Examination of the multiple-input multiple-output space-time block-code selective decode and forward relaying protocol over non-homogeneous fading channel conditions

2021 ◽  
pp. 154851292110475
Author(s):  
Ravi Shankar ◽  
Patteti Krishna ◽  
Naraiah R
Keyword(s):  
Fading Channel ◽  
Multiple Input Multiple Output ◽  
Block Code ◽  
Channel Fading ◽  
Time Block ◽  
Decode And Forward ◽  
Space Time Block Code ◽  
Multiple Input ◽  
Channel Conditions ◽  
Input Multiple Output

With the tremendous increase in wireless user traffic, investigation on the end-to-end reliability of wireless networks in practical conditions such as non-homogeneous fading channel conditions is becoming increasingly widespread. Because they fit well to the experimental data, generalized channel fading distributions like κ–μ are well suited for modeling diverse fading channels. This paper analyzes the symbol error rate (SER) and outage probability (OP) performance of multiple-input multiple-output (MIMO) space-time block-code (STBC) selective decode and forward (S-DF) network over κ–μ fading channel conditions considering the additive white Gaussian noise (AWGN). First, the closed-form (CF) analytical expressions for the probability density function (PDF) and the cumulative distribution function (CDF) of the received signal-to-noise ratio (SNR) as well as its moment generating function (MGF) are derived. Second, the OP performance is then investigated for various values of the channel fading parameter and SNR regimes. The simulation findings show an increase in SER performance with an improved line-of-sight (LOS) component. Furthermore, the results show that the S-DF relaying systems can function properly even when there is no fading or LOS component. The OP has been increasing with the increase in the value of μ and κ. In medium and high SNR regimes, simulation results exactly match with analytical results.

Pilots Updating Channel Compensation Base on Underwater MIMO-OFDM

2012 ◽  
Vol 198-199 ◽  
pp. 1761-1767 ◽  
Author(s):  
Zong Xin Sun ◽  
Wei Wang ◽  
Yue Wang ◽  
Rehan Khan ◽  
Gang Qiao
Keyword(s):  
Spectral Efficiency ◽  
Hot Spot ◽  
Multiple Input Multiple Output ◽  
Block Code ◽  
Time Block ◽  
Improved Method ◽  
Space Time Block Code ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Mimo Ofdm

The communication rate is limited extremely by the confined bandwidth source of UWA (underwater acoustic) channel. MIMO (Multiple-input Multiple-output) techniques can drastically improve the spectral efficiency, and have been a new hot spot in UWA commutation. To estimate the UWA channel STBC (space-time block code) technique is adopted, and the improved method of channel estimating is also given. A designed of complex coding MIMO-OFDM is provided.The validity and the dependability of the scheme are verified by Monte Carlo simulations.

scholarly journals A Janus compatible software-defined underwater acoustic multiple-input multiple-output modem

2021 ◽  
Vol 17 (4) ◽  
pp. 155014772110106
Author(s):  
Surinder Singh ◽  
Mark Crispo ◽  
Jean-François Bousquet ◽  
Shadi Aljendi
Keyword(s):  
Transmission Rate ◽  
Multiple Input Multiple Output ◽  
Block Code ◽  
Continuous Phase ◽  
Space Time ◽  
Transmission Mode ◽  
Time Block ◽  
Space Time Block Code ◽  
Multiple Input ◽  
Input Multiple Output

This article describes the implementation of a multiple-input multiple-output acoustic communication link in shallow water conditions to enable a software-defined acoustic modem with a maximum transmission rate of 20 kbps in a 5-kHz bandwidth. The reliability improvement of a low-complexity Alamouti space–time block code is evaluated to improve the diversity in a high-rate transmission mode using single carrier modulation, as well as in a low-rate transmission mode relying on continuous-phase frequency-shift keying. Using measurements in realistic subsea conditions, the effect of the spatial channel correlation is demonstrated. It is found that for the space–time block code/continuous-phase frequency-shift keying, the spatial diversity is significantly degraded due to the high spatial correlation. In contrast, for the high-mode transmission rate, space–time block code with single carrier modulation offers a bit error rate improvement by a factor over hundred, in comparison to a single transmit element, demonstrating that the multiple-input multiple-output optimal code depends on the software-defined acoustic modem transmission mode.

scholarly journals Turbo-Space Time Block Coded and Turbo-Vertical Bell Laboratories Layered Space Time coded Wireless Communication: Which One is better to Use and under What Circumstances?

2019 ◽  
Vol 8 (2) ◽  
pp. 3912-3919
Keyword(s):  
Wireless Communication ◽  
Research Performance ◽  
Multiple Input Multiple Output ◽  
Block Code ◽  
Space Time ◽  
Time Block ◽  
Low Snr ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Turbo Encoder

In this research, performance of Turbo-Space Time Block Coded and Turbo-Vertical Bell Laboratories Layered Space Time coded Multiple Input Multiple Output Wireless Communication System is compared and investigated to find which one is better under which circumstances. The Turbo Encoder accepts binary bits as input and generates turbo encoded bits as output which is sent to 64 QAM modulator. These 64 QAM Modulated symbols are further mapped using Space Time Block Code and Vertical Bell Laboratories Layered Space Time code for Turbo-Space Time Block Coded system and Turbo-Vertical Bell Laboratories Layered Space Time coded system respectively and then divided into several streams based on number of transmit antennas before transmission. It is found that there is 3 to 22 dB coding gain at 10-5 for using Turbo-STBC instead of using Turbo-VBLAST for 2 or 3 or 4 transmit antennas and 2 or 3 or 4 or 5 or 6 receive antennas. On the other hand, at low SNR STBC shows 1-2 b/s/Hz improvement in capacity compare to VBLAST but capacity declines significantly at high SNR for using STBC. It is also observed that VBLAST improves the capacity around 5 to 15 b/s/Hz at high SNR.

Circlar Decoding and Sparse Channel Estimation for Underwater MIMO-OFDM

2012 ◽  
Vol 198-199 ◽  
pp. 1748-1754
Author(s):  
Wei Wang ◽  
Gang Qiao ◽  
Rehan Khan ◽  
Yue Wang ◽  
Song Zuo Liu
Keyword(s):  
Multiple Input Multiple Output ◽  
Block Code ◽  
Underwater Acoustic Communications ◽  
Compress Sensing ◽  
Time Block ◽  
Sparse Channel Estimation ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Mimo Ofdm ◽  
Sparse Channel

In UWA (underwater acoustic) communications, data rate is severely limited by the confined bandwidth source of aquatic channel. MIMO (Multiple-input Multiple-output) techniques can drastically improve the spectral efficiency, and have been a new point of reference in UWA commutations. For the estimation of UWA channel which is usually sparse, CS (compress sensing) along with STBC (space-time block code) is adopted with improved results. A design of mixing coding MIMO-OFDM is also presented in the proposed method. The validity and the dependability of this scheme are verified by Monte Carlo simulations.

scholarly journals Experimental Evaluation of MIMO-OFDM System with Rateless Space-Time Block Code

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Ali H. Alqahtani ◽  
Khaled Humadi ◽  
Ahmed Iyanda Sulyman ◽  
Abdulhameed Alsanie
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Multiple Input Multiple Output ◽  
Block Code ◽  
Space Time ◽  
Ofdm System ◽  
Time Block ◽  
Space Time Block Code ◽  
Field Programmable ◽  
Input Multiple Output ◽  
Mimo Ofdm

Multiple-input multiple-output (MIMO) wireless technology in combination with orthogonal frequency-division multiplexing (MIMO-OFDM) is an attractive technique for next-generation wireless systems. However, the performance of wireless links is severely degraded due to various channel impairments which cause a decoding failure and lead to packet loss at the receiver. One technique to cope with this problem is the rateless space-time block code (RSTBC). This paper presents experimental results on the performance of a 2×2 MIMO-OFDM system with RSTBC as measured in a testbed implemented with field-programmable gate array (FPGA). The average bit error rate (BER) performance of the proposed scheme is evaluated experimentally, and the results agree closely with simulation and analytical upper bound. It has been shown that RSTBC can be implemented in real-world scenarios and guarantee the reliability of loss-prone wireless channels.

scholarly journals Space-Time Block Coded Cooperative MIMO Systems

Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 109
Author(s):  
Han Hai ◽  
Caiyan Li ◽  
Jun Li ◽  
Yuyang Peng ◽  
Jia Hou ◽  
...  
Keyword(s):  
Mimo Systems ◽  
Multiple Input Multiple Output ◽  
Block Code ◽  
Spatial Diversity ◽  
Space Time ◽  
Time Block ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Significant Performance ◽  
Save Energy

The main objective of a Cooperative Multiple-Input Multiple-Output (CMIMO) system is to improve network throughput and network coverage and save energy. By grouping wireless devices as virtual multi-antenna nodes, it can thus simulate the functions of multi-antenna systems. A Space-Time Block Code (STBC) was proposed to utilize the spatial diversity of MIMO systems to improve the diversity gain and coding gain. In this paper, we proposed a cooperative strategy based on STBC and CMIMO, which is referred to as Space-Time Block Coded Cooperative Multiple-Input Multiple-Output (STBC-CMIMO) to inherit the advantages from both STBC and CMIMO. The theoretical performance analysis for the proposed STBC-CMIMO is presented. The performance advantages of the STBC-CMIMO are also shown by simulations. In the simulations, it is demonstrated that STBC-CMIMO can obtain significant performance compared with the existing CMIMO system.

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