CN1213580C - Modulation method for a multi-carrier process with pre-emphasis - Google Patents
Modulation method for a multi-carrier process with pre-emphasis Download PDFInfo
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- CN1213580C CN1213580C CN00819931.0A CN00819931A CN1213580C CN 1213580 C CN1213580 C CN 1213580C CN 00819931 A CN00819931 A CN 00819931A CN 1213580 C CN1213580 C CN 1213580C
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- preemphasis
- subcarrier
- receiver
- transmission
- transport tape
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Abstract
The present invention relates to a technical method for modulating multi-carriers which transmit emission signals through a transmission band which has multiple subcarriers (6). According to the present invention, and depending on the current transmission characteristics, at the current transmission side, the self-adaptive preemphasis (4) of the sending signals (1) is performed on each of the sub-carriers (6), and obtained emission signals are modulated onto the transmission band (8). In a receiver, individualized straightening of the received preemphasis emission signals (11) is performed on each of the subcarriers (6) by a self-adaptive equaliser (16).
Description
The modulator approach that is used for the multicarrier method
The present invention relates to the modulator approach of the multicarrier transmitting method that the transport tape transmission through having a plurality of subcarriers transmits.
When passing through the used physical transmission channel transmission signals in broadband, transmission error can appear because frequency selectivity ground changes amplitude (being called signal attenuation) and changes phase place (being called time delay), because the received signal quality deterioration for example error rate rises, and causes the concern to transmission error.Known: as, in receiver, to adopt the single equalizer that all subcarriers are carried out identical correction in order to alleviate the received signal quality deterioration.Such equalizer can be on certain degree the change of compensation magnitude and phase place.This causes adopting transmitting of preemphasis in transmitter.Because the bandwidth of multicarrier system is very wide, the phase place of each subcarrier and amplitude change and may differ widely.Result's each subcarrier in receiver is distorted with having nothing in common with each other.For this is proofreaied and correct, be known in the receiver each subcarrier has been corrected individually.
The known method cost is very high and can not limit the deterioration of received signal quality satisfactorily.
Therefore task of the present invention is, proposes a kind of modulator approach, is used for the multicarrier method that the transport tape transmission through having a plurality of subcarriers transmits, and the received signal quality deterioration that described method causes is very limited.
Described task is finished by the modulator approach of the multicarrier method that the transport tape transmission that is used for through having a plurality of subcarriers transmits.The method is characterized in that in transmitter-side the adaptivity preemphasis that transmits at each subcarrier of described transport tape according to current transmission characteristic is modulated to transmitting of obtaining on the transport tape; And, use the adaptivity equalizer that adopts at each subcarrier personalization that the preemphasis that is received is transmitted and correct in receiver side.Because to the preemphasis that each subcarrier transmits in emission side, described preemphasis depends on actual transmission characteristic, and combines with the adaptivity equalizer, might realize parameters optimization to each concrete subcarrier in receiver.Transmission characteristic especially comprises: signal attenuation, phase change and with the interference effect of frequency dependence.Needn't carry out any preemphasis completely in transmitter-side, but in receiver, carry out last rectification.Guarantee thus to constitute transmitter expensively.Because can correct each concrete subcarrier personalizedly, thereby and identification signal especially well, so can again improve received signal quality.The equalizer of the preemphasis of transmitter aspect and receiver aspect and actual situation are adapted, can be dynamically at this, just only when described situation changes, proofread and correct, perhaps periodically, just with preset time at interval, proofread and correct.Because proofread and correct in transmitter-side, if being transmitted the distortion of generation, preemphasis offsets just, at the best of times no longer need to correct the preemphasized signal on each subcarrier in the receiver.Can constitute receiver very simply thus, and need not expensive attachment device.In the ideal case, in receiver side even can not want equalizer, equalizer cheaply is set perhaps.Thereby transmitter participates in the work of compensation transmission error as rectifier as preaccentuator and receiver.
Particularly measure personalized adjusted value, make and in receiver, carry out the distortionless reconstruction that transmits of this standard by each subcarrier to transport tape.Particularly, relate to amplitude compensation and/or the phase compensation that frequency is selected here.
By preemphasis compensation of phase and group delay can be favourable, because can avoid the problem of relevant intersymbol interference thus greatly.
Can realize with the software scenario of handling the said method step according to modulator approach of the present invention.In transmitter, carry out the preemphasis of adaptivity, thereby when transmission transmits, compensate the distortion of prediction as well as possiblely with average mode transmitting.The adaptive equalizer that each concrete subcarrier is adopted in this preemphasis and the receiver is combined.In transmission course, transmission error distorts received signal, and at the best of times corresponding to signal waiting for transmission is arranged, described received signal is received by the FDM receiver of standard in this distortion.Represent frequency division multiple access at this FDM.Under the situation that transmission conditions do not have to change in transmission course, the FDM receiver needn't be taked transmitting to correct again, because this is by to combining preemphasis in transmitter and the adaptive equalizer in receiver and reaching.Yet because transmission conditions have stood the distortion of time correlation, to wide transmission band, the distortion of described time correlation can may be corrected each subcarrier in receiver owing to its frequency dependence causes different subcarrier distortion especially.Yet,, only relate to here and need carry out a spot of correction owing in transmitter, carried out main preemphasis.Therefore described method causes the rectification simplified at receiver.
Explain other details of the present invention and advantage by means of accompanying drawing below.In the accompanying drawings:
Fig. 1 be according to the block diagram of transmitter of the present invention and
Fig. 2 is the block diagram according to receiver of the present invention.
In the transmitter shown in Fig. 1, in serial interface 2, the output signal of bit stream 1 form is separated into a plurality of secondary floies (for example 3).Wherein each single secondary flow has certain bit number (indicating with 1 to m respectively) and shines upon in encoder 3 respectively.For example can take the QPSK mapping.Wherein secondary flow is applied to transmit the frequency band subcarrier 6 of this bit stream 1 just mutually.Follow each secondary flow preemphasis in ad hoc for this reason suitable preaccentuator 4.Then the secondary flow of each preemphasis is respectively passed through a pulsed filter 5, for example low pass filter is exported.Then then each secondary flow is distributed to the frequency that is used for transmitting with predetermined frequency band the subcarrier 6 of this bit stream.Constitute a summation signals 7 by each sub signal then.Summation signals 7 is modulated into carrier wave with conventional mode in modulator 8.Certain noise 9 and be subjected to the influence of channel transfer function 10 on when transmission, described signal was by the transmission channel superposition.Thereby draw the signal 11 of actual transmissions.
In the receiver shown in Fig. 2, receive the signal 11 of actual transmissions, and by known demodulator 12 demodulation.Respectively by a filter, for example matched filter 13 for each subcarrier 6 of the frequency band that is used to transmit, output.Each secondary flow respectively connects the sampling apparatus 14 of a symbol sebolic addressing.Each secondary flow is respectively by a determinant/quantizer 15 then.Then carry out the rectification of each secondary flow by adaptive equalizer 16, described adaptive equalizer 16 is corrected according to the distortion of each secondary flow.Each secondary flow goes mapping (Demapping) therein respectively by a decoder 17 then.Then bit stream is remapped into individual bit stream 19 in parallel/serial line interface 18.Under the best circumstances, if preemphasis in transmitter and transmission error are offset by the rectification of the equalizer of receiver just, this bit stream 19 is identical with the bit stream 1 of the output signal of former input.
Reference numeral
1 bit stream
2 serial interfaces
3 encoders
4 preaccentuators
5 pulsed filters
6 subcarriers
7 summation signals
8 modulators
9 noises
10 channel transfer functions
The signal of 11 transmission
12 demodulators
13 matched filters
14 sampling apparatuses
15 determinants/quantizer
16 equalizers
17 decoders
18 parallel/serial line interfaces
19 bit streams
Claims (3)
1. be used for the transmit modulator approach of multicarrier method of (1) of transport tape transmission through having a plurality of subcarriers (6),
It is characterized in that,
In transmitter-side, at the transmit adaptivity preemphasis (4) of (1) of each subcarrier (6) of described transport tape, transmitting of obtaining is modulated on the transport tape (8) according to current transmission characteristic; And in receiver side, use at the personalized adaptivity equalizer (16) that adopts of each subcarrier (6) to the preemphasis that is received transmit (11) correct.
2. modulator approach as claimed in claim 1,
It is characterized in that,
Each subcarrier (6) for transport tape is measured each personalized adjusted value, especially amplitude compensation and/or the phase compensation of selecting at frequency.
3. modulator approach as claimed in claim 1 or 2,
It is characterized in that,
By preemphasis (4) compensation of phase time delay and group delay.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/DE2000/003434 WO2001024343A1 (en) | 1999-09-30 | 2000-09-27 | Method for recognizing an oscillation in an electric supply network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1454423A CN1454423A (en) | 2003-11-05 |
| CN1213580C true CN1213580C (en) | 2005-08-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00819931.0A Expired - Fee Related CN1213580C (en) | 2000-09-27 | 2000-09-29 | Modulation method for a multi-carrier process with pre-emphasis |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1213580C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106357582A (en) * | 2016-10-27 | 2017-01-25 | 长沙理工大学 | In-band and out-band interference suppression signal modulation and demodulation method based on independent filtering of subcarrier cluster |
| CN109783420B (en) * | 2019-01-09 | 2021-03-26 | 芯原微电子(上海)股份有限公司 | High-speed serial transmitter based on FDSOI technology and adopting phase pre-emphasis |
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2000
- 2000-09-29 CN CN00819931.0A patent/CN1213580C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1454423A (en) | 2003-11-05 |
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