CN1514558A - Transmitter and receiver capable of controlling peak power - Google Patents
Transmitter and receiver capable of controlling peak power Download PDFInfo
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Abstract
Signal with different disturbance in frequency domain can be obtained by signal in time domain transformed from inverse Fourier transformation passing through different all-pass filter so as to form filtered results possessing different peak distribution characteristic. A group of filtered results having least peak power is selected to be output. Filtering in time domain avoids complicated calculation of inverse Fourier transformation, and property of all-pass filter does not cause unnecessary attenuation for amplitude of signal in frequency domain. Channel estimation method that is to say pilot frequency symbols are interpolated in frequency domain in transmitter, and receiver interpolates impulse response for the channel of carrier possessing pilot frequency symbols. Thus, influence of all-pass filter is eliminated without need of additional signaling exchange. The invention reduces calculated amount without need of transferring additional information to recover original data.
Description
Technical field:
The invention belongs to orthogonal frequency division multiplexed modulation (OFDM) communication technical field, particularly relate to the transmitter and receiver in the ofdm system.
Background technology:
Orthogonal frequency division multiplexed modulation (OFDM) is a kind of rapidly multi-access mode of development in recent years, and has obtained application in WLAN (wireless local area network), digital audio broadcasting and digital video broadcast system.
The peak power of General Definition signal is peak-average power ratio (PAPR) with the ratio of the average power of signal.
" electronics wall bulletin " (Electronics Letters, vol.32, No.21, pp.1963-1964 Oct.1996) has introduced the method for a kind of control peak-average power ratio (PAPR).This method is preceding signal and one group of multiplication with emission of the inverse Fourier transform (IFFT) at transmitter, and every group of coefficient carries out dissimilar phase shifts to the data on the frequency domain; Each result who organizes phase shift transforms to time domain through IFFT respectively, and extract the peak value minimum then from these different time-domain signals one group as final transmission signal; Simultaneously, the information that produces one group of coefficient of final transmission signal is passed to receiver by signaling channel, receiver learns from signaling channel after one group of coefficient that transmitter uses, and with the signal that receives and the conjugate multiplication of this group coefficient, thereby recovers initial data.
The shortcoming of this method is: because transmitter needs comparison signal and organizes the results of multiplication through the peak value behind the IFFT more, a plurality of IFFT need be and just final result can be obtained later on, this just need be a plurality of additional IFFT, and IFFT itself needs a large amount of calculating, has so just increased the computation complexity of transmitter greatly; In addition, which group coefficient transmitter selects, and need notify receiver by signaling channel, and the transmission of such signaling has both taken channel, was easy to be subjected to the influence of channel disturbance again, thereby caused receiver can't correctly recover initial data.
" international electronics and The Institution of Electrical Engineers's broadcasting journal " (IEEE Trans.Broadcasting, vol.48, No.3, pp.223-229, Sept.2002) introduced in a kind of ofdm system the channel estimating of multipath channel and the method for coherent demodulation, be on frequency domain, to insert frequency pilot sign at certain intervals, at receiving terminal, carry out interpolation by detected channel conditions on these pilot frequency carrier waves, just the fading factor that channel forms can be obtained on each carrier wave, and then multipath channel can be in coherent demodulation, removed sending the influence that signal causes.This method do not see in the past and was used for controlling the transmit control of peak power of ofdm system, and in the present invention, it will be used to the additional influence that brings when control transmits peak power in receiver.
Technology contents:
The invention provides a kind of transmitter and receiver of controlling peak power, can reduce the needed amount of calculation of control peak power, can under the prerequisite that does not need additional information transmission, from received signal, recover initial data fully again.The transmitter of control peak power of the present invention obtains time-domain signal 3 with input data signal 1 through IFFT conversion module 2; In cyclic prefix adding module 12, the one section output signal 13 of being added to the front formation band Cyclic Prefix of time-domain signal 11 by former state in the end of time-domain signal 11; It is characterized in that:
In cyclic prefix adding module 4,, form the signal 5 of band Cyclic Prefix with the front that one section former state in end of signal 3 is added signal 3 to; Signal 5 respectively by each all-pass filter in one group of all-pass filter 6, is obtained domain output signal 7 when a different set of respectively; In Cyclic Prefix was removed module 8, one section that filtering result 7 beginning parts are equated with circulating prefix-length was removed, extracts the one section consequential signal 9 exported as filter that equates with signal 3 number of samples then out; Select sending module 10 to add up the peak power of the consequential signal 9 of each filter output respectively, with a signal of peak power minimum as the consequential signal of selecting 11;
Each all-pass filter is all formed by a series of filter sub-unit 14 cascades; The input signal 15 and feedback signal 16 additions of each filter sub-unit obtain signal 17, and signal 17 obtains time delayed signal 19 through the time delay module 18 of a clock cycle, and time delayed signal 19 multiplies each other with filter sub-unit coefficient 20 and obtains feedback signal 16; On the other hand, signal 17 and filter sub-unit coefficient 21 multiplied result 22 and delay time signal 19 additions draw the output signal 23 of filter sub-unit; Described filter sub-unit coefficient 20 and filter sub-unit coefficient 21 constitute the coefficient of all-pass filter, satisfy the relation of conjugation each other;
To finally the transmit information of the time domain all-pass filter that passed through of transmitter is passed to receiver by signaling 23.
The output signal 13 that the front that time-domain signal 11 is added to by former state in one section at the end of described time-domain signal 11 forms the band Cyclic Prefix is meant: the time domain impulse response intercepting to time domain all-pass filter 6 be similar to real time domain impulse response for one section, selects the length of the length of the Cyclic Prefix of interpolation here greater than time domain all-pass filter 6 impulse responses that intercept out.
Described front of adding one section former state in end of signal 3 to signal 3, the signal 5 that forms the band Cyclic Prefix is meant: get the maximum delay and the length sum that intercept time domain all-pass filter 6 impulse responses that come out of the length of the Cyclic Prefix that adds greater than multidiameter delay here.
Transmitter of the present invention also can evenly insert known frequency pilot sign at certain intervals in input data signal 1, this is meant: the length sum of getting the maximum delay of multidiameter delay and time domain all-pass filter 6 impulse responses that intercepting is come out accounts for the ratio of the length of OFDM symbol, on input data signal 1, evenly insert known frequency pilot sign, make the ratio of carrier number that frequency pilot sign is shared and total carrier number account for the ratio of the length of OFDM symbol greater than aforementioned two length sums.
Transmitter respective receiver with above-mentioned control peak power of the present invention, by FFT module 25 input signal 24 is transformed to frequency-region signal 26, it is characterized in that: recover in the module 27 frequency-region signal 26 to be caused the conjugated signal 28 of phase shift from the all-pass filter that signaling 23 recovers transmitter in the all-pass filter phase shift, in multiplier module 29, frequency-region signal 26 obtains signal 30 with conjugated signal 28 corresponding the multiplying each other of phase shift, carries out subsequent treatment such as demodulation, decoding then.
When in input data signal 1, evenly inserting known frequency pilot sign at certain intervals corresponding to described transmitter employing, then in this receiver, received signal 31 transforms to earlier frequency-region signal 32 in FFT module 25, in module 33, channel impulse response on the frequency pilot sign place carrier wave in the signal 32 is detected, and carries out the conjugated signal 34 that interpolation obtains the channel impulse response on each carrier wave then; In module 35, signal 32 and signal 34 corresponding multiplying each other obtain signal 36, carry out subsequent treatment such as demodulation, decoding then.
Prior art is preceding signal and one group of multiplication with emission of the inverse Fourier transform (IFFT) at transmitter, and every group of coefficient carries out dissimilar phase shifts to the data on the frequency domain.Each result who organizes phase shift transforms to time domain through IFFT respectively, and extract the peak value minimum then from these different time-domain signals one group as final transmission signal.In the present invention, thus be by directly carrying out filtering and come different frequency component to signal to carry out the signal 9 that different phase perturbations obtains having different peak features to send for you to choose to transforming to signal 3 on the time domain.So just do not need to use a plurality of IFFT conversion modules 2.On the other hand, by selection to the zero limit of each filter in the bank of filters 6, make the phase-frequency characteristic of each filter 6 have nothing in common with each other, be pseudorandom permutation, thereby still can reach the purpose that each different frequency component to input signal carries out the out of phase disturbance, obtain one group and have the alternative signal 9 that different peak powers distribute.Thereby the computation complexity that the present invention needs original a plurality of IFFT conversion modules 2 has converted the computation complexity that the filter on the time domain needs to.By the zero pole location of designing filter unit 14, make in each filter sub-unit that the coefficient of multiplication is a shape as 1/2,3/4,5/8 etc., corresponding multiplication can be converted into 1-2 addition and realize.So, under situation reasonable in design, can not need complicated complex multiplier among the present invention, only need complex adder just can realize.In addition, because coefficient 20 and coefficient 21 conjugate number each other, so the computing of multiplying each other with coefficient 20 can be reused in the calculating of multiplying each other with coefficient 21.These factor actings in conjunction make the amount of calculation of wanting required for the present invention be significantly smaller than prior art.
General all-pass filter all has the time domain impulse response of endless, but the present invention has adopted time-limited filter to be similar to, so, finally transmit and 9 can regard 3 results that passed through the filter of a finite impulse response that transmit as.Under the zero limit number of the all-pass filter that adopts is not too many situation, concerning receiver, the filter of this finite impulse response can be regarded a part of multipath channel as, thereby can be with aforementioned channel estimating and the influence of eliminating all-pass filter in the transmitter of the method for coherent demodulation to multipath channel in receiver.Thereby the present invention just can allow receiver correctly recover the correct data of not handling through all-pass filter without any need for additionally sending to receiver information.
The present invention adopts time domain all-pass filter group to come the signal on the different carrier that transforms to the ofdm signal on the time domain is carried out different phase perturbations, obtain one group of time-domain signal that peak value is different, therefrom select one of the peak power minimum to launch, and the characteristic of all-pass filter has kept the signal amplitude on each carrier wave constant, thereby can not cause decay to signal.This method is converted to the complexity of a plurality of IFFT conversion the complexity of the all-pass filter on the time domain, the all-pass filter of time domain can be realized simply with the mode of cascade, when selecting coefficient to be the combination of 2 integral number power, realize especially simple, so the all-pass filter group can realize at an easy rate.Because the impulse response of time domain all-pass filter can be with there being limit for length's response filter to be similar to, so the phase perturbation that the time domain filtering of transmitter causes transmitting can be regarded a part of multipath channel as.Thereby can in the frequency-region signal of transmitter, insert the frequency pilot sign of some, receiver can utilize these frequency pilot signs to estimate channel impulse response on the corresponding carrier wave, carry out interpolation then and recover the channel impulse response of channel on all carrier waves, thereby can eliminate the phase perturbation that transmitter causes transmitting, recover original signal.Like this, the present invention's information of not needing special signaling that transmitter is controlled peak power is issued receiver.
Description of drawings:
Accompanying drawing 1 is controlled the structural principle schematic diagram of the transmitter of peak power for the present invention;
Accompanying drawing 2 is the structural representation of the subelement of a time domain all-pass filter;
The structural principle schematic diagram of the receiver of the control peak power the when information of the time domain all-pass filter that accompanying drawing 3 will be passed through for will finally transmitting corresponding to transmitter is passed to receiver by signaling 23;
Accompanying drawing 4 is the structural principle schematic diagram of the receiver of the control peak power when evenly inserting known frequency pilot sign corresponding to transmitter at certain intervals in input data signal 1;
Accompanying drawing 5 exceeds the probability distribution graph of thresholding for transmit signal power under different thresholdings.
Embodiment:
Below in conjunction with the description of drawings embodiments of the invention.
Embodiment 1:
Suppose that carrier number is a transmitter and receiver of controlling peak power of 256.
The transmitter of the control peak power of the embodiment of the invention obtains time-domain signal 3 with input data signal 1 through IFFT conversion module 2; In cyclic prefix adding module 12, the one section output signal 13 of being added to the front formation band Cyclic Prefix of time-domain signal 11 by former state in the end of time-domain signal 11;
In cyclic prefix adding module 4,, form the signal 5 of band Cyclic Prefix with the front that one section former state in end of signal 3 is added signal 3 to; Signal 5 respectively by each all-pass filter in one group of all-pass filter 6, is obtained domain output signal 7 when a different set of respectively; In Cyclic Prefix was removed module 8, one section that filtering result 7 beginning parts are equated with circulating prefix-length was removed, extracts the one section consequential signal 9 exported as filter that equates with signal 3 number of samples then out; Select sending module 10 to add up the peak power of the consequential signal 9 of each filter output respectively, with a signal of peak power minimum as the consequential signal of selecting 11;
Each all-pass filter is all formed by a series of filter sub-unit 14 cascades; The input signal 15 and feedback signal 16 additions of each filter sub-unit obtain signal 17, and signal 17 obtains time delayed signal 19 through the time delay module 18 of a clock cycle, and time delayed signal 19 multiplies each other with filter sub-unit coefficient 20 and obtains feedback signal 16; On the other hand, signal 17 and filter sub-unit coefficient 21 multiplied result 22 and delay time signal 19 additions draw the output signal 23 of filter sub-unit; Described filter sub-unit coefficient 20 and filter sub-unit coefficient 21 constitute the coefficient of all-pass filter, satisfy the relation of conjugation each other;
To finally the transmit information of the time domain all-pass filter that passed through of transmitter is passed to receiver by signaling 23.
The output signal 13 that the front that time-domain signal 11 is added to by former state in one section at the end of described time-domain signal 11 forms the band Cyclic Prefix is meant: the time domain impulse response intercepting to time domain all-pass filter 6 be similar to real time domain impulse response for one section, selects the length of the length of the Cyclic Prefix of interpolation here greater than time domain all-pass filter 6 impulse responses that intercept out.
Described front of adding one section former state in end of signal 3 to signal 3, the signal 5 that forms the band Cyclic Prefix is meant: get the maximum delay and the length sum that intercept time domain all-pass filter 6 impulse responses that come out of the length of the Cyclic Prefix that adds greater than multidiameter delay here.
Transmitter of the present invention also can take evenly to insert at certain intervals known frequency pilot sign in input data signal 1: the length sum of getting the maximum delay of multidiameter delay and time domain all-pass filter 6 impulse responses that intercepting is come out accounts for the ratio of the length of OFDM symbol, on input data signal 1, evenly insert known frequency pilot sign, make the ratio of carrier number that frequency pilot sign is shared and total carrier number account for the ratio of the length of OFDM symbol greater than aforementioned two length sums.
Present embodiment is corresponding to the receiver of the control peak power of the transmitter of above-mentioned control peak power, by FFT module 25 received signal 31 is transformed to frequency-region signal 32, in module 33, channel impulse response on the frequency pilot sign place carrier wave in the signal 32 is detected, and carries out the conjugated signal 34 that interpolation obtains the channel impulse response on each carrier wave then; In module 35, signal 32 and signal 34 corresponding multiplying each other obtain signal 36, carry out subsequent treatment such as demodulation, decoding then.
In the transmitter of this control peak power, per 4 data have a known frequency pilot sign in 256 the signal 1 on frequency domain, module 2 is 256 IFFT conversion, signal 1 is transformed to 256 time-domain signal 3, in cyclic prefix adding module 4, the front that 32 samplings in the end of signal 3 are added to signal 3 forms 288 long sequences 5 being with Cyclic Prefix.Sequence 5 is admitted in one group of all-pass filter 6, obtains corresponding output sequence 7, removes in the module 8 at Cyclic Prefix, and the 33rd sampling beginning from output sequence 7 taken out 256 continuous samplings as signal 8.Select the peak power of the output signal 8 of module 9 each filter branches of statistics, select the consequential signal 11 of road signal 8 conduct selections then with minimum peak power.In cyclic prefix adding module 12, the OFDM symbol that 64 samplings in front of signal 11 is copied to one 320 of last formation is finally launched.
Each all-pass filter 6 all is that all-pass filter unit 14 cascades by 4 single order simple zero first order poles form.In each all-pass filter unit 14, input signal 15 obtains signal 17 with feedback signal 16 additions, and signal 17 is that the time delay unit 18 of a clock cycle obtains the signal 19 through time-delay through delaying time.The signal 19 of process time-delay multiplies each other with coefficient 20 and obtains feedback signal 16.Simultaneously, signal 17 multiplies each other with coefficient 21 and obtains signal 22, and signal 22 obtains output signal 23 with signal 19 additions of process time-delay.
As the coefficient of single order simple zero first order pole all-pass filter unit 14, coefficient 20 and coefficient 21 be conjugate complex number each other, sets up departments several 20 to be-r
*, coefficient 21 is-r that wherein r is the position of zero point on complex plane of corresponding all-pass filter unit.
Here get four different all-pass filters, their dead-center position is respectively 0,0, and 0,0;
0.875，0.75+0.5j，-0.25+0.875j，-0.75-0.5j ；
-0.375+0.75j，-0.75+0.375j，-0.125-0.875j，0.75-0.375j ；
-0.375-0.75j，0.125-0.875j，0.375+0.75j，-0.625+0.625j。First all-pass filter is promptly exported corresponding to the former state of signal.Select module 9 from the output of four all-pass filters, to select an output of peak power minimum.
Calculating one 256 IFFT long, that precision is 8 bits needs 76*256=19456 complex addition, and on the other hand, the present invention only needs 22.67*256=5804 complex addition, is about 1/3 of IFFT amount of calculation.If service precision is the IFFT of 10 bits, the present invention only needs about 1/4 amount of calculation.
The value of the peak power of continuous wave after more being approached finally to pass through shaping filter during for calculating peak power in selecting module 10, what adopt is the over-sampling rate of twice, just the end of the original input data on frequency domain adds that the null sequence of same length forms input signal 1, sends into IFFT module 2 then and begins to carry out follow-up processing.
Receiver of the present invention at first is transformed to frequency-region signal 32 with 256 received signal 31 in IFFT module 25.In module 33, signal in the signal 32 on the carrier wave of frequency pilot sign place is extracted out with the conjugate multiplication of corresponding frequency pilot sign and obtains the frequency domain impulse response of channel on these carrier waves, then the frequency domain impulse response on these carrier waves is carried out interpolation, obtain frequency domain impulse response corresponding on each carrier wave, these frequency domain impulse responses are got conjugation obtain signal 34, in module 35, signal multiplication in the conjugation of the impulse response on each carrier wave and the signal 32 on the corresponding carrier wave, the signal 36 of the influence of channel and the transmitter time domain all-pass filter group of being eliminated, and carry out follow-up processing.
The performance of present embodiment as shown in Figure 5.Abscissa is different thresholding x among the figure
0 2To average power σ
x 2DB value after the normalization, ordinate for output as a result in the wave sequence power exceed thresholding x
0 2The sampling ratio.Curve A is the performance of not passing through the original series of selecting transmission among the figure, curve B is for selecting the performance of the sequence with minimum peak power of output from the output result of two filters, curve C is corresponding to the performance of selecting the sequence with minimum peak power of output from the output result of four all-pass filters.From the result, can see, when the probability that exceeds thresholding is set at 10
-6The time, if select output, can drop to 10.5dB to the thresholding of correspondence from 11.5dB from two filters, if from four filters, select output, can drop to 9.5dB to thresholding.This shows that the present invention can reduce the probability of the peak power that appearance is bigger in the output sequence significantly.
Claims (5)
1, a kind of transmitter of controlling peak power obtains time-domain signal 3 with input data signal 1 through inverse Fourier transform (IFFT conversion) module 2; In cyclic prefix adding module 12, the one section output signal 13 of being added to the front formation band Cyclic Prefix of time-domain signal 11 by former state in the end of time-domain signal 11; It is characterized in that:
In cyclic prefix adding module 4,, form the signal 5 of band Cyclic Prefix with the front that one section former state in end of signal 3 is added signal 3 to; With signal 5 respectively by each all-pass filter in one group of all-pass filter 6, obtain domain output signal 7 when a different set of respectively, remove in the module 8 at Cyclic Prefix, one section that filtering result 7 beginning part is equated with circulating prefix-length is removed, extracts the one section consequential signal 9 exported as filter that equates with signal 3 number of samples then out; Select sending module 10 to add up the peak power of the consequential signal 9 of each filter output respectively, with a signal of peak power minimum as the consequential signal of selecting 11;
Each all-pass filter is all formed by a series of filter sub-unit 14 cascades; The input signal 15 and feedback signal 16 additions of each filter sub-unit obtain signal 17, and signal 17 obtains time delayed signal 19 through the time delay module 18 of a clock cycle, and time delayed signal 19 multiplies each other with filter sub-unit coefficient 20 and obtains feedback signal 16; On the other hand, signal 17 and filter sub-unit coefficient 21 multiplied result 22 and delay time signal 19 additions draw the output signal 23 of filter sub-unit; Described filter sub-unit coefficient 20 and filter sub-unit coefficient 21 constitute the coefficient of all-pass filter, satisfy the relation of conjugation each other;
To finally the transmit information of the time domain all-pass filter that passed through of transmitter is passed to receiver by signaling 23.
2, control the transmitter of peak power according to claim 1, it is characterized in that described front of adding one section former state in end of signal 3 to signal 3, the signal 5 that forms the band Cyclic Prefix is meant: get the maximum delay and the length sum that intercept time domain all-pass filter 6 impulse responses that come out of the length of the Cyclic Prefix that adds greater than multidiameter delay here.
3, control the transmitter of peak power according to claim 1, it is characterized in that this transmitter also can evenly insert known frequency pilot sign at certain intervals in input data signal 1, this is meant: the length sum of getting the maximum delay of multidiameter delay and time domain all-pass filter 6 impulse responses that intercepting is come out accounts for the ratio of the length of orthogonal frequency division multiplexed modulation (OFDM) symbol, on input data signal 1, evenly insert known frequency pilot sign, make the ratio of carrier number that frequency pilot sign is shared and total carrier number account for the ratio of the length of OFDM symbol greater than aforementioned two length sums.
4, a kind of receiver of controlling peak power, comprise by FFT module 25 input signal 24 is transformed to frequency-region signal 26, it is characterized in that: recover in the module 27 frequency-region signal 26 to be caused the conjugated signal 28 of phase shift from the all-pass filter that signaling 23 recovers transmitter in the all-pass filter phase shift, in multiplier module 29, frequency-region signal 26 obtains signal 30 with conjugated signal 28 corresponding the multiplying each other of phase shift, carries out subsequent treatment such as demodulation, decoding then.
5, as the receiver of control peak power as described in the claim 5, it is characterized in that: when taking in input data signal 1, evenly to insert known frequency pilot sign at certain intervals corresponding to transmitter, then in receiver, received signal 31 transforms to earlier frequency-region signal 32 in FFT module 25, in module 33, channel impulse response on the frequency pilot sign place carrier wave in the signal 32 is detected, and carries out the conjugated signal 34 that interpolation obtains the channel impulse response on each carrier wave then; In module 35, signal 32 and signal 34 corresponding multiplying each other obtain signal 36, carry out subsequent treatment such as demodulation, decoding then.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007036134A1 (en) * | 2005-09-30 | 2007-04-05 | Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences | Transmitting device, receiving device and method based on multiple sub-bands filters set |
| CN100358254C (en) * | 2004-08-13 | 2007-12-26 | 华为技术有限公司 | Optimization method for power protection in wireless communication system |
| CN101366215B (en) * | 2005-11-03 | 2012-06-27 | Lg电子株式会社 | Method and apparatus for producing/recovering ofdm/ofdma signals |
| CN101044734B (en) * | 2004-08-20 | 2014-12-10 | 高通股份有限公司 | Unified pulse shaping for multi-carrier and single-carrier waveforms |
| CN115152187A (en) * | 2020-02-18 | 2022-10-04 | 哲库科技有限公司 | Weighted superposition implementation of streaming symbols |
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| JP2988522B1 (en) * | 1998-09-28 | 1999-12-13 | 日本電気株式会社 | CDMA transmitter |
| US6570929B1 (en) * | 1999-07-08 | 2003-05-27 | Telefonaktiebolaget Lm Ericsson (Publ) | Power control scheme for maximizing carrier signal-to-noise ratio in multicarrier transmitters |
| US6128350A (en) * | 1999-08-24 | 2000-10-03 | Usa Digital Radio, Inc. | Method and apparatus for reducing peak to average power ratio in digital broadcasting systems |
| WO2001026264A1 (en) * | 1999-09-30 | 2001-04-12 | Fujitsu Limited | Transmitter, receiver, and transmitting method in multi-carrier transmission system |
| EP1302045A2 (en) * | 2000-07-21 | 2003-04-16 | PMC-Sierra Ltd. | Reduction of peak to average power ratio |
| DE60108423T2 (en) * | 2000-08-01 | 2005-12-22 | Telefonaktiebolaget Lm Ericsson (Publ) | AMPLITUDE LIMIT |
| CN1152493C (en) * | 2002-06-20 | 2004-06-02 | 上海交通大学 | Method for inhibiting peak-to-average ratio in orthogonal frequency division complex communication system |
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- 2002-12-31 CN CNB021606692A patent/CN100483967C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100358254C (en) * | 2004-08-13 | 2007-12-26 | 华为技术有限公司 | Optimization method for power protection in wireless communication system |
| CN101044734B (en) * | 2004-08-20 | 2014-12-10 | 高通股份有限公司 | Unified pulse shaping for multi-carrier and single-carrier waveforms |
| WO2007036134A1 (en) * | 2005-09-30 | 2007-04-05 | Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences | Transmitting device, receiving device and method based on multiple sub-bands filters set |
| CN100568863C (en) * | 2005-09-30 | 2009-12-09 | 中国科学院上海微系统与信息技术研究所 | Emission, receiving system and method thereof based on many Methods of Subband Filter Banks |
| CN101366215B (en) * | 2005-11-03 | 2012-06-27 | Lg电子株式会社 | Method and apparatus for producing/recovering ofdm/ofdma signals |
| CN115152187A (en) * | 2020-02-18 | 2022-10-04 | 哲库科技有限公司 | Weighted superposition implementation of streaming symbols |
| CN115152187B (en) * | 2020-02-18 | 2023-09-29 | 哲库科技(上海)有限公司 | Weighted superposition implementation of streaming symbols |
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