CN103647739A - OFDM-PON uplink frame synchronization method - Google Patents
OFDM-PON uplink frame synchronization method Download PDFInfo
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- CN103647739A CN103647739A CN201310513868.7A CN201310513868A CN103647739A CN 103647739 A CN103647739 A CN 103647739A CN 201310513868 A CN201310513868 A CN 201310513868A CN 103647739 A CN103647739 A CN 103647739A
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Abstract
The invention relates to an OFDM-PON uplink frame synchronization method. The method is realized through the following steps: (1) unsynchronized signals are inputted; (2) the unsynchronized signals are cached and long and short training sequences of the unsynchronized signals are selected; (3) coarse synchronization is realized through the short training sequence; (4) signal fine synchronization is realized through the long training sequence and the coarse synchronization; (5) frame synchronization calibration is realized through synchronization calibration control; (6) the synchronization process is performed on the cached unsynchronized signals; (7) and finally, the synchronized signals are outputted. According to the invention, synchronization can be performed on received signals accurately through the frame synchronization system, and frame synchronization marking signals can be outputted. The OFDM-PON uplink frame synchronization method is novel in practical applications, and can be used as a reference of the access network synchronization schemes.
Description
Technical field
The invention provides a kind of OFDM-PON up link frame synchornization method, realized high-speed data-flow in the real-time frame synchronization of OFDM-PON system receiving terminal, is the stationary problem of Next Generation Access technology, proposes a solution.
Background technology
OFDM (OFDM) is a kind of advanced person's multi-carrier modulation technology, has the modulation format of high flexible, the higher availability of frequency spectrum and better anti-multipath interference performance, has been widely used in wireless communication field and radio network.But along with the raising of people's living standard, people constantly increase the demand of communication bandwidth, and existing technology is difficult to solve the developing direction of optical fiber communication two-forty, large capacity and long distance.Thereby, propose OFDM technology to introduce in optical access network, form 0FDM-PON system, but in Access Network, because terminal use disperses, need to solve the synchronous problem of data.Therefore a kind of OFDM-PON up link frame synchornization method is proposed herein.
Summary of the invention
The object of the invention is to solve the synchronous of OFDM-PON uplink signal, propose a kind of OFDM-PON up link frame synchornization method, realize the real-time synchronization of signal in OFDM-PON system.
In order to achieve the above object, the present invention adopts following technical proposals:
An OFDM-PON up link frame synchornization method, performing step is:
(1) not synchronizing signal input;
(2) choose the length training sequence in data;
(3) buffer memory synchronizing signal and choose the length training sequence in synchronizing signal not;
(4) utilize long training sequence and thick synchronous settling signal to realize thin synchronous;
(5) utilize synchronous calibration to control the synchronous calibration of achieve frame;
(6) the not synchronizing signal of buffer memory is synchronously processed;
(7) finally export synchronizing signal.
The not synchronizing signal input of described step (1) in above-mentioned a kind of OFDM-PON up link frame synchornization method, comprising: not synchrodata and frame pulse signal.。
Described step (2) buffer memory in above-mentioned a kind of OFDM-PON up link frame synchornization method is synchronizing signal and choose the length training sequence in synchronizing signal not, comprise: buffer memory is synchrodata and frame pulse signal not, choose the length training sequence in synchrodata not.
It is thick synchronous that described step (3) in above-mentioned a kind of OFDM-PON up link frame synchornization method utilizes short training sequence to realize, and comprises the steps:
(31) first, slightly the intercepting of synchrodata window needs thick synchronous data;
(32) by energy operational data window, separate 10 short training sequences;
(33) through postponing correlation energy, calculate again;
(34) and by threshold values check with effective value and count;
(35) if effective value count value is greater than L, slightly synchronously complete, export thick synchronous calibration coefficient and thick synchronous complement mark, otherwise return to thick synchrodata window, reselect data and process.
It is thin synchronous that described step (4) in above-mentioned a kind of OFDM-PON up link frame synchornization method utilizes long training sequence and thick synchronous settling signal to realize, and comprises the steps:
(41) first, carefully the intercepting of synchrodata window needs thin synchronous data;
(42) then, by correlation energy operational data window, separate 2 long training sequences;
(43) long training sequence of the local long training sequence of process and reception carries out related operation again, and checks by maximum;
(44) if the maximum of the related operation of choosing is greater than K related operation value, carefully synchronously complete, export thin synchronous calibration coefficient and thin synchronous complement mark, otherwise return to thin synchrodata window, reselect data and process.
Described step (5) synchronous calibration in above-mentioned a kind of OFDM-PON up link frame synchornization method is controlled the synchronous calibration of achieve frame, comprising: utilize thick synchronous calibration coefficient and thin synchronous calibration coefficient to control through synchronous calibration, produce frame synchronization calibration factor.
Described step (6) in above-mentioned a kind of OFDM-PON up link frame synchornization method is synchronously processed the not synchronizing signal of buffer memory, comprise: utilize the movement of frame synchronization calibration factor control frame pulse signal, complete the synchronous of data, and produce frame-synchronizing impulse and frame synchronization settling signal.
Described step (7) in above-mentioned a kind of OFDM-PON up link frame synchornization method is finally exported synchronizing signal, comprising: frame-synchronizing impulse, frame synchronization settling signal and synchrodata.
The present invention compared with prior art, has following apparent outstanding substantive distinguishing features and remarkable advantage:
The present invention realizes and will receive signal by frame synchronization system, can carry out to received signal accurately synchronously, and output frame synchronous mark signal.More novel in actual applications, can be used as a kind of reference of Access Network synchronization scenario.
Accompanying drawing explanation
Fig. 1 is a kind of OFDM-PON up link of the present invention frame synchornization method structural representation;
Fig. 2 is the thick synchronous definition schematic diagram of the present invention;
Fig. 3 is the thin synchronous definition schematic diagram of the present invention;
Fig. 4 is the definition schematic diagram of OFDM-PON physical frame in one embodiment of the invention.
embodiment
For making object of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing preferred embodiment that develops simultaneously, describe.
Embodiment mono-:
Referring to Fig. 1, this OFDM-PON up link frame synchornization method is realized the synchronous of OFDM-PON upstream data, and performing step is:
(1) not synchronizing signal input;
(2) choose the length training sequence in data;
(3) buffer memory synchronizing signal and choose the length training sequence in synchronizing signal not;
(4) utilize long training sequence and thick synchronous settling signal to realize thin synchronous;
(5) utilize synchronous calibration to control the synchronous calibration of achieve frame;
(6) the not synchronizing signal of buffer memory is synchronously processed;
(7) finally export synchronizing signal.
Embodiment bis-:
The present embodiment and embodiment mono-are basic identical, and special feature is as follows: referring to Fig. 2 and Fig. 3,
Not synchronizing signal input of described step (1), comprising: not synchrodata and frame pulse signal input.Described step (2) buffer memory is synchronizing signal and choose the length training sequence in synchronizing signal not, comprising: buffer memory is synchrodata and frame pulse signal not, chooses the length training sequence in synchrodata not.It is thick synchronous that described step (3) utilizes short training sequence to realize, and comprises the steps:
(31) first, slightly the intercepting of synchrodata window needs thick synchronous data;
(32) by energy operational data window, separate 10 short training sequences;
(33) through postponing correlation energy, calculate again;
(34) and by threshold values check with effective value and count;
(35) if effectively count value is greater than L, slightly synchronously complete, export thick synchronous calibration coefficient and thick synchronous complement mark, otherwise return to thick synchrodata window, reselect data and process.It is thin synchronous that described step (4) utilizes long training sequence and thick synchronous settling signal to realize, and comprises the steps:
(41) first, carefully the intercepting of synchrodata window needs thin synchronous data;
(42) then, by correlation energy operational data window, separate 2 long training sequences;
(43) long training sequence of the local long training sequence of process and reception carries out related operation again, and checks by maximum;
(44) if the maximum of the related operation of choosing is greater than K related operation value, carefully synchronously complete, export thin synchronous calibration coefficient and thin synchronous complement mark, otherwise return to thin synchrodata window, reselect data and process.Described step (5) is controlled the synchronous calibration of achieve frame by synchronous calibration, comprising: utilize thick synchronous calibration coefficient and thin synchronous calibration coefficient to control through synchronous calibration, produce frame synchronization calibration factor.Described step (6) is synchronously processed the not synchronizing signal of buffer memory, comprising: utilize the movement of frame synchronization calibration factor control frame pulse signal, complete the synchronous of data, and produce frame-synchronizing impulse and frame synchronization settling signal.Described step (7) is finally exported synchronizing signal, comprising: frame-synchronizing impulse, frame synchronization settling signal and synchrodata.
Embodiment tri-:
First, Dui16 road not synchronizing signal is carried out respectively buffer memory and is chosen length training sequence wherein, the short training sequence of 160 data points that select (10 of each data points) is carried out to thick long training sequence synchronous and 160 data points to carry out thin synchronous, when thick synchronous effectively count value is greater than L(L, be 128), slightly synchronously complete, when the maximum of thin sync correlation computing, being greater than K(K is 96) individual related operation value, carefully synchronously complete.Then, by thick synchronous calibration coefficient and thin synchronous calibration coefficient, by synchronous calibration control, produce frame synchronization calibration factor, and then the not synchrodata in data buffer storage is synchronously processed.Finally, the synchronous settling signal of output frame, frame-synchronizing impulse signal and synchrodata.
Fig. 4 is the specific definition figure of OFDM-PON system physical frame structure (8) in one embodiment of the invention.In an embodiment, physical frame comprises frame head and data division, and frame head is training sequence, and data division is forgiven 80 OFDM symbols.Wherein short training sequence (8-1) is mainly used in input, slightly synchronous, and it comprises the symbol (t1 ~ t10) of 10 repetitions, and each symbol is got front 16 sampled points of time domain, is total up to 16*10 sampled point.Long training sequence (8-2), follows at short training sequence (8-1) afterwards, comprises two effective OFDM symbols (T1 and T2) and an elongated Cyclic Prefix (G12), is mainly used in thin synchronous and channel estimating.Data division (8-3) is OFDM symbol, and total number of sub-carriers is 64, and OFDM symbol is exported (Dn) by 64 FFT and added 16 dot cycle prefixes (Gn).
The above is better embodiment of the present invention, not for limiting the scope of the invention, all any modifications of making, is equal to replacement and improvement etc., within being all contained in protection scope of the present invention within the present invention's spirit and principle.Protection scope of the present invention is as the criterion with claim of the present invention.
Claims (8)
1. an OFDM-PON up link frame synchornization method, is characterized in that:
Performing step:
(1) not synchronizing signal input;
(2) buffer memory synchronizing signal and choose the length training sequence in synchronizing signal not;
(3) utilize short training sequence to realize thick synchronous;
(4) utilize long training sequence and thick synchronous settling signal to realize thin synchronous;
(5) utilize synchronous calibration to control the synchronous calibration of achieve frame;
(6) the not synchronizing signal of buffer memory is synchronously processed;
(7) finally export synchronizing signal.
2. a kind of OFDM-PON up link frame synchornization method according to claim 1, is characterized in that: not synchronizing signal input of described step (1), comprising: not synchrodata and frame pulse signal input.
3. a kind of OFDM-PON up link frame synchornization method according to claim 1, it is characterized in that: described step (2) buffer memory is synchronizing signal and choose the length training sequence in synchronizing signal not, comprise: buffer memory is synchrodata and frame pulse signal not, choose the length training sequence in synchrodata not.
4. a kind of OFDM-PON up link frame synchornization method according to claim 1, is characterized in that: it is thick synchronous that described step (3) utilizes short training sequence to realize, and comprises the steps:
(31) first, slightly the intercepting of synchrodata window needs thick synchronous data;
(32) by energy operational data window, separate 10 short training sequences;
(33) through postponing correlation energy, calculate again;
(34) and by threshold values check with effective value and count;
(35) if effectively count value is greater than L, slightly synchronously complete, export thick synchronous calibration coefficient and thick synchronous complement mark, otherwise return to thick synchrodata window, reselect data and process.
5. a kind of OFDM-PON up link frame synchornization method according to claim 1, is characterized in that: it is thin synchronous that described step (4) utilizes long training sequence and thick synchronous settling signal to realize, and comprises the steps:
(41) first, carefully the intercepting of synchrodata window needs thin synchronous data;
(42) then, by correlation energy operational data window, separate 2 long training sequences;
(43) long training sequence of the local long training sequence of process and reception carries out related operation again, and checks by maximum;
(44) if the maximum of the related operation of choosing is greater than K related operation value, carefully synchronously complete, export thin synchronous calibration coefficient and thin synchronous complement mark, otherwise return to thin synchrodata window, reselect data and process.
6. a kind of OFDM-PON up link frame synchornization method according to claim 1, it is characterized in that: described step (5) is controlled the synchronous calibration of achieve frame by synchronous calibration, comprise: utilize thick synchronous calibration coefficient and thin synchronous calibration coefficient to control through synchronous calibration, produce frame synchronization calibration factor.
7. a kind of OFDM-PON up link frame synchornization method according to claim 1, it is characterized in that: described step (6) is synchronously processed the not synchronizing signal of buffer memory, comprise: utilize the movement of frame synchronization calibration factor control frame pulse signal, complete the synchronous of data, and produce frame-synchronizing impulse and frame synchronization settling signal.
8. a kind of OFDM-PON up link frame synchornization method according to claim 1, is characterized in that: described step (7) is finally exported synchronizing signal, comprising: frame-synchronizing impulse, frame synchronization settling signal and synchrodata.
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| CN105227392A (en) * | 2014-07-04 | 2016-01-06 | 电信科学技术研究院 | A kind of method of reception timing detection and device |
| CN105245482A (en) * | 2015-10-03 | 2016-01-13 | 上海大学 | OFDM-PON uplink time synchronization method |
| CN105357600A (en) * | 2015-10-21 | 2016-02-24 | 上海大学 | Transmission energy-saving method for OFDM (Orthogonal Frequency Division Multiplexing)-PON (Passive Optical Network) |
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