Results 21 to 30 of about 574 (170)
Performance of OFDM: FSO Communication System with Hybrid Channel Codes during Weak Turbulence
Journal of Computer Networks and Communications, Volume 2019, Issue 1, 2019., 2019 The performance of orthogonal frequency division multiplexing‐ (OFDM‐) based free‐space optics (FSO) depends on various parameters such as number of subcarriers, base band modulation, nature of laser beam, turbulence modelling, and much more. Various diversity techniques have been studied by researchers for the improvement of signal strength due to ...
Ritu Gupta +3 more
wiley +1 more source
Channel Coding for Multi‐Carrier Wireless Partial Duplex
Wireless Communications and Mobile Computing, Volume 2019, Issue 1, 2019., 2019 In order to leverage the spectrum resources, several forms of wireless duplex have been introduced and investigated in recent years. In Partial Duplex (PD) schemes, part of the band is transmitted in Full‐Duplex (FD) and the rest in Half‐Duplex (HD); therefore, some transmitted symbols will be characterized, at the receiver, by high SNR (Signal‐to ...
Hamid R. Barzegar +2 more
wiley +1 more source
EXIT Chart Aided Design of Near-Capacity Self-Concatenated Trellis Coded Modulation Using Iterative Decoding, [PDF]
, 2008 In this contribution we design the Iteratively Decoded Self-Concatenated Convolutional Codes (SECCC-ID) using Extrinsic Information Transfer (EXIT) charts.
Muhammad Fasih Uddin Butt +5 more
core +1 more source
Coplanar Turbo‐FSK: A Flexible and Power Efficient Modulation for the Internet‐of‐Things
Wireless Communications and Mobile Computing, Volume 2018, Issue 1, 2018., 2018 As the Internet‐of‐Things (IoT) has expanded, multiple solutions have attempted to address the issues of the Low Power Wide Area (LPWA) networks physical layer. In a previous work, we proposed the Turbo‐FSK, a constant envelope modulation with orthogonal alphabet that allows the receiver to operate at very low levels of power (high sensitivity ...
Yoann Roth +4 more
wiley +1 more source
Capacity-Approaching Non-Binary Turbo Codes: A Hybrid Design Based on EXIT Charts and Union Bounds
IEEE Access, 2018 In this paper, we introduce a novel design approach for capacity-approaching non-binary turbo codes. There are two important factors that impact the performance of turbo codes in general: 1) the convergence behavior of iterative decoding in the low ...
Toshiki Matsumine, Hideki Ochiai
doaj +1 more source
Superposition Coded Modulation Based Faster‐Than‐Nyquist Signaling
Wireless Communications and Mobile Computing, Volume 2018, Issue 1, 2018., 2018 A structure of faster‐than‐Nyquist (FTN) signaling combined with superposition coded modulation (SCM) is considered. The so‐called FTN‐SCM structure is able to achieve the constrained capacity of FTN signaling and only requires a low detection complexity. By deriving a new observation model suitable for FTN‐SCM, we offer the power allocation based on a
Shuangyang Li +5 more
wiley +1 more source
Nonuniform Code Multiple Access
Wireless Communications and Mobile Computing, Volume 2018, Issue 1, 2018., 2018 For sparse code multiple access advanced (SCMAA), the quality of initial information on each resource node and the convergence reliability of the detected user in each decision process were unsatisfactory at the message passing algorithm (MPA) receiver. Driven by these problems, this paper proposes a nonuniform code multiple access (NCMA) scheme.
Cheng Yan +3 more
wiley +1 more source
IEEE Photonics Journal, 2019 In this paper, a low-density parity check (LDPC) coded GFDM with high-level modulation scheme is proposed for more flexible and advanced multicarrier modulation in intensity-modulated/direct-detection (IM/DD) optical systems.
Dong Guo +10 more
doaj +1 more source
Journal of Engineering, Volume 2016, Issue 1, 2016., 2016 This paper presents a possible simulation of negative effects in the optical transmission medium and an analysis for the utilization of different signal processing techniques at the optical signal transmission. An attention is focused on the high data rate signal transmission in the optical fiber influenced by linear and nonlinear environmental effects
Filip Čertík +2 more
wiley +1 more source
Turbo Trellis Coded Modulation (TTCM) with Imperfect Phase Reference
Electrica, 2019 In this paper, we investigate the performance of Turbo Trellis Coded Modulation (TTCM) over AWGN, and Rician channels and assume that phase disturbance is available.
Osman N. Ucan, Onur Osman
doaj +2 more sources