CN114050888A - UW word assistance-based relay network asynchronous superposed signal recovery method and system - Google Patents
UW word assistance-based relay network asynchronous superposed signal recovery method and system Download PDFInfo
- Publication number
- CN114050888A CN114050888A CN202111326687.4A CN202111326687A CN114050888A CN 114050888 A CN114050888 A CN 114050888A CN 202111326687 A CN202111326687 A CN 202111326687A CN 114050888 A CN114050888 A CN 114050888A
- Authority
- CN
- China
- Prior art keywords
- sequence
- signal
- terminal node
- word
- superposed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000011084 recovery Methods 0.000 title claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 39
- 108010076504 Protein Sorting Signals Proteins 0.000 claims description 35
- 238000006243 chemical reaction Methods 0.000 claims description 29
- 230000003321 amplification Effects 0.000 claims description 13
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 6
- 108010074864 Factor XI Proteins 0.000 claims description 3
- 238000013507 mapping Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Images
Classifications
-
- 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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
- H04K1/02—Secret communication by adding a second signal to make the desired signal unintelligible
-
- 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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0033—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
A relay network asynchronous superposed signal recovery method and system based on UW word assistance belongs to the field of wireless communication signal processing. The invention solves the problem that when the relay node amplifies and forwards the received asynchronous superposed signal, the terminal can not separate the superposed signal, so that the useful signal can not be recovered. The invention can make each terminal node sequentially separate the asynchronous superposed signals received and forwarded by the relay in the second time slot, thereby realizing interference removal and useful signal recovery. When the terminal node processes the asynchronous superposed signal received by the second time slot, the data position of the signal transmitted by the terminal node in the first time slot is determined by using the UW word, then the signal is removed from the superposed signal, and finally the data position of the message signal to be recovered is found by using another UW word and the message signal is recovered. The invention can be applied to the field of wireless communication.
Description
Technical Field
The invention belongs to the field of wireless communication signal processing, and particularly relates to a relay network asynchronous superposed signal recovery method and system based on UW word assistance.
Background
The cooperative communication utilizes the broadcasting characteristic of the wireless network, so that the relay node in the network can help the terminal node to transmit information, and the effective utilization of communication resources is facilitated. The cooperation among the nodes in the relay network can effectively improve the spectrum efficiency of the system, improve the connectivity of the network and enhance the reliability of the system. In a relay network, relay forwarding protocols can be mainly classified into three types, namely amplify-forward, decode-forward and compress-forward. For amplify-and-forward, a relay node does not need to process a received signal, but simply amplifies and forwards its received signal to a terminal. The relayed signals are the result of the superposition of two terminal signals in the first time slot, and due to the problems of transmission delay, processing delay and the like, the superposed signals received by the terminal nodes are difficult to perfectly synchronize. This makes it difficult for each terminal node to find the location of the interference caused by the superimposed signal and the location of the useful signal, thereby removing the interference and recovering the useful signal.
In summary, when the relay node amplifies and forwards the received asynchronous superimposed signal, the terminal cannot separate the superimposed signal, and thus cannot recover the useful signal.
Disclosure of Invention
The invention aims to solve the problem that a useful signal cannot be recovered due to the fact that a terminal cannot separate a superposed signal when a relay node amplifies and forwards a received asynchronous superposed signal, and provides a relay network asynchronous superposed signal recovery method and system based on UW word assistance.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a relay network asynchronous superposed signal recovery method based on UW word assistance specifically comprises the following steps:
in the first time slot, the method for processing the transmission signal by the terminal node comprises the following steps:
step A1, terminal node A modulates the 0, 1 bit data generated by its own information source, and records the obtained modulation result as sequence xA；
Terminal node B pairModulating 0, 1 bit data generated by self source, recording obtained modulation result as sequence xB；
Step A2, terminal node A in sequence xAPre-appended UW word sequence uAObtaining a sequence d added with a UW word sequenceA；
Terminal node B in sequence xBPre-appended UW word sequence uBObtaining a sequence d added with a UW word sequenceB；
Step A3, terminal node A pair sequence dAProcessing and transmitting the processed signal to a channel; terminal node B pair sequence dBProcessing and transmitting the processed signal to a channel;
the method for processing the signal by the relay node comprises the following steps:
step B1, the relay node receives the superposed signal of the signals transmitted by the terminal node A and the terminal node B from the channel;
step B2, the relay node performs down-conversion processing on the superposed signal obtained in the step B1 to obtain a down-conversion processing result;
performing power amplification on the down-conversion processing result to obtain a signal after power amplification;
step B3, the relay node performs up-conversion processing on the power amplified signal obtained in the step B2 and transmits the up-converted signal to a channel;
in the second time slot, the method for processing the received signal by the terminal node comprises the following steps:
step C1, the terminal node A receives the signal transmitted to the channel in step B3, and processes the received signal, and records the obtained digital signal sequence as pA；
The terminal node B receives the signal transmitted to the channel in step B3, processes the received signal, and records the obtained digital signal sequence as pB；
Step C2, in sequence pAIn, terminal node A passes through UW word sequence uAFind the signal sequence dAAnd the sequence dAFrom pAIs removed to obtain a removal dAThe latter signal sequenceqA；
In the sequence pBIn, the terminal node B passes the UW word sequence uBFind the signal sequence dBAnd the sequence dBFrom pBIs removed to obtain a removal dBThe latter signal sequence qB；
Step C3, in sequence qAIn, the terminal node A is according to UW word sequence uBFind the signal sequence dBAt position and from the sequence qARemoving UW word sequence u fromBAfter that, a signal sequence y is obtainedB；
In the sequence qBIn, the terminal node B is based on the UW word sequence uAFind the signal sequence dAAt position and from the sequence qBRemoving UW word sequence u fromAPart of, obtaining a signal sequence yA；
Step C4, terminal node A pair signal sequence yBPerforming demapping to obtain 0 and 1 bit data; terminal node B to signal sequence yAAnd carrying out demapping to obtain 0 and 1 bit data.
Further, in the step a1, the modulation method is baseband mapping.
Further, in the step a3, the processing method is as follows:
terminal node A pair sequence dAD/A conversion and up-conversion are carried out in sequence, and terminal node B pairs sequence dBAnd performing digital/analog conversion and up-conversion in sequence.
Further, in the step B2, the power amplification is performed on the down-conversion processing result, and the value range of the power amplification factor ξ is
Wherein, P0Is the power of the received signal of the relay node, P1Is the power at which the relay node forwards the signal.
Further, in the step C1, the received signal is processed in the following manner:
the received signal is sequentially down-converted and analog/digital converted.
A relay network asynchronous superposed signal recovery system based on UW word assistance is used for executing a relay network asynchronous superposed signal recovery method based on UW word assistance.
The invention has the beneficial effects that:
the invention adds different UW words to the front end of the transmitting signal of each terminal node of the relay system in the first time slot, so that each terminal node can sequentially separate the asynchronous superposed signals received and forwarded by the relay in the second time slot, thereby realizing interference removal and useful signal recovery. When the terminal node processes the asynchronous superposed signal received by the second time slot, the data position of the signal transmitted by the terminal node in the first time slot is determined by using the UW word, then the signal is removed from the superposed signal, and finally the data position of the message signal to be recovered is found by using another UW word and the message signal is recovered. The method ensures that the relay node can still assist the terminal node to carry out two-way communication when directly amplifying and forwarding the incompletely synchronous superposed signals received by the first time slot, thereby greatly enhancing the practicability of the system.
Drawings
FIG. 1 is a schematic diagram of a system model of the present invention;
FIG. 2 is an overall flow chart of signal transmission according to the present invention;
fig. 3 is a schematic diagram illustrating a processing flow of a transmission signal by the first slot terminal node a;
fig. 4 is a schematic diagram illustrating a processing flow of a transmission signal by a first slot terminal node B;
fig. 5 is a schematic diagram of a processing flow of a received signal by the second timeslot end node a;
fig. 6 is a schematic diagram of a processing flow of a received signal by a second timeslot terminating node B.
Detailed Description
First embodiment this embodiment will be described with reference to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, and fig. 6. In this embodiment, a method for recovering an asynchronous superimposed signal of a relay network based on UW word assistance specifically includes the following steps:
in the first time slot, the method for processing the transmission signal by the terminal node comprises the following steps:
step A1, terminal node A modulates the 0, 1 bit data generated by its own information source, and records the obtained modulation result as sequence xA；
The terminal node B modulates the 0 and 1 bit data generated by the self information source, and records the obtained modulation result as a sequence xB；
Step A2, terminal node A in sequence xAPre-appended UW word sequence uAObtaining a sequence d added with a UW word sequenceA；
Terminal node B in sequence xBPre-appended UW word sequence uBObtaining a sequence d added with a UW word sequenceB；
Step A3, terminal node A pair sequence dAProcessing and transmitting the processed signal to a channel; terminal node B pair sequence dBProcessing and transmitting the processed signal to a channel;
the method for processing the signal by the relay node comprises the following steps:
step B1, the relay node receives the superposed signal of the signals transmitted by the terminal node A and the terminal node B from the channel;
step B2, the relay node performs down-conversion processing on the superposed signal obtained in the step B1 to obtain a down-conversion processing result;
performing power amplification on the down-conversion processing result to obtain a signal after power amplification;
step B3, the relay node performs up-conversion processing on the power amplified signal obtained in the step B2 and transmits the up-converted signal to a channel;
in the second time slot, the method for processing the received signal by the terminal node comprises the following steps:
step C1, the terminal node A receives the signal transmitted to the channel in step B3, and processes the received signal, and records the obtained digital signal sequence as pA；
The terminal node B receives the signal transmitted to the channel in step B3 and processes the received signalProcessing is carried out, and the obtained digital signal sequence is marked as pB；
Step C2, in sequence pAIn, terminal node A passes through UW word sequence uAFind the signal sequence dAAnd the sequence dAFrom pAIs removed to obtain a removal dAThe latter signal sequence qA；
In the sequence pBIn, the terminal node B passes the UW word sequence uBFind the signal sequence dBAnd the sequence dBFrom pBIs removed to obtain a removal dBThe latter signal sequence qB；
Step C3, in sequence qAIn, the terminal node A is according to UW word sequence uBFind the signal sequence dBAt position and from the sequence qARemoving UW word sequence u fromBAfter that, a signal sequence y is obtainedB；
In the sequence qBIn, the terminal node B is based on the UW word sequence uAFind the signal sequence dAAt position and from the sequence qBRemoving UW word sequence u fromAPart of, obtaining a signal sequence yA；
Step C4, terminal node A pair signal sequence yBPerforming demapping to obtain 0 and 1 bit data; terminal node B to signal sequence yAAnd carrying out demapping to obtain 0 and 1 bit data.
In this embodiment, the UW word should be a UW word with a relatively obvious autocorrelation characteristic, and for example, the UW word sequence may be a ZC sequence.
The invention solves the problem that the superposed signals received by the relay node are difficult to communicate when not synchronized, and the method ensures that the relay node can still assist the terminal node to carry out two-way communication when directly amplifying and forwarding the superposed signals which are not completely synchronized and received by the first time slot, thereby greatly enhancing the practicability of the system.
The second embodiment is as follows: the present embodiment is different from the first embodiment in that, in the step a1, the modulation method is baseband mapping.
Other steps and parameters are the same as those in the first embodiment.
The third concrete implementation mode: in this embodiment, different from the first or second embodiment, in the step a3, the processing mode is:
terminal node A pair sequence dAD/A conversion and up-conversion are carried out in sequence, and terminal node B pairs sequence dBAnd performing digital/analog conversion and up-conversion in sequence.
Other steps and parameters are the same as those in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment and one of the first to third embodiments is that, in the step B2, the power amplification is performed on the down-conversion processing result, and the value range of the power amplification factor ξ is
Wherein, P0Is the power of the received signal of the relay node, P1The power of the signal forwarded by the relay node, that is, the power of the signal after power amplification.
Other steps and parameters are the same as those in one of the first to third embodiments.
The fifth concrete implementation mode: in this embodiment, the difference from the first to the fourth embodiments is that, in the step C1, the received signal is processed in a manner that:
the received signal is sequentially down-converted and analog/digital converted.
That is, both the terminal node a and the terminal node B sequentially perform down-conversion and analog/digital conversion on the received signal.
Other steps and parameters are the same as in one of the first to fourth embodiments.
The sixth specific implementation mode: the system for recovering the asynchronous superposed signal of the relay network based on the UW word assist is used for executing a method for recovering the asynchronous superposed signal of the relay network based on the UW word assist.
The above-described calculation examples of the present invention are merely to explain the calculation model and the calculation flow of the present invention in detail, and are not intended to limit the embodiments of the present invention. It will be apparent to those skilled in the art that other variations and modifications of the present invention can be made based on the above description, and it is not intended to be exhaustive or to limit the invention to the precise form disclosed, and all such modifications and variations are possible and contemplated as falling within the scope of the invention.
Claims (6)
1. The method for restoring the asynchronous superposed signal of the relay network based on the UW word assistance is characterized by comprising the following steps:
in the first time slot, the method for processing the transmission signal by the terminal node comprises the following steps:
step A1, terminal node A modulates the 0, 1 bit data generated by its own information source, and records the obtained modulation result as sequence xA；
The terminal node B modulates the 0 and 1 bit data generated by the self information source, and records the obtained modulation result as a sequence xB；
Step A2, terminal node A in sequence xAPre-appended UW word sequence uAObtaining a sequence d added with a UW word sequenceA；
Terminal node B in sequence xBPre-appended UW word sequence uBObtaining a sequence d added with a UW word sequenceB；
Step A3, terminal node A pair sequence dAProcessing and transmitting the processed signal to a channel; terminal node B pair sequence dBProcessing and transmitting the processed signal to a channel;
the method for processing the signal by the relay node comprises the following steps:
step B1, the relay node receives the superposed signal of the signals transmitted by the terminal node A and the terminal node B from the channel;
step B2, the relay node performs down-conversion processing on the superposed signal obtained in the step B1 to obtain a down-conversion processing result;
performing power amplification on the down-conversion processing result to obtain a signal after power amplification;
step B3, the relay node performs up-conversion processing on the power amplified signal obtained in the step B2 and transmits the up-converted signal to a channel;
in the second time slot, the method for processing the received signal by the terminal node comprises the following steps:
step C1, the terminal node A receives the signal transmitted to the channel in step B3, and processes the received signal, and records the obtained digital signal sequence as pA；
The terminal node B receives the signal transmitted to the channel in step B3, processes the received signal, and records the obtained digital signal sequence as pB；
Step C2, in sequence pAIn, terminal node A passes through UW word sequence uAFind the signal sequence dAAnd the sequence dAFrom pAIs removed to obtain a removal dAThe latter signal sequence qA；
In the sequence pBIn, the terminal node B passes the UW word sequence uBFind the signal sequence dBAnd the sequence dBFrom pBIs removed to obtain a removal dBThe latter signal sequence qB；
Step C3, in sequence qAIn, the terminal node A is according to UW word sequence uBFind the signal sequence dBAt position and from the sequence qARemoving UW word sequence u fromBAfter that, a signal sequence y is obtainedB；
In the sequence qBIn, the terminal node B is based on the UW word sequence uAFind the signal sequence dAAt position and from the sequence qBRemoving UW word sequence u fromAPart of, obtaining a signal sequence yA；
Step C4, terminal node A pair signal sequence yBPerforming demapping to obtain 0 and 1 bit data; terminal node B to signal sequence yAAnd carrying out demapping to obtain 0 and 1 bit data.
2. The method for recovering an unsynchronized superposed signal of a relay network based on UW word assist as recited in claim 1, wherein in said step a1, the modulation mode is baseband mapping.
3. The method for recovering an unsynchronized superposition signal of a UW-word-assisted-based relay network according to claim 2, wherein in step a3, the processing is as follows:
terminal node A pair sequence dAD/A conversion and up-conversion are carried out in sequence, and terminal node B pairs sequence dBAnd performing digital/analog conversion and up-conversion in sequence.
4. The method for restoring the unsynchronized superposed signals of the relay network based on the UW word assist as recited in claim 3, wherein the power amplification is performed on the down-conversion processing result in step B2, and a value range of a power amplification factor ξ is
Wherein, P0Is the power of the received signal of the relay node, P1Is the power at which the relay node forwards the signal.
5. The method for recovering an unsynchronized superposed signal of a relay network based on UW word assist as recited in claim 4, wherein in said step C1, the received signal is processed in a manner that:
the received signal is sequentially down-converted and analog/digital converted.
6. UW word assist based relay network unsynchronized superposition signal recovery system, characterized in that said system is adapted to perform the UW word assist based relay network unsynchronized superposition signal recovery method according to any of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111326687.4A CN114050888B (en) | 2021-11-10 | 2021-11-10 | UW-assisted relay network asynchronous superposition signal recovery method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111326687.4A CN114050888B (en) | 2021-11-10 | 2021-11-10 | UW-assisted relay network asynchronous superposition signal recovery method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114050888A true CN114050888A (en) | 2022-02-15 |
| CN114050888B CN114050888B (en) | 2024-02-09 |
Family
ID=80207994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111326687.4A Active CN114050888B (en) | 2021-11-10 | 2021-11-10 | UW-assisted relay network asynchronous superposition signal recovery method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114050888B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1571296A (en) * | 2004-05-01 | 2005-01-26 | 中兴通讯股份有限公司 | A method of frame synchronization for wireless interface of time division communication system |
| CN101588339A (en) * | 2009-06-12 | 2009-11-25 | 北京邮电大学 | Method for reducing wireless relaying redundant forwarding on the basis of iterated code |
| CN103051427A (en) * | 2013-01-25 | 2013-04-17 | 西安电子科技大学 | Duplex wireless relay communication method based on network coding |
| KR101275852B1 (en) * | 2012-03-27 | 2013-06-17 | 연세대학교 산학협력단 | Method and apparatus for transmitting/receiving data based on sc-fde using uw |
-
2021
- 2021-11-10 CN CN202111326687.4A patent/CN114050888B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1571296A (en) * | 2004-05-01 | 2005-01-26 | 中兴通讯股份有限公司 | A method of frame synchronization for wireless interface of time division communication system |
| CN101588339A (en) * | 2009-06-12 | 2009-11-25 | 北京邮电大学 | Method for reducing wireless relaying redundant forwarding on the basis of iterated code |
| KR101275852B1 (en) * | 2012-03-27 | 2013-06-17 | 연세대학교 산학협력단 | Method and apparatus for transmitting/receiving data based on sc-fde using uw |
| CN103051427A (en) * | 2013-01-25 | 2013-04-17 | 西安电子科技大学 | Duplex wireless relay communication method based on network coding |
Non-Patent Citations (1)
| Title |
|---|
| 刘珩;安建平;: "UWB Ad Hoc网络无线接入特性与定位辅助路由分析", 南京邮电大学学报(自然科学版), no. 02 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114050888B (en) | 2024-02-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3224541B2 (en) | Data signal multiplexing method and apparatus | |
| WO2005091557A3 (en) | Wlan capacity enhancement by contention resolution | |
| CN106131919B (en) | A kind of synchronous method of non-stop layer self-organized network topology | |
| CN109195169B (en) | Cognitive eavesdropping network physical layer secure transmission method based on energy acquisition technology | |
| JP5171291B2 (en) | Wireless transmission method, wireless transmission device, and wireless reception device | |
| CN105827551A (en) | Method and system for estimating modulation index and frequency offset | |
| CN105516997A (en) | Physical layer safe cognition relay communication method | |
| KR101074122B1 (en) | Satellite communication transmitter and receiver for mitigating channel interference | |
| CN114050888A (en) | UW word assistance-based relay network asynchronous superposed signal recovery method and system | |
| JP2009177341A (en) | Radio receiver, and radio reception method | |
| CN111371711A (en) | Fast acquisition and synchronization method of wireless burst communication system | |
| CN107682294A (en) | A kind of phase ambiguity bearing calibration of the high speed 16apsk signals based on FPGA | |
| EP2760173B1 (en) | Data transmission method, device and system | |
| CN102547581B (en) | Intra-network data interaction method and system of Internet of things | |
| CN106788663A (en) | A kind of satellite modem of spectrum overlapping | |
| CN103491624A (en) | Time synchronization method of event time labels in sensor network | |
| CN104883240A (en) | Time division broadcasting protocol combining differential multiplication forwarding and selective combination | |
| CN102857323A (en) | Amplification and transmission coordination based network coding method | |
| JP2002009655A (en) | Two-way wireless communication system and two-way wireless communication method | |
| CN105490721A (en) | Estimate-forward method of full-duplex transportation cooperative-communication network | |
| WO2008058439A1 (en) | A method and system for converting the data sample rate in the baseband signal transmission | |
| CN109951266B (en) | Full-duplex bidirectional relay method based on QAM modulation | |
| CN100469071C (en) | Sideband information transmitting and frame synchronizing method and apparatus in OFDM communication system | |
| CN101917250B (en) | Communication method for bilateral relay network | |
| JPH08279832A (en) | Signal restoration method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |