CN103338064A - Pre-channel smart antenna multiple-input-multiple-output (MIMO) transmitting device and wireless signal transmitting method - Google Patents
Pre-channel smart antenna multiple-input-multiple-output (MIMO) transmitting device and wireless signal transmitting method Download PDFInfo
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Abstract
The invention relates to the communication technical filed. The invention provides a pre-channel smart antenna multiple-input-multiple-output (MIMO) transmitting device and a wireless signal transmitting method. Transmitted wave beams of an existing smart antenna can only transmit one channel of data streams every time, while, with the pre-channel smart antenna multiple-input-multiple-output (MIMO) transmitting device and the wireless signal transmitting method provided by the invention adopted, the above problem can be solved. The pre-channel smart antenna multiple-input-multiple-output (MIMO) transmitting device comprises a plurality of paths of signal transmitting branches and an adder, wherein each path of signal transmitting branch comprises a complex weighting module, a modulator and an antenna; the pre-channel smart antenna multiple-input-multiple-output (MIMO) transmitting device further comprises a plurality of paths of signal input ends and input complex weighting modules of which the number is corresponding to that of the signal input ends, wherein each path of signal input end is respectively connected with one input complex weighting module corresponding to the signal input end, each input complex weighting module is connected with the adder; and the adder is connected with all the signal transmitting branches. The pre-channel smart antenna multiple-input-multiple-output (MIMO) transmitting device and the wireless signal transmitting method of the invention are advantageous in improvement of data transmission rate and suitability for data transmission systems.
Description
Technical field
The present invention relates to the communication technology, particularly smart antenna and MIMO Radio Transmission Technology.
Background technology
Existing smart antenna using aerial array produces directional beam at transmitting terminal makes signal energy concentrate on specific direction transmission, thereby the signal to noise ratio that receives signal is increased substantially, and can obviously improve the performance of wireless communication system.Fig. 1 is a kind of system block diagram with existing antenna system of launching beam, in this system, and transmitting terminal configuration n root antenna, the signal of input or data flow x are by the different weight w that is added with
0, w
1..., w
N-1After enter modulator, produce the radiofrequency signal of the same carrier frequency in n road altogether, launch simultaneously through n antenna then, wherein, n is the positive integer more than or equal to 2.
Be added with weight w
0, w
1..., w
N-1The combination of suitable value can form the launching beam of an orientation, make the signal of input or data flow x along a specific direction transmission, therefore can make signal transmission range under same power farther; The signal to noise ratio of receiving terminal is higher under same transmission range.
Receiving terminal can be a common single antenna receiver, also can be an aerial array receiver, and receiving terminal shown in Figure 1 is an aerial array receiver, disposes k root reception antenna altogether, is the single antenna receiver when k=1.The signal that receives is reduced to baseband signal after demodulation, baseband signal just obtains exporting y after optimizing merging and Base-Band Processing, and it is the estimated value of transmitting terminal data flow x
, namely
Here, optimizing the major function that merges is reasonably to superpose from useful signal each road antenna and that experienced different channels, to obtain maximum output signal-to-noise ratio.Because the technology of the present invention mainly is the improvement to transmitting terminal, therefore the situation to receiving terminal no longer elaborates.
But in the above-mentioned intelligent antenna technology, each launching beam need be added with weights by n and realize, launching beam at one time only can transmission of one line baseband signal or data flow, and the utilance of wave beam is lower, and this is the shortcoming that existing intelligent antenna technology exists.
Existing MIMO(multiple-input and multiple-output) technology is utilized the formed different radio channel of different spatial parallel transmission multiple signals or the data flow of many antennas of transmitting terminal and receiving terminal, can increase substantially data transmission rate and the throughput of wireless communication system, it is an important development of Modern wireless communication technology, in the communications field, produced great influence, be with a wide range of applications.Figure 2 shows that the system block diagram of existing mimo wireless communication system, transmitting terminal comprises n road signal transmitting terminal and n the signal input part corresponding with the signal transmitting terminal, each road signal transmitting terminal comprises a modulator and an antenna (ignoring power amplifier and encoder here), the baseband signal of signal input part input is transferred to antenna and sends after modulators modulate, transmitting terminal has n road input base-band data stream x
0, x
1... .., x
N-1And n transmit antennas (n is positive integer), x
m∈ ± 1} (m=0,1 ..., n-1), every circuit-switched data stream x
mAfter rf modulations, become the high-frequency signal of same carrier frequency, again by corresponding antenna Ant.m (m=0,1 ..., n-1) launch; Receiving terminal comprises k root antenna, k demodulator (ignoring low noise amplifier here), a baseband signal processing module and n signal output part, every antenna connects one to one with a demodulator respectively, each demodulator all is connected with baseband signal processing module, baseband signal processing module is connected with n signal output part, receiving terminal disposes k root reception antenna (k=1,2,), the radiofrequency signal of every antenna obtains baseband signal behind demodulator, baseband signal processing module is optimized merging to the k roadbed band signal from different antennae, detect, processing such as judgement obtain n road output stream y at last
0, y
1, y
N-1, y
m∈ ± 1} (m=0,1 ..., n-1), y
mNamely be transmitting terminal input traffic x
mEstimated value
,
And being analyzed as follows at the baseband signal processing module course of work: the channel of establishing between m transmit antennas and the l root reception antenna is h
Ml, then the signal on the l root reception antenna is
B in the formula
kIt is the white Gaussian noise of k root reception antenna.In order to detect data x
i, can adopt maximum signal to noise ratio merging method at receiving terminal.
Receiving terminal can estimate each channel h
Ml, the signal merging of each reception antenna can be obtained judgment variables accordingly, namely
If Q (.) is decision function, Q (.) ∈ { ± 1}.Then have
Here, the real number operation is got in Re (.) expression.In formula (4), the useful signal component of first representative of consumer; Second and third Xiang Ze representative needs only these interference and noise is controlled in certain scope from the interference of other subscriber signal and the noise of each antenna, the data flow that detects each user's transmission that receiving terminal just can be correct.
Because transmitting terminal has adopted many antennas parallel transmission, system can improve data transmission rate n doubly under the situation that does not increase frequency bandwidth, or increase amount amount n doubly, therefore power system capacity and spectrum efficiency have also just improved greatly, but data transmission rate improves more manyly or number of users increases more manyly, the quantity of transmitting antenna will increase more many, and in actual applications, the increase of number of transmission antennas often is subjected to the restriction of factors such as cost, space scale again, and this has just directly limited the raising degree of systematic function.In addition, the performance of existing mimo wireless communication system depends on the correlation between the transmission channel, when stronger correlation occurring between the different transmission channels, the performance of whole M IMO system will obviously descend, and in existing system, the correlation of interchannel then depends on natural environment and the various enchancement factor of communication, often can't change, so the performance of mimo system rare arriving with assurance in real world applications.
Summary of the invention
The launching beam that the objective of the invention is to overcome present smart antenna once only can the transmission of one line data flow defective, make a wave beam can transmit multichannel baseband signal or data flow simultaneously at one time, realize the fusion mode of a kind of smart antenna and MIMO technology, make system have the double dominant of smart antenna and MIMO technology.
The present invention solves its technical problem, and a kind of pre-channel smart antenna MIMO emitter and wireless signal transmitting method are provided.
The technical scheme that adopts is, pre-channel smart antenna MIMO emitter, comprise the multiple signals transmitting branch, each road signal transmitting branch comprises a complex weighting module, a modulator and an antenna, it is characterized in that, also comprise an adder, multiple signals input and the input complex weighting module corresponding with signal input part quantity, each road signal input part all is connected with an input complex weighting module corresponding with it respectively, each input complex weighting module is connected with an adder, and adder is connected with all signal transmitting branches;
Described input complex weighting module is used for the baseband signal of signal input part input is carried out the complex weighting operation, is transferred to adder then;
Being transferred to each road signal transmitting branch after baseband signal behind the complex weighting that described adder is used for all input complex weighting modules are exported merges sends.
Concrete, described input complex weighting module is carried out the complex weighting operation to the baseband signal of signal input part input: input complex weighting module is added with weights or is added with weights according to what feedback information was dynamically adjusted according to default, perhaps according to the weights that are added with by the programming mode adjustment baseband signal of signal input part input is carried out the complex weighting operation.
Pre-channel smart antenna MIMO wireless signal transmitting method is characterized in that, comprises the steps:
Signal input part in step 1, the pre-channel smart antenna MIMO emitter receives the baseband signal of input, and the input complex weighting module that this baseband signal is sent to its correspondence carries out sending adder again to after the complex weighting operation;
Baseband signal behind the complex weighting that step 2, adder send its all respective signal inputs that receive merges, and the signal after pre-channel smart antenna MIMO emitter will merge is handled the back transmission as transmitting signal.
Concrete, in the step 1, described input complex weighting module is carried out the complex weighting method of operating and is: input complex weighting module is carried out the complex weighting operation according to the default weights that are added with to the baseband signal of signal input part input.
Further, in the step 1, described input complex weighting module is carried out the complex weighting method of operating and is: input complex weighting module according to circumstances or according to the weights that are added with that feedback information is dynamically adjusted is carried out the complex weighting operation to the baseband signal of signal input part input.
Concrete, in the step 1, described input complex weighting module is carried out the complex weighting method of operating and is: input complex weighting module is carried out the complex weighting operation according to the weights that are added with by the programming mode adjustment to the baseband signal of signal input part input.
Further, in the step 2, described being treated to carried out the complex weighting operation earlier, and then carries out rf modulations.
The invention has the beneficial effects as follows, in the present invention program, by above-mentioned pre-channel smart antenna MIMO emitter and wireless signal transmitting method, it adopts and presets channel method increases transmission channel in the launching beam in antenna system quantity, broken through the traditional intelligence antenna mode of beam signal single channel transmission, make a launching beam under same carrier frequency and bandwidth condition, can transmit multichannel baseband signal or data flow simultaneously, namely with wave beam multichannel parallel transmission mode mimo system and antenna system are blended in one effectively, the wave beam directional transmissions function that makes system can bring into play smart antenna can be brought into play the multichannel parallel signal transfer function of mimo system again simultaneously, double dominant with smart antenna and MIMO technology, and transmission channel has controllability, therefore the characterisitic parameter of channel can guarantee and improve the performance of system to a great extent according to communication environment setting and dynamically adjustment.Compared with prior art, the present invention combines the different advantages of intelligent antenna technology and MIMO technology, can also increase the penetrability etc. that the transmission range of signal, the noise that strengthens signal when improve signal when improving spectrum efficiency, increase power system capacity and improving data transmission rate; Or when the noise that increases the transmission range of signal, strengthen signal when improves the penetrability of signal, also improve spectrum efficiency, increase power system capacity and improve data transmission rate.
Description of drawings
Fig. 1 is existing system block diagram with existing antenna system of launching beam.
Fig. 2 is the system block diagram of existing mimo wireless communication system.
Fig. 3 is the system block diagram of the pre-channel smart antenna of the present invention MIMO emitter.
Embodiment
Below in conjunction with embodiment and accompanying drawing, describe technical scheme of the present invention in detail.
System block diagram such as Fig. 3 of pre-channel smart antenna MIMO emitter of the present invention.Pre-channel smart antenna MIMO emitter of the present invention, comprise multiple signals transmitting branch and an adder, each road signal transmitting branch comprises a complex weighting module, a modulator and an antenna, also comprise an adder, multiple signals input and the input complex weighting module corresponding with signal input part quantity, each road signal input part all is connected with an input complex weighting module corresponding with it respectively, each input complex weighting module is connected with an adder, and adder is connected with all signal transmitting branches.Here, input complex weighting module is used for the baseband signal of signal input part input is carried out the complex weighting operation, so that favourable transmission channel characteristic to be set as required, then the baseband signal behind the complex weighting is transferred to adder; Adder sends for being transferred to each road signal transmitting branch after the baseband signal behind all complex weightings is merged.At each road signal transmitting branch, the baseband signal behind the complex weighting, is sent into modulator then and is carried out rf modulations to determine the direction of intelligent antenna beam through complex weighting operation again, and the radio frequency output after modulator will be modulated is again launched by antenna.
In the pre-channel smart antenna MIMO wireless signal transmitting method of the present invention, after the signal input part in the pre-channel smart antenna MIMO emitter receives the baseband signal of input, the input complex weighting module that this baseband signal is sent to its correspondence carries out sending adder again to after the complex weighting operation, baseband signal behind adder the complex weighting that its all respective signal inputs that receive are sent merges then, and the signal after pre-channel smart antenna MIMO emitter will merge is at last handled the back transmission as transmitting signal.
Embodiment
System block diagram such as Fig. 3 of the pre-channel smart antenna MIMO emitter of the embodiment of the invention.The pre-channel smart antenna MIMO emitter of this example comprises the multiple signals transmitting branch, and each road signal transmitting branch comprises a complex weighting module, a modulator and an antenna; Also comprise an adder, multiple signals input and the input complex weighting module corresponding with signal input part quantity, each road signal input part all is connected with an input complex weighting module corresponding with it respectively, each input complex weighting module is connected with an adder, and adder is connected with all signal transmitting branches.Here, input complex weighting module is used for the baseband signal of signal input part input is carried out the complex weighting operation according to the weights that are added with default or that otherwise determine, comprise according to default and be added with weights or be added with weights according to what feedback information was dynamically adjusted, perhaps according to the weights that are added with by the programming mode adjustment baseband signal of signal input part input is carried out the complex weighting operation, so that favourable transmission channel characteristic to be set as required, then the baseband signal behind the complex weighting is transferred to adder; Being transferred to each road signal transmitting branch after baseband signal behind the complex weighting that adder is used for all complex weighting modules are sent merges sends.
During use, after the signal input part in the pre-channel smart antenna MIMO emitter receives the baseband signal of input, the input complex weighting module that this baseband signal is sent to its correspondence carries out sending adder again to after the complex weighting operation, here, input complex weighting module is carried out the complex weighting method of operating and is: input complex weighting module is added with weights or is added with weights according to what feedback information was dynamically adjusted according to default, perhaps according to the weights that are added with by the programming mode adjustment baseband signal of signal input part input is carried out the complex weighting operation, the baseband signal behind adder the complex weighting that its all respective signal inputs that receive are sent merges then; Signal after pre-channel smart antenna MIMO emitter will merge is at last handled the back transmission as transmitting signal, it specifically comprises: will carry out the complex weighting operation again by the complex weighting module of each road signal transmitting branch as the signal after the merging that transmits signal, to determine the direction of intelligent antenna beam, the modulator that enters then in each road signal transmitting branch is separately modulated, produce the radiofrequency signal of the same carrier frequency of multichannel, each antenna in each road signal transmitting branch is launched simultaneously then.
In addition, input complex weighting module can replace with filter, to realize channel equalization, resists the influence of wireless multipath channel.
Specifically illustrate as follows: establish the total n road of this pre-channel smart antenna MIMO emitter signal transmitting branch, each road signal transmitting branch comprises a complex weighting module, a modulator and an antenna, wherein, and n=1,2 Also comprise k road signal input part, k input complex weighting module and an adder, each road signal input part all is connected with an input complex weighting module corresponding with it respectively, each input complex weighting module is connected with an adder, adder is connected with all signal transmitting branches, wherein, k=1,2 ... during use, if k signal input part all receives the baseband signal of input, then by connected input complex weighting module the baseband signal of input is carried out the complex weighting operation respectively, so that favourable transmission channel characteristic to be set as required, again the baseband signal behind the complex weighting is sent to adder.Baseband signal behind all complex weightings that adder will receive merges the back and carries out the complex weighting operation again as the complex weighting module that the transmission signal sends in the signal transmitting branch of n road, to determine the direction of intelligent antenna beam; The modulator that n road signal after complex weighting operation enters respectively in each road signal transmitting branch is separately then modulated, and produces the radiofrequency signal of the same carrier frequency in n road, and each antenna in each road signal transmitting branch is launched simultaneously then.In this example, input complex weighting module can replace with filter.
Claims (8)
1. pre-channel smart antenna MIMO emitter, comprise the multiple signals transmitting branch, each road signal transmitting branch comprises a complex weighting module, a modulator and an antenna, it is characterized in that, also comprise an adder, multiple signals input and the input complex weighting module corresponding with signal input part quantity, each road signal input part all is connected with an input complex weighting module corresponding with it respectively, each input complex weighting module is connected with an adder, and adder is connected with all signal transmitting branches;
Described input complex weighting module is used for the baseband signal of signal input part input is carried out the complex weighting operation, is transferred to adder then;
Being transferred to each road signal transmitting branch after baseband signal behind the complex weighting that described adder is used for all input complex weighting modules are exported merges sends.
2. pre-channel smart antenna MIMO emitter as claimed in claim 1, it is characterized in that, described input complex weighting module is carried out the complex weighting operation to the baseband signal of signal input part input: input complex weighting module is added with weights or is added with weights according to what feedback information was dynamically adjusted according to default, perhaps according to the weights that are added with by the programming mode adjustment baseband signal of signal input part input is carried out the complex weighting operation.
3. pre-channel smart antenna MIMO wireless signal transmitting method is characterized in that, comprises the steps:
Signal input part in step 1, the pre-channel smart antenna MIMO emitter receives the baseband signal of input, and the input complex weighting module that this baseband signal is sent to its correspondence carries out sending adder again to after the complex weighting operation;
Baseband signal behind the complex weighting that step 2, adder send its all respective signal inputs that receive merges, and sends all signal transmitting branches then to and handles the back and send.
4. pre-channel smart antenna MIMO wireless signal transmitting method as claimed in claim 3, it is characterized in that, in the step 1, described input complex weighting module is carried out the complex weighting method of operating and is: input complex weighting module is carried out the complex weighting operation according to the default weights that are added with to the baseband signal of signal input part input.
5. pre-channel smart antenna MIMO wireless signal transmitting method as claimed in claim 3, it is characterized in that, in the step 1, described input complex weighting module is carried out the complex weighting method of operating and is: input complex weighting module according to circumstances or according to the weights that are added with that feedback information is dynamically adjusted is carried out the complex weighting operation to the baseband signal of signal input part input.
6. pre-channel smart antenna MIMO wireless signal transmitting method as claimed in claim 3, it is characterized in that, in the step 1, described input complex weighting module is carried out the complex weighting method of operating and is: input complex weighting module is carried out the complex weighting operation according to the weights that are added with by the programming mode adjustment to the baseband signal of signal input part input.
7. pre-channel smart antenna MIMO wireless signal transmitting method as claimed in claim 3 is characterized in that, in the step 2, described being treated to carried out the complex weighting operation earlier, carries out rf modulations again.
8. pre-channel smart antenna MIMO wireless signal transmitting method as claimed in claim 3 is characterized in that, described input complex weighting module adopts filter to replace.
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| CN103701514A (en) * | 2014-01-02 | 2014-04-02 | 东南大学 | Direction modulation method for realizing random disturbance by utilizing unit antenna |
| CN107017925A (en) * | 2017-04-13 | 2017-08-04 | 京信通信技术(广州)有限公司 | The signal processing method and device of a kind of Active Arrays |
| CN109194449A (en) * | 2018-10-12 | 2019-01-11 | 四川大学 | The non-orthogonal multiple Transmission system and method for pseudo channel precoding |
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Address after: 610065 No. 24 south part of Wuhou District first ring road, Chengdu, Sichuan. Co-patentee after: WANWEI DISPLAY TECHNOLOGY (SHENZHEN) Co.,Ltd. Patentee after: SICHUAN University Address before: 610065 No. 24 south part of Wuhou District first ring road, Chengdu, Sichuan. Co-patentee before: World wide software (Shenzhen) Co.,Ltd. Patentee before: Sichuan University |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161109 |
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| CF01 | Termination of patent right due to non-payment of annual fee |