation is this signal of K increment, first this signal of increment maintains the original state, and all the other every these signals of increment circulation delay respectively obtain the sample signal that K-1 part has delay; K-1 control switch, being separately positioned on described K-1 has on the circuit of sample signal of delay.
Preferably, above-mentioned transmitter, described control switch are can be by the soft switch of software implementation control.
The technique effect of the embodiment of the invention is:
1) embodiment of the invention adopts space-time block code in transmitter front ends, can realize full gain, and is not subject to number of transmit antennas, but the flexible configuration transmitting antenna;
2) because transmitter has adopted the cyclic delay diversity emission on the basis of space-time block code, therefore greatly reduce, can obtain extra emission diversity gain simultaneously the receiver designing requirement.
3) adopt soft control switch can be easily to unite between the emission and select, have certain compatibility at space-time block code emission and cyclic delay diversity and space-time block code.
Description of drawings
Fig. 1 is the cyclic delay diversity emission schematic diagram of K=4;
Fig. 2 is the space-time block code emission schematic diagram of Nt=4;
The basic principle figure that 2 * 2STBC that Fig. 3 provides for the embodiment of the invention and cyclic delay diversity are united emission;
The basic principle figure that 4 * 4 STBC that Fig. 4 provides for the embodiment of the invention and cyclic delay diversity are united emission;
The flow chart of steps of the signal emission side that Fig. 5 provides for the embodiment of the invention;
The structure chart of the transmitter that Fig. 6 provides for the embodiment of the invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer, specific embodiment is described in detail below in conjunction with accompanying drawing.
The embodiment of the invention adopts space-time block code in transmitter front ends, after coding output result carries out the OFDM modulation, to the ofdm signal of output, carry out cyclic delay diversity in the rear end and handle, and added soft control switch on the circuit that delay sample is arranged in cyclic delay diversity is handled.Merge the advantage of cyclic delay diversity and space-time block code, overcome their shortcoming, and had certain compatibility.
Fig. 3 and Fig. 4 are respectively 2 * 2 STBC and 4 * 4 STBC and cyclic delay diversity and unite the basic principle figure of emission, as shown in Figure 3 and Figure 4, through the output bit flow after convolutional encoding, the bit process in early stage such as punching, interweave is b0, b1 ..., bn, by the modulation mapping, obtain modulation symbol S1, S2 ..., Sm, modulation symbol carries out the STBC coding through grouping, and the number of transmit antennas of establishing the STBC correspondence is Nt, then the line number of STBC matrix is Nt, the STBC matrix column is counted C and is determined (for example, Nt=2, C=2 by Nt; Nt=4, C=8, or the like), corresponding OFDM symbol-modulated module of each row of STBC matrix, through behind the STBC coding output signal modulation produces one road time-domain signal through OFDM, and add Cyclic Prefix.Each road time-domain signal copies as K part before launching, first part maintains the original state, and does not have any delay, represent other every part difference circulation delay d1, d2 with d0, ..., dK sample is at last through launching by Nt * K antenna after up-conversion and the power amplification.
In order to reach the compatibility with the space-time block code plan, the embodiment of the invention has increased soft control switch (can adopt software or hardware to control) at the inlet of circulation delay, when needs CDD, soft control switch closure, realize uniting of STBC and CDD launching processing, when not needing CDD to handle, soft control switch disconnects, and only carries out the processing of STBC.As can be seen, when switch disconnected, what frame of broken lines was partly represented was the space-time block code launch scenario from Fig. 3 and Fig. 4, and when switch closure, what the dot-dash wire frame was partly represented is the cyclic delay diversity launch scenario.
The flow chart of steps of the signal emission side that Fig. 5 provides for the embodiment of the invention, as figure, performing step comprises:
The structure chart of the transmitter that Fig. 6 provides for the embodiment of the invention.As figure, transmitter comprises and being linked in sequence:
Space-time block code module 61 is used for the bit stream of input is carried out space-time block code;
OFDM modulation module 62 is used for the result of space-time block code is carried out the OFDM modulation;
Cyclic delay diversity processing module 63 is used for the result of OFDM modulation is carried out the cyclic delay diversity processing.
Described space-time block code module 61 specifically comprises and being linked in sequence: early stage processing unit 611, be used for will input bit stream carry out processing in early stage; Modulation and map unit 612 are used for the bit stream after the early stage processing is modulated and shone upon; Coding unit 613 is used for the modulation signal that obtains after modulation and the mapping is divided into groups, and selects the space-time block coding mode, and the line space of going forward side by side time block code generates Nt road output signal, and wherein Nt is the line number of the matrix of described space-time block code.
Described cyclic delay diversity processing module 63 specifically comprises:
K bar circuit is used for the described orthogonal frequency-division multiplex singal in every road is copied as this signal of K increment, and first this signal of increment maintains the original state, and all the other every these signals of increment circulation delay respectively obtain the sample signal that K-1 part has delay;
K-1 control switch, being separately positioned on described K-1 has on the circuit of sample signal of delay;
K prefix unit is separately positioned on the end of described K bar circuit, is used for sample signal is added Cyclic Prefix, and will adds that the sample signal of Cyclic Prefix carries out sending into transmitting antenna after up-conversion and the power amplification.Described control switch is can be by the soft switch of software implementation control.
As from the foregoing, adopt the advantage of the embodiment of the invention to be:
1) embodiment of the invention adopts space-time block code in transmitter front ends, can realize full gain, and is not subject to number of transmit antennas, but the flexible configuration transmitting antenna;
2) because transmitter has adopted the cyclic delay diversity emission on the basis of space-time block code, therefore greatly reduce, can obtain extra emission diversity gain simultaneously the receiver designing requirement.
3) adopt soft control switch can be easily to unite between the emission and select, have certain compatibility at space-time block code emission and cyclic delay diversity and space-time block code.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. a signal transmitting method is characterized in that, comprising:
Bit is flow to the line space time block code;
Result to space-time block code carries out the OFDM modulation;
Result to the OFDM modulation carries out the cyclic delay diversity processing, specifically comprise: according to the antenna number K of cyclic delay diversity, every road signal after the OFDM modulation is all copied as this signal of K increment, first this signal of increment maintains the original state, and all the other every these signals of increment circulation delay respectively obtain the sample signal that K-1 part has delay; On the circuit of the described sample signal that delay arranged, add soft control switch; Carry out the Combined Treatment of space-time block code and cyclic delay diversity if desired, then have the sample signal of delay to join output stream with described by the described switch of closure; Only carry out space-time block code if desired and handle, then stop and describedly have the sample signal of delay to enter output stream by opening described switch.
2. method according to claim 1 is characterized in that, the described step that bit is flow to the line space time block code specifically comprises:
The bit stream of input is carried out the processing in early stage;
Bit stream after handling early stage is modulated and shone upon;
The modulation signal that obtains after modulation and the mapping is divided into groups, and select the space-time block coding mode;
Carry out space-time block code, generate Nt road output signal, wherein Nt is the line number of the matrix of described space-time block code.
3. method according to claim 2 is characterized in that, described in earlier stage handles to comprise: convolutional encoding, punching and interleaving treatment.
4. method according to claim 2 is characterized in that, the step that described result to space-time block code carries out the OFDM modulation specifically comprises:
Respectively the described output signal in every road is carried out the OFDM modulation;
Generate Nt road orthogonal frequency-division multiplex singal.
5. method according to claim 4 is characterized in that, the step that described result to the OFDM modulation carries out the cyclic delay diversity processing specifically also comprises:
All sample signals that add output stream are all added Cyclic Prefix;
The sample signal that adds Cyclic Prefix is carried out sending into transmitting antenna after up-conversion and the power amplification.
6. a signal transmitter is characterized in that, comprising:
The space-time block code module is used for the bit stream of input is carried out space-time block code;
The OFDM modulation module is used for the result of space-time block code is carried out the OFDM modulation;
The cyclic delay diversity processing module is used for the result of OFDM modulation is carried out the cyclic delay diversity processing;
Described cyclic delay diversity processing module specifically comprises:
K bar circuit, being used for the every road signal replication after the OFDM modulation is this signal of K increment, and first this signal of increment maintains the original state, and all the other every these signals of increment circulation delay respectively obtain the sample signal that K-1 part has delay;
K-1 control switch, being separately positioned on described K-1 has on the circuit of sample signal of delay.
7. transmitter according to claim 6 is characterized in that, described space-time block code module specifically comprises and being linked in sequence:
Early stage, processing unit was used for the bit stream of input is carried out the processing in early stage;
Modulation and map unit are used for the bit stream after handling early stage is modulated and shone upon;
Coding unit is used for the modulation signal that obtains after modulation and the mapping is divided into groups, and selects the space-time block coding mode, and the line space of going forward side by side time block code generates Nt road output signal, and wherein Nt is the line number of the matrix of described space-time block code.
8. transmitter according to claim 7 is characterized in that, described control switch is can be by the soft switch of software implementation control.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007103040725A CN101471755B (en) | 2007-12-24 | 2007-12-24 | Transmitter and signal transmission method |
| PCT/CN2008/002010 WO2009092183A1 (en) | 2007-12-24 | 2008-12-15 | Signal transmission method and transmitter |
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| CN2007103040725A CN101471755B (en) | 2007-12-24 | 2007-12-24 | Transmitter and signal transmission method |
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| CN101471755A CN101471755A (en) | 2009-07-01 |
| CN101471755B true CN101471755B (en) | 2011-08-24 |
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| CN101944988B (en) * | 2009-07-08 | 2013-07-24 | 上海无线通信研究中心 | Transmitting device and receiving device of spectral domain channel multiplexing transmission system and method thereof |
| CN101997798B (en) * | 2009-08-13 | 2013-05-01 | 上海无线通信研究中心 | Transmitting and receiving devices of spectrum division multi-address access system and uplink and downlink access system |
| CN102812763B (en) * | 2009-09-21 | 2015-04-15 | 苹果公司 | Signaling and channel estimation for uplink transmit diversity |
| CN101860514B (en) * | 2010-05-24 | 2012-09-26 | 航天恒星科技有限公司 | Unequal error protection method based on self-adaptive symbol carrier allocation |
| US8995320B2 (en) * | 2012-04-16 | 2015-03-31 | Qualcomm Incorporated | Systems and methods of using space time block codes |
Citations (5)
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| CN1770658A (en) * | 2004-10-13 | 2006-05-10 | 三星电子株式会社 | Transmission apparatus and method for a base station using block coding and cyclic delay diversity techniques in an OFDM mobile communication system |
| CN1859068A (en) * | 2005-05-08 | 2006-11-08 | 北京三星通信技术研究有限公司 | Time-space code transmitting and receiving method of multiple antenna communication system |
| CN1956350A (en) * | 2005-10-25 | 2007-05-02 | 华为技术有限公司 | Multi-antenna transmitting system method of radio signal and radio communication system |
| CN1964218A (en) * | 2005-11-09 | 2007-05-16 | 华为技术有限公司 | A multi-antenna transmission system of wireless signal, method and wireless communication system |
| CN101057417A (en) * | 2004-09-03 | 2007-10-17 | 高通股份有限公司 | Spatial spreading with space-time and space-frequency transmit diversity schemes for a wireless communication system |
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| TWI431990B (en) * | 2006-01-11 | 2014-03-21 | Interdigital Tech Corp | Method and apparatus for implementing space time processing with unequal modulation and coding schemes |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101057417A (en) * | 2004-09-03 | 2007-10-17 | 高通股份有限公司 | Spatial spreading with space-time and space-frequency transmit diversity schemes for a wireless communication system |
| CN1770658A (en) * | 2004-10-13 | 2006-05-10 | 三星电子株式会社 | Transmission apparatus and method for a base station using block coding and cyclic delay diversity techniques in an OFDM mobile communication system |
| CN1859068A (en) * | 2005-05-08 | 2006-11-08 | 北京三星通信技术研究有限公司 | Time-space code transmitting and receiving method of multiple antenna communication system |
| CN1956350A (en) * | 2005-10-25 | 2007-05-02 | 华为技术有限公司 | Multi-antenna transmitting system method of radio signal and radio communication system |
| CN1964218A (en) * | 2005-11-09 | 2007-05-16 | 华为技术有限公司 | A multi-antenna transmission system of wireless signal, method and wireless communication system |
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| WO2009092183A1 (en) | 2009-07-30 |
| CN101471755A (en) | 2009-07-01 |
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