scholarly journals Asynchronous Two-Way Relaying Networks Using Distributed Differential Space-Time Coding

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Minjie Qian ◽  
Yanliang Jin ◽  
Zhuo Wu ◽  
Tao Wang
Keyword(s):  
Signal Detection ◽  
System Performance ◽  
Space Time ◽  
Channel State ◽  
Detection Scheme ◽  
State Information ◽  
Space Time Coding ◽  
Time Coding ◽  
Simulation Results ◽  
Synchronization Effect

A signal detection scheme is proposed for two-way relaying network (TWRN) using distributed differential space-time coding (DDSTC) under imperfect synchronization. Unlike most of existing work, which assumed perfect synchronization and channel state information (CSI) at all nodes, a more realistic scenario is investigated here by considering the signals transmitted from the two source nodes arriving at the relay not exactly at the same time due to the distributed nature of the nodes, and no CSI is available at any node. The proposed signal detection scheme is then demonstrated to remove the imperfect synchronization effect significantly through simulation results. Furthermore, pairwise error probability (PEP) of the asynchronous TWRN is analyzed and derived for both source nodes. Based on the simplified PEP expression, an optimum power allocation (OPA) scheme is then determined to further improve the whole system performance, when neither the source nor the relay has any knowledge of the CSI.

Layered Space-Time Multi-User Detection Based on Kalman Filter

2012 ◽  
Vol 220-223 ◽  
pp. 2012-2016
Author(s):  
Ling Ling Yang ◽  
Hong Xiang Shao ◽  
Yong Sheng Hu ◽  
Chao Guo
Keyword(s):  
Mathematical Model ◽  
Kalman Filter ◽  
Bit Error Rate ◽  
Detection Algorithm ◽  
Space Time ◽  
Cdma System ◽  
Space Time Coding ◽  
Channel Tracking ◽  
Time Coding ◽  
Simulation Results

This paper represents the theories of mathematical model of DS-CDMA system, principle of Kalman filter and layered space-time coding. Then, for the purpose of overcoming the disadvantages of traditional multi-user detection algorithm, the paper proposes the layered space-time multi-user detection algorithm based on kalman filter. Simulation results show the effectiveness of the proposed algorithm, such as the convergence speed is quickened, bit error rate is reduced greatly and channel tracking capability is improved significantly.

Space-Time Coding for Aeronautical Telemetry: Part II—Decoder and System Performance

2017 ◽  
Vol 53 (4) ◽  
pp. 1732-1754 ◽  
Author(s):  
Michael Rice ◽  
Tom Nelson ◽  
Joseph Palmer ◽  
Christopher Lavin ◽  
Kip Temple
Keyword(s):  
System Performance ◽  
Space Time ◽  
Space Time Coding ◽  
Time Coding

Simulation and Application of Space-Time Coding in OFDM System in Coal Mines

2014 ◽  
Vol 989-994 ◽  
pp. 3902-3905
Author(s):  
Jing Xin Wei ◽  
Chun Sun
Keyword(s):  
Communication System ◽  
System Performance ◽  
Coal Mines ◽  
Low Complexity ◽  
Space Time ◽  
Ofdm System ◽  
Space Time Coding ◽  
Structure Diagram ◽  
Time Coding ◽  
Ber Performance

This research is conducted with the objective of improving the OFDM system in coal mines with regard to its defects and puts forward a structure diagram of STBC-OFDM transceiver for systems which require low complexity with a simulation of the system performance. Through the simulation, in which the STBC-OFDM communication system in coal mines is employed, the BER performance of the OFDM system is improved and the complexity and cost of the receiver is lowered with a significant reduction in daily maintenance.

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