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This paper proposes the performance analysis of different transmission waveforms employed for fish monitoring by active ultrasound systems. The obtained results are analyzed both qualitatively and quantitatively in terms of frame rate, Signal-to-Noise Ratio and resolution at the reception.
This paper proposes an incremental redundancy hybrid ARQ (IR-HARQ) scheme for the wireless local area network (WLAN) system employing multiband simultaneous transmission. The proposed scheme adopt the rate compatible low-density parity-check (RC-LDPC) codes based on IEEE802.11n LDPC codes and ensure backward compatibility with WLAN devices by using the current WLAN control frame. Additionally, it...
We propose and experimentally demonstrate a radio-over-fiber (RoF) system employing subcarrier-index modulation (SIM) orthogonal-frequency-division multiplexing (OFDM) signal. Thanks to the introduction of a new freedom in terms of SIM, a robust and energy-effective transmission solution is achieved for the RoF system. In the experiments, the 8-GHz QPSK-SIM-OFDM and conventional QPSK-OFDM signals...
Estimation is a critical component of synchronization in wireless and signal processing systems. There is a rich body of work on estimator derivation, optimization, and statistical characterization from analytic system models which are used pervasively today. We explore an alternative approach to building estimators which relies principally on approximate regression using large datasets and large...
Reconfigurable terminals capable of adapting their transmission parameters such as modulation scheme, data and coding rates are desired to enhance the quality of service along with energy and spectral efficiency. However, spectrum bandwidth and time delay constraints limit the explicit sharing of these parameters and hence, they need to be estimated blindly. Though significant work has been done in...
This paper focuses mainly on Bit Error Rate (BER), Signal to Noise Ratio and different Rayleigh channels. We have designed four Rayleigh channels. This paper describes the comparative analysis of different digital modulation techniques like BPSK, QPSK, 8PSK, 16PSK and 16QAM for four Rayleigh channels which are designed. We also compare the convolution coding with different code rates i.e. 1/2, 1/3...
An eight-channel multi-format coherent optical transceiver is proposed as an alternative to implement terabit metro inter-data centre interconnects (DCI) transmitting from 800 to 1600 Gb/s over conventional single mode fibre (CSMF). The maximum reach of the system as a function of transmitted power and overall capacity is numerically estimated for a BER target of 1×10−13, avoiding the use of optical...
A CPE aiming at the low SNR region and targeting PSK formats encoded with a low-rate FEC is evaluated for the first time. Via numerical simulation of a 53.6 Gbaud DP-QSPK signal with a coding rate of 0.48, we confirm that pilot-aided CPE achieves a 0.3 dB SNR improvement over a typical blind CPE at a low-rate FEC Q-limit of 1.2 dB.
We study the semi-coherent detection of a novel communication mechanism, ambient backscatter, where detection-required parameters can be obtained from unknown data symbols and a few pilot symbols. To release dependence on prior knowledge of ambient signals, we propose a type of robust design, called energy detector, with the ambient signal being either complex Gaussian (CG) or phase shift keying (PSK)...
We proposed a novel circular 16QAM modulation format for achieving better phase noise tolerance and transmission performance compared to the conventional square 16QAM format. The simulation shows that the phase noise tolerance at 1dB penalty are improved by 1.63 times and 35% maximum transmission reach are gained, respectively.
The growing demand for voice and multimedia services on wireless communication spur the advancement of efficient error detection and correction coding techniques. The error correcting capability of any encoding technique depends on the number of parity bits added and position, where the parity bits are placed. Low density parity check code having sparse parity check matrix provides the ability to...
To support forthcoming flexible coherent transport, we demonstrate a multiple-structured spatially-coupled LDPC with BCH codes which offers modulation flexibility, rate-adaptability and pilot-aided cycle-slip mitigation.
We propose the use of differential code shift keying (DCSK) for a symbol rate adaptive low-complexity DSP algorithm by eliminating adaptive-equalizer (AEQ) with limited influence on circuit size. As a proof of concept, a 300km transmission using DCSK format was demonstrated without using AEQ.
Modulation scheme detection of blind signal is vital area of research now a days because of the requirement in security and communication applications. In this paper, modulation class is identified based on the constellation graphical representation. Carrier frequency, symbol rate and phase offset are the essential parameters required for the extraction of constellation diagram, which are calculated...
Homogeneous single-mode multi-core fibers (MCF) offer the potential for a dramatic increase of the per-fiber capacity in long-haul optical communication systems [1, 2]. Inter-core crosstalk, resulting from unwanted core coupling can limit the achievable data rates and transmission distance [3]. It has been found that short-term average crosstalk (STAX) may vary randomly over time and frequency by...
The effectiveness analysis of the mismatched sidelobe-free filter for compression of phase-shift keyed signals is performed. At that the various types of phase-shift keying codes were considered. The comparative analysis of compression effectiveness of phase-shift keyed signals is carried out. For codes of different lengths, the pairs with the mismatched sidelobe-free filter were found, providing...
A novel single carrier frequency domain channel equalizer (SC-FDE) based on discrete wavelet transform (SC-DWT-FDE) has been proposed to improve the performance of conventional SC-FDE in this paper. Computer simulations have been performed to verify the performance of the proposed method in stationary and non-stationary frequency selective Rayleigh fading channels. The obtained simulation results...
Cognitive radio (CR) is the key technology that provides to use frequency spectrum effectively. Spectrum sensing, a critical function of CR, detects spectrum holes. Energy based detection (ED) is the most preferred spectrum sensing technique by researchers because it only requires the energy of received signals. The sensing performance of the ED is mainly based on the wireless communication channel...
In this paper, a phase-locked loop structure is designed for subcarrier synchronization in orthogonal frequency division multiplexing (OFDM) systems. A phase-locked loop (PLL) structure is designed according to optimum phase noise and acquisition time specifications. Digital video broadcasting-terrestrial (DVB-T2k) parameters are taken as reference. The trade-off between the acquisition time and phase...
In this paper, 400 Gbps Tests - which take place in ITU's Roadmap of 2018 and have been never tried on a live network, according to literature review- are applied to Turk Telekom Live Network, within a distance of 1060/2120 kilometers (between Istanbul and Ankara, round-trip/between Istanbul - Ankara, twice round-trip) and changes on Optical Signal-to-Noise Ratio (OSNR) are observed by changing the...
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