15 research outputs found
New scheme for PAPR reduction in FBMC-OQAM systems based on combining TR and deep clipping techniques
Filter bank multi-carrier with offset quadrature amplitude modulation (FBMC-OQAM) system is a very efficient multicarrier modulation technique for 5G, but it suffers as all multicarriers designs from large peak-to-average power ratio (PAPR). Tone reservation (TR) is a method designed to solve this problem by reserving several subcarriers called tones in the frequency domain to generate a cancellation signal in the time domain to eliminate high peaks. In this paper, we suggest a serial combination of tone reservation (TR) method with an enhanced version of clipping called deep clipping (DC) method (TR&DC) to enhance the peaks (PAPR) mitigation in FBMC-OQAM signal model without signiο¬cantly impacting the quality of transmission. Numerical results and analysis show that the new TR&DC approach allows better overall performance and offers remarkable gain in term of PAPR mitigation than the TR method, with similar BER performance to TR over additive white gaussian noise channel and Rapp HPA model
Modified Alternative-signal Technique for Sequential Optimisation for PAPR Reduction in OFDM-OQAM Systems
A modified alternative signal technique for reducing peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing systems employing offset quadrature amplitude modulation (OFDM-OQAM) is proposed. Lower PAPR reduces the complexity of digital to analog converters and results in increasing the efficiency of power amplifiers. The main objective of the algorithm is to decrease PAPR with low complexity. The alternative signal method involves the individual alternative signal (AS-I) and combined alternative signal (AS-C) algorithms. Both the algorithms decrease the peak to average power ratio of OFDM-OQAM signals and AS-C algorithm performs better in decreasing PAPR. However the complexity of AS-C algorithm is very high compared to that of AS-I. To achieve reduction in PAPR with low complexity, modified alternative signal technique with sequential optimisation (MAS-S) is proposed. The quantitative PAPR analysis and complexity analysis of the proposed algorithm are carried out. It is demonstrated that MAS-S algorithm simultaneously achieves PAPR reduction and low complexity
Constrained RS coding for Low Peak to Average Power Ratio in FBMC -- OQAM Systems
Multi-carrier modulation techniques have now become a standard in many
communication protocols. Filter bank based multi-carrier (FBMC) generation
techniques have been discussed in the literature as a means for overcoming the
shortcomings of IFFT/FFT based OFDM system. The Peak to Average Power Ratio
(PAPR) is a problem faced by all multi-carrier techniques. This paper discusses
the methods for reducing PAPR in a FBMC system while maintaining acceptable Bit
Error Rate (BER). A new PAPR minimizing scheme called Constrained Reed Solomon
(CRS) coding is proposed. The hybrid techniques using coding and companding are
tested for different channel models and is found to yield promising results.Comment: 6 pages,6 Figures, Journal of Electrical and Electronics Engineerin
Π£ΠΌΠ΅Π½ΡΡΠ΅Π½ΠΈΠ΅ PAPR Π² ΡΠΈΡΡΠ΅ΠΌΠ°Ρ FBMC-OQAM Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ Π΄ΠΈΡΠΊΡΠ΅ΡΠ½ΠΎΠ³ΠΎ ΠΏΡΠ΅ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΡ ΡΠΊΠΎΠ»ΡΠ·ΡΡΠ΅ΠΉ Π½ΠΎΡΠΌΡ
ΠΠΎΠ»Π½ΡΠΉ ΡΠ΅ΠΊΡΡ Π΄ΠΎΡΡΡΠΏΠ΅Π½ Π½Π° ΡΠ°ΠΉΡΠ΅ ΠΈΠ·Π΄Π°Π½ΠΈΡ ΠΏΠΎ ΠΏΠΎΠ΄ΠΏΠΈΡΠΊΠ΅: http://radio.kpi.ua/article/view/S0021347019020018Π Π°Π±ΠΎΡΠ° ΠΏΠΎΡΠ²ΡΡΠ΅Π½Π° ΠΏΡΠ΅ΠΎΠ΄ΠΎΠ»Π΅Π½ΠΈΡ Π½Π΅Π΄ΠΎΡΡΠ°ΡΠΊΠ°, ΡΠ²ΡΠ·Π°Π½Π½ΠΎΠ³ΠΎ Ρ Π²Π΅Π»ΠΈΡΠΈΠ½ΠΎΠΉ ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΡ ΠΏΠΈΠΊΠΎΠ²ΠΎΠ³ΠΎ ΡΡΠΎΠ²Π½Ρ ΠΌΠΎΡΠ½ΠΎΡΡΠΈ ΡΠΈΠ³Π½Π°Π»Π° ΠΊ ΡΡΠ΅Π΄Π½Π΅ΠΌΡ PAPR (Peak to Average Power Ratio), Π²ΠΎΠ·Π½ΠΈΠΊΠ°ΡΡΠ΅Π³ΠΎ ΠΏΡΠΈ Π½Π΅ΡΠΊΠΎΠ»ΡΠΊΠΈΡ
Π½Π΅ΡΡΡΠΈΡ
Π² Π±Π°Π½ΠΊΠ΅ ΡΠΈΠ»ΡΡΡΠΎΠ² FBMC (Filter-Bank Multi-Carriers) Ρ ΠΊΠ²Π°Π΄ΡΠ°ΡΡΡΠ½ΠΎΠΉ Π°ΠΌΠΏΠ»ΠΈΡΡΠ΄Π½ΠΎΠΉ ΠΌΠΎΠ΄ΡΠ»ΡΡΠΈΠ΅ΠΉ ΡΠΎ ΡΠ΄Π²ΠΈΠ³ΠΎΠΌ OQAM (Offset-QAM) Π² ΡΠΈΡΡΠ΅ΠΌΠ°Ρ
FBMC-OQAM, ΠΊΠΎΡΠΎΡΡΠ΅ ΡΠ²Π»ΡΡΡΡΡ ΠΊΠ°Π½Π΄ΠΈΠ΄Π°ΡΠΎΠΌ ΠΏΡΠΈ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠΈ ΡΠΎΡΠΌΡ ΡΠΈΠ³Π½Π°Π»Π° Π΄Π»Ρ Π±Π΅ΡΠΏΡΠΎΠ²ΠΎΠ΄Π½ΡΡ
ΡΠΈΡΡΠ΅ΠΌ ΡΠ²ΡΠ·ΠΈ ΠΏΡΡΠΎΠ³ΠΎ ΠΏΠΎΠΊΠΎΠ»Π΅Π½ΠΈΡ. ΠΠΈΡΠΊΡΠ΅ΡΠ½ΠΎΠ΅ ΠΏΡΠ΅ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΠ΅ ΡΠΊΠΎΠ»ΡΠ·ΡΡΠ΅ΠΉ Π½ΠΎΡΠΌΡ DSNT (Discrete Sliding Norm Transform) ΠΏΠΎΡΠ»Π΅ ΠΎΠ±ΡΠ°ΡΠ½ΠΎΠ³ΠΎ Π΄ΠΈΡΠΊΡΠ΅ΡΠ½ΠΎΠ³ΠΎ ΠΏΡΠ΅ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΡ Π€ΡΡΡΠ΅ IDFT (Inverse Discrete Fourier Transform) ΠΏΡΠ΅Π΄Π»Π°Π³Π°Π΅ΡΡΡ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ L2-ΠΌΠ΅ΡΡΠΈΠΊΠΈ ΠΈ Π½ΠΎΡΠΌΡ Π΄Π»Ρ ΠΏΡΡΠΈ ΠΎΡΡΡΠ΅ΡΠΎΠ² ΠΏΡΠΈ ΠΊΠ°ΠΆΠ΄ΠΎΠΉ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΈ ΡΠΊΠΎΠ»ΡΠΆΠ΅Π½ΠΈΡ. Π ΠΏΡΠ΅Π΄Π»Π°Π³Π°Π΅ΠΌΠΎΠΌ ΡΠΎΡΡΠ°Π²Π΅ L2-Π½Π°-5 DSNT ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°Π΅ΡΡΡ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΏΠ΅ΡΠ΅ΠΊΡΡΠ²Π°ΡΡΠ΅ΠΉΡΡ ΡΡΡΡΠΊΡΡΡΡ FBMC-OQAM. ΠΡΠΎ ΡΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎ ΡΠΌΠ΅Π½ΡΡΠ°Π΅Ρ Π²Π΅Π»ΠΈΡΠΈΠ½Ρ PAPR Π² ΡΠΈΡΡΠ΅ΠΌΠ°Ρ
FBMC-OQAM, ΡΡΠΎ Π³Π°ΡΠ°Π½ΡΠΈΡΡΠ΅Ρ Π»ΠΈΠ½Π΅ΠΉΠ½ΠΎΡΡΡ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ ΡΡΠΈΠ»ΠΈΡΠ΅Π»Ρ Π±ΠΎΠ»ΡΡΠΎΠΉ ΠΌΠΎΡΠ½ΠΎΡΡΠΈ HPA (High Power Amplifier) ΠΈ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΠ΅Ρ ΠΈΠ·Π±Π΅ΠΆΠ°ΡΡ ΠΈΡΠΊΠ°ΠΆΠ΅Π½ΠΈΡ ΡΠΈΠ³Π½Π°Π»Π°. ΠΡΠ½ΠΎΠ²Π½ΡΠ΅ Π΄ΠΎΡΡΠΎΠΈΠ½ΡΡΠ²Π° ΡΡΠΎΠΉ ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠΈ ΡΠΎΡΡΠΎΡΡ Π² ΡΠΌΠ΅Π½ΡΡΠ΅Π½ΠΈΠΈ Π²ΡΡΠΈΡΠ»ΠΈΡΠ΅Π»ΡΠ½ΠΎΠΉ ΡΠ»ΠΎΠΆΠ½ΠΎΡΡΠΈ ΠΏΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Ρ ΠΈΠ·Π²Π΅ΡΡΠ½ΡΠΌΠΈ ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠ°ΠΌΠΈ ΠΈ ΠΎΡΡΡΡΡΡΠ²ΠΈΠΈ Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΠΈ Π² ΠΊΠ°ΠΊΠΎΠΉ-Π»ΠΈΠ±ΠΎ Π΄ΠΎΠΏΠΎΠ»Π½ΠΈΡΠ΅Π»ΡΠ½ΠΎΠΉ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΈ SI (Side Information) Π½Π° ΡΡΠΎΡΠΎΠ½Π΅ ΠΏΡΠΈΠ΅ΠΌΠ½ΠΈΠΊΠ°. Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΏΠΎΠΊΠ°Π·Π°Π»ΠΈ, ΡΡΠΎ ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠ° L2-Π½Π°-5 DSNT ΠΏΠΎΠ·Π²ΠΎΠ»ΡΠ΅Ρ Π΄ΠΎΡΡΠΈΡΡ 40% ΡΠΌΠ΅Π½ΡΡΠ΅Π½ΠΈΡ Π²Π΅Π»ΠΈΡΠΈΠ½Ρ PAPR ΠΏΡΠΈ CCDF = 10^(β3) ΠΏΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Ρ ΠΈΡΡ
ΠΎΠ΄Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΠΎΠΉ FBMC-OQAM
Enhanced Multicarrier Techniques for Professional Ad-Hoc and Cell-Based Communications (EMPhAtiC) Document Number D3.3 Reduction of PAPR and non linearities effects
Livrable d'un projet EuropΓ©en EMPHATICLike other multicarrier modulation techniques, FBMC suffers from high peak-to-average power ratio (PAPR), impacting its performance in the presence of a nonlinear high power amplifier (HPA) in two ways. The first impact is an in-band distortion affecting the error rate performance of the link. The second impact is an out-of-band effect appearing as power spectral density (PSD) regrowth, making the coexistence between FBMC based broad-band Professional Mobile Radio (PMR) systems with existing narrowband systems difficult to achieve. This report addresses first the theoretical analysis of in-band HPA distortions in terms of Bit Error Rate. Also, the out-of band impact of HPA nonlinearities is studied in terms of PSD regrowth prediction. Furthermore, the problem of PAPR reduction is addressed along with some HPA linearization techniques and nonlinearity compensation approaches
Numerical Simulation and Design of Low PAPR FBMC Communication System for 5G Applications
Unlike SC-FDMA (Single-Carrier Frequency Division Multiple Access), merging only DFT (Discrete Fourier Transform) addition with FBMC-OQAM (filter group multi-carrier with offset quadrature amplitude modulation) only cuts the marginal PAPR. (Peak-to-average power ratio). To take advantage of the single carrier effect of DFT extension, special conditions for the coefficients of the IQ (in-phase and quadrature phase) channels of every single subcarrier ought to be met. As a beginning point, we first originate this form, which we call the ITSM (Identical Time-Shifted Multi-Carrier) condition. Then, depending on this condition, we put forward a new FBMC for low PAPR. The foremost features of the offered way out are summarized as: First, to additionally raise the PAPR reduction, we created four candidate versions of the FBMC waveform for DFT spreading out and ITSM conditions and carefully chosen one with the least peak power. Even with various candidate generations, unlike the traditional SI (Side information) based PAPR reduction scheme, the focal computational fragments (such as DFT and IDFT) are shared and need only be executed one time. Therefore, matched to the prior DFT-expanded FBMC, the overhead in complexity is small, and the recommended pattern can realize a PAPR reduction comparable to SC-FDMA. Second, in the projected pattern each one pass on only two bits of SI from a block of FBMC-OQAM symbols. And so, the SI overhead is meaningfully lesser than a conventional SI-based scheme such as SLM (Selective Mapping) or PTS (Partial Transmission Sequence).The whole work is executed using MATLAB software. The PAPR of FBMC system has been significantly reduced after the application of proposed algorithm. PAPR was reduced by 25 % after the use of DFT spreading and ITSM conditioning
OFDM PAPR reduction for image transmission using improved tone reservation
High peak to average power ration (PAPR) in orthogonal frequency division multiplexing (OFDM) is an important problem, which increase the cost and complexity of high power amplifiers. One of the techniques used to reduce the PAPR in OFDM system is the tone reservation method (TR). In our work we propose a modified tone reservation method to decrease the PAPR with low complexity compared with the conventional TR method by process the high and low amplitudes at the same time. An image of size 128Γ128 is used as a source of data that transmitted using OFDM system. The proposed method decrease the PAPR by 2dB compared with conventional method with keeping the performance unchanged. The performance of the proposed method is tested with several numbers of subcarriers; we found that the PAPR is reduced as the number of subcarriers decreased
PAPR reduction in FBMC using an ACE-based linear programming optimization
This paper presents four novel techniques for peak-to-average power ratio (PAPR) reduction in filter bank multicarrier
(FBMC) modulation systems. The approach extends on current PAPR reduction active constellation extension (ACE)
methods, as used in orthogonal frequency division multiplexing (OFDM), to an FBMC implementation as the main
contribution.
The four techniques introduced can be split up into two: linear programming optimization ACE-based techniques
and smart gradient-project (SGP) ACE techniques. The linear programming (LP)-based techniques compensate for
the symbol overlaps by utilizing a frame-based approach and provide a theoretical upper bound on achievable
performance for the overlapping ACE techniques. The overlapping ACE techniques on the other hand can handle
symbol by symbol processing. Furthermore, as a result of FBMC properties, the proposed techniques do not require
side information transmission. The PAPR performance of the techniques is shown to match, or in some cases improve,
on current PAPR techniques for FBMC. Initial analysis of the computational complexity of the SGP techniques indicates
that the complexity issues with PAPR reduction in FBMC implementations can be addressed.
The out-of-band interference introduced by the techniques is investigated. As a result, it is shown that the
interference can be compensated for, whilst still maintaining decent PAPR performance. Additional results are also
provided by means of a study of the PAPR reduction of the proposed techniques at a fixed clipping probability. The bit
error rate (BER) degradation is investigated to ensure that the trade-off in terms of BER degradation is not too severe.
As illustrated by exhaustive simulations, the SGP ACE-based technique proposed are ideal candidates for practical
implementation in systems employing the low-complexity polyphase implementation of FBMC modulators. The
methods are shown to offer significant PAPR reduction and increase the feasibility of FBMC as a replacement
modulation system for OFDM.http://asp.eurasipjournals.com/hb201
An efficient technique for out-of-band power reduction for the eliminated CP-STC-shaped system for 5G requirements
The most dominant needs for the recent wireless mobile applications are higher bandwidth (BW) efficiency, higher energy efficiency higher quality of services (QOS). The main technique in 4G systems is OFDM but it suffers from some limitations such as large peak to average power ratio (PAPR), higher Out-of-Band (OOB) power radiation, and wasting bandwidth efficiency due to cyclic prefix (CP) extension. In his paper, these OFDM limitations will be reduced with low computational complexity compared to filter bank multicarriers (FBMC). The proposed scheme is based on symbol time compression (STC) for OFDM system. The proposed STC-Shaped system is achieved via interleaver-spreader and symbol shaper in the transmitter side in addition to equalization and combining processes in the receiver side. Comparative study between the proposed system and the conventional OFDM in case of additive white Gaussian noise (AWGN) and COST 207 typical multipath fading channel will be presented. The numerical results show that the proposed STC-Shaped scheme reduces OOB significantly. The proposed scheme improves BER in multipath Rayleigh fading although it is without CP. Thus, the proposed system is more robust against inter symbol interference (ISI) compared to conventional OFDM system. Also, the numerical results show that the PAPR of the proposed system is decreased significantly and also, it is derived theoretically. Also, the proposed scheme overcomes CP extension, and hence increases the bandwidth (BW) efficiency. Finally, the computational complexity for the proposed scheme is derived and it has very low complexity compared to FBMC. The system performance measurments has been fulfilled using cumulative distribution function (CDF), power spectral density (PSD) and bit error rate (BER)
Enabling Technology in Optical Fiber Communications: From Device, System to Networking
This book explores the enabling technology in optical fiber communications. It focuses on the state-of-the-art advances from fundamental theories, devices, and subsystems to networking applications as well as future perspectives of optical fiber communications. The topics cover include integrated photonics, fiber optics, fiber and free-space optical communications, and optical networking