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Journal articles on the topic "Decision directed equalizers":
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Leng, Ke Cheng, Cheng Bie, Xi Gong, Ran Xu, and Ye Cai Guo. "An Optimized Combination of Frequency Domain Adaptive Equalizers." Applied Mechanics and Materials 548-549 (April 2014): 766–70. http://dx.doi.org/10.4028/www.scientific.net/amm.548-549.766.
In order to overcome the defects of the high computational loads and selecting the threshold of mean square error (MSE) for time domain decision-directed constant modulus blind equalization algorithm (DD+CMA), a frequency domain parallel decision multi-modulus blind equalization algorithm based on frequency domain MMA(FMMA) and frequency domain LMS (FLMS) algorithm is proposed. The proposed algorithm is composed of the FMMA and FLMS, and the FMMA and FLMS run automatically in soft switching parallel manner. In running process, it is not necessary to selecting the threshold of the MSE. Moreover, the computational loads can be reduced by circular convolution in the frequency domain signals instead of linear one of the time domain signals. Simulation results show that performance of the proposed algorithm outperforms the FLMS and the FMMA algorithm.
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Kennedy, R. A., G. Pulford, B. D. O. Anderson, and R. R. Bitmead. "When has a decision-directed equalizer converged?" IEEE Transactions on Communications 37, no. 8 (1989): 879–84. http://dx.doi.org/10.1109/26.31188.
Chan, Kit Yan, Siow Yong Low, Sven Nordholm, and Ka Fai Cedric Yiu. "A Decision-Directed Adaptive Gain Equalizer for Assistive Hearing Instruments." IEEE Transactions on Instrumentation and Measurement 63, no. 8 (August 2014): 1886–95. http://dx.doi.org/10.1109/tim.2014.2302242.
Siller, C. A., and W. Debus. "Decision-directed fractionally spaced equalizer control using time-domain interpolation." IEEE Transactions on Communications 39, no. 2 (1991): 182–86. http://dx.doi.org/10.1109/26.76450.
This paper proposes a simple and robust variable modulation-decision-directed least mean square (VM-DDLMS) algorithm for reducing the complexity of conventional equalization algorithms and improving the stability of variable modulation (VM) systems. Compared to conventional adaptive equalization algorithms, known information was used as training sequences to reduce the bandwidth consumption caused by inserting training sequences; compared with conventional blind equalization algorithms, the parameters and decisions of the equalizer were determinate, which was conducive to a stable equalization performance. The simulation and implementation results show that the proposed algorithm has a better bit error rate (BER) performance than that of the constant modulus algorithm (CMA) and modified constant modulus algorithm (MCMA) while maintaining the same level of consumption of hardware resources. Compared to the conventional decision-directed least mean square (DDLMS) algorithm, the proposed algorithm only needs to make quadrature phase shift keying (QPSK) symbol decisions, which reduces the computational complexity. In parallel 11th-order equalization algorithms, the operating frequency of VM-DDLMS can reach up to 333.33 MHz.
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Suyama, Satoshi, Junichi Onodera, Hiroshi Suzuki, and Kazuhiko Fukawa. "Decision-directed phase noise compensation for millimeter-wave single carrier systems with iterative frequency-domain equalization." International Journal of Microwave and Wireless Technologies 2, no. 3-4 (July 8, 2010): 399–408. http://dx.doi.org/10.1017/s1759078710000516.
This paper proposes a receiver that repeats iterative frequency-domain equalization (FDE) and decision-directed phase noise compensation (DD-PNC) to alleviate degradation due to the phase noise for millimeter-wave single carrier (SC) systems. High bit-rate SC-FDE transceivers based on the single-chip Si RF-CMOS IC technology in the 60-GHz millimeter-wave band have been extensively studied for wireless personal area network (WPAN) systems, and the relatively large phase noise in a phase-locked loop (PLL) synthesizer severely degrades transmission performance. In an initial processing of the proposed receiver, a cyclic prefix (CP)-based phase noise compensator (CP-PNC) removes the phase noise from a time-domain received signal by using CP, which is known to the receiver, and the channel is equalized by the iterative FDE using the conventional minimum mean-square-error (MMSE) weight. In an iterative processing, DD-PNC estimates the phase noise each symbol by exploiting an output of a channel decoder, and then compensates the time-domain received signal for the phase noise by using the estimate. In order to equalize the compensated received signal, the iterative FDE performs both the MMSE filtering and residual inter-symbol interference cancelation using the decoder output. Computer simulations following the 60-GHz WPAN standard demonstrate that in the 64QAM with the coding rate of 3/4, the proposed receiver with three iterations can drastically remove the phase noise of −85 dBc/Hz at 1 MHz offset, and that it can achieve excellent transmission performance.
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Kim, Seunghwan, Hyung-In Ra, Hyun-Woo Jeong, Chang-Hyun Youn, Kyeong pil Yang, In-Soo Kim, and Seokjun Ko. "Joint equalizer and phase-locked loop for time variability in underwater acoustic communications." Journal of the Acoustical Society of America 151, no. 4 (April 2022): A281. http://dx.doi.org/10.1121/10.0011346.
In this paper, we verify the performance of the equalizer and phase-locked loop (PLL) operating jointly for channel time variability in underwater acoustic communications. We apply the decision feedback equalizer in order to eliminate channel multipath and PLL to phase rotation due to Doppler effects. In the PLL, a decision-directed tan−1 type phase detector is adopted. As shown in previous papers, it is difficult to make PLL to be steady state because of time-varying ISI occurred by multipath. Also, the phase rotation incurs the equalizer tap rotation. Therefore, we can see that the two subsystems of equalizer and PLL complement each other perfectly. Another issue is the convergence speed; how quickly we can make the joint equalizer and PLL to be stable state within the preamble period (known data). In order to verify the performance, the sea experiments were conducted in the condition of moving transmitter. The transmitted signal is modulated by using PSK and consists of five burst frames that are composed of preamble of PN code and random data. As a result, if we use the initial multipath value and Doppler frequency offset, we can make the joint equalizer and PLL to be the steady state more quickly.
Hadj Kacem, Imed, Noura Sellami, Inbar Fijalkow, and Aline Roumy. "Training Sequence Length Optimization for a Turbo-Detector Using Decision-Directed Channel Estimation." Research Letters in Communications 2008 (2008): 1–5. http://dx.doi.org/10.1155/2008/860368.
We consider the problem of optimization of the training sequence length when a turbo-detector composed of a maximuma posteriori(MAP) equalizer and a MAP decoder is used. At each iteration of the receiver, the channel is estimated using the hard decisions on the transmitted symbols at the output of the decoder. The optimal length of the training sequence is found by maximizing an effective signal-to-noise ratio (SNR) taking into account the data throughput loss due to the use of pilot symbols.
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Mousa-Pasandi, Mohammad E., and David V. Plant. "Zero-overhead phase noise compensation via decision-directed phase equalizer for coherent optical OFDM." Optics Express 18, no. 20 (September 14, 2010): 20651. http://dx.doi.org/10.1364/oe.18.020651.
Optimal decision directed equalization techniques for time dispersive communication channels are often too complex to implement. This thesis considers reduced complexity decision directed equalization that lowers complexity demands yet retains close to optimal performance. The first part of this dissertation consists of three reduced complexity algorithms based on the Viterbi Algorithm (VA) which are: the Parallel Trellis VA (PTVA); Time Reverse Reduced State Sequence Estimation (TR-RSSE); and Forward-Backward State Sequence Detection (FBSSD). The second part of the thesis considers structural modifications of the Decision Feedback Equalizer (DFE), which is a special derivative of the VA, specifically, optimal vector quantization for fractionally spaced DFEs, and extended stability regions for baud spaced DFEs using passivity analysis are investigated. ¶ ...
Book chapters on the topic "Decision directed equalizers":
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Sarangi, Archana, Shubhendu Kumar Sarangi, and Siba Prasada Panigrahi. "Adaptive Channel Equalization Using Decision Directed and Dispersion Minimizing Equalizers Trained by Variable Step Size Firefly Algorithm." In Advances in Intelligent Systems and Computing, 301–10. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7566-7_30.
Guo, Yecai, Wencai Xu, Tongying Ji, and Jun Guo. "Support Vector Machines Optimization Based Wavelet Transform Liner Equalizer and Decision Directed Combined Blind Equalization Algorithm." In Frontiers in Computer Education, 957–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27552-4_125.
In this paper, we propose for the 16 quadrature amplitude modulation (QAM) input case, a dual-mode (DM), decision directed (DD) multimodulus algorithm (MMA) algorithm for blind adaptive equalization which we name as DM-DD-MMA. In this new proposed algorithm, the MMA method is switched to the DD algorithm, based on a previously obtained expression for the step-size parameter valid at the convergence state of the blind adaptive equalizer, that depends on the channel power, input signal statistics and on the properties of the chosen algorithm. Simulation results show that improved equalization performance is obtained for the 16 QAM input case compared with the DM-CMA (where CMA is the constant modulus algorithm), DM-MCMA (where MCMA is the modified CMA) and MCMA-MDDMA (where MDDMA is the modified decision directed modulus algorithm).
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Kumari, B. Ratna. "Gender, Culture, and ICT use." In Globalization, Technology Diffusion and Gender Disparity, 36–50. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-0020-1.ch004.
The advent of the new technology was originally seen as a positive development for women’s work. India is one of the largest providers of off- shored BPO activities such as Call Centres services and others which have become emerging workspaces. To a large extent, Information and Communication Technologies (ICTs) hold great promise in the drive for development and poverty reeducation in the global south under the globalization process. It has been dubbed “the great equalizer,” and the spread of IT – enabled services are beneficial for both men and women, those who have limited skills, or a lack of resources. In spite of gender discrimination and gender bias, employees of ICT companies are facing various challenges in their day to day life such as work family interface, health status, mobility in odd hours, and decision making levels. Especially Call Centre jobs have a direct impact on people’s health, interpersonal relationships, and stress on the work environment; they may suffer from loneliness, depression, and anxiety related problems. Therefore, urgent attention should be given towards the increased rate of mental disorders, suicides, and family distortions. Initiation of family counseling centres and other coping and intervention strategies should be implemented for the empowerment of women workers in ICTs.
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Wądolny-Tatar, Katarzyna. "Eko-/socjo-/polityka wrażliwości i gra symetrii (Władca Lewawu, Lustro pana Grymsa)." In Imaginautka zaangażowana. Twórczość i biografia Doroty Terakowskiej z perspektywy XXI wieku, 158–78. Wydawnictwo Naukowe Uniwersytetu Pedagogicznego w Krakowie, 2021. http://dx.doi.org/10.24917/9788380847460.12.
Eco-/socio-/politics of sensitivity and the game of symmetry (Lord of the Lewaw [Władca Lewawu], Mirror of Mr. Gryms [Lustro pana Grymsa]) The title of this article expresses the connectivity and even the inseparability of human ecological and sociological decisions and dependencies, indicating the filiation of these spheres. The “politics of sensitivity” translates into the level of social awareness of the relationship between the eco- and socio-planes. It builds the space of the effect (as it is also a reference to the publication by Michał Paweł Markowski, in which the researcher focuses on the existential turn in the humanities). On the other hand, the “game of symmetry” means striving for completeness, apogee, and harmony in a binary system. It is also a confrontational equation of forces, equalizing deficits resulting from neglect of the environment or human capital, which directs our attention towards the aspects of power and its mechanisms (according to literary studies, this element refers to the title of a sketch by Ireneusz Opacki, in which the Silesian scholar analyzes one of the positivist novels). In Mirror of Mr. Gryms [Lustro pana Grymsa] and Lord of the Lewaw [Władca Lewawu], Dorota Terakowska creates worlds with deficits and confronts the teenage protagonists with the need to eliminate them. The writer shows the relationship between the state of nature and the state of man and takes up the issues of power and its absolutization, perpetuating and magnifying the destruction in the internal and external world of the novel’s characters (in the individual and collective aspect). Both novels contain symmetrical constructive and compositional solutions. In addition, the twinness of the cities described in Lord of the Lewaw causes the symmetrization of the world presented in this novel. The writer also equalizes gender opportunities in terms of influencing the environment. The characters of the teenage heroes from both works, as constructs, are similar both characterologically and in terms of the course of their lives. Both also lose access to one of the lands and the ability to stay there. Agata (Mirror of Mr. Gryms) succumbs to amnesia caused by magicians, and the traces of her stay in another world are only found in fantastic paintings that she creates. The mirror ceases to exist. Bartek-Ketrab (Lord of the Lewaw) does not return to Krakow due to changes in the parameters of the transition between the worlds in which he exists. The heroes return to their families’ places. The changes that are made in the environments they have interfered with seem to be inevitable and positive. The structure of the novels also assumes a perceptive interiorization of the values and the important ecological and social ideas presented in them (sustainable management of natural resources, democracy, freedom).e
Conference papers on the topic "Decision directed equalizers":
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Yellepeddi, Atulya, and James C. Preisig. "Design of decision device for the adaptation of decision directed equalizers." In ICASSP 2013 - 2013 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP). IEEE, 2013. http://dx.doi.org/10.1109/icassp.2013.6638616.
Lee, Won Cheol, Jun Su Park, and Hyung Min Chang. "Space-Time Decision-Directed Equalizer for SIMO Systems based on Affine Projection Algorithm." In APCCAS 2006 - 2006 IEEE Asia Pacific Conference on Circuits and Systems. IEEE, 2006. http://dx.doi.org/10.1109/apccas.2006.342408.
Han, Min-Sik, Sang-Hyuk Yang, Suki Kim, and Shin-Il Lim. "A high-speed differential receiver with low-power interleaved direct decision feedback equalizer." In 2009 International SoC Design Conference (ISOCC). IEEE, 2009. http://dx.doi.org/10.1109/socdc.2009.5423824.
Ghanbarisabagh, M., M. Y. Alias, and H. A. Abdul-Rashid. "Performance analysis of decision feedback time domain equalizer for direct-detection optical OFDM transmission in long-distance SSMF." In 2010 International Conference on Computer and Communication Engineering (ICCCE). IEEE, 2010. http://dx.doi.org/10.1109/iccce.2010.5556787.
Hu, Hao-Jun, Wan-Ning Hsu, and Chih-Peng Fan. "Architecture design of a fast feed-forward blind equalizer with joint generalized multilevel modulus and low-cost soft decision directed scheme for cable modem receiver." In TENCON 2011 - 2011 IEEE Region 10 Conference. IEEE, 2011. http://dx.doi.org/10.1109/tencon.2011.6129151.
Zhao, Zeliang, Xin Wu, Dengjie Wang, Ziqiang Wang, Chun Zhang, Xiangyu Li, and Zhihua Wang. "A 40 Gbps PAM-4 Receiver with 12-Tap Direct Decision Feedback Equalizer Employing 1.5-stage Slicers in 65-nm CMOS." In 2021 IEEE International Conference on Integrated Circuits, Technologies and Applications (ICTA). IEEE, 2021. http://dx.doi.org/10.1109/icta53157.2021.9661649.
Ghanbarisabagh, M., M. Y. Alias, and H. A. Abdul-Rashid. "Performance analysis of Decision Feedback Time-Domain Equalizer for 20.48 Gb/s direct-detection optical OFDM transmission over 2560 km of SMF." In 2010 International Conference on Photonics (ICP). IEEE, 2010. http://dx.doi.org/10.1109/icp.2010.5604384.
