CN101035102A - Orthogonal frequency division multiplexing signal transmitting method for reducing the inter-cell interference - Google Patents

Orthogonal frequency division multiplexing signal transmitting method for reducing the inter-cell interference Download PDF

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Publication number
CN101035102A
CN101035102A CNA2006100516006A CN200610051600A CN101035102A CN 101035102 A CN101035102 A CN 101035102A CN A2006100516006 A CNA2006100516006 A CN A2006100516006A CN 200610051600 A CN200610051600 A CN 200610051600A CN 101035102 A CN101035102 A CN 101035102A
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district
division multiplexing
ofdm
frequency division
carrier
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黎海涛
李继峰
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Priority to CNA2006100516006A priority Critical patent/CN101035102A/en
Priority to PCT/JP2007/054297 priority patent/WO2007102492A1/en
Publication of CN101035102A publication Critical patent/CN101035102A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/023—Multiplexing of multicarrier modulation signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload

Abstract

The present invention provides a method of OFDM signal transmission using for lower cellular OFDM district intersymbol interference, characterized by the adjacent edge of the area using different duration of time domain pulse OFDM signal, and its inverse Fourier transform, as the carrier frequency in the appearance of a peak, the other carrier in the low frequency range at the peak within 3 dB. In this way, through OFDM the design of domain pulse signal waveform launches inter-district carrier waveform differences and orthogonal. When a district-carrier distribution changes, the district does not require adjustment other carrier. At the same time, using the of the different characteristics of launch wave pulse duration to deal with the users in the same district, the short duration of the pulse allocated to the high-speed users, the pulse lasted for a long time allocated to the low-rate users. As a result, businesses can support multi-rate, and when a user rate changes, only need to change adjustments allocated to the user's carrier, reduce system complexity.

Description

Reduce the orthogonal frequency division multiplexing signal transmitting method of presence of intercell interference
Technical field
The present invention relates to the wireless messages transmission field, particularly adopt the information transmission system such as WLAN (wireless local area network), fixed wireless access, mobile communication, ground digital television broadcast of OFDM (OFDM) technology.More particularly, the present invention relates to a kind of OFDM (OFDM) signal transmitting method that reduces presence of intercell interference.
Background technology
Along with the fusion gradually of wireless network, multimedia technology and internet, people are more and more higher to the requirement of the type of radio communication service and quality.For satisfying the requirement of radio multimedium and high speed data transfers, need the Development of New Generation wireless communication system, and it will extensively adopt some new technologies, as OFDM (OFDM), many antennas (MIMO) etc.
OFDM is divided into many orthogonal sub-channels to channel at frequency domain; whole wideband frequency selective channel is divided into the subchannel of relatively flat; simultaneously, insert Cyclic Prefix (CP) as protection interval (GI), reduced intersymbol interference (ISI) greatly at each OFDM intersymbol.At present, in the Long Term Evolution plan (LTE) of 3G (Third Generation) Moblie standardization body (3GPP), the OFDM technology as down (on) the critical transmissions technology of line link.
If OFDM is used for cell mobile communication systems, need to support that the multi-user inserts.Existing access mode all can be used for ofdm system as time division multiple access (TDMA), frequency division multiple access (FDMA), code division multiple access (CDMA).The mixing multiple access technology OFDMA-TDMA that adopts OFDM (OFDMA) to combine with TDMA has the advantage of the two, it can be different user dynamic assignment carrier wave in each time slot, meticulous, time-frequency resource allocating flexibly is provided, can have obtained multi-user diversity gain.This technology has been applied to the novel wireless communication system based on OFDM, in broadband wireless access IEEE 802.16 standards and the IEEE802.20 standard based on Flash-OFDM.In some motions of 3GPP LTE, also OFDMA-TDMA as basic transmission means.
In the cellular OFDM system; when user terminal transmits multimedia, visual telephone business; require low time delay and low grouping (packet) loss ratio; and the user terminal that is positioned at cell edge is influenced by the co-channel interference of channel shadow fading and other cell signals easily, and the quality regular meeting of its transport service reduces.For reducing the interference of minizone, adopted the method for giving neighbor cell allocation different carrier piece in some LTE motions, this needs to carry out frequency planning according to the used carrier block in each sub-district earlier.If the used carrier wave in a certain sub-district changes, then need the carrier wave of all neighbor cells is reconfigured, implementation complexity is higher.Simultaneously, when user terminal was positioned at cell edge, adjacent base station multi-antenna signal radiation pattern can bring more serious cochannel to disturb.For improving the transport service quality, the present invention proposes the method by emission OFDM orthogonal waveforms, realizes reducing the purpose of disturbing between neighbor cell.
The list of references tabulation:
[1]3GPP?R1-050590，NTT?DoCoMo，Physical?channels?andmultiplexing?in?evolved?UTRA?downl?ink，RAN1?Ad?Hoc?on?LTE
[2]3GPP?R1-050591，NTT?DoCoMo，Physical?channels?andmultiplexing?in?evolved?UTRA?uplink，RAN1?Ad?Hoc?on?LTE
Summary of the invention
The object of the present invention is to provide a kind of method that reduces the presence of intercell interference of cellular OFDM system.
In general ofdm system, reduce to disturb by giving the neighbor cell allocation different carrier frequencies, when the carrier wave of a sub-district changed, the carrier wave that need carry out the every sub-district of cellular system in real time reconfigured, and complexity is higher.
For addressing the above problem, the present invention proposes a kind of OFDM transmitted waveform, adjacent each cell edge adopts the time domain impulsive signals of various durations, and its frequency domain carrier signal behind contrary Fourier transform has following feature: at the peak value place of a certain carrier wave, other carrier waves secondary lobe then occurs and cross the 3dB that zero frequency or amplitude are lower than peak value.
Like this, each community user signal after IFFT modulation, the orthogonality of sub-district internal cause IFFT modulation and can keep the orthogonality of its carrier wave, simultaneously, between the sub-district because of the aforementioned feature of this waveform, also keep quadrature and make disturb lower.
Further, utilize the different feature of pulse duration of this transmitted waveform, propose a kind of many speed OFDM transmission plan.In general ofdm system, obtain different rates by the carrier number of adjusting OFDM, the complexity height that this dynamic carrier changes.Redistribute the complexity of bringing for reducing carrier wave, the present invention proposes, and this transmitted waveform is applied in the same sub-district, and gives high rate user short pulse distribution of duration, and the pulse distribution of longer duration is given low-rate users.Because the pulse duration difference, so the transmission rate difference can be supported the multimedia service of different rates requirement, and these waveforms keep quadrature after the IFFT conversion, so can realize not disturbing mutually between the user.When a certain user's rate variation, only need adjust the carrier number of distributing to this user, and need not to change other users' allocation of carriers situation.With compare under the aforementioned general OFDM situation, reduced implementation complexity.
Description of drawings
Below with reference to accompanying drawings, the preferred embodiments of the present invention are described in detail, wherein:
Fig. 1 shows the example of honeycomb multiple-input and multiple-output (MIMO) system;
Fig. 2 shows the schematic diagram of OFDM transmit-receive unit;
Fig. 3 show in the sub-district between the schematic diagram of an example disturbing;
Fig. 4 shows the schematic diagram of general OFDM allocation of carriers;
Fig. 5 shows the schematic diagram of many sub-districts OFDM carrier wave dynamic-configuration;
Fig. 6 shows the schematic diagram of the applied many sub-districts of the present invention OFDM transmitted waveform;
Fig. 7 A shows the schematic diagram according to an example of OFDM carrier wave configuration of the present invention;
Fig. 7 B shows the flow chart according to OFDM carrier wave collocation method of the present invention;
Fig. 8 shows the schematic diagram of MIMO OFDM transmit-receive unit;
Fig. 9 A shows the schematic diagram that many speed of the present invention is used; And
Fig. 9 B shows the flow chart of the OFDM carrier wave collocation method under many speed applicable cases.
Embodiment
Below in conjunction with accompanying drawing the present invention is specified.Be noted that described embodiment only is for illustrative purposes, rather than limitation of the scope of the invention.Described various numerical value is not to be used to limit the present invention, and these numerical value can carry out any suitable modification according to those of ordinary skills' needs.
Fig. 1 shows the example of honeycomb mimo system.As shown in Figure 1, many sub-districts ofdm system adopts the hexagon honeycomb shape usually, and six neighbor cells are arranged around each sub-district, and each base station covers a sub-district, is positioned between the user terminal of respective cell and base station to communicate.
Generally speaking, the OFDM mode is adopted to the downlink transmission of user terminal in the base station.Fig. 2 shows the schematic diagram of OFDM transmit-receive unit.Emitter is shown in Fig. 2 (a), the encoded modulation module 201 of incoming bit stream carries out chnnel coding, symbol-modulated, IFFT module 202 is carried out the IFFT modulation to sign map to the carrier wave end then, adds CP module 203 and arrive channel by antenna transmission after inserting Cyclic Prefix behind the IFFT output symbol.Receiving system is shown in Fig. 2 (b), and received signal is through shifting out CP module 204 deletion Cyclic Prefix, and is input to FFT module 205 and carries out the FFT demodulation, and 206 pairs of symbols streams of demodulation coding module are carried out demodulation, bit stream is recovered in the decoding back.
Below, will in conjunction with Fig. 3 in the sub-district/interference makes an explanation.Fig. 3 shows in the sub-district/disturb example.When the user is positioned at cell edge, the signal strength signal intensity that receives a little less than, be subjected to simultaneously disturbing in the sub-district that this community user brings and presence of intercell interference that neighbor cell brings.With reference to figure 3, the user terminal 1 in the A sub-district is positioned at the edge with sub-district B, and it is subjected to from the interior user terminal 3 in zone that disturbs in the sub-district of user terminal 2 and base station B covers, the presence of intercell interference that the user terminal 4 in the zone that base station C covers brings.
Fig. 4 shows general OFDM allocation of carriers.In general ofdm system, reduce to disturb by giving the neighbor cell allocation different carrier frequencies.Fig. 4 (a) represents the OFDM carrier waveform that sample obtains after the IFFT conversion; Fig. 4 (b) represents all carrier waves of the OFDM symbol that several samples obtain after the IFFT conversion, each carrier wave maintenance orthogonality and amplitude are identical.
Fig. 5 shows the schematic diagram of many sub-districts OFDM carrier wave dynamic-configuration.During allocation of carriers, eliminate, give the different carrier wave of every cell allocation for the orthogonality of utilizing carrier wave.If 2 carrier waves of every cell allocation, carrier wave f1～f2 distributes to the user in the A sub-district, and carrier wave f3～f4 distributes to the user in the B sub-district, and by that analogy, carrier wave f13～f14 distributes to the user (referring to Fig. 1) in the G sub-district.If the A sub-district requires more carrier wave under certain condition, for example, need all distribute to this sub-district to f1～f3 carrier wave, be used for the A sub-district owing to be used for the carrier wave f3 of B sub-district originally, and then need have redistributed sub-district B, C ... the carrier wave of G is to guarantee the orthogonality of each cell carrier.As seen, when the carrier wave of a sub-district changed, needs reconfigured the carrier wave of cellular system neighbor cell in real time, and complexity is higher.
Fig. 6 shows the schematic diagram of the applied many sub-districts of the present invention OFDM transmitted waveform.According to the present invention, the problems referred to above have been solved well.The applied OFDM transmitted waveform of the present invention is characterised in that: the time domain impulsive signals of various durations is adopted in adjacent each sub-district, and its frequency domain carrier signal quadrature behind contrary Fourier transform, promptly at the peak value place of a certain carrier wave, the 3dB that secondary lobe is crossed zero frequency or is lower than peak value then appears in other carrier waves.Consider A, B, three neighbor cells of C, A cell edge adopt I class pulse signal, its each sample and the carrier wave after the IFFT conversion such as Fig. 6 (a); The B cell edge adopts II class pulse signal, and its each sample and the carrier wave after the IFFT conversion such as Fig. 6 (b), C cell edge adopt III class pulse signal, its each sample and the carrier wave after the IFFT conversion such as Fig. 6 (c).Adopt identical duration pulsion phase relatively with all sub-districts of general cellular OFDM, difference is, the duration difference of each sub-district pulse.And these pulses are after the IFFT conversion, and its characteristics are, at the honeybee value place of a certain carrier wave, the amplitude of other carrier waves be zero or amplitude be lower than the 3dB of peak value.Fig. 6 (d) shows three results after the cell carrier stack, this shows that these carrier waves also keep orthogonality relation.Simultaneously, owing to these cell carriers are come through the IFFT conversion by mutually different pulse, so they are independent of each other, promptly the allocation of carriers of a sub-district does not influence the allocation of carriers of other sub-districts.
Fig. 7 A shows the schematic diagram according to OFDM carrier wave ios dhcp sample configuration IOS DHCP of the present invention.Suppose that original A cell edge adopts I class waveform, carrier wave is f1～f2, the B cell edge adopts II class waveform, carrier wave is f3～f4, the C cell edge adopts III class waveform, and carrier wave is f5～f6, the orthogonality of sub-district internal cause IFFT modulation and can keep the orthogonality of its carrier wave, between the sub-district because of the aforementioned feature of this waveform, also keep " class quadrature " and make disturb lower.When A sub-district emission carrier number changed, if f1～f3, B, C cell carrier were not influenced by it, can be f3～f4 and f5～f6 equally, promptly need not other cell carriers are reconfigured.Its principle is as follows:
If k sample signal of i sub-district emission is
Figure A20061005160000081
t iBe the sample duration, this signal is carried out can obtaining after the IFFT conversion OFDM symbol shown in following expression (1)
x i ( t ) = IFFT ( X i [ k ] rect ( t t i ) ) - - - ( 1 )
Can further expression formula (1) be written as following expression (2)
x i ( t ) = 1 T u , i Σ k = 0 K - 1 X i [ k ] exp [ j 2 π k ( t - T g , i ) T u , j ] rect ( t T i ) , i = 1,2 , · · · , I - - - ( 2 )
Here, rect ( t T i ) = 1 0 &le; t < T i 0 other Expression OFDM symbol duration function, T iRepresent that the whole duration (comprises IFFT data duration T U, iWith protection gap periods T G, i).For different districts, because of each sample duration t iDifference is so make IFFT data duration T after the IFFT conversion to K sample U, iAlso inequality.Correspondingly, each carrier bandwidths &Delta; f i = 1 T u , i Also inequality.And for general cellular OFDM system, the carrier bandwidths Δ f of every sub-district is all identical, and its OFDM symbol is by following expression (3) expression,
x i ( t ) = 1 T u &Sigma; k = 0 K - 1 X i [ k ] exp [ j 2 &pi; k ( t - T g ) T u ] rect ( t T ) , i = 1 , 2 , &CenterDot; &CenterDot; &CenterDot; , I - - - ( 3 )
Here, whole OFDM symbol duration T, IFFT data duration T uWith protection gap periods T gAll identical to all sub-districts.
Simultaneously, said method also can be used for many antennas (MIMO) system.Mimo system is meant and is sending and receiving terminal use multi-antenna array that it can significantly improve power system capacity and wireless transmission link quality.The MIMO OFDM that MIMO combines with OFDM has both advantages, it both resolved into one group of parallel flat fading channel to frequency selectivity MIMO fading channel by the OFDM modulation, utilize MIMO to improve power system capacity again, be applicable to transmission of high-rate, high quality multimedia business.
Fig. 7 B shows the flow chart of this method: at first, in step 701, be each adjacent in cellular communication system cell allocation different carrier of frequency orthogonal each other; Afterwards, in step 702, the OFDM time domain impulsive signals that has various durations for each adjacent in cellular communication system cell allocation is as its signal of communication; And last, in step 703, in each sub-district, between base station and user terminal, transmit and receive the signal of communication that is distributed, so that communicate.
Fig. 8 shows the schematic diagram of MIMO OFDM transmit-receive unit.MIMO OFDM emitter is shown in Fig. 8 (a), the input bit code modulation module 802 that serial/parallel module 801 is input to each branch road of flowing through carries out chnnel coding, symbol-modulated, in IFFT module 803 sign map is carried out the IFFT modulation to the carrier wave end then, add CP module 804 and after inserting Cyclic Prefix behind the IFFT output symbol, arrive channel by antenna transmission.Receiving system is shown in Fig. 8 (b), and received signal is through shifting out CP module 805 deletion Cyclic Prefix, and is input to FFT module 806 and carries out the FFT demodulation, and 807 pairs of symbols streams of demodulation coding module are carried out delivering to signal detection module 808 after demodulation, the decoding and recovered bit streams.
Further, utilize the different feature of pulse duration of transmitted waveform of the present invention, proposed a kind of many speed OFDM transmission plan.In general ofdm system, obtain different rates by the carrier number of adjusting OFDM, as distributing many subcarriers to high rate user; On the contrary, when user rate hangs down, reduce this user's subcarrier.At this moment, also face the same problem when carrying out allocation of carriers for eliminating presence of intercell interference, promptly when the allocation of carriers of some user terminals changes, need adjust simultaneously the carrier wave of other users in the sub-district with the front.
Fig. 9 A shows the schematic diagram that many speed of the present invention is used.With reference to figure 9A, redistribute the complexity of bringing for reducing carrier wave, according to the present invention, OFDM transmitted waveform shown in Figure 6 is applied in the same sub-district, and high rate user is distributed in the pulse (as waveform III) that the duration is short, and low-rate users is distributed in the pulse of longer duration (as waveform I).Because pulse duration difference, corresponding carrier bandwidths difference, carrier number when the same channel bandwidth is also different, so transmission rate difference, can support the multimedia service of different rates requirement, and these waveforms keep quadrature after the IFFT conversion, so can realize not disturbing mutually between the user terminal.When a user's rate variation, only need to adjust the carrier number of distributing to this user, and need not to change other users' allocation of carriers situation.Compare with the situation of aforementioned general OFDM, reduced the implementation complexity of system.
Fig. 9 B shows the flow chart of this method: at first, and in step 901, according to the transmission rate of each user terminal in the cellular communication system, in the same sub-district, for each user terminal distributes the different carrier of frequency orthogonal each other; Afterwards, in step 902, according to the transmission rate of each user terminal in the cellular communication system, in the same sub-district, for each user terminal distributes the OFDM time domain impulsive signals with various durations, as its signal of communication; And last, in step 903, in each sub-district, between base station and user terminal, transmit and receive the signal of communication that is distributed, so that communicate.
Although illustrated and described the present invention at exemplary embodiments, will be understood by those skilled in the art that, under the situation that does not break away from the spirit and scope of the present invention, can carry out various other change, replacement and interpolations.Therefore, the present invention is not limited to above-mentioned particular instance, and should be defined by the following claims.

Claims (10)

1, a kind of orthogonal frequency division multiplexing signal transmitting method may further comprise the steps:
Be each adjacent in cellular communication system cell allocation different carrier of frequency orthogonal each other;
The OFDM time domain impulsive signals that has various durations for each adjacent in cellular communication system cell allocation is as its signal of communication;
In each sub-district, between base station and user terminal, transmit and receive the signal of communication that is distributed, so that communicate.
2, orthogonal frequency division multiplexing signal transmitting method according to claim 1, it is characterized in that described OFDM time domain impulsive signals has the peak value place at a certain carrier wave, other carrier waves secondary lobe then occurs and cross the characteristic that zero frequency or amplitude are lower than the 3dB of peak value.
3, orthogonal frequency division multiplexing signal transmitting method according to claim 1 is characterized in that directly changing the allocation of carriers of described sub-district, and need not the carrier wave of each adjacent with it sub-district is redistributed when needs change the carrier wave of a sub-district.
4,, it is characterized in that described cellular communication system is single antenna ofdm system or multi-antenna orthogonal frequency division multiplexing system according to any one the described orthogonal frequency division multiplexing signal transmitting method in the claim 1 to 3.
5, a kind of orthogonal frequency division multiplexing signal transmitting method may further comprise the steps:
According to the transmission rate of each user terminal in the cellular communication system, in the same sub-district, for each user terminal distributes the different carrier of frequency orthogonal each other;
According to the transmission rate of each user terminal in the cellular communication system, in the same sub-district, for each user terminal distributes the OFDM time domain impulsive signals with various durations, as its signal of communication;
In each sub-district, between base station and user terminal, transmit and receive the signal of communication that is distributed, so that communicate.
6, orthogonal frequency division multiplexing signal transmitting method according to claim 5 is characterized in that described OFDM time domain impulsive signals has the peak value place at a certain carrier wave, and the characteristic that secondary lobe is crossed zero frequency or is lower than the 3dB of peak value then appears in other carrier waves.
7, orthogonal frequency division multiplexing signal transmitting method according to claim 5 is characterized in that distributing more carrier wave for the higher user terminal of transmission rate.
8, orthogonal frequency division multiplexing signal transmitting method according to claim 5 is characterized in that the OFDM time domain impulsive signals with shorter duration is distributed to the higher user terminal of transmission rate.
9, according to any one the described orthogonal frequency division multiplexing signal transmitting method in the claim 5 to 8, it is characterized in that when needs change the carrier wave of a user terminal, directly change the allocation of carriers of described user terminal, and need not the carrier wave of other user terminals in the same sub-district is redistributed.
10,, it is characterized in that described cellular communication system is single antenna ofdm system or multi-antenna orthogonal frequency division multiplexing system according to any one the described orthogonal frequency division multiplexing signal transmitting method in the claim 5 to 9.
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WO2017181328A1 (en) * 2016-04-18 2017-10-26 华为技术有限公司 Interference coordination method, base station, and user equipment

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WO2017181328A1 (en) * 2016-04-18 2017-10-26 华为技术有限公司 Interference coordination method, base station, and user equipment

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