WO2007048278A1 - Procede de reduction de rapport de puissance crete sur puissance moyenne - Google Patents

Procede de reduction de rapport de puissance crete sur puissance moyenne Download PDF

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Publication number
WO2007048278A1
WO2007048278A1 PCT/CN2005/001791 CN2005001791W WO2007048278A1 WO 2007048278 A1 WO2007048278 A1 WO 2007048278A1 CN 2005001791 W CN2005001791 W CN 2005001791W WO 2007048278 A1 WO2007048278 A1 WO 2007048278A1
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WO
WIPO (PCT)
Prior art keywords
sequence
spectrum
shaping
fourier
radio communication
Prior art date
Application number
PCT/CN2005/001791
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English (en)
Inventor
Oskar Mauritz
Branislav Popovic
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to CN2005800510060A priority Critical patent/CN101218769B/zh
Priority to PCT/CN2005/001791 priority patent/WO2007048278A1/fr
Priority to EP05802190A priority patent/EP1932266A4/fr
Publication of WO2007048278A1 publication Critical patent/WO2007048278A1/fr

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Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70706—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation with means for reducing the peak-to-average power ratio

Definitions

  • the invention relates to a method to reduce the peak-to-average power ratio of a radio communication signal, according to the preamble of claim 1. Further, it concerns a transmitter, a receiver and a communication system according to claims 9, 10, and 11 respectively.
  • a low peak-to-average power ratio (PAPR) of the transmitted signal in uplink of a mobile communications system is important, because lower PAPR implies e.g. longer battery life for the same average transmitted power.
  • SC-FDMA Single-Carrier Frequency Division Multiple Access
  • DFT-spread OFDM Discrete Fourier Transform-spread Orthogonal Frequency Domain Multiplexing
  • Figure 1 shows the transmitter structure for DFT-spread OFDM.
  • Each block of M complex modulated symbols x n , n 0,l,...,M-l, is transformed by a DFT and results in M coefficients X&
  • IDFT Inverse Discrete Fourier Transform
  • a cyclic prefix is inserted.
  • a time window may be applied after the cyclic prefix to reduce out-of-band emissions.
  • the cyclic prefix and the time window do not change the PAPR of the signal.
  • the transmitter in Figure 1 has a very similar effect on the power distribution of the transmitted signal as a time-domain processed single-carrier transmission with a sine pulse-shaping filter.
  • the sine waveform decays very slowly and hence the signal at a certain time in general depends on a large number of modulated symbols, which introduces power variations in the transmitted signal and hence increases PAPR.
  • Root-raised cosine (RRC) filters are widely used for pulse- shaping. These filters have the following properties, which are useful in numerous applications:
  • the filters o can be implemented as FIR filters, and o give rise to Nyquist pulses after a matched filter. However, these properties are not important for DFT-spread OFDM, because o time-domain filtering can be replaced by spectrum-shaping in the frequency domain, and o frequency-domain equalization is performed regardless the impulse response of the channel including spectrum-shaping.
  • the RRC filter gives shorter pulse shapes with increasing roll-off factor.
  • the shorter pulse shape implies that the signal at a certain time instant depends on a small number of symbols, which gives a small variation of the signal amplitude, and hence lower PAPR than for the sine filter.
  • the sine filter is a RRC filter with roll-off factor equal to zero.
  • One way to reduce the PAPR of the signal in DFT-spread OFDM is to apply spectrum shaping by multiplying the output of the DFT component-wise with a spectrum-shaping sequence, see Document 2, as shown in Figure 2. hi case the signal is mapped on a larger set of sub-carriers than the size of the DFT, the input to the spectrum-shaping block is periodically extended before multiplication with the spectrum-shaping sequence.
  • the spectrum shaping is described by the following equation,
  • S k are the components of the spectrum shaping sequence and U is the number of occupied sub-carriers.
  • the output of the IDFT is given by
  • the only spectrum-shaping sequence S that has been proposed in prior art is sampled from the root-raised cosine (RRC) function, i.e. the transfer function of the RRC filter.
  • RRC root-raised cosine
  • a main object is consequently to propose a method that enables a lower PAPR for SC-FDMA, compared to SC-FDMA with RRC shaping.
  • the present invention suggests a solution that under certain circumstances yields a PAPR that analytically can be proven to be minimised.
  • this is accomplished by a method having the characteristics that are defined in claim 1, by a transmitter having the characteristics of claim 9, by a receiver having the characteristics of claim 10 and by a radio communication system having the characteristics of claim 11.
  • a radio communication signal is filtered in the discrete frequency domain with a spectrum-shaping sequence.
  • This sequence is chosen to possess a spectrum that is maximised in a finite interval, i.e. the energy outside the finite interval is minimised.
  • the spectrum shaping sequence of the invention can be designed to have an adjustable parameter to trade off the peak-to-average power ratio to the required average signal-to-noise ratio.
  • This parameter can constitute or correspond to the width of said finite interval.
  • the spectrum shaping sequence of the invention can constitute substantially a discrete prolate spheroidal sequence or a product of a discrete prolate spheroidal sequence and a sampled function.
  • the spectrum shaping sequence of the invention can constitute an approximation of a discrete prolate spheroidal sequence. Such an approximation is a Kaiser window.
  • the spectrum-shaping sequence may also constitute a Kaiser window multiplied with a sampled function.
  • the method of the invention could be implemented in a transmitter for a radio communication system. Preferably, such a transmitter would be communicating with a corresponding receiver for a radio communication system, including means for receiving and processing signals generated by the transmitter. Together they would form part of a radio communication system that would include at least one such transmitter and at least one such receiver.
  • fig. 1 constitutes a block diagram of a method according to prior art
  • fig. 2 constitutes a block diagram of the method of the invention
  • fig. 3 illustrates a radio communication system employing the method of the invention.
  • Fig. 2 constitutes a block diagram of the method of the invention.
  • the invention consists of the selection of the index-limited spectrum-shaping sequence of length U, where U is greater than or equal to M, whose Fourier spectrum is such that the energy in a finite interval is maximised, i.e. the energy outside the finite interval is minimised.
  • the function is not restricted to give a Nyquist pulse in the time domain after matched filtering, and hence it may induce inter-symbol interference. Inter-symbol interference does not increase the complexity of the receiver since it contains an equalizer anyway but it may increase the required average signal-to-noise ratio (SNR) for a given throughput. The required SNR increases with increasing main-lobe width of the Fourier spectrum of the spectrum-shaping function due to inter-symbol interference.
  • SNR signal-to-noise ratio
  • x n are modulated data symbols and s(t) is proportional to the Fourier series expansion (Fourier spectrum) of the spectrum shaping sequence S k , s(t) ⁇ . It is assumed that the amplitude of x n is constant (as for phase shift keying) and equals A. /is the centre frequency of the signal and I 7 is the time duration of the useful signal, i.e. the output signal from the IDFT, divided by L.
  • the peak power is proportional to the energy of s plus cross-terms
  • s(i) is the Fourier spectrum of S k , which means that s(t), ⁇ t ⁇ W , where W is of the order of 1/2M, is the main-lobe of the spectrum, while s(t), ⁇ t ⁇ > W contains the sidelobes of the spectrum.
  • W is of the order of 1/2M
  • s(t), ⁇ t ⁇ > W contains the sidelobes of the spectrum.
  • the spectrum-shaping sequence that fulfils this criterion is the zero* 11 discrete prolate spheroid sequence, also labelled discrete prolate spheroidal window, see D. van de Ville et al., "On the N-Dimensional Extension of the Discrete Prolate Spheroidal Window," IEEE Signal Processing Letters, vol. 9, no. 3, pp 89-91, March 2002 (this paper is called Document 3 below).
  • This index-limited sequence maximises the energy in a finite interval of its Fourier spectrum.
  • the discrete prolate spheroidal sequences S®(U, W) are the normalised eigenvectors that satisfy
  • the discrete prolate spheroidal window is the eigenvector S ⁇ that corresponds to the largest eigenvalue )P .
  • W is an adjustment parameter, which allows adjustment of the main- lobe width in the Fourier spectrum of the spectrum-shaping function. While increasing t/and keeping the product UW constant, the discrete prolate spheroidal sequences approximate the (continuous) prolate spheroidal wave function.
  • the Kaiser window has an adjustment parameter ⁇ , which allows adjustment of the main-lobe width in the Fourier spectrum of the spectrum-shaping function.
  • the width of the main-lobe has opposite impacts on the required
  • the Kaiser window spectrum shaping sequences have been evaluated by link-level simulations and their performance has been compared to RRC functions for QPSK.
  • the Kaiser window spectrum shaping sequence introduces inter-symbol interference in the transmitted signal, which in general increases the required average SNR to achieve a certain throughput (spectral efficiency).
  • the PAPR is reduced compared to a RRC spectrum shaping function.
  • the selected performance measure is the throughput as a function of peak transmit power (99.9 percentile), which is proportional to the average received SNR plus PAPR (99.9 percentile) given that the average channel loss and the noise power is constant. The latter is ensured by keeping both noise bandwidth and noise spectral density constant in all simulations.
  • the throughput is the product of the information bit rate and the ratio of transmitted blocks that are received correctly.
  • the modulation and coding are fixed throughout the simulation, i.e. there is no link adaptation.
  • For each modulation two information bit rates, Ri are simulated.
  • the coded bit rate Rc is selected such that the modulated symbol rate equals the 3 dB bandwidth of the RRC function.
  • the Kaiser window has been evaluated for the same coded bit rates as for the different RRC functions.
  • the total bandwidths of the spectrum-shaping functions are selected to give similar out-of-band leakage for all functions, i.e. to be within the same spectral mask.
  • the frame format is according to Document 1, Table 9.1.1-2. Other simulation parameters are given in Table 1 and spectrum-shaping function-dependent parameters are shown in Table 2.
  • the invention also embraces a radio communication system, which for instance could consist of base station(s) 120 of a cellular system 100 and terminal(s) 130 communicating with said base station(s).
  • the base station(s) and/or terminal(s) would include at least one transmitter with means for executing the method according to the invention.
  • the base station(s) and/or terminal(s) would also include at least one receiver including means for receiving and processing signals generated by the transmitter.
  • the spectrum .shaping of the invention can also be achieved with time-domain processing of a single-carrier signal with a pulse-shaping filter, in which the filter coefficients are given by the inverse Fourier transform of the spectrum-shaping sequence.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Power Engineering (AREA)
  • Transmitters (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

L'invention concerne un procédé permettant de réduire le rapport de puissance crête sur puissance moyenne d'un signal de communication radio. Le procédé se distingue par la multiplication du spectre de Fourier d'un signal de communication d'entrée dans le sens des composantes avec une séquence de mise en forme de spectre, sélectionnée de telle sorte que la séquence de mise en forme de spectre présente un spectre de Fourier dont l'énergie est maximisée dans un intervalle fini. L'invention se rapporte également à un émetteur et à un récepteur d'un système de communication radio, ainsi qu'à un tel système de communication radio.
PCT/CN2005/001791 2005-10-28 2005-10-28 Procede de reduction de rapport de puissance crete sur puissance moyenne WO2007048278A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN2005800510060A CN101218769B (zh) 2005-10-28 2005-10-28 用于减小功率峰均比的方法
PCT/CN2005/001791 WO2007048278A1 (fr) 2005-10-28 2005-10-28 Procede de reduction de rapport de puissance crete sur puissance moyenne
EP05802190A EP1932266A4 (fr) 2005-10-28 2005-10-28 Procede de reduction de rapport de puissance crete sur puissance moyenne

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Application Number Priority Date Filing Date Title
PCT/CN2005/001791 WO2007048278A1 (fr) 2005-10-28 2005-10-28 Procede de reduction de rapport de puissance crete sur puissance moyenne

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8654887B2 (en) 2012-01-31 2014-02-18 Futurewei Technologies, Inc. Methods and systems for peak-to-average power reduction without reducing data rate
US8908796B1 (en) 2013-05-15 2014-12-09 University Of South Florida Orthogonal frequency division multiplexing (OFDM) transmitter and receiver windowing for adjacent channel interference (ACI) suppression and rejection
US9008223B1 (en) 2013-12-24 2015-04-14 Freescale Semiconductor, Inc. Transmitter and method for reducing the peak-to-average power ratio of a digitally modulated communication signal
US9893919B2 (en) 2015-11-05 2018-02-13 Samsung Electronics Co., Ltd. Transmission and reception method and apparatus for reducing peak to average power ratio in orthogonal frequency division multiplexing system
WO2018031246A1 (fr) * 2016-08-12 2018-02-15 Qualcomm Incorporated Dispositif de communication à forme d'onde dft à faible papr de forme spectrale
US10411935B2 (en) 2016-12-13 2019-09-10 Futurewei Technologies, Inc. System and method for DFT-S-OFDM PAPR reduction
WO2021216760A1 (fr) * 2020-04-23 2021-10-28 Spectral DSP Corp Systèmes et procédés de multiplexage par répartition orthogonale de la fréquence à porteuse unique mis en forme avec un rapport puissance de crête/puissance moyenne faible
US11784686B2 (en) 2004-08-02 2023-10-10 Genghiscomm Holdings, LLC Carrier interferometry transmitter
US11894965B2 (en) 2017-05-25 2024-02-06 Tybalt, Llc Efficient synthesis and analysis of OFDM and MIMO-OFDM signals

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CN102160310B (zh) * 2008-09-22 2014-06-18 松下电器产业株式会社 无线通信装置及信号分割方法
CN102056248B (zh) * 2009-10-28 2014-06-11 中国移动通信集团公司 一种降低峰均比的方法和设备
CN105681241B (zh) * 2016-01-06 2019-04-30 北京邮电大学 降低fbmc-oqam信号峰均功率比的方法及装置
CN111526106B (zh) * 2019-02-01 2021-10-15 华为技术有限公司 通信方法及装置
CN115001927B (zh) * 2022-07-12 2023-10-20 深圳智微信通技术有限公司 一种低压电力线载波通信噪声抑制方法

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WO2003041327A2 (fr) * 2001-11-09 2003-05-15 Samsung Electronics Co., Ltd Procede et dispositif permettant de reduire le rapport valeur de crete/valeur moyenne dans un systeme de communication mobile mrof
WO2003063398A1 (fr) * 2002-01-23 2003-07-31 Samsung Electronics Co., Ltd. Procede et appareil permettant d'effectuer des communications numeriques

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11784686B2 (en) 2004-08-02 2023-10-10 Genghiscomm Holdings, LLC Carrier interferometry transmitter
US8654887B2 (en) 2012-01-31 2014-02-18 Futurewei Technologies, Inc. Methods and systems for peak-to-average power reduction without reducing data rate
US8908796B1 (en) 2013-05-15 2014-12-09 University Of South Florida Orthogonal frequency division multiplexing (OFDM) transmitter and receiver windowing for adjacent channel interference (ACI) suppression and rejection
US9363127B1 (en) 2013-05-15 2016-06-07 University Of South Florida Orthogonal frequency division multiplexing (OFDM) transmitter and receiver windowing for adjacent channel interference (ACI) suppression and rejection
US9008223B1 (en) 2013-12-24 2015-04-14 Freescale Semiconductor, Inc. Transmitter and method for reducing the peak-to-average power ratio of a digitally modulated communication signal
US9893919B2 (en) 2015-11-05 2018-02-13 Samsung Electronics Co., Ltd. Transmission and reception method and apparatus for reducing peak to average power ratio in orthogonal frequency division multiplexing system
US10003489B2 (en) 2016-08-12 2018-06-19 Qualcomm Incorporated Communication device using a spectral shaped low peak-to-average power discrete Fourier transform waveform
CN109952749A (zh) * 2016-08-12 2019-06-28 高通股份有限公司 使用频谱整形的低papr dft波形的通信设备
CN109952749B (zh) * 2016-08-12 2021-12-10 高通股份有限公司 使用频谱整形的低papr dft波形的通信方法、设备
WO2018031246A1 (fr) * 2016-08-12 2018-02-15 Qualcomm Incorporated Dispositif de communication à forme d'onde dft à faible papr de forme spectrale
US10411935B2 (en) 2016-12-13 2019-09-10 Futurewei Technologies, Inc. System and method for DFT-S-OFDM PAPR reduction
US11894965B2 (en) 2017-05-25 2024-02-06 Tybalt, Llc Efficient synthesis and analysis of OFDM and MIMO-OFDM signals
WO2021216760A1 (fr) * 2020-04-23 2021-10-28 Spectral DSP Corp Systèmes et procédés de multiplexage par répartition orthogonale de la fréquence à porteuse unique mis en forme avec un rapport puissance de crête/puissance moyenne faible
US11563617B2 (en) 2020-04-23 2023-01-24 Spectral DSP Corp. Systems and methods for shaped single carrier orthogonal frequency division multiplexing with low peak to average power ratio

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Publication number Publication date
EP1932266A4 (fr) 2009-03-04
EP1932266A1 (fr) 2008-06-18
CN101218769B (zh) 2011-07-27
CN101218769A (zh) 2008-07-09

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