CN101505528B - Method and apparatus for using cyclic prefix time slot transmission information - Google Patents
Method and apparatus for using cyclic prefix time slot transmission information Download PDFInfo
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- CN101505528B CN101505528B CN2008100653587A CN200810065358A CN101505528B CN 101505528 B CN101505528 B CN 101505528B CN 2008100653587 A CN2008100653587 A CN 2008100653587A CN 200810065358 A CN200810065358 A CN 200810065358A CN 101505528 B CN101505528 B CN 101505528B
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Abstract
The embodiment of the invention discloses a method for transmitting information by utilizing cyclic prefix CP time slots, which comprises that: a receiving end receives signals sent by a sending end in CP time slots, and information transmitted by the sending end is acquired according to power change conditions of the signals. Aiming at the condition that the receiving end does not perform any processing on the CP time slots to cause the waste of the CP time slots in the prior art, the embodiment of the invention utilizes the characteristics that the CP time slots can transmit true cyclic prefix, and also can transmit the true cyclic prefix or preset other signals in zero power or little power, improves the utilization rate of the CP time slots and reduces the waste of the CP time slots by controlling the power of the CP time slots at the transmitting end and carrying information by utilizing the power change, and strengthens the system performance and increases the system throughput by utilizing the CP time slots.
Description
Technical field
The invention belongs to the mobile communication technology field, particularly a kind of method and apparatus that utilizes cyclic prefix time slot transmission information.
Background technology
Along with development of Communication Technique, require to improve day by day for information transmission quality.(Inter-Symbol Interference ISI), has proposed OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology in intersymbol interference during for effective antagonism high-speed transfer.OFDM is divided into many orthogonal sub-channels to channel, keeps quadrature between each subchannel, and frequency spectrum is overlapped, has improved the availability of frequency spectrum.The OFDM symbol is to extend in the cycle, and back L sample of each symbol copied to this symbol front formation Cyclic Prefix, and (Cyclic Prefix, CP), this has significantly reduced the sensitiveness of ofdm system to timing error, can resist the infringement of multidiameter delay effectively.As shown in Figure 1, back L sample of OFDM symbol copies to the symbol front end and forms CP.
With OFDM Ultra-Mobile Broadband (Ultra Mobile Broadband UMB) is applied as example in the system, and the length of CP has four kinds: 6.51 μ s, 13.02 μ s, 19.53 μ s, 26.04 μ s are corresponding to different base station ranges.
The coverage of base station varies, and big base station covers can arrive tens kilometers, and little base station covers hundreds of rice.A kind of littler base station--Femto base station has appearred now
What Femtocell (Femto cell) was primarily aimed at is to cover incomplete problem in doors, by the method improvement signal coverage varies within doors of a small-power base station is installed in doors, strengthens communication capacity in doors.From realizing that the base station of Femtocell is as broad as long with normal base station, just power is much smaller, so operating distance is usually in tens meters.
UMB system definition 4 kinds of CP, if synchro system, then the whole network uses same CP.If asynchronous system, neighbor cell CP can be different, but its shortcoming is apparent in view, can only make direct-cut operation such as terminal, can't make cell coordination or the like.
After the UMB system introduced this little base station of Femto, for the communication system that femto etc. covers among a small circle, because distance is very near, so multi-path influence was very little, and simultaneously, because distance is very near, synchronous precision also can be very high.This moment, the use of CP was little.And receiving terminal partly directly abandons for CP, therefore has waste.As shown in Figure 2, the CP length that should use of small-coverage base station only accounts for very fraction of ordinary base station CP length.
According to the model of 802.11n agreement, general indoor propagation time delay is 80-1050ns.And in the UMB system, an OFDM symbol lengths is 113.93 μ s, the duration of CP at 6.51 μ s between the 26 μ s, the length of CP be the OFDM symbol 1/16 in addition more.As seen CP partly wastes often.
With the 5M system is example.The duration of a chip is about 200ns, and maximum delay 5 chip length only, but CP partly takies the length of 32-128 chip, wastes bigger.
Summary of the invention
The embodiment of the invention provides a kind of method and apparatus that utilizes cyclic prefix time slot transmission information, by the utilization to cyclic prefix time slot, has improved the utilance of CP time slot, has reduced the waste of CP time slot.
The embodiment of the invention provides a kind of method of utilizing cyclic prefix time slot transmission information, and this method comprises:
Transmitting terminal is chosen in the CP time slot and carries out total power transmission or zero energy transmission or small-power transmission according to the content of information to be transmitted, wherein, at least two continuous or discontinuous CP time slots is bound, and the transmitted power of the CP time slot of described binding is identical;
The receiving terminal receiving end/sending end obtains the transmitting terminal information transmitted at the signal that the CP time slot sends according to the situation of change of this signal power.
The embodiment of the invention also provides a kind of transmitting terminal, comprising:
The power setting unit is used for according to the information content waiting for transmission, sets the transmitted power of cyclic prefix CP time slot signal; Described transmitted power is total power or zero energy or small-power;
Time slot binding unit is used at least two continuous or discontinuous CP time slots are bound, and the transmitted power of the CP time slot of described binding is identical;
Signal transmitting unit is used for the set point according to the output of described power setting unit, sends signal at the CP time slot.
Do not do any processing at receiving terminal in the prior art for the CP time slot, thereby cause the situation of CP time slot waste, the embodiment of the invention utilizes the CP time slot can transmit real Cyclic Prefix, also can zero energy or minimum power send the characteristics of real Cyclic Prefix or default other signals, by the power of CP time slot being controlled, utilize the variation of power to carry information at transmitting terminal.Improved the utilance of CP time slot, reduced the waste of CP time slot, and by the utilization to the CP time slot, the enhanced system performance increases throughput of system.
Description of drawings
The OFDM schematic symbol diagram that ordinary base station should send in Fig. 1 prior art;
The OFDM schematic symbol diagram that small-coverage base station should send in Fig. 2 prior art;
Schematic diagram one when the CP time slot adopts part power or inactivity to send in Fig. 3 embodiment of the invention;
Schematic diagram two when the CP time slot adopts part power or inactivity to send in Fig. 4 embodiment of the invention;
Schematic diagram three when the CP time slot adopts part power or inactivity to send in Fig. 5 embodiment of the invention;
Utilize the schematic diagram of the variable power indication binary message of CP time slot in Fig. 6 embodiment of the invention;
CP time slot binding schematic diagram in Fig. 7 embodiment of the invention;
Utilize the schematic diagram of the variable power indication multi-system information of CP time slot in Fig. 8 embodiment of the invention.
Embodiment
For make embodiment of the invention purpose, technical scheme and advantage clearer, understand, below with reference to accompanying drawing, the embodiment of the invention is described in detail:
At first, this programme utilizes that the CP time slot can transmit real Cyclic Prefix in the OFDM symbol, also can send with zero energy or minimum power, obtains the end information of making an uproar.
Transmitting terminal utilizes the variable power of CP time slot in the OFDM symbol to carry information.Such as, when sending CP with complete (expiring) power, expression binary message " 1 ", when sending CP with part power or inactivity, expression binary message " 0 "; Perhaps, when sending CP with full power, expression binary message " 0 ", when sending CP with part power or inactivity, expression binary message " 1 ".In order to narrate conveniently, hereinafter all send and be expressed as " 1 " with full power, part power or inactivity (small-power) send expression " 0 " and illustrate that this does not constitute any restriction to the embodiment of the invention.When the CP time slot adopts full power to send the OFDM symbol, its send mode is the same with the ordinary base station send mode, uses with the same CP slot length of ordinary base station, as shown in Figure 1, the signal that is sent can be real Cyclic Prefix, also can be other signals of presetting.Can use three kinds of modes to send when the CP time slot adopts transmission of part power or inactivity to send, the signal that the CP time slot is sent can be real Cyclic Prefix, also can be other signals of presetting:
First kind of mode, send mode is the same with the ordinary base station send mode, uses with the same CP slot length of ordinary base station, sends but the transmitting power in the whole C P time slot is starkly lower than full power, the signal that is sent can be real Cyclic Prefix, also can be other signals of presetting.As shown in Figure 3.
The second way, send mode is the same with the ordinary base station send mode, use with the same CP slot length of ordinary base station, the signal that is sent can be real Cyclic Prefix, also can be other signals of presetting, but partly use full power to send for the CP time slot that small-coverage base station should use, and remainder use low-power to send.As shown in Figure 4.
The third mode and the second way are similar, but the signal of the signal that full power is partly transmitted and partial low-power transmission can be independent, partial low-power even can not pass any signal, as shown in Figure 5.
Binary message is carried by said method in the base station in CP.As shown in Figure 6, the transmission of CP time slot uses total power, receiving terminal to receive the power (energy) of judging its CP time slot behind this OFDM symbol in first OFDM symbol.A power detecting method commonly used is: make relevant treatment with a known signal and the signal of receiving, the correlation that obtains promptly can be thought performance number, when remaining real Cyclic Prefix such as the signal of CP part, receiving terminal can find the known signal of CP time slot section correspondence with the ofdm signal that detection obtains, and does relevant getting final product then with at the corresponding signal of receiving of CP time slot.Described known signal both can be predefined, also can be the CP signal that detected ofdm signal should generate according to existing C P generating mode.If detecting the power obtain surpasses a threshold T and then thinks this CP time slot indication binary message " 1 "; In second OFDM symbol, the CP time slot sends with minimum power or zero energy, and its CP energy of judgement was less than threshold T after receiving terminal was received this OFDM, and then this CP time slot is indicated binary message " 0 ".Like this in three continuous OFDM symbols, example shown in Figure 6 utilizes three CP time slots ' 101 ' of can carrying binary message.And the like, can utilize the more CP time slot indication more information of multi-OFDM symbol.For example, a General Physics frame comprises 8 OFDM symbols in the UMB system, the binary message of utilizing the CP time slot of 8 OFDM symbols then can carry 8 bits like this.Here the threshold value that relates to can preestablish, and also can dynamically adjust, and the detected value that the detected value that obtains such as the CP time slot with the low-power that detected or zero energy or the test frame of mourning in silence obtain is revised existing thresholding.
Each superframe comprises a previous video frames and 25 frame General Physics frames.Thereby a superframe comprises 8 * 25=200 CP time slot.Utilize all or part of in these 200 CP time slots to come transmission information, ideally can carry 200 bit informations.Consider the detection error, a plurality of CP time slots can be bound.When sending such as the use binary code, can set a plurality of CP time slots and carry a bit information, with a plurality of CP time slot energy additions or multiply by a weight addition separately, surpass and set thresholding and then be judged to " 1 " when detecting, be lower than and set thresholding and then be judged to " 0 ".For example with bit information of 2 CP time slot indications, can carry 100 bit informations this moment.As shown in Figure 7, transmitting terminal is the emission of CP full power in first, second OFDM symbol, three, CP utmost point low power transmissions in the 4th OFDM symbol, receiving terminal is first, the CP energy of receiving in second OFDM symbol merges the heel threshold T relatively, if greater than this threshold value, think that then the CP time slot of the first, the second OFDM symbol carries a binary bits information " 1 ".As a same reason, receiving terminal merges the heel threshold T to the CP energy of receiving in the three, the four the OFDM symbol relatively, if be lower than this threshold value, judges that then the CP time slot of the three, the four OFDM symbol carries binary bits information " 0 ".Two CP time slots being bound can continuously also can be discontinuous.
Further, can from the total power to the zero energy, (consider the scope of power amplifier to the CP time slot power, zero energy and minimum power are equal to) scope quantizes to be divided into a plurality of sections, by the CP time slot power being arranged on different power sections to carry a plurality of binary messages or multi-system information.As shown in Figure 8, in the OFDM symbol, the CP time slot power is divided into the N section from the full power to the zero energy, then portability log
2N binary message.Receiving terminal is by more then obtaining the corresponding information of this CP time slot to the CP time slot section power that receives with N-1 threshold value.
For the correctness that guarantees to transmit, can encode to the information of CP time slot indication at transmitting terminal, interweave, processing such as scrambling to improve the receiving terminal reliability, no longer do being described in detail here.These utilize the information of CP time slot section indication can be used to carry system broadcast information or multicast speech breath or control information, also can carry transmitting user data.
In order to support such scheme, system need increase parameter and indicate the usage of broadcasting the CP time slot, includes but not limited to how the power of CP slot transmission quantizes, the setting of CP time slot binding, whether uses whole CP time slots or the like content.This indication can be carried in broadcast channel or control channel, also can be that system default or the information of utilizing set CP time slot to carry are transmitted.
If the CP slot transmission is user data, needs to increase new assignment message and notify terminal how to use this resource.
If different CP is used in adjacent base station, must face synchronous problem, can be configured to use that bigger CP so, but the CP that covers that little sub-district can partly transmit data.
The embodiment of the invention provides a kind of receiving terminal that utilizes cyclic prefix time slot transmission information.This receiving terminal can be integrated in the base station, also can be integrated in the terminal.This receiving terminal comprises:
Receiving element is used for the signal that receiving end/sending end sends at the cyclic prefix CP time slot;
Detect judging unit, be used to detect the power of the signal of the CP time slot that described receiving element receives, and testing result and threshold value are compared judgement,, then be judged as " 1 " greater than this threshold value,, then be judged as " 0 " less than this threshold value; Perhaps, be judged as during greater than this threshold value " 0 ", be judged as during less than this threshold value " 1 ";
Information acquisition unit according to the judged result of described detection judging unit output, is obtained the transmitting terminal information transmitted.
The embodiment of the invention also provides a kind of transmitting terminal that utilizes cyclic prefix time slot transmission information.This transmitting terminal can be integrated in the base station, also can be integrated in the terminal.This transmitting terminal comprises:
The power setting unit is used for according to the information content waiting for transmission, sets the transmitted power of cyclic prefix CP time slot;
Signal transmitting unit is used for the power according to the set point of described power setting unit output, sends at the CP time slot.
Further, this transmitting terminal also comprises:
Time slot binding unit is used at least two continuous or discontinuous CP time slots are bound, and the transmitted power of the CP time slot of described binding is identical.
The code interleaving scrambling unit, be used for described information to be transmitted encode, interweave, scrambling handles.
By the technical scheme that the embodiment of the invention provides, can improve the utilance of CP time slot, reduce the waste of CP time slot, and by the utilization to the CP time slot, the enhanced system performance increases throughput of system.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential hardware platform, can certainly all implement, but the former is better execution mode under a lot of situation by hardware.Based on such understanding, all or part of can the embodying that technical scheme of the present invention contributes to background technology with the form of software product, this computer software product can be stored in the storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (6)
1. a method of utilizing the cyclic prefix CP time slot transmission information is characterized in that, this method comprises:
Transmitting terminal is chosen in the CP time slot and carries out total power transmission or zero energy transmission or small-power transmission according to the content of information to be transmitted, wherein, at least two continuous or discontinuous CP time slots is bound, and the transmitted power of the CP time slot of described binding is identical;
Receiving terminal receives described transmitting terminal at the signal that the CP time slot sends, and obtains described transmitting terminal information transmitted according to the situation of change of this signal power.
2. the method for claim 1 is characterized in that, described situation of change according to power is obtained described transmitting terminal information transmitted and is:
Described receiving terminal detects the signal power that receives at the CP time slot, and testing result and default threshold value are compared judgement, is judged as during greater than this threshold value " 1 ", is judged as during less than this threshold value " 0 "; Perhaps, be judged as during greater than this threshold value " 0 ", be judged as during less than this threshold value " 1 ";
According to judged result, obtain described transmitting terminal information transmitted.
3. the method for claim 1 is characterized in that, at described transmitting terminal, with described information to be transmitted encode, interweave, scrambling handles.
4. method as claimed in claim 3 is characterized in that, described information to be transmitted comprises: system broadcast message or multicast message or control information or user data.
5. a transmitting terminal is characterized in that, comprising:
The power setting unit is used for according to the information content waiting for transmission, sets the transmitted power of cyclic prefix CP time slot signal, and described transmitted power is total power or zero energy or small-power;
Time slot binding unit is used at least two continuous or discontinuous CP time slots are bound, and the transmitted power of the CP time slot of described binding is identical;
Signal transmitting unit is used for the set point according to the output of described power setting unit, sends signal at the CP time slot.
6. a kind of transmitting terminal as claimed in claim 5 is characterized in that, also comprises:
The code interleaving scrambling unit, be used for described information to be transmitted encode, interweave, scrambling handles.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100653587A CN101505528B (en) | 2008-02-05 | 2008-02-05 | Method and apparatus for using cyclic prefix time slot transmission information |
| PCT/CN2009/070250 WO2009092336A1 (en) | 2008-01-21 | 2009-01-21 | Method and apparatus for transmitting information by using cyclic prefix time slots |
| US12/840,675 US20100284298A1 (en) | 2008-01-21 | 2010-07-21 | Method and Apparatus for Transmitting Information by Using Cyclic Prefix Timeslots |
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| CN2008100653587A CN101505528B (en) | 2008-02-05 | 2008-02-05 | Method and apparatus for using cyclic prefix time slot transmission information |
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| CN1993955A (en) * | 2004-06-04 | 2007-07-04 | 高通股份有限公司 | Wireless communication system with configurable cyclic prefix length |
| CN101076002A (en) * | 2006-05-17 | 2007-11-21 | 大唐移动通信设备有限公司 | Method and apparatus for acquiring circulating prefix-length information |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1993955A (en) * | 2004-06-04 | 2007-07-04 | 高通股份有限公司 | Wireless communication system with configurable cyclic prefix length |
| CN101076002A (en) * | 2006-05-17 | 2007-11-21 | 大唐移动通信设备有限公司 | Method and apparatus for acquiring circulating prefix-length information |
Non-Patent Citations (1)
| Title |
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| 王建平.通信原理.《通信原理》.人民邮电出版社,2007,68-71. * |
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