CN103095626A - Switching method of modulation-demodulation operating modes - Google Patents
Switching method of modulation-demodulation operating modes Download PDFInfo
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- CN103095626A CN103095626A CN2011103339396A CN201110333939A CN103095626A CN 103095626 A CN103095626 A CN 103095626A CN 2011103339396 A CN2011103339396 A CN 2011103339396A CN 201110333939 A CN201110333939 A CN 201110333939A CN 103095626 A CN103095626 A CN 103095626A
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Abstract
The invention provides a switching method of modulation-demodulation operating modes. The method is mainly used in a radio frequency receiving section in an up channel, energy of each frame of received data information is detected, energy value is compared with preset threshold value, and therefore if a switching command of the modulation-demodulation operating modes is sent to a modulator of a baseband emission section and a demodulator of a baseband receiving section is judged, once the modulator and the demodulator receive the switching command, determined work mode is switched automatically, and when the switching command is not received, the current work mode is not changed. Therefore, the effect that the most appropriate modulation-demodulation work mode is selected under the condition of different channels is achieved, fault tolerance is guaranteed, and spectrum utilization rate is further improved at the same time.
Description
Technical field
The present invention relates to a kind of modulation /demodulation Working mode switching method that is applied in communication system, particularly relate to a kind of changing method that is applied in the modulation /demodulation mode of operation in ofdm system.
Background technology
Develop rapidly along with mobile communication technology, a kind of as in multi-carrier modulation technology of OFDM, each subcarrier is mutually orthogonal has plurality of advantages such as anti-arrowband disturbs and the frequency selective fading ability is strong, band efficiency is high because it satisfies, therefore more and more come into one's own, and become the focus of people research, be widely used in military and the numerous areas such as communicate by letter, and be considered to one of very important key technology in the 4th third-generation mobile communication.
What present communication system base band and radio frequency part generally adopted is the fixing mode of operation of modulation /demodulation, and the benefit of processing like this is that the complexity of system is not high, and the communication mode of system is also fairly simple, and only needs the mode of one-way communication to get final product.
by the operation principles of modulation /demodulation as can be known, its antijamming capability and the availability of frequency spectrum are the conflict bodies, and, in real world applications, because the situation of channel is can be along with the difference of weather and the variation of surrounding environment change, can occur fine sometimes, and sometimes can very abominable situation, in the situation that bad channel, to antijamming capability, that is fault freedom requires higher, if the modulation /demodulation mode of operation that adopt this moment is the high pattern of the availability of frequency spectrum, corresponding antijamming capability is just weak, namely can affect the accuracy of data information transfer, and at channel preferably in situation, if the modulation /demodulation mode of operation that adopt this moment is the pattern of zmodem, corresponding efficiency of transmission is just low.
Obviously, adopt fixing modulation /demodulation mode of operation can't comply with the channel conditions that is always changing in the actual data transfer process, and reach the effect that further improves the utilance of frequency spectrum when guaranteeing fault-tolerance.Therefore, be necessary to provide a kind of method of can be adaptively selected according to the situation of current channel suitable modulation /demodulation mode of operation, to make up the deficiency that adopts fixing modulation /demodulation mode of operation to be brought.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of changing method of modulation /demodulation mode of operation, with suitable modulation /demodulation mode of operation adaptively selected according to current channel conditions, and make up the deficiency that adopts fixing modulation /demodulation mode of operation to bring.
For achieving the above object, the invention provides a kind of changing method of modulation /demodulation mode of operation, be applied in ofdm system, wherein, this ofdm system comprises baseband transmission section, radio-frequency transmissions section, radio frequency reception section and the base band receiver section between transmitting terminal and receiving terminal, and this baseband transmission section comprises modulator at least, this base band receiver section comprises demodulator at least, it is characterized in that, the changing method of this modulation /demodulation mode of operation comprises: 1) in this radio frequency reception section, constantly detect the energy of a current frame of data information that receives at up channel; 2) in this radio frequency reception section, whether judge the energy that detects greater than a predetermined threshold value, if, determine that current optimal mode of operation is first mode, and proceed to step 3), if not, determine that current optimal mode of operation is the second pattern, and proceed to step 4); 3) in this radio frequency reception section, judge whether the current mode of operation of modulation /demodulation is determined first mode, if not, wait until that the moment of down channel arrival is simultaneously to modulator and demodulator transmission switching command, and the work at present pattern is switched to determined first mode, if keep the work at present pattern, and be back to step 1); And 4) in this radio frequency reception section, judge whether the current mode of operation of modulation /demodulation is determined the second pattern, if not, wait until that the moment of down channel arrival is simultaneously to modulator and demodulator transmission switching command, and the work at present pattern is switched to determined the second pattern, if keep the work at present pattern, and be back to step 1).
In addition, this ofdm system also comprises the power control module that is arranged on the radio frequency reception section, and the changing method of this modulation /demodulation mode of operation is to be achieved by this power control module.That a long time slot under the half-duplex operation mode adds two time slot link structures of gap in short-term and this ofdm system adopts, wherein, this long time slot is worked constantly at up channel, take a frame of data information as a unit, transmit a frame of data information to receiving terminal, and gap is worked constantly at down channel in short-term, in order to be responsible for above-mentioned steps 3) or 4) the transmission work of mode of operation switching command.
Preferably, this first mode is the QAM pattern, and this second pattern is the QPSK pattern.
as mentioned above, the changing method of modulation /demodulation mode of operation of the present invention is mainly that the power control module by the radio frequency reception section detects the energy of each frame of data information of receiving, and this energy value is compared with a default threshold value, result in conjunction with energy comparison, decision is constantly interim at current down channel, whether need to select to transmit the switching command of modulation /demodulation mode of operation to the modulator of baseband transmission section and the demodulator of base band receiver section, in case this modulator and demodulator receives switching command, automatically switch into determined mode of operation, otherwise it is constant to keep existing mode of operation.So, to realize selecting the most suitable modulation /demodulation mode of operation under different channel situation, further improve the utilance of frequency spectrum when guaranteeing fault-tolerance.
Description of drawings
Fig. 1 is shown as the operational flowchart of the changing method of modulation /demodulation mode of operation of the present invention.
Fig. 2 is shown as the structural representation of the applied ofdm system of changing method of modulation /demodulation mode of operation of the present invention.
The element numbers explanation
1 transmitting terminal
2 receiving terminals
31 baseband transmission sections
311 modulators
32 radio-frequency transmissions sections
33 radio frequency reception sections
331 power control modules
34 base band receiver sections
341 demodulators
The a up channel
The b down channel
The S10-S80 step
Embodiment
Below by specific instantiation explanation embodiments of the present invention, those skilled in the art can understand other advantages of the present invention and effect easily by the disclosed content of this specification.
Seeing also Fig. 1, is the operational flowchart that shows the changing method of modulation /demodulation mode of operation of the present invention.The changing method of modulation /demodulation mode of operation of the present invention is to be applied in ofdm system, below namely coordinates Fig. 2 that the changing method of modulation /demodulation mode of operation of the present invention is elaborated.
As shown in Figure 2, this ofdm system comprises baseband transmission section 31, radio-frequency transmissions section 32, radio frequency reception section 33 and the base band receiver section 34 between transmitting terminal 1 and receiving terminal 2, and this baseband transmission section 31 comprises modulator 311 at least, this base band receiver section 34 comprises demodulator 341 at least, this radio frequency reception section 33 comprises power control module 331 at least, and the changing method of modulation /demodulation mode of operation of the present invention mainly is achieved by this power control module 331; In addition, this ofdm system adopts is that a long time slot under the half-duplex operation mode adds two time slot link structures of gap in short-term, this long time slot is worked constantly at up channel a, take a frame of data information as a unit, transmit a frame of data information to receiving terminal 2, and gap is worked constantly at down channel b in short-term, in order to be responsible for transmitting the mode of operation switching command to modulator and demodulator, switch to suitable mode of operation with corresponding, for the transmission of next frame data message provides better channel circumstance.What need be explained is herein, the technology that is well known to those skilled in the art due to the internal structure of ofdm system, therefore, just list the expressivity ground explanation element relevant with the present invention in this, so that explanation of the present invention is more short and sweet, close first Chen Ming.
As shown in Figure 1, at first execution in step S10, in this radio frequency reception section 33, detect the energy of a current frame of data information that receives constantly at up channel a.Then, carry out step S20.
In step S20, in this radio frequency reception section 33, whether judge the energy that detects greater than a predetermined threshold value, if, illustrate that current channel situation is better, and proceed to step S30, if not, illustrate that current channel situation is relatively poor, and proceed to step S60.Need to prove herein, this threshold value be by to the existing communication system in the situation that repeatedly test the parameter value that obtains without the error rate.
In step S30, determine that current optimal mode of operation is first mode, this first mode is the high modulation /demodulation mode of operation of the availability of frequency spectrum, in the present embodiment, this first mode is QAM (quadrature amplitude modulation) pattern, but not as limit, this first mode also can be other mode of operations that possess the high characteristic of frequency efficiency, with when channel is better, improve the efficiency of transmission of signal.Then, carry out step S40.
In step S40, judge whether the current mode of operation of modulation /demodulation is determined first mode, if not, proceeds to step S50, if, keep the work at present pattern, and be back to step S10, the energy of next frame data message is proceeded judgement.
In step S50, the moment of down channel b arrival is by the time transmitted switching commands to modulator 311 and demodulator 341 simultaneously, and the work at present pattern is switched to determined first mode.Then, be back to step S10, the energy of next frame data message is proceeded judgement.
In step S60, determine that current optimal mode of operation is the second pattern, this second pattern is the good modulation /demodulation mode of operation of fault freedom, in the present embodiment, this first mode is QPSK (quarternary phase-shift keying (QPSK)) pattern, but not as limit, this second pattern also can be other mode of operations that possess the good characteristic of fault freedom, with when channel is relatively poor, the guarantee information transmission has accuracy preferably.Then, carry out step S70.
In step S70, judge whether the current mode of operation of modulation /demodulation is determined the second pattern, if not, proceeds to step S80, if, keep the work at present pattern, and return to step S10, the energy of next frame data message is proceeded judgement.
In step S80, the moment of down channel b arrival is by the time transmitted switching commands to modulator 311 and demodulator 341 simultaneously, and the work at present pattern is switched to determined the second pattern, and return to step S10, the energy of next frame data message is proceeded judgement.
In sum, the changing method of modulation /demodulation mode of operation of the present invention is mainly as a unit with a frame of data information, each frame of data information is reached the power control module place of radio frequency reception section, according to it, energy size that frame of data information detects is judged current channel conditions, thereby select corresponding modulation /demodulation mode of operation to process, so, can be when guaranteeing fault-tolerance (being accuracy), further improve the efficiency of transmission of signal, thereby reach the effect that improves systematic function, have stronger practical value.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not is used for restriction the present invention.Any person skilled in the art scholar all can under spirit of the present invention and category, modify or change above-described embodiment.Therefore, have in technical field under such as and know that usually the knowledgeable modifies or changes not breaking away from all equivalences of completing under disclosed spirit and technological thought, must be contained by claims of the present invention.
Claims (6)
1. the changing method of a modulation /demodulation mode of operation, be applied in ofdm system, wherein, this ofdm system comprises baseband transmission section, radio-frequency transmissions section, radio frequency reception section and the base band receiver section between transmitting terminal and receiving terminal, and described baseband transmission section comprises modulator at least, described base band receiver section comprises demodulator at least, it is characterized in that, the changing method of described modulation /demodulation mode of operation comprises:
1) in described radio frequency reception section, constantly detect the energy of a current frame of data information that receives at up channel;
2) in described radio frequency reception section, whether judge the energy that detects greater than a predetermined threshold value, if, determine that current optimal mode of operation is first mode, and proceed to step 3), if not, determine that current optimal mode of operation is the second pattern, and proceed to step 4);
3) in described radio frequency reception section, judge whether the current mode of operation of modulation /demodulation is determined first mode, if not, wait until that the moment of down channel arrival is simultaneously to modulator and demodulator transmission switching command, and the work at present pattern is switched to determined first mode, if keep the work at present pattern, and be back to step 1); And
4) in described radio frequency reception section, judge whether the current mode of operation of modulation /demodulation is determined the second pattern, if not, wait until that the moment of down channel arrival is simultaneously to modulator and demodulator transmission switching command, and the work at present pattern is switched to determined the second pattern, if keep the work at present pattern, and be back to step 1).
2. the changing method of modulation /demodulation mode of operation according to claim 1, it is characterized in that: described ofdm system also comprises the power control module that is arranged on the radio frequency reception section, and the changing method of described modulation /demodulation mode of operation is to be achieved by described power control module.
3. the changing method of modulation /demodulation mode of operation according to claim 1 and 2 is characterized in that: described ofdm system adopts is that a long time slot under the half-duplex operation mode adds two time slot link structures of gap in short-term.
4. the changing method of modulation /demodulation mode of operation according to claim 3, it is characterized in that: described long time slot is worked constantly at up channel, take a frame of data information as a unit, transmit a frame of data information to receiving terminal, and gap is worked constantly at down channel in short-term, in order to be responsible for above-mentioned steps 3) or 4) the transmission work of mode of operation switching command.
5. the changing method of modulation /demodulation mode of operation according to claim 1, it is characterized in that: described first mode is the QAM pattern.
6. the changing method of modulation /demodulation mode of operation according to claim 1, it is characterized in that: described the second pattern is the QPSK pattern.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105162540A (en) * | 2015-07-29 | 2015-12-16 | 深圳市华信天线技术有限公司 | Wireless data transmission radio |
| CN105871506A (en) * | 2016-03-23 | 2016-08-17 | 中国电子科技集团公司第十研究所 | Wireless communication adaptive transmission method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1667986A (en) * | 2004-03-08 | 2005-09-14 | 信息技术实验室 | Adaptive modulation-demodulation control device and method |
| CN101106555A (en) * | 2006-07-14 | 2008-01-16 | 鸿富锦精密工业（深圳）有限公司 | Modem and its operation mode and switching method |
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- 2011-10-28 CN CN2011103339396A patent/CN103095626A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1667986A (en) * | 2004-03-08 | 2005-09-14 | 信息技术实验室 | Adaptive modulation-demodulation control device and method |
| CN101106555A (en) * | 2006-07-14 | 2008-01-16 | 鸿富锦精密工业（深圳）有限公司 | Modem and its operation mode and switching method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105162540A (en) * | 2015-07-29 | 2015-12-16 | 深圳市华信天线技术有限公司 | Wireless data transmission radio |
| CN105162540B (en) * | 2015-07-29 | 2018-12-11 | 深圳市华信天线技术有限公司 | Wireless digital broadcasting station |
| CN105871506A (en) * | 2016-03-23 | 2016-08-17 | 中国电子科技集团公司第十研究所 | Wireless communication adaptive transmission method |
| CN105871506B (en) * | 2016-03-23 | 2019-01-11 | 中国电子科技集团公司第十研究所 | Wirelessly communicate adaptive transmission method |
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Application publication date: 20130508 |