CN103517275B - The method and apparatus of device-to-device communication - Google Patents

The method and apparatus of device-to-device communication Download PDF

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Publication number
CN103517275B
CN103517275B CN201210215565.2A CN201210215565A CN103517275B CN 103517275 B CN103517275 B CN 103517275B CN 201210215565 A CN201210215565 A CN 201210215565A CN 103517275 B CN103517275 B CN 103517275B
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described
signal
module
described step
carried out
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CN201210215565.2A
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CN103517275A (en
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刘勇
杨凯
蔡立羽
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上海贝尔股份有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • H04W76/14Direct-mode setup
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W8/00Network data management
    • H04W8/005Discovery of network devices, e.g. terminals

Abstract

The present invention proposes a kind of method carrying out device-to-device communication in LTE TDD cellular radio Communication system, including: to needing to carry out the user equipment allocation frequency resource of described device-to-device communication, wherein, the form of described frequency resource is identical with the form that cellular link in described cellular radio Communication system is used;And, described subscriber equipment carries out described device-to-device communication in described frequency resource, and wherein, described subscriber equipment uses identical wireless access way at transmitting terminal with receiving terminal.

Description

The method and apparatus of device-to-device communication

Technical field

The present invention relates to wireless communication technology field, particularly relate to device-to-device communication.

Background technology

General, in cellular radio communication network, the Long Term Evolution LTE of such as 3GPP Or advanced person LTE (Long Term Evolution, or LTE-ALong Term Evolution-Advance), in, two subscriber equipmenies (UE) are carried out via base station (eNB) Communication.But, in order to meet to the demand of Internet resources effective use and to new services Demand, it is proposed that apply direct device-to-device (Device to Device, D2D) lead to The requirement of letter.Communicated by D2D, the load of base station can be shared, it is also possible to by movement The mode of relaying increases the covering of base station.Therefore, in LTE-A, D2D communication is connect By being the important enhancing of one to cellular mobile communication.Particularly at LTE time division duplex In (LTE-TDD Time Division Duplex) system, owing to uplink downlink uses phase Same frequency range, is especially suitable for using D2D communication.

But, existing LTE-TDD system can not realize D2D communication, and main cause exists Transceiver in existing LTE-TDD UE uses different at transmitting terminal and receiving terminal Wireless access way, transmitter uses single carrier frequency division multiplexing SC-FDMA (Single Carrier-Frequency Division Multiple Access), and receiver uses orthogonal Frequency division multiplexing 0FDMA (Orthogonal Frequency Division Multiple Access), Therefore cannot directly communicate between UE, thus also cannot realize the D2D communication between UE. Additionally, introduce D2D communication in LTE-TDD system to also can result in cellular communication link And interfering with each other between D2D communication link, the most how to realize channeling, it is to avoid dry Disturb and be also introduced into the problem that D2D communication have to solve.

Prior art has been carried out some relevant work, example to solve the problems referred to above The FlashLinQ technology proposed such as high pass (Qualcomm) company.Wanting of this technical scheme Point includes:

Allocate one section of special frequency spectrum in advance to communicate for D2D,

In UE, increase a set of transceiver working in above-mentioned frequency range be exclusively used in D2D communication.

The program is disadvantageous in that, as the outer solution of one band, it needs extra Taking the frequency resource of preciousness, the frequency resource being therefore available for cellular communication system use is corresponding Decrease;And this part resource cannot dynamically reclaim, cause not having D2D communication to need Also cannot use these resources when of asking, cause the waste of frequency resource;Additionally need In UE, increase a set of single transceiver, which greatly increases cost and the complexity of UE Degree.

Summary of the invention

To this end, D2D communication solves in LTE-TDD cellular communication system needs a kind of new band Scheme, the program without extra frequency spectrum, and should must solve channeling with dynamic The problem of frequency distribution, also needs to improve to support the party to the transceiver of UE accordingly Case, and this improvement to UE must be simple and low cost.

For solving the problems referred to above of the prior art, the present invention propose a kind of new LTE-TDD cellular radio Communication system realizes D2D communication scheme, use and honeycomb without The frequency resource of line communication system same format carries out D2D communication and improves the transceiver of UE To support to use same wireless access way in sending and receiving end.

Specifically, according to the first aspect of the invention, it is provided that a kind of at LTE-TDD honeycomb The method carrying out device-to-device communication in wireless communication system, including: carry out institute to needs State the user equipment allocation frequency resource of device-to-device communication, wherein, described frequency resource Form identical with the form that cellular link in described cellular radio Communication system is used;With And, described subscriber equipment carries out described device-to-device communication in described frequency resource, its In, described subscriber equipment uses identical wireless access way at transmitting terminal with receiving terminal.

Preferably, described for need to carry out the user equipment allocation of described device-to-device communication Frequency resource and described cellular radio Communication system in ascending honeycomb link and downlink cellular The multiplexing on frequency domain of frequency resource shared by link.

It is highly preferred that described frequency resource is entered by the base station in described cellular radio Communication system Row distribution, the method also includes: described base station sends the first signaling to described subscriber equipment and disappears Breath, described first signaling message indicates described frequency resource to described subscriber equipment;Described use Family equipment receives described first signaling message that described base station sends.

It is highly preferred that described base station sends the second signaling message to described subscriber equipment, described Second signaling message indicates the change of described frequency resource to described subscriber equipment;Described user Equipment receive described base station send described second signaling message and described change frequency provide Described device-to-device communication is carried out on source.

Preferably, wherein said frequency resource is needed to carry out described device-to-device led to by described The subscriber equipment of letter is allocated.

It is highly preferred that wherein said identical wireless access way is OFDM OFDMA or single carrier frequency division multiplexing SC-FDMA.

According to the second aspect of the invention, it is provided that a kind of at LTE-TDD cellular radio Communication For the transmitter supporting device-to-device to communicate in the subscriber equipment of system, including: discrete Fu Vertical leaf transformation module, for carrying out after discrete Fourier transform (DFT) converted to input signal Signal;Modulation module, for being mapped to multiple by each symbol of the signal after described conversion On subcarrier and carry out the signal after OFDM is modulated;Cyclic Prefix inserts module, For the signal after described modulation being inserted the signal after Cyclic Prefix is inserted;Digital-to-analogue turns Die change block, obtains armed signal for the signal after described insertion is carried out digital-to-analogue conversion; Transmitter module, is used for launching described armed signal;Wherein, model selection mould is also included Block, is used for choosing whether to bypass described discrete Fourier transform module and by described input signal It is directly inputted to described modulation module.

Preferably, between described Cyclic Prefix insertion module and described D/A converter module also Including power control module, for selecting to bypass described discrete Fu at described mode selection module During vertical leaf transformation module, described Cyclic Prefix is inserted the letter after the described insertion of module output Number carry out power control.

It is highly preferred that described mode selection module receives the instruction information sent by base station;Root According to described instruction information, carry out described selection.

According to the third aspect of the invention we, it is provided that a kind of at LTE-TDD cellular radio Communication The method launching signal in the subscriber equipment of system, comprises the following steps: b. is to input signal Carry out the signal after discrete Fourier transform (DFT) is converted;C. by the signal after described conversion Each symbol is mapped on multiple subcarrier and carries out the letter after OFDM is modulated Number;D. the signal after described modulation is inserted the signal after Cyclic Prefix is inserted;The most right Signal after described insertion carries out digital-to-analogue conversion and obtains armed signal;F. treat described in launching The signal launched;Wherein, further comprising the steps of before described step b: a. selection is No skip described step b and directly perform described step c.

Preferably, select to skip described step b and by described input signal when described step a When being directly inputted to described step c, between described step d and described step e, also include step Rapid g, carries out power control to the signal after described insertion.

It is highly preferred that described step a also includes receiving the instruction information sent by base station;Root According to described instruction information, carry out described selection.

According to the fourth aspect of the invention, it is provided that a kind of at LTE-TDD cellular radio Communication For the receiver supporting device-to-device to communicate in the subscriber equipment of system, including: receive mould Block, for receiving the signal that wireless signal obtains receiving;Analog-to-digital conversion module, for right The described signal received carries out the signal after analog digital conversion obtains analog digital conversion;Remove circulation Prefix module, after being removed the signal removal Cyclic Prefix after described analog digital conversion Signal;Demodulation module, obtains for the signal after described removal is carried out OFDM demodulation Signal after demodulation;Balance module, for carrying out frequency domain equalization to the signal after described demodulation Signal after being equalized;Inverse discrete fourier transformed module, after to described equilibrium Signal carries out inverse discrete fourier transformed and obtains output signal;Wherein, also include: output selects Module, is used for choosing whether to bypass described balance module and described inverse discrete fourier transformed mould Block and the signal after described demodulation is directly exported.

Preferably, described output selects module to receive the instruction information sent by base station;According to Described instruction information, carries out described selection.

According to the fifth aspect of the invention, it is provided that a kind of at LTE-TDD cellular radio Communication The method receiving signal in the subscriber equipment of system, including: m. receives wireless signal and is connect The signal received;N. the described signal received is carried out after analog digital conversion obtains analog digital conversion Signal;O. the signal after described analog digital conversion is removed the letter after Cyclic Prefix is removed Number;Signal after the most described removal carries out the signal after OFDM demodulation is demodulated;Q. institute State the signal after demodulation and carry out the signal after frequency domain equalization is equalized;After the most described equilibrium Signal carries out inverse discrete fourier transformed and obtains output signal;Wherein, described step q it Before also include: s. chooses whether to bypass described step q and described step r and by after described demodulation Signal directly export.

Preferably, described step s receives the instruction information sent by base station;According to described instruction Information, carries out described selection.

In the present invention, by using the frequency format identical with cellular radio Communication system to be used for Device-to-device communicates, it is possible to use existing frequency resource and increase without extra, simultaneously Effective multiplexing of frequency can be realized, it is to avoid interference;By frequency resource being carried out by base station Control, it is possible to achieve dynamic frequency allocation;By transmitter being increased bypass and power control The simple modifications of module, can make transmitter can launch SC-FDMA signal, can launch again OFDMA signal, to realize directly communicating between UE;It is equal by receiver is increased frequency Weighing apparatus and the simple modifications of inverse Fourier transform module, can make receiver to receive SC-FDMA signal can receive again OFDMA signal, to realize directly communicating between UE. Therefore the solution of the present invention is used, can be simply and easily at LTE-TDD cellular communication system The middle function realizing D2D communication, solves the problem that prior art exists.

Accompanying drawing explanation

The following detailed description to non-limiting example is read by referring to accompanying drawing, this Further feature, purpose and the advantage of invention will will become more apparent.

Fig. 1 shows the channeling of up-link in existing LTE-TDD system;

Fig. 2 shows the channeling of downlink in existing LTE-TDD system;

Fig. 3 shows a kind of D2D communication according to the present invention and cellular communication system uplink The channeling on road;

Fig. 4 shows a kind of D2D communication according to the present invention and the descending chain of cellular communication system The channeling on road;

Fig. 5 shows that the another kind of D2D communication according to the present invention and cellular communication system are up The channeling of link;

Fig. 6 shows that the another kind of D2D communication according to the present invention and cellular communication system are descending The channeling of link;

Fig. 7 shows a kind of D2D communication frequency method of salary distribution according to the present invention;

Fig. 8 shows the user at LTE-TDD cellular radio Communication system according to the present invention For the transmitter supporting D2D to communicate in equipment UE;

Fig. 9 shows the user at LTE-TDD cellular radio Communication system according to the present invention For the receiver supporting D2D to communicate in equipment UE.

Wherein, same or analogous reference represents same or analogous steps characteristic or dress Put/module.

Detailed description of the invention

The detailed description of the invention of the present invention is described below in conjunction with accompanying drawing.

Such as Fig. 1, shown in Fig. 2, in LTE-TDD system, up-link uses SC-FDMA accesses, and downlink uses OFDMA to access.No matter up or under OK, frequency resource allocation flexibly can be supported by the way of frequency domain multiplexing.So-called frequency Rate multiplexing, namely different user terminal uses different frequency resources to communicate.Such as figure Shown in, base station can be according to concrete state of affairs, to the band that different UE distribution is different Wide frequency resource, these frequency resources frequency domain multiplexing from without formed crossover.Another Aspect, the OFDMA that the SC-FDMA that up-link uses accesses and downlink uses connects Enter and have employed very similar parameter configuration, including identical sub-carrier space, identical list Position bandwidth occupancy number of subcarriers and identical circulating prefix-length etc..It is to say, be upper The frequency resource form of downlink distribution is identical.

Therefore the present invention proposes, and use frequency resource form as cellular communication system is D2D allocation of communications frequency resource.As shown in Figures 3 to 6, the phase for D2D allocation of communications The honeybee of the frequency resource answered, the form of this component frequency resource and existing LTE-TDD system The form that nest communication link uses is identical.In order to reduce the interference to other cellular communication activities, When carrying out frequency resource allocation, the method being referred to cellular communication system, make this part Frequency resource that frequency resource takies with up SC-FDMA link on frequency domain simultaneously and under The frequency resource multiplexing that row OFDMA link takies.Corresponding UE is then in this frequency resource On use identical wireless access way to carry out the transmitting-receiving of D2D communication data in sending and receiving end.Examine Consider the design to existing LTE-TDD terminal, OFDMA or SC-FDMA is preferably used Mode, one of such receiver or transmitter can continue to use original design without amendment.But The present invention other wireless access way equally applicable, such as CDMA etc..Fig. 3, Fig. 4 Show that D2D communication uses OFDMA mode, and the frequency resource that D2D communication uses is same Time with up SC-FDMA link and descending OFDMA link multiplexing, namely D2D The frequency resource that communication uses and up SC-FDMA link and descending OFDMA link The frequency resource used is the most different;Fig. 5, Fig. 6 show that D2D communication uses SC-FDMA Mode, and the frequency resource that D2D communication uses simultaneously with up SC-FDMA link and Descending OFDMA link multiplexing, namely the frequency resource that D2D communication uses is with up The frequency resource that SC-FDMA link and descending OFDMA link are used is the most different.

When carrying out D2D communication in base station range, the distribution of said frequencies resource is permissible Being determined by base station, base station distributes to the frequency resource of D2D communication according to network condition determining After, send the first signaling message and notify that corresponding UE, corresponding UE are according to received One signaling message obtains corresponding frequency resource, carries out D2D communication.The most also may be used To support that the frequency resource communicated D2D by base station dynamically adjusts, when base station is according to working as When front network condition determines dynamically to adjust the frequency resource of D2D communication, base station is sent out Corresponding UE, corresponding UE are according to the second signaling received to send the second signaling message to notify Message obtains corresponding frequency resource after adjusting, and uses the frequency resource after this adjustment to enter Row D2D communicates.By this dynamic adjustment, D2D communication and cellular radio Communication can be made Realize the flexible allocation of resource, adapt to different network conditions.Such as, when honeycomb in network When wireless communication load is higher, can suitably reduce and distribute to the resource that D2D communication uses, And when cellular radio Communication load is relatively low, the resource distributing to D2D communication can be increased.

During it addition, carry out D2D communication outside base station range, said frequencies resource Distribution can be decided in its sole discretion by requisition for the UE carrying out D2D communication, as it is shown in fig. 7, Distributed certain band frequency resource voluntarily to communicate by UE.This decision can be communicated by initiation one The opposing party of side or communication makes, it is also possible to made through consultation by the both sides communicated.This Sample can be in the case of base station covers and does not reaches, it is ensured that user is by possessing D2D communication merit The UE of energy remains able to realize some application.

D2D communication according to said method, it is desirable to UE possesses the wireless access that use is identical Mode carries out the ability of D2D communication data transmitting-receiving.But existing LTE-TDD system uses UE transmitter use SC-FDMA, and receiver uses OFDMA, because of This does not possess this ability, it is necessary to improved the D2D communication that the present invention could be supported to propose Method.The scene that is normally applied in view of D2D communication has the feature that and communicates Distance between UE is close (generally less than 30 meters), and the channel quality between UE is preferable, Application needs D2D communication to support high rate data transmission etc..Therefore the present invention proposes, and D2D communicates Employed in identical preferred OFDMA or SC-FDMA of wireless access way, so Preferred version both fully taken into account D2D communication feature, it is also contemplated that with existing equipment Compatibility so that one of the receiver of existing UE or transmitter can be continuing with and not Improve, cost is also economical.

Owing to, in UE, cost is maximum, and volume the best part is mainly radio circuit part, Therefore the present invention proposes and does not changes radio circuit and only modify digital circuits section Scheme.

Fig. 8 shows the block diagram of a kind of transmitter according to the present invention, and this transmitter can Enough the same with existing LTE-TDD UE, launch for cellular communication up-link SC-FDMA signal, can launch again the OFDMA that the D2D communication according to the present invention uses Signal, so, the receiver section of UE is not used as any change, because the D2D received Signal of communication is the identical OFDMA signal used with cellular communication downlink.

This transmitter includes discrete Fourier transform module 81, for input signal carried out from Scattered Fourier transform converted after signal;

Modulation module 82, for being mapped to multiple by each symbol of the signal after described conversion On subcarrier and carry out the signal after OFDM is modulated;

Cyclic Prefix inserts module 83, for the signal after described modulation is inserted Cyclic Prefix Signal after being inserted;

D/A converter module 84, obtains for the signal after described insertion is carried out digital-to-analogue conversion Armed signal;

Transmitter module 85, is used for launching described armed signal;

Also include mode selection module 80, be used for choosing whether that bypassing described discrete Fourier becomes Described input signal is also directly inputted to described modulation module by die change block.

When UE needs to send data to base station, mode selection module 80 select not bypass from Dissipating fourier transform module 81, at this moment transmitter is to input signal (a0, a1..., aM-1) Process compared with UE identical, the signal finally launched is SC-FDMA signal, Ke Yiyong Ul transmissions in cellular communication.When UE needs to carry out D2D communication, pattern is selected Select module 80 select bypass discrete Fourier transform module 81, at this moment input signal without from Dissipate Fourier transform but map directly to carry out on subcarrier OFDM modulation, the most finally The signal launched is OFDMA signal.

Typically than SC-FDMA signal, there is the transmitting of higher moment in view of OFDMA signal Power, in order to improve peak-to-average force ratio, it is also possible to preferably inserts module 83 and digital-to-analogue at Cyclic Prefix A power control module 86 is increased, when UE needs to carry out D2D between modular converter 84 During communication, Cyclic Prefix can be inserted the signal of module 83 output by power control module 86 Carry out power control, reduce the effect of peak-to-average force ratio.

Owing to above-mentioned improvement pertains only to digital circuits section, therefore mode selection module 80 is permissible According to the instruction of the base station received, carry out patten transformation easily, to launching the wireless of signal Access way switches over.

Hereinafter the signal launch party that transmitter provided by the present invention and above-mentioned is corresponding is introduced again Method, in view of steps characteristic therein has corresponding relation with the architectural feature in above-mentioned transmitter, To conform to the principle of simplicity.

The method of this transmitting signal, comprises the following steps: b. carries out discrete Fu to input signal Vertical leaf transformation converted after signal;C. each symbol of the signal after described conversion is reflected It is mapped on multiple subcarrier and carries out the signal after OFDM is modulated;D. to described Signal after modulation inserts the signal after Cyclic Prefix is inserted;E. after to described insertion Signal carries out digital-to-analogue conversion and obtains armed signal;F. described armed signal is launched; Wherein, further comprising the steps of before described step b: a. chooses whether to skip described step Rapid b also directly performs described step c.

Preferably, select to skip described step b and by described input signal when described step a When being directly inputted to described step c, between described step d and described step e, also include step Rapid g, carries out power control to the signal after described insertion.

It is highly preferred that described step a also includes the instruction letter sent according to the base station received Breath carries out described selection.

Fig. 9 shows the block diagram of a kind of receiver according to the present invention, and this receiver can Enough the same with existing LTE-TDD UE, receive what cellular communication downlink used OFDMA signal, can receive again the SC-FDMA that the D2D communication according to the present invention uses Signal, so, the transmitter section of UE is not used as any change, because the D2D launched Signal of communication is the identical SC-FDMA signal used with cellular communication up-link.

This receiver includes receiver module 91, for receiving the letter that wireless signal obtains receiving Number;

Analog-to-digital conversion module 92, obtains for the described signal received is carried out analog digital conversion Signal after analog digital conversion;

Remove cyclic prefix module 93, for the signal after described analog digital conversion is removed circulation Prefix removed after signal;

Demodulation module 94, is solved for the signal after described removal is carried out OFDM demodulation Signal after tune;

Balance module 95, is equalized for the signal after described demodulation is carried out frequency domain equalization After signal;

Inverse discrete fourier transformed module 96, for the signal after described equilibrium carried out inverse from Scattered Fourier transform obtains output signal;

Also include that output selects module 97, be used for choosing whether to bypass described balance module 95 He Described inverse discrete fourier transformed module 96 and the signal after described demodulation is directly exported.

When UE needs the data receiving base station transmission, mode selection module 97 selects bypass Described balance module 95 and described inverse discrete fourier transformed module 96 and by after described demodulation Signal directly export, at this moment receiver docking collect mail number process compared with UE identical, Signal (a finally exported0, a1..., aM-1) it is OFDMA signal, may be used for receiving The downlink transmission of cellular communication.When UE needs to carry out D2D communication, model selection Module 97 selects not bypass described balance module S95 and described inverse discrete fourier transformed module 96, at this moment reception signal is after OFDM demodulation, first passes through balance module 95 and carries out nothing Line selectivity of channel frequency compensates, the most again through inverse discrete fourier transformed, the most finally Signal (a of output0, a1..., aM-1) it is SC-FDMA signal.

Owing to above-mentioned improvement pertains only to digital circuits section, therefore mode selection module 97 is permissible According to the instruction of the base station received, carry out patten transformation, the process of the docking collection of letters number easily Mode switches over.

Hereinafter the receiving side signal that receiver provided by the present invention and above-mentioned is corresponding is introduced again Method, in view of steps characteristic therein has corresponding relation with the architectural feature in above-mentioned receiver, To conform to the principle of simplicity.

The method of this reception signal, including: m. receives the signal that wireless signal obtains receiving; N. the described signal received is carried out the signal after analog digital conversion obtains analog digital conversion;The most right Signal after described analog digital conversion removes the signal after Cyclic Prefix is removed;The most described go Signal after removing carries out the signal after OFDM demodulation is demodulated;Letter after the most described demodulation Number carry out the signal after frequency domain equalization is equalized;Signal after the most described equilibrium carry out inverse from Scattered Fourier transform obtains output signal;Wherein, also included before described step q: s. selects Select and whether bypass described step q and described step r and by the most defeated for the signal after described demodulation Go out.

Preferably, described step s carries out described according to the instruction information that the base station received sends Select.

Above embodiments of the invention are described, but the invention is not limited in spy Fixed system, equipment and concrete agreement, those skilled in that art can want in appended right Various deformation or amendment is made in the range of asking.

The those skilled in the art of those the art can be by research description, disclosed Content and accompanying drawing and appending claims, understand and implement the embodiment disclosed Other change.In the claims, word " includes " element and the step being not excluded for other, And wording " one " is not excluded for plural number.In the present invention, " first ", " second " Only represent title, do not represent orbution.In the actual application of invention, a part can The function of multiple technical characteristics cited in claim can be performed.Appointing in claim What reference should not be construed as the restriction to scope.

Claims (10)

1. one kind is used for supporting in the subscriber equipment of LTE-TDD cellular radio Communication system The transmitter of device-to-device communication, including:
Discrete Fourier transform module, obtains for input signal is carried out discrete Fourier transform (DFT) Signal after conversion;
Modulation module, for being mapped to many height by each symbol of the signal after described conversion On carrier wave and carry out the signal after OFDM is modulated;
Cyclic Prefix inserts module, obtains for the signal after described modulation is inserted Cyclic Prefix Signal after insertion;
D/A converter module, is treated for the signal after described insertion is carried out digital-to-analogue conversion The signal launched;
Transmitter module, is used for launching described armed signal;
Wherein, also include mode selection module, be used for choosing whether to bypass described discrete Fourier Described input signal is also directly inputted to described modulation module by leaf transformation module.
Transmitter the most according to claim 1, it is characterised in that before described circulation Sew and also include power control module between insertion module and described D/A converter module, be used for When described mode selection module selects to bypass described discrete Fourier transform module, follow described Signal after ring prefix inserts the described insertion of module output carries out power control.
Transmitter the most according to claim 1 and 2, it is characterised in that described pattern Selection module is additionally operable to,
-receive the instruction information sent by base station;
-according to described instruction information, carry out described selection.
4. in the subscriber equipment of LTE-TDD cellular radio Communication system, launch signal for one kind Method, comprise the following steps:
B. input signal is carried out the signal after discrete Fourier transform (DFT) is converted;
C. each symbol of the signal after described conversion it is mapped on multiple subcarrier and carries out OFDM modulated after signal;
D. the signal after described modulation is inserted the signal after Cyclic Prefix is inserted;
E. the signal after described insertion is carried out digital-to-analogue conversion and obtain armed signal;
F. described armed signal is launched;
Wherein, further comprising the steps of before described step b:
A. choose whether skip described step b and directly perform described step c.
Method the most according to claim 4, wherein, when described step a selects to skip Described step b time described input signal is directly inputted to described step c, in described step Suddenly also include step g between d and described step e, the signal after described insertion is carried out power Control.
Method the most according to claim 5, wherein, described step a also includes basis The instruction information that the base station received sends carries out described selection.
7. one kind is used for supporting in the subscriber equipment of LTE-TDD cellular radio Communication system The receiver of device-to-device communication, including:
Receiver module, is used for receiving wireless signal;
Analog-to-digital conversion module, obtains for the described wireless signal received is carried out analog digital conversion Signal after analog digital conversion;
Remove cyclic prefix module, before the signal after described analog digital conversion is removed circulation Sew the signal after being removed;
Demodulation module, is demodulated for the signal after described removal is carried out OFDM demodulation After signal;
Balance module, for carrying out after frequency domain equalization is equalized to the signal after described demodulation Signal;
Inverse discrete fourier transformed module, inverse discrete for the signal after described equilibrium is carried out Fourier transform obtains output signal;
Wherein, also include:
Output selects module, is used for choosing whether to bypass described balance module and described against discrete Fourier transform module, and the signal after described demodulation is directly exported.
Receiver the most according to claim 7, it is characterised in that described output selects Module is additionally operable to:
-receive the instruction information from base station;
-carry out described selection according to described instruction information.
9. one kind receives signal in the subscriber equipment of LTE-TDD cellular radio Communication system Method, including:
M. the signal that wireless signal obtains receiving is received;
N. the described signal received is carried out the signal after analog digital conversion obtains analog digital conversion;
O. the signal after described analog digital conversion is removed the signal after Cyclic Prefix is removed;
Signal after the most described removal carries out the signal after OFDM demodulation is demodulated;
Signal after the most described demodulation carries out the signal after frequency domain equalization is equalized;
Signal after the most described equilibrium carries out inverse discrete fourier transformed and obtains output signal;
Wherein, also included before described step q:
S. choose whether to bypass described step q and described step r and by the letter after described demodulation Number direct output.
Method the most according to claim 9, it is characterised in that described step s is also wrapped Include:
-receive the instruction information that base station sends;
-carry out described selection according to described instruction information.
CN201210215565.2A 2012-06-27 2012-06-27 The method and apparatus of device-to-device communication CN103517275B (en)

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