Short Block Code Concatenated with a Permutation Code for Narrowband PLC Communication Systems

2019 ◽  
Author(s):  
Safa Najjar ◽  
Fatma Rouissi ◽  
Hela Gassara ◽  
A. J. Han Vinck ◽  
Adel Ghazel
Keyword(s):  
Communication Systems ◽  
Block Code ◽  
Permutation Code

scholarly journals Efficient Turbo Inter-Leaver Based MIMO-OFDM System For Low Complexity Outdoor Communication

2019 ◽  
Vol 9 (1) ◽  
pp. 3154-3162
Keyword(s):  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
Mimo System ◽  
Block Code ◽  
Low Complexity ◽  
Turbo Coding ◽  
Maximum Ratio Combining ◽  
High Data ◽  
Coding Scheme ◽  
Multiple Paths

An arrangement of multiple antennas in both the receiver and transmitter called Multiple Input and Multiple Output (MIMO). The Orthogonal Frequency Division Multiplexing (OFDM) is enabled in MIMO system for high data wireless communications. Combination of both MIMO and OFDM Access (OFDMA) is a growing technology in next generation communication systems. In this work, the Bit Error Rate (BER) performance of MIMO-OFDMA is analyzed with Orthogonal Space Time Block Code (OSTBC), Maximum Ratio Combining (MRC) and Turbo coding scheme over flat fading channel are named as MIMO-MRC-OFDMA. OSTBC is a transmit diversity scheme, which is utilized for delivering an efficient transmission with high peak data rates that significantly improves the capacity of communication systems. Successively, the MRC diversity solves transmit and receive diversity from an OSTBC. MRC approach is applied in the receiving end for summing and weighing the received signals from the multiple paths. Besides, turbo coding scheme is utilized for error correction in a given code rate. The proposed system performance is evaluated in light of BER by varying the number of receive and transmit antennas such as 2×2, 2×4, 4×2 and 4×4

Performance Evaluation of Full Diversity QOSTBC MIMO Systems with Multiple Receive Antenna

2013 ◽  
pp. 274-284
Author(s):  
Hardip K. Shah ◽  
Tejal N. Parmar ◽  
Nikhil Kothari ◽  
K. S. Dasgupta
Keyword(s):  
Communication Systems ◽  
Mimo Systems ◽  
Block Code ◽  
Block Codes ◽  
Space Time ◽  
Least Square ◽  
Time Block ◽  
Space Time Block Codes ◽  
Full Diversity ◽  
Full Rate

Multipath fading is inherent in wireless communication systems. Diversity is the technique which takes advantage of multipath to mitigate the effect of fading and increase signal strength. Space Time Block codes (STBC) are used in MIMO systems to improve the performance by maximizing transmit and/or receive diversity. Among different schemes based on STBC, Quasi Orthogonal Space Time Block Code (QOSTBC) is able to achieve full rate transmission for more than two transmit antennas. Constellation Rotation QOSTBC (CR-QOSTBC) achieves full diversity and improves performance further along with full rate, to overcome the limitation of QOSTBC, which is unable to maintain orthogonality amongst the codes transmitted by different antennas. Higher diversity can be achieved by increasing uncorrelated paths between transmitter and receivers using higher number of receive antennas. This paper examines improvement in BER with reference to a number of receive antennas. Simulations were carried out under ideal as well as realistic environments, using least square technique with four antennas at transmitter side and variable receive antennas. Results of simulations presented in this paper indicate performance improvement of CR-QOSTBC over QOSTBC in flat fading channel environment. Simulation results also show performance degradation in BER when channel is estimated at the receiver.

scholarly journals Studying and Modeling the Performance of the TCM-STBC Systems in the Rayleigh Channel

2021 ◽  
Vol 1 ◽  
pp. 1-7
Author(s):  
Mohammed Sofiane Bendelhoum ◽  
Mohamed Rida Lahcene ◽  
Fayssal Menezla ◽  
Abderraouf Elarbi
Keyword(s):  
Communication Systems ◽  
Mimo Systems ◽  
Multiple Input Multiple Output ◽  
Block Code ◽  
Space Time ◽  
Performance Comparison ◽  
Coded Modulation ◽  
Rayleigh Channel ◽  
Input Multiple Output ◽  
Matrix Codes

Multiple-input multiple-output (MIMO) systems will play an important role in future generations of wireless networks. Space-time block code (STBC) and space-time trellis code (STTC) are two techniques that may be used in multi-antenna radio systems. This paper aims, most importantly, to study the performance of STBC systems at different vallues of such parameters as spectral efficiency, matrix codes and constellations. A performance comparison between STBC and STTC schemes is performed. In order to show the efficiency of the system’s ability to communicate with uncoded and coded transmission structures over AWGN and Rayleigh channels, the trellis-coded modulation (TCM) is introduced. The results obtained show that the proposed TCM-STBC system model, using one and two receiving antennas, improves the performance of Rayleigh channel communication systems at 9.5 dB and 11.5 dB for a BER of 10−5

scholarly journals Improvement of FER using Differential Space-Time Block Code

2020 ◽  
Vol 8 (5) ◽  
pp. 4144-4148
Keyword(s):  
Communication Systems ◽  
Mimo Systems ◽  
Mimo System ◽  
Radio Channel ◽  
Block Code ◽  
Space Time ◽  
Coherent Detection ◽  
Doppler Spectrum ◽  
Time Block ◽  
Space Time Block Code

Over recent years, various modulation and coding techniques have been proposed in MIMO wireless communication systems. A MIMO system uses the concept of spatial diversity which is very successful and promising technique. When a coherent transmission system is considered, the estimation of radio channel impulse response is done precisely. In MIMO systems, the radio channel is estimated among every transmitting and receiving antennas such that the complexity can be increased. For this reason, in MIMO systems differential modulation schemes are estimated. A Differential Space-Time Block Code (DSTBC) is useful in the Raleigh fading channel as they do not require channel estimates. Space-time coding with MIMO antennas at transmitting and receiving reduces the consequences of fading in multiple paths and therefore the performance of digital transmission throughout wireless radio channel can be improved. So it has been presumed that perfect CSI is available at the receiver and coherent detection is employed. This paper presents improvement of Frame Error Rate (FER) for differential space-time block code using various Doppler spectra. When the channels estimates are not available the DSTBC system noticed that at SNR of 10 dB, for two transmitting and four receiving antennas the FER is 0.0067 for rounded Doppler spectrum. The differential schemes attains full transmit diversity owing to orthogonal designs. However, the receiver or the transmitter needs the channel state information so these differential schemes are 3 dB worse than the STBC with coherent detection.

scholarly journals On the Symbol Error Probability of STBC-NOMA with Timing Offsets and Imperfect Successive Interference Cancellation

Electronics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1386
Author(s):  
Muhammad Waseem Akhtar ◽  
Syed Ali Hassan ◽  
Haejoon Jung
Keyword(s):  
Interference Cancellation ◽  
Communication Systems ◽  
Multiple Access ◽  
Error Probability ◽  
Asymptotic Expression ◽  
Block Code ◽  
User Cooperation ◽  
Symbol Error Probability ◽  
High Data ◽  
And Performance

Due to the ability to handle a large number of users, low latency, and high data rates, NON-orthogonal multiple access (NOMA) is considered a promising access technology for next-generation communication systems. However, as the number of users increases, each user experiences a greater number of successive interference cancellations (SIC), causing the system’s performance to decline. With the increase in the number of users, the fraction of power allocated to each user becomes smaller. Cooperative communication in downlink NOMA is considered as a potential approach to enhance the reliability, capacity, and performance over wireless channels. Space-time block code (STBC)-aided cooperative NOMA (CNOMA) offers an opportunity to improve the weak users’ signal-to-interference-plus-noise (SINR) through strong user cooperation. In this paper, we study the symbol error probability (SEP) performance of the STBC-NOMA and derive the asymptotic expression for SEP when the network is impaired with imperfect SIC (ipSIC) and timing offsets. The simulation results show that the performance of STBC-NOMA was degraded significantly with an increase in the imperfection of SIC and timing errors and that traditional orthogonal access schemes, such as orthogonal frequency division multiple access (OFDMA) and time division multiple access (TDMA), should be used after a threshold SIC level.

scholarly journals Gallager Exponent Analysis of Coherent MIMO FSO Systems over Gamma-Gamma Turbulence Channels

Entropy ◽  
2020 ◽  
Vol 22 (11) ◽  
pp. 1245
Author(s):  
Maoke Miao ◽  
Xiaofeng Li
Keyword(s):  
Fading Channels ◽  
Upper Bound ◽  
Communication Systems ◽  
Large Scale ◽  
Mimo Systems ◽  
Multiple Input Multiple Output ◽  
Block Code ◽  
Ergodic Capacity ◽  
High Signal ◽  
Free Space Optical

This paper studies the Gallager’s exponent for coherent multiple-input multiple-output (MIMO) free space optical (FSO) communication systems over gamma–gamma turbulence channels. We assume that the perfect channel state information (CSI) is known at the receiver, while the transmitter has no CSI and equal power is allocated to all of the transmit apertures. Through the use of Hadamard inequality, the upper bound of the random coding exponent, the ergodic capacity and the expurgated exponent are derived over gamma–gamma fading channels. In the high signal-to-noise ratio (SNR) regime, simpler closed-form upper bound expressions are presented to obtain further insights into the effects of the system parameters. In particular, we found that the effects of small and large-scale fading are decoupled for the ergodic capacity upper bound in the high SNR regime. Finally, a detailed analysis of Gallager’s exponents for space-time block code (STBC) MIMO systems is discussed. Monte Carlo simulation results are provided to verify the tightness of the proposed bounds.

A Parallel Space-Time Block Code Based Transmission Scheme

2012 ◽  
Vol 605-607 ◽  
pp. 1959-1964
Author(s):  
Feng Hu ◽  
Li Biao Jin ◽  
Jian Zeng Li
Keyword(s):  
Communication Systems ◽  
Block Code ◽  
Wireless Communication Systems ◽  
Time Block ◽  
Coding Gain ◽  
Transmission Scheme ◽  
Encoding Scheme ◽  
Space Time Block Code ◽  
Alamouti Code ◽  
Diversity Scheme

We present a new transmit strategy based on modified Alamouti codes for the simple two branch transmit diversity scheme. The OFDM payload cells from the output of the frequency interleaver is done on one transmit antenna, and the encoding is proceeded on another branch. The proposed encoding scheme can significantly simplify the processes of transforming SISO into MIMO in wireless communication systems. The scheme may easily be generalized to two transmit antennas and M receive antennas to provide a diversity order of 2M, its coding gain is similar to Alamouti code. Computer simulations are performed to investigate the performance of the proposed parallel STBC scheme in a multi-input (MI) system.

Space-Time Coding Technique Based on Four-Antenna Transceiver System

2011 ◽  
Vol 135-136 ◽  
pp. 913-917
Author(s):  
Yan Chu ◽  
Chun Hua Deng ◽  
Yan Shao ◽  
Hai Guang Wang
Keyword(s):  
Communication Systems ◽  
Transmission Rate ◽  
Block Code ◽  
Space Time ◽  
Space Time Coding ◽  
Time Diversity ◽  
Rate Transmission ◽  
Full Rate ◽  
Self Adaptation ◽  
Time Coding

Space-time block code, as one of the space-time codes, greatly improves the performance in the cooperative wireless communication systems by the use of space and time diversity. However, traditional STBC can’t enhance the overall transmission rate and there is no form of complex codes with the rate of 1 when the number of antenna is more than 2. In order to design codes with full-rate, we refer to quasi-orthogonal STBC whose generator matrix is orthogonal between its subspaces. In this paper, based on the combination of QO-STBC and Self-adaptation technology, we propose a new plan of space-time coding which dismisses the interference among symbols when decoding and advances the coding capabilities in the context of full-rate transmission, finally we justify the new plan through lots of computational simulations.

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