CN104519004A - Method of forming position patterns of reserved subcarriers of NGB-W (Next Generation Broadcasting-Wireless) system - Google Patents

Method of forming position patterns of reserved subcarriers of NGB-W (Next Generation Broadcasting-Wireless) system Download PDF

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CN104519004A
CN104519004A CN201310446642.XA CN201310446642A CN104519004A CN 104519004 A CN104519004 A CN 104519004A CN 201310446642 A CN201310446642 A CN 201310446642A CN 104519004 A CN104519004 A CN 104519004A
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carrier
pilot
preserved sub
sub
ngb
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CN104519004B (en
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杨程
王晓妮
芮赟
寇亚军
李明齐
缪军
封松林
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Shanghai Advanced Research Institute of CAS
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Shanghai Advanced Research Institute of CAS
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H04L27/262—Reduction thereof by selection of pilot symbols
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a method of forming position patterns of reserved subcarriers of an NGB-W (Next Generation Broadcasting-Wireless) system. Each physical frame in the NGB-W system comprises signaling symbols, data symbols and frame tail symbols, and each kind of symbols is provided with different pilots. The signaling symbols include signaling pilots. The data symbols include scattered pilots, edge pilots and continuous pilots. The frame tail symbols include edge pilots and frame tail pilots. The method comprises the following steps that the positions of the reserved subcarriers are selected from the non-pilot positions of the signaling symbols, the data symbols and the frame tail symbols, wherein positions of the scattered pilots and the continuous pilots, positions three subcarriers right to the continuous pilots, positions six subcarriers right to the continuous pilots, positions nine subcarriers right to the continuous pilots, positions of the edge pilots, and positions of 12 subcarriers on each left edge of the two sub bands of the NGB-W system are removed from the data symbols. According to the method, an effect of reducing PAPR (Peak to Average Power Ratio) can be well achieved by occupying 1% of subcarriers only.

Description

The formation method of the preserved sub-carrier position pattern of NGB-W system
Technical field
The present invention relates to mobile communication technology field, particularly relate to the communication means technical field of digital multimedia radio broadcasting, be specially a kind of formation method utilizing preserved sub-carrier to reduce the preserved sub-carrier position pattern of the NGB-W system of OFDM symbol Peak-Average-Power Ratio method.
Background technology
Along with the fast development of World Economics culture, the demand of mobile subscriber to information service increases fast.Independent dependence traditional broadcast net or traditional bi-directional communication network, all cannot realize the optimize transmissions of mobile message business.And Next generation broadcasting network wireless (NGB-W) communication system, can realize the amalgamation and coexistence of radio broadcasting and two-way communication, be solve the effective way that mobile message business datum amount increases contradiction between wireless network transmissions capacity constraint fast.NGB-W system is the multi-carrier communications systems based on OFDM technology.
In multicarrier system, especially in ofdm system, because OFDM symbol is formed by stacking by the sub-carrier signal of multiple independence through ovennodulation, when each sub-carrier phase is identical or close, superposed signal just can be subject to the modulation of identical initial phase signal, thus produce larger instantaneous power peak value, bring higher papr (PAPR-Peak to Average Power Ratio) thus further, be called for short peak-to-average force ratio (PAPR).Dynamic range due to general power amplifier is all limited, so the ofdm signal very easily ingoing power amplifier nonlinearity region that peak-to-average force ratio is larger, signal is caused to produce nonlinear distortion, obvious spread spectrum is caused to disturb and inband signaling distortion, cause whole system performance degradation, the major technique that high peak-to-average power ratio has become OFDM hinders.
At present, the technical scheme solving signal height PAPR problem mainly contains two kinds: amplifier linearisation technology and PAPR reduction technology.Linearization technique does pre-distortion compensated to non-linear caused by amplifier in base band, and its realization has higher cost and complexity.Conventional PAPR reduces technology and comprises 3 kinds: distorted signals technology, coding techniques and signal scrambling technique.Distorted signals technology realizes PAPR by signal peak amplitude limiting processing and reduces, but can introduce the nonlinear distortion of signal; Coding techniques, by designing special forward error correction code character, make code signal have lower PAPR, but the cost that this technology is paid is reduction of the transmission rate of system; Signal scrambling technique is then utilize the scrambling respectively of several special sequence pair signal, then selects the sequence with minimum PAPR and transmits.Can find out, these technology respectively have pluses and minuses: the complexity of hard-limiting and filtering class technology is low, but compare with class technology of encoding with scrambling, BER poor performance; The system complexity of selected mapping method and partial transmission sequence technology is high; And the bandwidth efficiency of class technology of encoding is low.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of formation method of preserved sub-carrier position pattern of NGB-W system, for solving the too high problem of existing NGB-W system time-domain signal Peak-Average-Power Ratio, improve the power amplification efficiency of making a start.
For achieving the above object and other relevant objects, the invention provides a kind of formation method of preserved sub-carrier position pattern of NGB-W system, be applied in NGB-W system, in NGB-W system, each physical frame comprises signaling symbols, data symbol and postamble symbol, and often kind of symbol has respective different pilot tone; Signaling symbols comprises signaling pilot tone; Data symbol comprises scattered pilot, edge pilot and continuous pilot; Postamble symbol comprises edge pilot and postamble pilot tone; The transmission band of NGB-W system is divided into two subbands in left and right, and all pilot tones distribute identical on the subband of two, left and right, and described method comprises: the position selecting preserved sub-carrier in the non-pilot position of signaling symbols, data symbol and postamble symbol; Wherein, remove scattered pilot in data symbol again, continuous pilot, continuous pilot move to right position that 3 subcarriers obtain, continuous pilot moves to right position that 6 subcarriers obtain, continuous pilot move to right position that 9 subcarriers obtain, the position of edge pilot, position after each 12 sub-carrier positions of NGB-W system two subband left hand edges.
Preferably, in signaling symbols, the mode of the position of preserved sub-carrier is selected to be: the effective sub-carrier positions after removing signaling pilot frequency locations forms the selection space of preserved sub-carrier, go out the preserved sub-carrier position of effective total number of sub-carriers 1% number at described selection space search, get and can construct the minimum preserved sub-carrier indexed set corresponding to time domain class pulse signal of minor peaks.
Preferably, scattered pilot position is along with the increase circulation change of data symbol index; Edge pilot and continuous pilot position do not change with the increase of data symbol index; Scattered pilot comprises scattered pilot PP1 ~ scattered pilot PP8; The pilot density of scattered pilot PP1 is maximum, and the search volume under scattered pilot PP1 pattern is the subset of search volume under other scattered pilot types, and the preserved sub-carrier collection searching for out under scattered pilot PP1 also belongs to the search volume under other scattered pilot types; Under scattered pilot PP1, select to determine that the mode of the position of preserved sub-carrier is in data symbol:
The scattered pilot of first data symbol in removing NGB-W frame, continuous pilot index, continuous pilot moves to right the index that 3 subcarriers obtain, continuous pilot moves to right the index that 6 subcarriers obtain, continuous pilot moves to right the index that 9 subcarriers obtain, edge pilot index, after each 12 sub-carrier indices of NGB-W system two subband left hand edges, form preserved sub-carrier index space, preserved sub-carrier index space searches out the preserved sub-carrier position of effective preserved sub-carrier sum 1% number, get and can construct the minimum preserved sub-carrier indexed set corresponding to time domain class pulse signal of minor peaks.
Preferably, in postamble symbol, the mode of the position of preserved sub-carrier is selected to be: the preserved sub-carrier search volume in signaling symbols is the subset of postamble symbol preserved sub-carrier search volume, and the preserved sub-carrier indexed set of signaling symbols is also as the preserved sub-carrier indexed set of postamble symbol.
Preferably, for signaling symbols and postamble symbol, under SISO pattern or MIXO pattern, the concrete index value of preserved sub-carrier indexed set is in table 1:
Table 1
Preferably, for data symbol, under SISO pattern or MIXO pattern, the concrete index value of preserved sub-carrier indexed set is in table 2:
Table 2
As mentioned above, the formation method of the preserved sub-carrier position pattern of NGB-W system provided by the invention, has following beneficial effect:
1, the present invention is directed to NGB-W system carry out the selection of preserved sub-carrier position and provide the result of selection, in the present invention, the regioselective result of preserved sub-carrier can construct the time domain class pulse signal close to time domain impulse signal, with this signal, peak clipping process is carried out to transmission signal, thus reach the object reducing OFDM symbol Peak-Average-Power Ratio.
2, in the present invention, the method based on preserved sub-carrier can not carry out distortion process to signal, thus can not the BER performance of influential system, and the subcarrier only taking 1% just can reach the effect of well reduction PAPR.
Accompanying drawing explanation
Fig. 1 is shown as the principle schematic of falling PAPR method based on preserved sub-carrier position pattern in the present invention.
PAPR performance comparison figure falls in the data symbol under SISO pattern that to fall in PAPR method that Fig. 2 is shown as based on preserved sub-carrier position pattern in the present invention.
PAPR performance comparison figure falls in the data symbol under MIXO pattern that to fall in PAPR method that Fig. 3 is shown as based on preserved sub-carrier position pattern in the present invention.
PAPR performance comparison figure falls in the signaling symbols under SISO pattern that to fall in PAPR method that Fig. 4 is shown as based on preserved sub-carrier position pattern in the present invention.
PAPR performance comparison figure falls in the signaling symbols under MIXO pattern that to fall in PAPR method that Fig. 5 is shown as based on preserved sub-carrier position pattern in the present invention.
Fig. 6 is shown as the schematic flow sheet fallen by peak clipping reduction PAPR in PAPR method based on preserved sub-carrier position pattern in the present invention.
Embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this specification can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this specification also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.
The object of the invention is to the formation method of the preserved sub-carrier position pattern of NGB-W system, for solving the too high problem of existing NGB-W system time-domain signal Peak-Average-Power Ratio, improving the power amplification efficiency of making a start.Below by formation side's ratio juris of elaborating based on the preserved sub-carrier position pattern of NGB-W system of the present invention and execution mode, those skilled in the art are made not need creative work can understand the formation method of the preserved sub-carrier position pattern of a kind of NGB-W system of the present invention.
The invention provides a kind of formation method of preserved sub-carrier position pattern of NGB-W system, be applied in NGB-W system, in NGB-W system, each physical frame comprises signaling symbols, data symbol and postamble symbol, and often kind of symbol has respective different pilot tone; Signaling symbols comprises signaling pilot tone; Data symbol comprises scattered pilot, edge pilot and continuous pilot; Postamble symbol comprises edge pilot and postamble pilot tone; The transmission band of NGB-W system is divided into two subbands in left and right, and all pilot tones distribute identical on the subband of two, left and right, and described method comprises: the position selecting preserved sub-carrier in the non-pilot position of signaling symbols, data symbol and postamble symbol; Wherein, remove scattered pilot in data symbol again, continuous pilot, continuous pilot move to right position that 3 subcarriers obtain, continuous pilot moves to right position that 6 subcarriers obtain, continuous pilot move to right position that 9 subcarriers obtain, the position of edge pilot, position after each 12 sub-carrier positions of NGB-W system two subband left hand edges.Below describe said method of the present invention in detail.
The present invention will be incorporated in NGB-W system based on the PAPR method of falling of preserved sub-carrier (TR), method based on preserved sub-carrier can not carry out distortion process to signal, thus can not the BER performance of influential system, the subcarrier only taking 1% just can reach the effect well reducing PAPR.For NGB-W system, carry out the selection of concrete preserved sub-carrier position, thus reach the object reducing NGB-W system time-domain signal PAPR.
In NGB-W system, each physical frame comprises signaling symbols, data symbol and postamble symbol.Often kind of symbol has respective different pilot tone: signaling symbols comprises signaling pilot tone; Data symbol comprises scattered pilot, continuous pilot and edge pilot; Postamble symbol comprises postamble pilot tone and edge pilot.The position at these different pilot tone places is different.In addition, the scattered pilot of data symbol also has 8 kinds: pattern 1(PP1) to pattern 8(PP8), the sub-carrier positions at different scattered pilot pattern places is also different.Based on the PAPR reduction method of preserved sub-carrier, random information is placed in some position outside these pilot frequency locations, plays the effect reducing OFDM symbol PAPR.
Main technical point of the present invention is to find some preserved sub-carrier positions, to reach the requirement of falling PAPR based on preserved sub-carrier.Finding the criterion of preserved sub-carrier position is: on these preserved sub-carrier positions, carry 1, other subcarriers carry 0, can construct a basic time domain class pulse signal.Utilize such pulse signal to carry out peak clipping process with iteration clipping algorithm to the time-domain signal sent, the object reducing PAPR can be reached.
Below first peak clipping principle is described, then provides in NGB-W system the design of the preserved sub-carrier position met needed for this principle.
Adopt and fall PAPR side's ratio juris based on preserved sub-carrier:
1) in OFDM symbol, preserved sub-carrier carries the preserved sub-carrier Position Design scheme subsequent descriptions of 1(NGB-W system), other subcarriers carrying 0, forms the Kernel function falling PAPR, as shown in Figure 1;
2) find transmission signal Data signal more than the time-domain position I of Vclip;
3) impulse of Kernel function is moved to position I, obtain Shifted Kernel function;
4) rescaling (being multiplied by a certain plural number) is carried out to Shifted Kernel function, be then added on signal Data signal, reach the object reducing PAPR.
Preserved sub-carrier position is for building time domain class pulse signal, and therefore, in NGB-W system, these preserved sub-carrier positions will be not used in the transmission of data and signaling, and namely for the OFDM symbol of NGB-W, the cell value that these preserved sub-carriers are corresponding is initialized as y m, l, k=0+0j, wherein, m is frame index, and j is OFDM symbol index in NGB-W frame, and k is sub-carrier indices.
The OFDM symbol of NGB-W system is divided into signaling symbols, data symbol and postamble symbol.In often kind of symbol, subcarrier carries pilot tone or data.The design of pilot frequency locations is in order to meet the normal work of system, and therefore the position of preserved sub-carrier should be found in non-pilot position.Signaling symbols, data symbol pilot distribution are different; Different FFT counts down, and the pilot distribution of data symbol is not identical; Under MIXO with SISO pattern, pilot tone is different.Therefore the position of preserved sub-carrier needs for different sign patterns and multi-antenna mode, selects some groups.The quantity of group is while meeting and falling PAPR performance, as far as possible few, in order to avoid system too complexity.
From this some consideration, for the signaling symbols of NGB-W system, data symbol and postamble symbol, select the method for preserved sub-carrier as follows:
1, the selection of preserved sub-carrier in NGB-W system signaling symbol
Signaling symbols comprises signaling pilot tone, effective sub-carrier positions after removing signaling pilot frequency locations forms the selection space of preserved sub-carrier, go out the preserved sub-carrier position of effective total number of sub-carriers 1% number at described selection space search, get and can construct the minimum preserved sub-carrier indexed set corresponding to time domain class pulse signal of minor peaks.
That is, signaling symbols comprises signaling pilot tone, and the selection space of preserved sub-carrier is the effective sub-carrier positions after removing signaling pilot frequency locations.This spatially searches out the sub-carrier positions of effective total number of sub-carriers 1% number, gets the sub-carrier indices collection corresponding to time domain class pulse signal that the minor peaks that constructs is minimum.
Such as, in signaling symbols, when employing 4K FFT, 8K FFT or 16K FFT pattern, and when effectively subcarrier k meets following relationship, signaling pilot tone is placed in subcarrier k position.
k mod 3 = 0 0 ≤ k ≤ N a 2 - 1 k mod 3 = N a 2 mod 3 N a 2 ≤ k ≤ N a - 1
Preserved sub-carrier forms an index space at the subcarrier k not meeting above-mentioned relation formula, and this index space is searched for.Such as, under 16K FFT pattern, the effective subcarrier number of NGB-W 12626, selects 1% subcarrier, namely 133.Computer searches out 133 sub-carrier indices in search volume, these 133 subcarriers carry 1, other a 16384-133=16251 position carry 0, and obtain a time-domain function, the secondary peak of this time-domain function is enough little, with close to theoretical impulse function.
2, the selection of preserved sub-carrier in NGB-W system data symbol
Data symbol comprises scattered pilot, edge pilot and continuous pilot, and scattered pilot position is along with the increase circulation change of the index of data symbol, and the edge pilot of all data symbols is identical with continuous pilot position.
Scattered pilot comprises 8 kinds, and scattered pilot PP1 is to scattered pilot PP8.The pilot density of scattered pilot PP1 is maximum, search volume under scattered pilot PP1 pattern is the subset of search volume under other scattered pilot types, so the preserved sub-carrier collection searching for out under scattered pilot PP1 also must belong to the search volume under other scattered pilot types.Therefore, design and carry out based on scattered pilot PP1 type.
Under PP1, the selection mode of preserved sub-carrier is, selects a preserved sub-carrier index set Z tR, D, 0, based on this gathers, carry out subcarrier displacement, move to left 3,6,9 subcarriers respectively, obtains other three sub-carrier indices set Z tR, D, 1, Z tR, D, 2, Z tR, D, 3.These four t easet ofasubcarriers are cyclically used in different data symbols.
Sub-carrier indices set Z tR, D, 0search volume be remove scattered pilot index in NGB-W frame in first data symbol, continuous pilot index, continuous pilot move to right index that 3 subcarriers obtain, continuous pilot moves to right index that 6 subcarriers obtain, continuous pilot move to right index that 9 subcarriers obtain, after the index of edge pilot, each 12 sub-carrier indices of NGB-W system two subband left hand edges, effective sub-carrier indices, forms preserved sub-carrier index space.Form at this sub-carrier positions index preserved sub-carrier index space searching out effective total number of sub-carriers 1% number, getting and construct the minimum preserved sub-carrier position corresponding to time domain class pulse signal of minor peaks as preserved sub-carrier indexed set, is Z tR, D, 0.
Such as, under 16K FFT pattern, the search volume of data symbol is as described below.
Effective sub-carrier indices, from 0 to 12625, totally 12626, is designated as set I all, need excluded index to have following three classes:
(a) scattered pilot index
In data symbol, when effective subcarrier k meets following relationship, scattered pilot is placed in subcarrier k position.
k mod ( D X &CenterDot; D Y ) = D X &CenterDot; [ ( N S _ Sym - l ) mod D Y ] 0 < k < N a 2 - 1 ( k - N a 2 ) mod ( D X &CenterDot; D Y ) = D X &CenterDot; [ ( N S _ Sym - l ) mod D Y ] N a 2 < k < N a - 1
Wherein, l is OFDM symbol index in NGB-W frame; D xfor the frequency domain minimum interval of scattered pilot, D yfor the time domain minimum interval of scattered pilot; N s_Symfor the quantity of signaling symbols in this NGB-W frame; N afor effective number of subcarriers.N under 16K FFT pattern a=12626, N s_Symd under=1, PP1 x=3, D yin=4, NGB-W frame, second OFDM symbol is exactly data symbol, therefore index l=1, can obtain the index of scattered pilot subcarrier from above-mentioned formula, is designated as set I sP.
B the index of () edge pilot is 0,12626/2-1,12626/2,12626-1, be designated as set I eP.
The position of (c) continuous pilot
In data symbol, when effective subcarrier k meets following relationship, then continuous pilot is placed in subcarrier k position.
k mod &Delta; = D X min - 1 D X min - 1 &le; k &le; &Delta; &times; ( N CP 2 - 1 ) + D X min - 1 ( k - N a 2 ) mod &Delta; D X min - 1 N a 2 + D X min - 1 &le; k &le; N a 2 + &Delta; &times; ( N CP 2 - 1 ) + D X min - 1
Wherein, N cPfor the quantity of continuous pilot in data symbol; When adopting 4K FFT or 8K FFT, N cP=50; When adopting 16K FFT, N cP=90; When adopting 32K FFT, N cP=180; wherein for D under various scattered pilot type xminimum value.N under 16K FFT pattern a=12626, N cP=90, the index set I of continuous pilot subcarrier can be obtained from above-mentioned formula cP, 0.The index I of subcarrier cP, 0move right 3,6 and 9 the index set I formed cP, 1, I cP, 2, I cP, 3also get rid of outside search volume.
D () in addition, considers preserved sub-carrier set Z tR, D, 0can move to left 3,6,9 subcarriers form preserved sub-carrier set Z tR, D, 1, Z tR, D, 2, Z tR, D, 3, excess space I after being shifted to prevent subcarrier allscope, two leftmost indexes of subband be 0 ~ 11 and the subcarrier of 12626/2 ~ 126/2+11 also need to get rid of outside search volume, these 24 subcarriers are designated as set I 24.
So just, the search volume obtaining 133 preserved sub-carriers is:
I Search_space＝I All-I SP-I EP-I CP,0-I CP,1-I CP,2-I CP,3-I 24
Computer searches out 133 sub-carrier indices in search volume, these 133 subcarriers carry 1, other a 16384-133=16251 position carry 0, and obtain a time-domain function, the secondary peak of this time-domain function is enough little, with close to theoretical impulse function.These 133 sub-carrier indices set are Z tR, D, 0.
3, the selection of preserved sub-carrier in NGB-W system postamble symbol
Postamble symbol comprises edge pilot and postamble pilot tone, and the preserved sub-carrier search volume of signaling symbols is the subset of postamble symbol preserved sub-carrier search volume, and therefore, the preserved sub-carrier indexed set of postamble symbol adopts the preserved sub-carrier indexed set of signaling symbols.
Based on above-mentioned system of selection, the present invention is directed to NGB-W system, often kind of FFT counts down, has formulated four groups of basic preserved sub-carrier index set, as follows:
For signaling symbols and postamble symbol, with corresponding one group of preserved sub-carrier index set Z under MIXO pattern under SISO pattern tR, SISO, S, concrete index value is in table 1.
Table 1
For data symbol, with corresponding one group of preserved sub-carrier index set Z under MIXO pattern under SISO pattern tR, SISO, D, 0, concrete index value sees attached list 2.
Table 2
In addition, because data symbol increasing progressively along with index, scattered pilot can carry out frequency domain displacement, therefore at Z tR, D, 0(Z tR, SISO, D, 0and Z tR, SISO, D, 0general designation) basis on draw other three groups of preserved sub-carrier Z tR, D, 1z tR, D, 2z tR, D, 3.In data symbol, the index set of preserved sub-carrier recycles, and endless form is as shown in table 3.
Such as, under PP1 pattern, along with data symbol index increases progressively from 0, preserved sub-carrier recycles Z tR, D, 0z tR, D, 1z tR, D, 2z tR, D, 3; Under PP2 pattern, along with data symbol index increases progressively from 0, preserved sub-carrier recycles Z tR, D, 0z tR, D, 2; Under PP4 pattern, along with data symbol index increases progressively from 0, preserved sub-carrier recycles Z tR, D, 0....
The relation of the index set of table 3 preserved sub-carrier and data symbol index
Wherein, Z tR, D, 1z tR, D, 0the set of the sub-carrier indices that 3 subcarriers that move to left are formed; Z tR, D, 2z tR, D, 0the set of the sub-carrier indices that 6 subcarriers that move to left are formed; Z tR, D, 3z tR, D, 0the set of the sub-carrier indices that 9 subcarriers that move to left are formed, can be expressed as:
Z TR,D,1＝Z TR,D,0-3,Z TR,D,2＝Z TR,D,0-6,Z TR,D,3＝Z TR,D,0-9。
With the preserved sub-carrier set Z that the present invention formulates tRbuild time domain class pulse signal, utilize such pulse signal to fall the result of PAPR process to transmission signal.
FFT counts: 2K/4K/8K/16K/32K; Multi-antenna mode: SISO/MIXO pattern; OFDM symbol type: signaling symbols, data symbol.Obtaining design sketch as shown in Fig. 2 ~ Fig. 5, falling the performance of PAPR for ease of determining quantitative analysis, give also the performance that PAPR falls in DVB-T2 system preserved sub-carrier simultaneously.
Fig. 2 ~ Fig. 5 comprises the curve fallen after PAPR under the original peak-to-average force ratio curve that do not do PAPR process and different peak clipping parameter, peak clipping iterations, by contrast, can see: the difference of peak clipping Selecting parameter, fall the effect slightly difference of PAPR; NGB-W system and DVB-T2 system are substantially suitable in the performance of falling PAPR, and different FFT counts and under multi-antenna mode, PAPR all can be made to reduce about 3dB.
Being implemented as follows of PAPR algorithm falls in the preserved sub-carrier formulated based on the present invention.
The number of delivering letters is by the peak clipping of a series of class pulse temporal signal iteration, and these class pulse temporal signals are carried by preserved sub-carrier.Basic class pulse temporal signal definition is as follows:
wherein, N fFTand N tRrepresent that FFT counts and preserved sub-carrier quantity respectively.Vector I tRin have N tRindividual element is 1, and correspondence position is the preserved sub-carrier position that the present invention formulates; There is N fFT-N tRindividual element is 0, and correspondence position is other subcarrier position.
Carry out iteration peak clipping based on preserved sub-carrier of the present invention, reduce the implementation process of PAPR, can describe with flow chart shown in Fig. 6, the flow process based on the PAPR reduction method of preserved sub-carrier algorithm describes as shown in table 4.
Table 4: based on the PAPR reduction method of preserved sub-carrier algorithm
In sum, the formation method of the preserved sub-carrier position pattern of NGB-W system provided by the invention, reaches following beneficial effect:
The present invention is directed to the selection carrying out preserved sub-carrier position of NGB-W system and provide the result of selection, in the present invention, the regioselective result of preserved sub-carrier can construct the time domain class pulse signal close to time domain impulse signal, with this signal, peak clipping process is carried out to transmission signal, thus reach the object reducing OFDM symbol Peak-Average-Power Ratio.Method based on preserved sub-carrier can not carry out distortion process to signal, thus can not the BER performance of influential system, and the subcarrier utilizing the preserved sub-carrier pattern in the present invention only to take 1% just can reach the effect of well reduction PAPR.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.

Claims (6)

1. a formation method for the preserved sub-carrier position pattern of NGB-W system, is applied in NGB-W system, and in NGB-W system, each physical frame comprises signaling symbols, data symbol and postamble symbol, and often kind of symbol has respective different pilot tone; Signaling symbols comprises signaling pilot tone; Data symbol comprises scattered pilot, edge pilot and continuous pilot; Postamble symbol comprises edge pilot and postamble pilot tone; The transmission band of NGB-W system is divided into two subbands in left and right, and all pilot tones distribute identical on the subband of two, left and right, and it is characterized in that, described method comprises:
The position of preserved sub-carrier is selected in the non-pilot position of signaling symbols, data symbol and postamble symbol; Wherein, remove scattered pilot in data symbol again, continuous pilot, continuous pilot move to right position that 3 subcarriers obtain, continuous pilot moves to right position that 6 subcarriers obtain, continuous pilot move to right position that 9 subcarriers obtain, the position of edge pilot, position after each 12 sub-carrier positions of NGB-W system two subband left hand edges.
2. the formation method of the preserved sub-carrier position pattern of NGB-W system according to claim 1, it is characterized in that, in signaling symbols, the mode of the position of preserved sub-carrier is selected to be: the effective sub-carrier positions after removing signaling pilot frequency locations forms the selection space of preserved sub-carrier, go out the preserved sub-carrier position of effective total number of sub-carriers 1% number at described selection space search, get and can construct the minimum preserved sub-carrier indexed set corresponding to time domain class pulse signal of minor peaks.
3. the formation method of the preserved sub-carrier position pattern of NGB-W system according to claim 1, is characterized in that, scattered pilot position is along with the increase circulation change of data symbol index; Edge pilot and continuous pilot position do not change with the increase of data symbol index; Scattered pilot comprises scattered pilot PP1 ~ scattered pilot PP8; The pilot density of scattered pilot PP1 is maximum, and the search volume under scattered pilot PP1 pattern is the subset of search volume under other scattered pilot types, and the preserved sub-carrier collection searching for out under scattered pilot PP1 also belongs to the search volume under other scattered pilot types; Under scattered pilot PP1, select to determine that the mode of the position of preserved sub-carrier is in data symbol:
The scattered pilot of first data symbol in removing NGB-W frame, continuous pilot index, continuous pilot moves to right the index that 3 subcarriers obtain, continuous pilot moves to right the index that 6 subcarriers obtain, continuous pilot moves to right the index that 9 subcarriers obtain, edge pilot index, after each 12 sub-carrier indices of NGB-W system two subband left hand edges, form preserved sub-carrier index space, preserved sub-carrier index space searches out the preserved sub-carrier position of effective preserved sub-carrier sum 1% number, get and can construct the minimum preserved sub-carrier indexed set corresponding to time domain class pulse signal of minor peaks.
4. the formation method of the preserved sub-carrier position pattern of NGB-W system according to claim 2, it is characterized in that, in postamble symbol, the mode of the position of preserved sub-carrier is selected to be: the preserved sub-carrier search volume in signaling symbols is the subset of postamble symbol preserved sub-carrier search volume, and the preserved sub-carrier indexed set of signaling symbols is also as the preserved sub-carrier indexed set of postamble symbol.
5. the formation method of the preserved sub-carrier position pattern of the NGB-W system according to claim 2 or 4, is characterized in that,
For signaling symbols and postamble symbol, under SISO pattern or MIXO pattern, the concrete index value of preserved sub-carrier indexed set is shown in
Table 1:
Table 1
6. the formation method of the preserved sub-carrier position pattern of NGB-W system according to claim 3, is characterized in that, pin
To data symbol, under SISO pattern or MIXO pattern, the concrete index value of preserved sub-carrier indexed set is in table 2:
Table 2
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