Relationships between Diversity Techniques and Channel Coding Rates for OFDM Systems

2010 ◽  
Vol E93-B (1) ◽  
pp. 195-197 ◽  
Author(s):  
Minjoong RIM
Keyword(s):  
Channel Coding ◽  
Ofdm Systems ◽  
Diversity Techniques

scholarly journals Design and Analysis of MIMO F-OFDM Systems for 5G and Beyond Wireless Communications

2021 ◽  
Vol 10 (2) ◽  
pp. 203-210
Author(s):  
Sohag Sarker ◽  
◽  
Laila Arzuman Ara ◽  
Tahsin Alam ◽  
Tarun Debnath ◽  
...  
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Channel Coding ◽  
Spectrum Efficiency ◽  
Fir Filters ◽  
Rate Performance ◽  
Ofdm Systems ◽  
Spectrum Utilization ◽  
Modulation Techniques ◽  
Simulation Results

F-OFDM (Filtered-OFDM) is a flexible waveform that has been considered suitable for 5G and beyond systems for its improved spectrum utilization, moderates PAPR, low OOB emission, multiple asynchronous sub-band transmission, and high robustness to frequency selectivity. It can attain a desirable balance between frequency and time localizations for narrow bandwidths. It is also MIMO friendly. In this paper, a comprehensive design and analysis have been made to evaluate the performance of MIMO (4×4) CP-OFDM and F-OFDM systems for message bits transmission using several digital modulation techniques (16-QAM, 16-PSK, 16-DPSK, 64-QAM, 64-PSK, and 64-DPSK), RA channel coding, different windowed (Hanning, Hamming, Blackman, Blackman-Harris, RRC) sinc FIR filters for length N = 513, and MMSE signal detection technique. From MATLAB based simulation results, it is observed that F-OFDM reduces spectrum leakage thus enhances spectrum efficiency than conventional CP-OFDM. F-OFDM based system offers lower BER (Bit Error Rate) performance than CP-OFDM based system.

scholarly journals Performance improvement of 4G OFDM systems using CTSTC techniques

2018 ◽  
Vol 7 (2.21) ◽  
pp. 131
Author(s):  
C Padmaja ◽  
B L. Malleswari
Keyword(s):  
Channel Coding ◽  
Communication Systems ◽  
Performance Enhancement ◽  
Space Time ◽  
Ofdm Systems ◽  
Coding Gain ◽  
Space Time Coding ◽  
Rate Transmission ◽  
Time Encoding ◽  
Data Rate Transmission

The concatenation of channel coding and diversity schemes are essential in the 4G communication systems to improve the reliable data rate transmission. To address Bit Error Rate performance enhancement, the paper presents the coding gain and diversity gain benefits using the proposed CTSTC scheme by adding modified Turbo features and Space Time encoding features. Simulation results of are provided using MATLAB and compared the results with convolutional coded Space Time Coding technique.  

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