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The performances of the proposed decision-aided maximum likelihood (DA ML) and maximum likelihood sequence detection (MLSD) algorithms are investigated in this paper. It is shown that MLSD significantly improves laser linewidth tolerance. 100 Gb/s DP-QPSK experiments are carried out to verify our results.
The MC-CDMA system achieves a high data rate through MIMO transceivers in frequency selective fading channel. The improvement in the performance and the reduction in complexity of MIMO system will lead to various applications. Hence there is a strong motivation for the high performance with reduced complexity and hardware. The processing of a large number of antennas can be reduced by antenna selection...
For real-time transmission, still image and video sources require wide bandwidths and large storage memory space. Therefore, compression techniques are useful and must be applied to overcome the load variation problem during the transmission and storage. To reconstruct images or video from compressed data without any disruption or losses, two important objective image quality metrics, the peak-signal-to-noise...
Many applications based on variable speed drives require motors to be installed in remote locations, sometimes even inaccessible. This is the case, for example, in oil extraction on subsea environment and underground mining. This paper aims the proposition of an analysis of the applicability of Power Line Communication, when used for data transmission between the supervisory system and remote systems,...
From circuit perspective, the resolution in time domain might be less difficult to achieve as compared to resolution in amplitude domain. Especially when considering Multigigabit communication the resolution in amplitude has remarkable power consumption. In this investigation some practical communication designs are proposed which exploit the utilization of 1- bit quantization and oversampling at...
The demand for faster transmission rates in radio frequency identification has led to the adoption of phase-shiftkeying (PSK) modulations for the communication between the proximity coupled device (PCD) and the proximity integrated circuit card (PICC). This paper derives a transmission model to analyze the intersymbol interference generated by the PCD-to-PICC coupled antennas. An equalizer structure...
We investigate the nonlinear performance of 8QAM-alternative 4D modulation format using GMI to evaluate the BICM capacity. Due to its constant modulus feature, the 4D-2A8PSK modulation has higher nonlinear threshold than Star-8QAM and Circular-8QAM.
Experimental demonstration of an 8-state (Turbo-) Trellis-coded modulation achieving a data throughput of 2 bits/symbol is demonstrated. TTCM outperforms Quadrature Phase Shift Keying with an OSNR gain of 3.8 dB after 1000 km at HD-FEC.
124 GBaud single-carrier based on 4-sub-band transmitter is compared experimentally with 4×30.25 GBaud super-channel solution. Using QPSK and 16QAM in a 125 GHz grid, we evaluate implementation penalties and performance in back-to-back and after long-haul transmission.
The use of multi-stage successive interference cancellation (M-SIC) for super-Nyquist transmission is proposed. Simulation and transmission experiment results showed carrier spacing was reduced by 20% for QPSK signals. Signal performance was enhanced when M-SIC was used with non-uniform power transmission.
The paper puts forward a method of modulation recognition of communication signals based on their correlation characteristics under the ideal gauss white noise conditions. The spectrum peaks' amounts, amplitudes, and location variance of signals' delay correlation and instantaneous correlation were extracted as the feature parameters. As the simulation results shown, compared to other modulation recognition...
We demonstrate 100Gb/s 8D coded modulation transmission over 9,750 km with record high power efficiency as defined by the ratio of capacity-distance product to the total amplifier output power.
We successfully transmitted 100-GHz-grid, 8 channels single-carrier 515.2-Gb/s super-Nyquist signal over 2800-km SMF-28 with EDFA-only amplification. Record all-ETDM-based 136-Gbaud PDM-QPSK is also generated and coherently detected.
This paper introduces novel UL access methods for 5G cellular IoT where devices can directly send a scheduler grant or a small data packet in the contention-based (CB) manner. The novelty of this work is in the combination of medium access control (MAC) contention access with physical layer optimization with new numerology applied to single carrier frequency division multiple access (SC-FDMA) waveforms...
During the design phase of the Q/V-band ground station in Graz/Austria for the Alphasat TDP5 adaptive coding and modulation (ACM) communication experiment, which is based on the DVB-S2 standard, a tool for accurate SNR measurements with high time resolution was needed. State of the art DVB-S2 demodulators with built-in SNR estimators did not satisfy the requirements because the algorithms were not...
A multiple-layer-overlay (MLO) modulation format is employed for a 14-km optical fiber link and an enhanced spectral efficiency of 2.36 bits/s/Hz is achieved by multiplexing 3-layer signals with each layer carrying a 2-Gbit/s QPSK signal.
This research addresses the issue of resource and power allocation in small cell networks, and focuses on two aspects: i) the interference coordination among cells; and ii) the resource allocation among the users served by the same cell. Due to the density of small cells, centralised interference coordination schemes require an enormous level of communication among cells. Fuzzy logic (FL) is a promising...
Various of multicarrier modulation scheme may be used to bit rate increases of Broadband PLC channel. One of the schemes is the Pulse-Shaped OFDM (PS-OFDM). There is an important parameter in the PS-OFDM that influence the increasing in bit rate on the PLC channel, the guard interval, and the number of subchannels. This paper discusses performance of the system against the effects of code rate, multipath...
Signal-to-noise ratio (SNR) is an important parameter of channel quality. The performance of adaptive communications in time-varying channels is affected significantly by the SNR estimation accuracy. In this paper, the new methods of SNR estimation for PSK and QAM are proposed. The methods are based on maximum likelihood estimation (MLE) using the probability density function (pdf) of received signal...
A robust data-aided (DA) signal-to-noise ratio (SNR) estimation algorithm in the time domain is proposed in this paper, aiming at the volatile Doppler shift and carrier wave phase offset under dynamical scenarios for M-ary phase shift keying (MPSK) over the flat-fading complex channel. The proposed algorithm exploits data aided, delay conjugate multiplies the received signal, converts Doppler shift...
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