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.

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.

PERFORMANCE ANALYSIS OF MULTICARRIER CDMA SYSTEM BASED ON COMPLEX WAVELET PACKET AND SPACE–TIME BLOCK CODES IN RAYLEIGH FADING CHANNEL

2006 ◽  
Vol 15 (01) ◽  
pp. 57-74 ◽  
Author(s):  
XIANGBIN YU ◽  
XIAODONG ZHANG ◽  
GUANGGUO BI
Keyword(s):  
Fading Channel ◽  
Wavelet Packet ◽  
Block Codes ◽  
Space Time ◽  
Cdma System ◽  
Time Block ◽  
Space Time Coding ◽  
Space Time Block Codes ◽  
Time Coding ◽  
Complex Wavelet

On the basis of analyzing the principle of multicarrier CDMA (MC-CDMA) technique and space–time coding technique, using the optimized complex wavelet packet as multicarrier modulation, a novel MC-CDMA system based on complex wavelet packet and space–time block codes is proposed. The bit error rate (BER) performance of the system is investigated in Rayleigh fading channel, and the corresponding BER expression is derived in detail. The system can overcome the decrease of spectrum efficiency of conventional MC-CDMA due to inserting cyclic prefix (CP). Moreover, the application of space–time coding technique strengthens the capability against fading channel significantly and perfects the system performance. Theoretical analysis shows that the proposed system with 2-transmitter antenna and 2-receiver antenna space–time block codes performs four times better than the single-antenna MC-CDMA system based on complex wavelet packet (CWP-MC-CDMA); the same conclusion is also reached by the simulation results in fading channel. As a result, the performance of the proposed CWP-MC-CDMA system outperforms a conventional MC-CDMA system based on DFT, it is close or superior to that of the conventional MC-CDMA with CP. Especially, the CWP-MC-CDMA system with space–time coding has superior ability to combat spatial fading and multi-access interference, and it slightly outperforms conventional MC-CDMA with CP and space–time coding.

Transmit beampattern synthesis for chirp space-time coding array by time delay design

2020 ◽  
pp. 102901
Author(s):  
Huake Wang ◽  
Guisheng Liao ◽  
Yuhong Zhang ◽  
Jingwei Xu ◽  
Shengqi Zhu ◽  
...  
Keyword(s):  
Time Delay ◽  
Space Time ◽  
Space Time Coding ◽  
Time Coding ◽  
Beampattern Synthesis
Sign in / Sign up

Export Citation Format

Share Document