scholarly journals Improved Iterative Decoding of Network-Channel Codes for Multiple-Access Relay Channel

2015 ◽  
Vol 2015 ◽  
pp. 1-10
Author(s):  
Saikat Majumder ◽  
Shrish Verma
Keyword(s):  
Network Coding ◽  
Cooperative Communication ◽  
Convolutional Code ◽  
Effective Means ◽  
Error Correcting Code ◽  
Base Station ◽  
Space Diversity ◽  
Relay Channel ◽  
Soft Decoding ◽  
Network Channel

Cooperative communication using relay nodes is one of the most effective means of exploiting space diversity for low cost nodes in wireless network. In cooperative communication, users, besides communicating their own information, also relay the information of other users. In this paper we investigate a scheme where cooperation is achieved using a common relay node which performs network coding to provide space diversity for two information nodes transmitting to a base station. We propose a scheme which uses Reed-Solomon error correcting code for encoding the information bit at the user nodes and convolutional code as network code, instead of XOR based network coding. Based on this encoder, we propose iterative soft decoding of joint network-channel code by treating it as a concatenated Reed-Solomon convolutional code. Simulation results show significant improvement in performance compared to existing scheme based on compound codes.

scholarly journals Cooperative Admission Control with Network Coding in 5G Underlying D2D-Satellite Communication

Electronics ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 1601
Author(s):  
Asfandyar Awan ◽  
Zhao Qi ◽  
Shan Hu ◽  
Lijiang Chen
Keyword(s):  
Power Allocation ◽  
Network Coding ◽  
Admission Control ◽  
Cooperative Communication ◽  
Power Efficiency ◽  
Satellite Communication ◽  
Base Station ◽  
User Selection ◽  
Complex Solution ◽  
Mode Assignment

Cooperative communication supported by device to device (D2D)-LEO earthed satellite increases the performance of the resilient network and offloads base station. Additionally, network coding in a packet-based cooperative framework provides diversity and speedy recovery of lost packets. Cooperative communication advantages are subject to effective joint admission control strengthened by network coding for multiple interfaces. Joint admission control with network coding involves multiple constraints in terms of user selection, mode assignment, power allocation, and interface-based network codewords, which is challenging to solve collectively. Sub-problematization and its heuristic solution lead to a less complex solution. First, the adaptive terrestrial satellite power sentient network (ATSPSN) algorithm is proposed based on low complex convex linearization of mix integer non-linear problem (MINLP), NP-hard. ATSPSN provides optimum power allocation, mode assignment, and user selection based on joint channel conditions. Second, a multiple access network coding algorithm (MANC) is developed underlying the D2D-satellite network, which provides novel multiple interface random linear network codewords. At the end, the bi-directional matching algorithm aiming for joint admission control with network coding, named JAMANC-stream and JAMANC-batch communication, is proposed. JAMANC algorithm leads to a less complex solution and provides improved results in terms of capacity, power efficiency, and packet completion time. The theoretical lower and upper bounds are also derived for comparative study.

scholarly journals MmWave V2X Cooperative Diversity Relay Channel with Feedback Delay and Link Blockage

2021 ◽  
Author(s):  
Elyes Balti
Keyword(s):  
Cooperative Diversity ◽  
Signal To Noise Ratio ◽  
Base Station ◽  
Maximal Ratio Combining ◽  
High Signal ◽  
Relay Channel ◽  
Framework Analysis ◽  
Decode And Forward ◽  
Multiple Transmit ◽  
To Receive

In this work, we present a framework analysis of a millimeter wave (mmWave) vehicular communications systems. Communications between vehicles take place through a cooperative relay which acts as an intermediary base station (BS). The relay is equipped with multiple transmit and receive antennas and it employs decode-and-forward (DF) to process the signal. Also, the relay applies maximal ratio combining (MRC), and maximal ratio transmission (MRT), respectively, to receive and forward the signal.As the vehicles' speeds are relative high, the channel experiences a fast fading and this time variation is modeled following the Jake's autocorrelation model. We also assume narrowband fading channel. Closed-form expressions of the reliability metrics such as the outage probability and the mean rate are derived. Capitalizing on these performances, we derive the high signal-to-noise-ratio (SNR) asymptotes to get full insights into the system gains such as the diversity and coding gains.

Research on Network Coding Based on Convolutional Codes

2013 ◽  
Vol 694-697 ◽  
pp. 2270-2273
Author(s):  
Hai Ping Liu ◽  
Shi Bin Su
Keyword(s):  
Outage Probability ◽  
Network Coding ◽  
Convolutional Code ◽  
Convolutional Codes ◽  
Probability Analysis ◽  
System Model ◽  
Code Scheme ◽  
Cooperation Network

For the system with two sources, three relays and one destination, cooperation network convolutional code scheme is presented to solve the relay sharing problem. The scheme searches out convolutional code corresponding to system model, and then decides relay coding structure. Outage Probability analysis and BER simulation show that 3-order diversity is achieved.

scholarly journals Selective physical layer network coding in bidirectional relay channel

2017 ◽  
Vol 11 (18) ◽  
pp. 2691-2701 ◽  
Author(s):  
Ala Mahdavi ◽  
Ali Jamshidi ◽  
Alireza Keshavarz-Haddad
Keyword(s):  
Network Coding ◽  
Physical Layer ◽  
Relay Channel ◽  
Physical Layer Network Coding
Sign in / Sign up

Export Citation Format

Share Document