Constellation shaping for bitinterleaved coded apsk. Here we have selected the method introduced in liolis et al. Fpgabased ldpccoded apsk for optical communication. Because the vector in the qam constellation is larger than that in the apsk constellation, the apsk signal can obtain a lower maximum amplitude level than the qam signal. Ustld mapper design for apsk constellations over satellite links. Constellation shaping for bitinterleaved ldpc coded apsk matthew c. Modulation systems used in satellite communications ii. The 16 apsk and 32 apsk have been proposed in the framework of the dvbs2 standard 6 and their performance has been widely investigated over the awgn channel, by.
Modulation systems used in satellite communications ii computer science essay. Carrier phase estimation assisted by pilot symbol for power. If ebno is a vector, the output ber is a vector of the same size, whose elements correspond to the different e b n 0 levels. On the genetic optimization of apsk constellations for satellite broadcasting. Communication systems facts products applications high technology for the global satellite market over the course of five decades, tesatspacecom has developed indepth expertise in manufacturing of payload equipment for communication satellites and has. Alagha, on 64apsk constellation design optimization. Oct 19, 2012 we evaluate the performance of apsk modulation for wireless systems and compare it with the performance of more conventional qam systems. The true pdf left, bivariate gaussian fit middle, and circularly symmetric gaussian fit right. Firstly, we design graymapping apsk constellations with the aid of gmi analysis and provide an indepth. Electrical and electronic engineering university of cagliari, piazza darmi, 09123, cagliari, italy. Pdf on 64apsk constellation design optimization researchgate. Scatter diagram of the received symbols iq components illustrating a nonlinear effects from imprecise amplifier compensation for 64apsk modulation and b phase noise from receiver oscillator instabilities for 64qam constellation.
Optimization is performed according to the sensitivity of the data to the channel errors, by means of genetic algorithms, a wellknown technique currently used in a variety of application domains. The nonuniform shaping and ldpc code rate are jointly considered in the design, which results in a better performance scheme for the same snr values. In the case of the optimum mapsk, its parameters n l, r l and e 1 are designed using a suitable optimization criterion. Amplitude phase shift keying constellation design and its. We optimize our system for the awgn channel over a discrete set of possible signal constellation designs and shaping codes. Improved demapping for channels with datadependent noise. Yan department of electronic engineering, beijing institute of technology, no. It is characterized by four constellation rings having 4, 12, 20 and 28 uniformlyspaced psk points with radius r 1, r 2, r 3 and r 4 respectively.
Approaching the gaussian channel capacity with apsk. To provide the optimum quality of services qos different types of design techniques needs to be consider for different purposes like distinct types of modulation and coding channel and source techniques are used. The optimization is carried out using the conventional criterion of maximum minimum euclidean distance between constellation points. Nov 03, 2015 test results show that through nonuniform constellation and asymmetric symbol mapping, it is possible to significantly reduce the distortion while preserving bandwidth efficiency. S2 modem algorithms design and performance over typical. In this paper, with the aid of mutual information and generalized mutual information gmi capacity analyses, it is shown that the geometrically shaped apsk that mimics an optimal gaussian distribution with equiprobable signaling together with the corresponding graymapping rules can approach the shannon limit closer than conventional quadrature amplitude modulation qam at certain range of. Fpgabased ldpccoded apsk for optical communication systems. In proceedings of the 2014 ieee international symposium on broadband multimedia systems and broadcasting, beijing, china, 2527 june 2014. Published in iet communications received on 18th march 2010 revised on 28th june 2010 doi. The contribution of this paper can be summarized as follows. The berawgn function returns the ber of various modulation schemes over an additive white gaussian noise awgn channel. However, the 64apsk 2 constellation scheme shows the best ber performance in presence of isddinduced phase noise in fig.
Optimization phase noise optimization best closein noise, bestwide offset phase noise, fast tuning, gain imbalancequad skew, coupling on off, clock adjust, iq normalize on off, low snr enhancement on off, multicarrier filter on off, evm normalization reference as constellation rms or max, iq offset compensation on off, iq rotation. Amplitude phase shift keying constellation design and. The exploitation of capacity boosting techniques, such as adaptive coding and. On 64apsk constellation design optimization ieee xplore. Performance of variable coded modulations over a nonlinear. A comparison between apsk and qam in wireless tactical. Because the optimization was performed over a set of 11 constellations six 16apsk constellations and. This paper investigates the design of power and spectrally efficient coded modulations based on amplitude phase shift keying apsk with application. After exchanging it, the constellation diagram showed perfectly concentrated clouds. The primary contribution of this study is summarised as the following aspects.
Instead of traditional power of two signal constellation sizes, we design 5qam, 7qam and 9qam constellations, which can be used in adaptive optical networks. Firstly, 16 to 64 apsk constellations with size and labelling optimisation method are proposed for hm, which can be adapted to transmitting multiple hierarchies with different qos streams and to the nonlinear satellite channels due to a lower peaktoaverage power ratio compared to traditional hierarchical qam modulation. The first input argument, ebno, is the ratio of bit energy to noise power spectral density, in db. The constellation diagram shows a less defined and concentrated cloud a clear indication that the signal modulation was not ok. In particular, in case of good channel we considered the state with the rician probability density function pdf that represents unshadowed areas with relatively high received signal power. Among these three constellation schemes, 64apsk 2 is the optimal constellation scheme to combat isddinduced phase noise. This channel model provides useful insights when apsk is used in satellite systems, while it is important to consider more complex channel models for its use in. The design optimization analysis and results obtained for 16, 32 and 64 apsk modulation schemes based on the mutual information maximization criterion are presented in detail in this. S on 64apsk constellation design optimization, in signal processing for space communications 10th.
Influence of bch and ldpc code parameters on the ber. This paper investigates the design of power and spectrally efficient coded modulations based on amplitude phase shift keying apsk with application to broadband satellite communications. We evaluate the performance of apsk modulation for wireless systems and compare it with the performance of more conventional qam systems. If each of these two signals a 1 t and a 2 t is allowed to take on more than two values, higherorder qask signal sets are obtained. Proceedings of the 6th international conference on. In previous literature, the analysis of apsk has been mainly focused on the awgn channel. There have been numerous geometric and probabilistic proposals for the constellation optimization in the literature. On 64apsk constellation design optimization abstract.
For wideband satellite communication systems, modified signal constellation qam is used. Standard dtmba and the unfold of the tdt in cuba autor. Alagha, on 64apsk constellation design optimization, in proc. On 64apsk constellation design optimization konstantinos p. Liolis kp, alagha ns 2008 on 64apsk constellation design optimization. Design of apsk constellations for coherent optical. Viceversa, we will describe here a heuristicbased approach suited to extension to. The 64 apsk nomenclature used in this paper is as defined in 5. This cited by count includes citations to the following articles in scholar.
Design and optimization of a disaggregated constellation. Constellation design for transmission over nonlinear satellite channels. Abstractan energyefficient approach is presented for shaping a bitinterleaved lowdensity paritycheck ldpc coded amplitude phaseshift keying apsk system. A constellation point from the third ring bottom and fourth ring top of a 64apsk constellation under nonlinear amplification with an input power of 3 db relative to amplifier saturation. Bit error rate ber for uncoded awgn channels matlab berawgn. The design optimization analysis and results obtained for 16, 32 and 64apsk modulation schemes based on the mutual information maximization criterion are presented in detail in this. Pdf on 64apsk constellation design optimization konstantinos. The method includes providing a plurality of information bit streams intended for a plurality of downlinks.
The 64apsk nomenclature used in this paper is as defined in 5. Design and performance analysis of nda carrier phase. Firstly, 16 to 64apsk constellations with size and labelling optimisation method are proposed for hm, which can be adapted to. Viceversa, we will describe here a heuristicbased approach suited to extension to higher level modulation, such as 64 apsk. The ones marked may be different from the article in the profile. Pdf this paper investigates the design of power and spectrally efficient coded modulations based on amplitude phase shift keying apsk with. A method for providing high throughput communications via a radio frequency rf satellite, the method comprising. Finally, we discuss the problem of selecting a good binary labeling for the found constellations. The design optimization analysis and results obtained for 16, 32 and 64 apsk modulation schemes are presented in 35.
Dec 14, 2010 the highest link availability and service area supported by the system depends on the lowest modulation and coding scheme supported by the system. In this study, a new scheme called adaptive hierarchical coding and modulation has been proposed, based on adaptive coding and modulation acm and hierarchical modulation hm. Optimization phase noise optimization best closein noise, bestwide offset phase noise, fast tuning, gain imbalancequad skew, coupling onoff, clock adjust, iq normalize onoff, low snr enhancement onoff, multicarrier filter on off, evm normalization reference as constellation rms or max, iq offset compensation onoff, iq rotation. Merged citations this cited by count includes citations to the following articles in scholar.
Valenti, senior member, ieee, and xingyu xiang, student member, ieee. The estimated covariance for each constellation point is depicted in c and d as ellipsoids at the 99%. To obtain higher spectral efficiency, that is, to transmit more bits per second without requiring more rf bandwidth, admod employs higherorder psk schemes such as qpsk, 8psk, 16 and 64 apsk or qam, etc. Amplitude phase shift keying constellation design and its applications to satellite digital video broadcasting konstantinos p. Electronics free fulltext design of nonequiprobable. Constellation and mapping optimization of apsk modulations used. Tests performed on real signals based on perceptual quality measurements allow validating the proposed scheme against conventional 64 apsk constellations and ccsds.
The most critical aspect of developing a ustld system is the design of the. Chapter number amplitude phase shift keying constellation. Adaptive nonlinear compensation of satellite transponder. Holzinger georgia institute of technology, atlanta, ga 303320150, usa abstract. Thus, design optimization for 64apsk modulation has been addressed in. On 64apsk constellation design optimization this paper investigates the design of power and spectrally efficient coded modulations based on amplitude phase shift keying apsk with application to broadband satellite communications. Simplified evaluation of apsk error performance core. To solve this optimisation problem, samra et al23 applied a search. Optimization of a codedmodulation system with shaped constellation. The apsk modulation has merits for digital transmission over. Electronics free fulltext design of nonequiprobable high. Constellation design is an important approach to overcome the impact of nonlinear distortion in satellite communications 9,10,11. Carrier phase estimation assisted by pilot symbol for. The highest link availability and service area supported by the system depends on the lowest modulation and coding scheme supported by the system.
1068 566 849 400 1650 70 671 1672 433 239 1028 1270 1213 960 547 1250 694 1041 201 948 687 7 1162 1252 179 1425 709 1350 1412 868 1219 4