scholarly journals Design of Software-Defined Radio-Based Adaptable Packet Communication System for Small Satellites

Aerospace ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 159
Author(s):  
Yasir M. O. ABBAS ◽  
Kenichi Asami
Keyword(s):  
Software Defined Radio ◽  
Communication Systems ◽  
Signal To Noise Ratio ◽  
Data Rate ◽  
Channel Noise ◽  
Modulation Scheme ◽  
Small Satellites ◽  
Feedback Message ◽  
Data Rates ◽  
Shift Keying

Software-defined radio (SDR) devices have made a massive contribution to communication systems by reducing the cost and development time for radio frequency (RF) designs. SDRs opened the gate to programmers and enabled them to increase the capabilities of these easily manipulated systems. The next step is to upgrade the reconfigurability into adaptability, which is the focus of this paper. This research contributes to improving SDR-based systems by designing an adaptable packet communication transmitter and receiver that can utilize the communication window of CubeSats and small satellites. According to the feedback from the receiver, the transmitter modifies the characteristics of the signal. Theoretically, the system can adopt many modes, but for simplicity and to prove the concept, here, the changes are limited to three data rates of the Gaussian minimum shift keying (GMSK) modulation scheme, i.e., 2400 bps GMSK, 4800 bps GMSK and 9600 bps GMSK, which are the most popular in amateur small satellites. The system program was developed using GNU Radio Companion (GRC) software and Python scripts. With the help of GRC software, the design was simulated and its behavior in simulated conditions observed. The transmitter packetizes the data into AX.25 packets and transmits them in patches. Between these patches, it sends signaling packets. The patch size is preselected. Alternatively, the receiver extracts the data and saves it in a dedicated file. It directly replies with a feedback message whenever it gets the signaling packets. Based on the content of the feedback message, the characteristics of the transmitted signal are altered. The packet rate and the actual useful data rate are measured and compared with the selected data rate, and the packet success rate of the system operating at a fixed data rate is also measured while simulating channel noise to achieve the desired Signal-to-Noise Ratio (SNR).

scholarly journals In-Band OSNR Measurement Method for All-Optical Regenerators in Optical Domain

2019 ◽  
Vol 9 (24) ◽  
pp. 5438
Author(s):  
Feng Wan ◽  
Baojian Wu ◽  
Feng Wen ◽  
Kun Qiu
Keyword(s):  
Measurement Method ◽  
Signal To Noise Ratio ◽  
Optical Signal ◽  
Error Vector Magnitude ◽  
Regeneration System ◽  
Data Rates ◽  
All Optical ◽  
Communication Links ◽  
Shift Keying ◽  
Nonlinear Devices

We propose an in-band measurement method of optical signal-to-noise ratio (OSNR) output from an all-optical regeneration system with a nonlinear power transfer function (PTF) according to the fact that there are different average gains of signal and noise. For the all-optical quadrature phase-shift keying (QPSK) regenerator as an example, the output OSNR is derived from the input OSNR and the total gain of the degraded QPSK signal. Our simulation shows that the OSNR results obtained by this method are in agreement with those calculated from the error vector magnitude (EVM) formula. The method presented here has good applicability for different data rates but is also useful for analyzing the OSNR degradation of other nonlinear devices in optical communication links.

scholarly journals A reconfigurable software defined ultra-wideband impulse radio transceiver

2010 ◽  
Vol 8 ◽  
pp. 67-73 ◽  
Author(s):  
M. D. Blech ◽  
A. T. Ott ◽  
P. Neumeier ◽  
M. Möller ◽  
T. F. Eibert
Keyword(s):  
Software Defined Radio ◽  
Matched Filter ◽  
Digital Signal ◽  
Impulse Radio ◽  
Ultra Wideband ◽  
Modulation Scheme ◽  
Digital To Analog Converter ◽  
Shift Keying ◽  
Reconfigurable Software ◽  
Radio Transceiver

Abstract. An ultra-wideband (UWB) software defined radio (SDR) implementation is presented. The developed impulse radio (IR) transceiver employs first order bandpass (BP) sampling at a conversion frequency which is four times the channel bandwidth. The subsampling architecture directly provides the RF signal avoiding any non-ideal mixer stages and reduces the requirements of digital signal processing implemented in a field programmable gate array (FPGA). The transmitter consists basically of a multi-Nyquist digital to analog converter (DAC), whereas the implemented matched filter (MF) receiver prototype employs a standard digitizing oscilloscope. This design can be adaptively reconfigured in terms of modulation, data rate, and channel equalization. The reconfigurable design is used for an extensive performance analysis of the quadrature phase shift keying (QPSK) modulation scheme investigating the influence of different antennas, amplifiers, narrowband interferers as well as different equalizer lengths. Even for distances up to 7 m in a multipath environment robust communication was achieved.

A NEW DATA RATE ADAPTION COMMUNICATIONS SCHEME FOR CODE-SHIFTED DIFFERENTIAL CHAOS SHIFT KEYING MODULATION

2012 ◽  
Vol 22 (08) ◽  
pp. 1250201 ◽  
Author(s):  
W. K. XU ◽  
L. WANG ◽  
G. KOLUMBÁN
Keyword(s):  
Gaussian Approximation ◽  
Time Slot ◽  
Data Rate ◽  
Modulation Scheme ◽  
Noise Performance ◽  
Walsh Code ◽  
Shift Keying ◽  
Multilevel Modulation ◽  
Chaos Shift Keying ◽  
Differential Chaos Shift Keying

In a binary Transmitted Reference (TR) system each bit is encoded into two wavelets of finite duration. The information is transmitted by the sign of correlation measured between the two wavelets. The Code-Shifted Differential Chaos Shift Keying (CS-DCSK) modulation scheme transmits the two wavelets in the same time slot and applies two Walsh code sequences to keep the wavelets separated. The CS-DCSK modulation scheme is generalized here by transmitting more than one information bearing wavelets with one reference. The orthogonality of wavelets is assured by different Walsh code sequences. The new Generalized CS-DCSK (GCS-DCSK) scheme is a multilevel modulation where the symbol period is kept constant but the data rate can be varied in an adaptive manner by adding new or removing existing information bearing wavelets, each of them is isolated by Walsh code. Exploiting the Gaussian approximation, an analytical expression is derived for the noise performance of GCS-DCSK modulation. Its accuracy is verified by computer simulation.

scholarly journals 5G UFMC Scheme Performance with Different Numerologies

Electronics ◽  
2021 ◽  
Vol 10 (16) ◽  
pp. 1915
Author(s):  
Lambros Sakkas ◽  
Eleftherios Stergiou ◽  
Georgios Tsoumanis ◽  
Constantinos T. Angelis
Keyword(s):  
Mobile Communications ◽  
Bit Error Rate ◽  
Communication Systems ◽  
Modulation Scheme ◽  
Fifth Generation ◽  
Data Rates ◽  
The World ◽  
Simulation Results ◽  
5G Systems ◽  
Ber Performance

5G is the latest mobile communications standard that is spreading fast across the world. Recently defined requirements for 5G systems have led to higher applications’ requirements regarding data rates, lower requirements for latency, and higher efficiency regarding the spectrum usage. Universal Filtered Multi-Carrier (UFMC) is one new candidate modulation scheme for emergent Fifth Generation (5G) communication systems. This paper focuses on Universal Filtered Multi-Carrier (UFMC) design aspects in terms of Bit Error Rate (BER) performance in relation to the filter length used in subband filtering. Simulation results show that BER and CCDF performance varies for different filter lengths and modulation schemes. The main achievement of this work is that the results show that different Dolph–Chebyshev FIR filter lengths do not affect the BER performance both for the 64 and 256 QAM.

scholarly journals Analysis and Design of Network-Based Control Systems with Binary Modulation

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Shunli Zhao ◽  
Xunhe Yin ◽  
Xueye Wei
Keyword(s):  
Control Systems ◽  
Signal To Noise Ratio ◽  
Channel Noise ◽  
Linear Matrix ◽  
Computer Communication ◽  
Analysis And Design ◽  
The Past ◽  
Binary Modulation ◽  
Shift Keying ◽  
The Stability

Network-based control systems have been emerging technologies in control and computer communication fields over the past decade. This paper focuses on the analysis and design of network-based control systems with binary modulation. First, it is shown that different modulations can result in different delays which are inevitable in network-based control systems. The delay can be seen as constant delay when the transmission time is the main consideration. Second, channel noise can result in bit error while bit error is seen as active packet loss in this paper, in this context, the conditions of signal-to-noise ratio (SNR) for binary modulation that can guarantee the stability of systems are obtained according to the proposed algorithm. Third, the system with delay and noisy communication can be modeled as an asynchronous dynamic system (ADS); in addition, the stability is analyzed and controller is designed in terms of Lyapunov function and linear matrix inequality (LMI) scheme. Finally, without loss of generality, numerical simulation demonstrates the effectiveness of the proposed scheme and designed controller based on binary amplitude shift keying (2ASK) modulation.

scholarly journals Performance Research on Variable Data Rate Reconfigurable Architecture for SDR Receiver

2019 ◽  
Vol 8 (2S8) ◽  
pp. 1008-1011
Keyword(s):  
Software Defined Radio ◽  
Data Rate ◽  
Reconfigurable Architecture ◽  
Bandwidth Efficiency ◽  
High Data ◽  
Modulation And Demodulation ◽  
Data Rates ◽  
Modulation Schemes ◽  
Variable Data ◽  
Amplitude And Frequency Modulation

In Early days, communications systems used amplitude and frequency modulation schemes in which bandwidth constraint is one of the major challenge to accommodate more data rates. As the data rate requirement increased drastically till date, The applications demands more data rates for communication using less bandwidth is considered as an efficient communication system. For achieving communication with high data rates using less bandwidth, technology migrated to digital modulation schemes. In this phase new modulation techniques like ASK, FSK, PSK were realised. ASK and FSK modulation schemes bandwidth efficiency is less as compared to PSK schemes. For best utilisation of bandwidth efficiency and less inherent noise levels, PSK schemes are used, which is suitable for high data rate applications. In this paper QPSK modulation and demodulation technique is selected for realising the variable data rate in the range of 1.2MBPS as the best bandwidth with efficient reconfigurable architecture designed for software defined radio receiver.

A Noise Eliminating Method of DCSK System Based on Multi-Layered Noise Control Materials

2012 ◽  
Vol 461 ◽  
pp. 164-168
Author(s):  
Zhen Chao Wang ◽  
Shi Bing Zhang ◽  
Yuan Yuan Liu
Keyword(s):  
Communication Systems ◽  
Colored Noise ◽  
Low Voltage ◽  
Reversed Phase ◽  
Channel Noise ◽  
Power Line Communication ◽  
Shift Keying ◽  
Communication Scheme ◽  
Simulation Results ◽  
Chaos Shift Keying

This paper proposes a new chaotic communication scheme which is developed from Differential Chaos Shift Keying (DCSK), named reversed-phase overlay DCSK. Different from DCSK, at the receiver of the improved scheme the first and the second half-symbol signals within a code period are reversed-phase overlapped before the correlation operation. Both the theoretical analysis and the simulation results show that the proposed scheme can effectively suppress the noise and improve the BER performance of DCSK if the channel noise in the first half of a code period and the second is positively correlated. The proposed scheme can be applied to the communication systems suffering with colored noise, such as Low-voltage Power Line Communication(L-PLC) system

scholarly journals A printed millimetre-wave modulator and antenna array for backscatter communications at gigabit data rates

2021 ◽  
Author(s):  
John Kimionis ◽  
Apostolos Georgiadis ◽  
Spyridon Nektarios Daskalakis ◽  
Manos M. Tentzeris
Keyword(s):  
Phase Shift ◽  
Antenna Array ◽  
Communication Systems ◽  
High Electron ◽  
Phase Shift Keying ◽  
Modulation Formats ◽  
Millimetre Wave ◽  
Front End ◽  
Data Rates ◽  
Shift Keying

AbstractFuture devices for the Internet of Things will require communication systems that can deliver higher data rates at low power. Backscatter radio—in which wireless communication is achieved via reflection rather than radiation—is a low-complexity approach that requires a minimal number of active elements. However, it is typically limited to data rates of hundreds of megabits per second because of the low frequency bands used and the modulation techniques involved. Here we report a millimetre-wave modulator and antenna array for backscatter communications at gigabit data rates. This radiofrequency front-end consists of a microstrip patch antenna array and a single pseudomorphic high-electron-mobility transistor that supports a range of modulation formats including binary phase shift keying, quadrature phase shift keying and quadrature amplitude modulation. The circuit is additively manufactured with inkjet printing using silver nanoparticle inks on a flexible liquid-crystal polymer substrate. A millimetre-wave transceiver is also designed to capture and downconvert the backscattered signals and route them for digital signal processing. With the system, we demonstrate a bit rate of two gigabits per second of backscatter transmission at millimetre-wave frequencies of 24–28 GHz, and with a front-end energy consumption of 0.17 pJ per bit.

scholarly journals Examination of Different PAPR Minimization Techniques for MIMO-OFDM System

2019 ◽  
Vol 9 (2S3) ◽  
pp. 98-101
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Modulation Scheme ◽  
Ofdm Systems ◽  
Ofdm System ◽  
Reduction Techniques ◽  
Huge Data ◽  
Data Rates ◽  
Mimo Ofdm ◽  
Selective Mapping

In this article an analysis on different PAPR minimizing schemes for MIMO-OFDM based wireless communication systems like clipping, selective mapping (SLM) and Partial Transmit Sequence (PTS) are presented. Several properties of OFDM maintain an appealing modulation scheme to support huge data rates in MIMO-OFDM based transmission used in wireless communication system. Apart from several advantages one principle drawback of the OFDM system is it produces huge values of PAPR. The PAPR can be minimized using few schemes like clipping, coding, peak windowing and tone reservation. Simulation results can give the examination between the different PAPR reduction techniques and can give the scope for analyze the different techniques based on different parameters like CCDF values and BER performance with respect to the variation in number sub carriers used for transmission However, huge number of these plans are not able to give a huge degradation in the PAPR by a low computational complexity, but the SLM technique provides essentially better attainment than the other schemes for MIMO-OFDM systems.

scholarly journals Improved Hybrid Precoder Design for Secure mmWave MIMO Communications

2020 ◽  
Vol 26 (4) ◽  
pp. 72-77 ◽  
Author(s):  
Yasin Kabalci ◽  
Muhammad Ali
Keyword(s):  
Communication Systems ◽  
Signal To Noise Ratio ◽  
Phase Shifters ◽  
Propagation Loss ◽  
System Capacity ◽  
High Signal ◽  
Secrecy Rate ◽  
Low Snr ◽  
Recent Approach ◽  
Data Rates

Key challenges of emerging mobile communication systems are to provide higher data rates, diverse device connectivity, low latency, higher system capacity, and low energy consumption. The communication systems exploiting the millimeter-wave (mmWave) band are realized to resolve thereof inevitable issues. However, security is considered as one of the challenging issues in mmWave communication in addition to unavoidable problems (e.g., propagation loss, penetration loss, and fading). This study aims to construct efficient secure hybrid precoder with low-resolution phase shifters that can protect legitimate information from eavesdropping by employing coordinated analog precoder and combiner algorithms and improve the secrecy rate. Moreover, in order to further enhance the secrecy rate, hybrid precoder are obtained using an efficient channel. This work compares its results with the recent approach reported in the literature, which indicates that our proposed model outperforms at high signal-to-noise ratio (SNR) values, while our model provides similar performance at low SNR values. Simulation studies also confirm the effectiveness of the proposed hybrid precoder to achieve maximum secrecy rate.

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