CN102364903B - Hierarchical-modulation-based wireless relaying secure forwarding method - Google Patents
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- CN102364903B CN102364903B CN 201110358208 CN201110358208A CN102364903B CN 102364903 B CN102364903 B CN 102364903B CN 201110358208 CN201110358208 CN 201110358208 CN 201110358208 A CN201110358208 A CN 201110358208A CN 102364903 B CN102364903 B CN 102364903B
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Abstract
The invention relates to the technical field of wireless communication, and discloses a hierarchical-modulation-based wireless relaying secure forwarding method, which comprises that: a base station superposes and transmits modulated signals of a broadcast message and a relaying forwarding flag message at the same time in a first transmission time slot, wherein the transmission power of the broadcast message signal is greater than that of the relaying forwarding flag message signal; after receiving the superposed signals, a relay decodes the broadcast message from the superposed signals, and reconstructs the broadcast message signal according to the decoded broadcast message; the relay subtracts the reconstructed broadcast message signal from the received superposed signals to obtain the relaying forwarding flag message signal; the relay decodes the relaying forwarding flag message according to the relaying forwarding flag message signal; and the relay forwards the broadcast message of the base station to a user or the base station broadcasts new data according to the relaying forwarding flag message in a second transmission time slot. By the method provided by the invention, the information security of wireless relaying cooperative communication is improved, and a broadcast transmission delay can be shortened at the same time.
Description
Technical field
The present invention relates to wireless communication technology field, particularly the safe retransmission method of a kind of wireless relay based on hierarchical modulation.
Background technology
In wireless communication procedure, because transmitting power and the limited bandwidth of equipment, and channel quality meeting temporal evolution, the signal of sometimes base station transmission can not directly be decoded by the user.For addressing this problem, usually utilize relaying help the base station with data retransmission to the user, if namely the base station to the relatively poor and base station of the channel quality between the user to relaying and the channel quality that is relayed between the user better, then the base station can by via the transmit path the transmission of data of relaying to the user, the user can merge decoding to the signal that base station and relaying send.Common relay cooperative communication scheme has amplification forwarding (AF, Amplify-and-Forward), decoding forwarding (DF, Decode-and-Forward) etc.Amplification forwarding (AF) is the signal that relaying directly amplifies and forwarding receives from the base station, that is to say, relaying is a simple amplifier, signal to input only carries out linear process: relay reception also amplifies from the noisy signal of being with of base station, and the noisy base station signal of being with that will amplify sends to the user; The user merges decoding to the signal that base station and relaying send.(DF) transmitted in decoding is that relaying is decoded to the base station signal that receives first, and the regeneration symbolic information after will encoding according to original coded system or new coded system is transmitted to the user; The user merges decoding to the signal that base station and relaying send.
In radio communication, all Content of Communication (such as mobile subscriber's call-information, identity information, positional information, data message and mobile radio station and the signaling information between the network control center etc.) all transmit by radio wave.Because the broadcast characteristic that radio wave is propagated in air, the possibility that radio communication is ravesdropping has improved greatly.Traditional prevents that the method that radio communication is ravesdropping from being to use key that wireless communication data is encrypted, even the listener-in has listened to wireless communication signals like this, because the listener-in does not have key to decipher and can only obtain some mess codes.But if the information that stolen hearer listens to is abundant, the listener-in still can decrypt Content of Communication by methods such as content analyses.
In amplification forwarding and decode-and-forward relay system, no matter whether the transmitting data of base station is successfully received by the user, and relaying all can be to user's forwarding data.Take decode-and-forward relay as example, relaying adopts semiduplex mode, and will be divided into two time slots the unit interval: in first time slot, the base station is to relaying and user's broadcast transmission data; In second time slot, relaying is decoded by the signal of receiving and recompile is transmitted to the user, and no matter user's successful receive data whether.If data are successfully received by the user, the forwarding of the relay data of this moment will be useless so, the bandwidth that this will increase time delay and reduce the relay transmission its data.In order to address this problem, in increment forward relay system, the user will send feedback message to base station and relaying.If the user has successfully received the data from the base station, the user will be to base station and ACK of relaying feedback, and then relaying will be no longer to user's forwarding data; If the user does not successfully receive the data from the base station, the user will be to base station and NACK response of relaying feedback, and then relaying will be to user's forwarding data.But, in the more situation of number of users, receive the time delay that these field feedbacks will expend a large amount of system resource of base station and relaying and increase transfer of data.
Under many circumstances, whether the base station can notify relaying to need it to help forwarding data.If the peak transfer rate that known each user in base station can support, and the maximum rate that the selected data transmission rate in base station can be supported less than the difference channel user among all users, the base station will know that its data of broadcasting can successfully be received by all users, then notice relaying in base station is not wanted forwarding data in next time slot, new data just can be broadcasted in the base station in next time slot, can reduce propagation delay time like this.If but the maximum rate that the selected data transmission rate in base station can be supported greater than the difference channel user among all users, the base station will know that its data of broadcasting can not successfully be received by all users, then the base station should notify relaying at next time slot repeating data, to utilize the relaying cooperation effect to improve the reliability of transfer of data, guarantee that all users can both receive broadcast.
If comprising a relay forwarding sign in broadcast, the base station whether need it to help forwarding messages with the notice relaying, and the words that have the listener-in among the user, then listener-in and user will receive broadcast and relay forwarding sign, and the listener-in can know whether trunking will be at next time slot repeating data.If relaying is with forwarding data, the listener-in will start the monitor process for relaying, so just increase the possibility that the stolen hearer of data of relay forwarding listens to.
Summary of the invention
The technical problem that (one) will solve
Shortcoming for prior art, the stolen hearer of relay forwarding sign listens in the prior art if the present invention is in order to solve, then can increase the problem of the possibility that broadcast is ravesdropping, the safe retransmission method of a kind of wireless relay based on hierarchical modulation has been proposed, the possibility that listens to the stolen hearer of the data that greatly reduce relay forwarding.
(2) technical scheme
To achieve these goals, the present invention adopts following technical scheme:
The safe retransmission method of a kind of wireless relay based on hierarchical modulation, described method comprises step: at the first transmission time slot, simultaneously signal stack and the transmission after modulating respectively with broadcast and relay forwarding banner message of base station, wherein, the broadcast signal transmission power is greater than relay forwarding banner message signal transmission power; After relaying is received superposed signal, therefrom decode first broadcast, rebuild the broadcast signal according to the broadcast that decodes; Relaying deducts the broadcast signal of reconstruction from the superposed signal of receiving, obtain relay forwarding banner message signal; Relaying is transmitted banner message according to relay forwarding banner message signal decoding out-trunk;
At the second transmission time slot, according to the relay forwarding banner message, the broadcast of relay forwarding base station is to user or the new data of base station broadcast.
Preferably, at the first transmission time slot, the base station is carried out respectively coded modulation with broadcast and relay forwarding banner message and is carried out superposeing behind the serial to parallel conversion.
Preferably, at the first transmission time slot, also superposed signal is carried out the OFDM carrier modulation and added Cyclic Prefix in the front base station of transmission.
Preferably, described OFDM carrier modulation is inverse fast Fourier transform.
Preferably, at the first transmission time slot, relaying is removed Cyclic Prefix at first to received signal, carries out subsequently the OFDM demodulation.
Preferably, described OFDM carrier wave demodulation is fast Fourier transform.
Preferably, at the first transmission time slot, relaying carries out channel estimating according to broadcast pilot, obtains the broadcast channel gain, according to broadcast channel gain situation the broadcast signal is carried out the demodulation code, obtains broadcast; Decoded broadcast is carried out coded modulation to rebuild the broadcast signal.
Preferably, at the first transmission time slot, relaying carries out channel estimating according to unicast pilot signal, obtains the trunk channel gain, according to trunk channel gain situation relay forwarding banner message signal is carried out the demodulation code, obtains the relay forwarding banner message.
Preferably, the base station is that relay forwarding banner message signal distributes transmitting power according to the channel quality of relaying and subscriber channel, so that the maximum rate that relay forwarding banner message signal emission rate can be supported greater than the preferred channels user among all users, and the maximum rate that can support less than relaying.
Preferably, when maximum rate that base station selected broadcast signal emission rate can be supported less than or equal to the difference channel user among all users, relay forwarding banner message notice relaying at the second time slot by the new data of base station broadcast; When maximum rate that base station selected broadcast signal emission rate can be supported greater than the difference channel user among all users, relay forwarding banner message notice relaying in the broadcast of the second time slot repeating base station to the user.
(3) beneficial effect
In the method for the present invention, so that send simultaneously in the base station in the situation of broadcast and relay forwarding banner message, only have trunking can receive simultaneously broadcast and relay forwarding banner message, and the user can only receive broadcast with the listener-in who is hidden among the user.To greatly reduce like this possibility that the stolen hearer of data of relay forwarding listens to, improve the information security degree of wireless relay communication for coordination.In addition, the method for the present invention propagation delay time that can also reduce to broadcast.
Description of drawings
Fig. 1 is the typical application scenarios that the relay cooperative of the embodiment of the invention is transmitted safely;
Fig. 2 is the realization flow schematic diagram of base station end in the embodiments of the invention;
Fig. 3 is the realization flow schematic diagram of relay in the embodiments of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work belongs to the scope of protection of the invention.In fact the equipment that relates to herein be not limited to this all take wireless communication cell base station, relaying and user mobile phone as example, can be any information equipment with sending and receiving function.
Whether with notice relaying need it help the scene of forwarding messages, this scene comprises a base station, a relaying, a listener-in and n user as shown in Figure 1 at least in this scene if the present invention is based on base station broadcast relay forwarding sign.Usually the repeater span base station is nearer, and user and listener-in are far away apart from the base station.The base station will send to user's broadcast x
bWith relay forwarding banner message x
fAnalog signal stack after modulating respectively also sends, and namely transmitted signal is x=x
b+ x
f, wherein distribute to broadcast x
bThe transmitting power P of signal
bLarger, distribute to relay forwarding banner message x
fThe transmitting power P of signal
fLess, P preferably
bMuch larger than P
f(for example power ratio is greater than 4: 1, i.e. P
b/ P
f＞4), P=P
b+ P
f
Particularly, to the hierarchical modulation of the relay forwarding system in Fig. 1 scene the time, the transmitting power that general base station arranges strong signal (being the broadcast signal) is far longer than the transmitting power of weak signal (being relay forwarding banner message signal), such as power ratio greater than 4: 1.Suppose that the base station end is P for the transmitting power of signal X, noise power is N, and then launching signal to noise ratio is ρ=P/N; Suppose that the base station is h to user's channel gain, according to Shannon's theorems, the maximum data rate that subscriber channel can be supported is
Wherein, W is transmitted bandwidth.
In the case, if the selected signal emission rate in base station is less than or equal to channel capacity (being the maximum data rate that subscriber channel can be supported), then the user can successful decoded signal X; If the selected signal emission rate in base station is greater than channel capacity (being the maximum data rate that subscriber channel can be supported), then the user can not successful decoded signal X.
So in the method for the present invention, the maximum rate that base station selected relay forwarding banner message signal emission rate can be supported greater than the preferred channels user among all users, and the maximum rate that can support less than relaying, this will guarantee to only have relaying can receive the relay forwarding banner message, and the user can not receive the relay forwarding banner message.
Subsequently, when relaying is decoded, the relaying strong signal x that at first decodes
b, this moment weak signal x
fBe regarded as disturbing, can guarantee that the rational transmitting power setting of base station end relaying is to broadcast x
bSuccessful decoding.Successfully decode broadcast x at relaying
bAfter, relaying is rebuild broadcast singal x
bAnd it is deducted, thereby obtain glitch-free marking signal x from total reception signal
fBecause the repeater span base station is nearer, so the channel quality between relaying and base station is better, relaying can continue to decode banner message x
f
When user and listener-in attempt to decode, same, user and the listener-in strong signal x that at first decodes
b, this moment is with weak signal x
fBe considered as disturbing, successfully decode broadcast x the listener-in
bAfter, user and listener-in's reconstruction signal x
bAnd it is deducted from total reception signal, obtain glitch-free marking signal x
fBecause the channel quality between user and listener-in and base station is relatively poor, so user and listener-in can't continue to decode banner message x
f
By the way, when the base station with broadcast singal x
bWith marking signal x
fAfter stack and the transmission, the relaying that the channel quality nearer apart from the base station is good can successfully decode broadcast x
bWith banner message x
f, and the user of the bad channel quality far away apart from the base station and listener-in can only successfully decode broadcast x
bTherefore, whether relaying wants this information of repeating base station signal to only have base station and relaying to know, and be hidden in the listener-in among the user and do not know this information, thereby the possibility that listens to of the stolen hearer of the data that greatly reduced relay forwarding, improved the information security degree of wireless relay communication for coordination.
Below, we will introduce hierarchical modulation in the implementation procedure of transmitting terminal (taking the base station as example) and receiving terminal (take relaying as example).The implementation procedure of base station end as shown in Figure 2, the base station end carries out broadcast and banner message respectively coded modulation and carries out serial to parallel conversion, broadcast singal and marking signal after will modulating superpose again, and wherein λ P and (1-λ) P are respectively the transmitting powers of distributing to broadcast singal and marking signal.Then data are carried out inverse fast Fourier transform (IFFT, Inverse Fast Fourier Transform), be equivalent to carry out the OFDM carrier modulation.Add at last Cyclic Prefix (CP, Cyclic Prefix) and send.
The relay for the demodulating and decoding process of base station signal as shown in Figure 3, concrete demodulating and decoding step is:
1) removes to received signal cyclic prefix CP, do fast fourier transform (FFT) carrying out the OFDM demodulation, and preserve the reception signal after the OFDM demodulation;
2) carry out channel estimating according to broadcast pilot, obtain channel gain, and broadcast singal is carried out the demodulation code, obtain broadcast;
3) decoded broadcast is carried out coded modulation with the reconstruction broadcast singal, and from the reception signal of preserving, deduct the broadcast singal of reconstruction, thereby obtain glitch-free marking signal;
4) marking signal is carried out the demodulation code, obtain banner message.
Then, relaying judges whether that according to its banner message that receives needs transmit, if need to transmit, relaying then at next transmission time slot repeating base station signal to the user, the user merges decoding to the signal that sends from base station and relaying; If do not need to transmit, new data, the propagation delay time that can reduce to broadcast like this will be broadcasted in the base station in next transmission time slot.
Be hidden in the listener-in among the user and do not know relaying in second transmission time slot whether with this information of repeating base station signal, thereby the possibility that listens to of the stolen hearer of the data that greatly reduced relay forwarding, improved the information security degree of wireless relay communication for coordination.
In the safe retransmission method of the wireless relay based on hierarchical modulation of the present invention, at first transmission time slot, simultaneously signal stack and the transmission after modulating respectively with broadcast and relay forwarding banner message of base station, the relaying that the channel quality nearer apart from the base station is good can successfully decode broadcast and banner message, and the user of the bad channel quality far away apart from the base station and listener-in can only successfully decode broadcast.Therefore, whether relaying wants this information of repeating base station signal to only have base station and relaying to know, and is hidden in the listener-in among the user and does not know this information.If in second transmission time slot, relaying is determined and the repeating base station signal according to banner message, because the listener-in does not also know that this moment, relaying was wanted this information of repeating base station signal, thereby the possibility that listens to of the stolen hearer of data that will greatly reduce relay forwarding, improved the information security degree of wireless relay communication for coordination; If in second transmission time slot, relaying is determined not repeating base station signal (this information is obviously also known as sending flag information side in the base station) according to banner message, new data, the propagation delay time that can reduce to broadcast like this will be broadcasted in the base station in second transmission time slot.
Above execution mode only is used for explanation the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; in the situation that does not break away from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and invention protection range of the present invention should be defined by the claims.
Claims (9)
1. safe retransmission method of the wireless relay based on hierarchical modulation is characterized in that described method comprises step:
At the first transmission time slot, base station signal stack and transmission after modulating respectively with broadcast and relay forwarding banner message, wherein, the broadcast signal transmission power is greater than relay forwarding banner message signal transmission power; After relaying is received superposed signal, therefrom decode first broadcast, rebuild the broadcast signal according to the broadcast that decodes; Relaying deducts the broadcast signal of reconstruction from the superposed signal of receiving, obtain relay forwarding banner message signal; Relaying is transmitted banner message according to relay forwarding banner message signal decoding out-trunk;
At the second transmission time slot, according to the relay forwarding banner message, the broadcast of relay forwarding base station is to user or the new data of base station broadcast;
When maximum rate that base station selected broadcast signal emission rate can be supported less than or equal to the difference channel user among all users, relay forwarding banner message notice relaying at the second time slot by the new data of base station broadcast; When maximum rate that base station selected broadcast signal emission rate can be supported greater than the difference channel user among all users, relay forwarding banner message notice relaying in the broadcast of the second time slot repeating base station to the user.
2. method according to claim 1 is characterized in that, at the first transmission time slot, the base station is carried out respectively coded modulation with broadcast and relay forwarding banner message and carried out superposeing behind the serial to parallel conversion.
3. method according to claim 1 is characterized in that, at the first transmission time slot, also superposed signal is carried out the OFDM carrier modulation and is added Cyclic Prefix in the front base station of transmission.
4. method according to claim 3 is characterized in that, described OFDM carrier modulation is inverse fast Fourier transform.
5. according to claim 1 or 3 described methods, it is characterized in that at the first transmission time slot, relaying is removed Cyclic Prefix at first to received signal, carry out subsequently the OFDM demodulation.
6. method according to claim 5 is characterized in that, described OFDM is demodulated into fast Fourier transform.
7. method according to claim 1 is characterized in that, at the first transmission time slot, relaying carries out channel estimating according to broadcast pilot and obtains channel gain, according to the channel gain situation broadcast signal is carried out the demodulation code, obtains broadcast; Decoded broadcast is carried out coded modulation to rebuild the broadcast signal.
8. method according to claim 1, it is characterized in that, at the first transmission time slot, relaying carries out channel estimating according to unicast pilot signal, obtain the trunk channel gain, according to trunk channel gain situation relay forwarding banner message signal is carried out the demodulation code, obtain the relay forwarding banner message.
9. method according to claim 1, it is characterized in that, the base station is that relay forwarding banner message signal distributes transmitting power according to the channel quality of relaying and subscriber channel, so that the maximum rate that relay forwarding banner message signal emission rate can be supported greater than the preferred channels user among all users, and the maximum rate that can support less than relaying.
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| CN102364903B true CN102364903B (en) | 2013-04-10 |
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| CN103138892B (en) * | 2013-01-31 | 2015-05-27 | 西安电子科技大学 | Self-adaption relay communication method based on ladder modulation |
| CN103415075B (en) * | 2013-08-26 | 2016-06-15 | 北京邮电大学 | Wireless relay collaborative transmission method and device |
| CN103997759B (en) * | 2014-05-28 | 2017-03-15 | 北京邮电大学 | A kind of data transmission method for wireless relay communication |
| CN105024748B (en) * | 2015-08-04 | 2017-12-26 | 北京理工大学 | A kind of satellite communication up-link access method and device |
| CN107484246B (en) * | 2017-09-08 | 2021-08-17 | 哈尔滨工业大学深圳研究生院 | Resource allocation method, system and storage medium based on cooperative interference |
| CN109274478B (en) * | 2018-10-12 | 2021-11-12 | 泉州市顺风耳电子科技有限公司 | Common-frequency double-time-slot half-duplex digital communication relay method |
| CN110034795B (en) * | 2019-03-13 | 2021-06-15 | 北京邮电大学 | Method and device for detecting eavesdropping pilot frequency in channel training process |
| CN112019426B (en) * | 2020-08-25 | 2022-09-20 | 北京升哲科技有限公司 | Information interaction system |
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| US7684337B2 (en) * | 2006-01-17 | 2010-03-23 | Mitsubishi Electric Research Laboratories, Inc. | Method and system for communicating in cooperative relay networks |
| CN101826899B (en) * | 2009-03-02 | 2013-06-05 | 华为技术有限公司 | Signal transmission method and device based on relay |
| CN101588339B (en) * | 2009-06-12 | 2011-12-28 | 北京邮电大学 | Method for reducing wireless relaying redundant forwarding on the basis of iterated code |
| CN101969396B (en) * | 2010-09-02 | 2013-08-14 | 北京邮电大学 | Time delay and bandwidth resource-based relay selection method |
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