scholarly journals System Level Evaluation of Innovative Coded MIMO-OFDM Systems for Broadcasting Digital TV

2008 ◽  
Vol 2008 ◽  
pp. 1-12 ◽  
Author(s):  
Y. Nasser ◽  
J.-F. Hélard ◽  
M. Crussière
Keyword(s):  
Mimo Systems ◽  
Layer Structure ◽  
Practical Interest ◽  
Block Code ◽  
Digital Tv ◽  
Space Time ◽  
System Level ◽  
Single Frequency ◽  
Ofdm Systems ◽  
Time Space

Single-frequency networks (SFNs) for broadcasting digital TV is a topic of theoretical and practical interest for future broadcasting systems. Although progress has been made in the characterization of its description, there are still considerable gaps in its deployment with MIMO technique. The contribution of this paper is multifold. First, we investigate the possibility of applying a space-time (ST) encoder between the antennas of two sites in SFN. Then, we introduce a 3D space-time-space block code for future terrestrial digital TV in SFN architecture. The proposed 3D code is based on a double-layer structure designed for intercell and intracell space time-coded transmissions. Eventually, we propose to adapt a technique called effective exponential signal-to-noise ratio (SNR) mapping (EESM) to predict the bit error rate (BER) at the output of the channel decoder in the MIMO systems. The EESM technique as well as the simulations results will be used to doubly check the efficiency of our 3D code. This efficiency is obtained for equal and unequal received powers whatever is the location of the receiver by adequately combining ST codes. The 3D code is then a very promising candidate for SFN architecture with MIMO transmission.

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

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