Improved upper bound on bit error rate for truncated convolutional codes

1998 ◽  
Vol 34 (1) ◽  
pp. 65 ◽  
Author(s):  
Hichan Moon
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Upper Bound ◽  
Convolutional Codes

Rate-Compatible Punctured Ring Convolutional Coded Continuous Phase Modulation

2012 ◽  
Vol 195-196 ◽  
pp. 217-220
Author(s):  
Lei Zhang ◽  
Man Ping Tong ◽  
Hong Bo Wang
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Phase Modulation ◽  
Euclidean Distance ◽  
Convolutional Codes ◽  
Continuous Phase ◽  
Transmission Efficiency ◽  
Continuous Phase Modulation ◽  
Simulation Results ◽  
Squared Euclidean Distance

In this paper, continuous phase modulation (CPM) with rate-compatible punctured ring convolutional codes is investigated. Some typical schemes with maximum normalized minimum squared euclidean distance (NMSED) are searched and given. The performance of bit error rate for rate-compatible punctured ring convolutional coded CPM on AWGN channel is simulated, and simulation results show that this system can provide good performance of bit error rate and variable-rate capabilities. Furthermore, simulation results also prove that the transmission efficiency increases when code rate is decreasing.

scholarly journals Constraint length inflation in fixed high rate convolutional codes and their impact on performance of O-IDMA

2020 ◽  
Vol 20 (2) ◽  
pp. 837
Author(s):  
Ravi Prakash ◽  
Ajay Kumar Maurya ◽  
Rakesh Kumar Maurya ◽  
B. B. Tiwari
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Technology Use ◽  
Communication Systems ◽  
Multiple Access ◽  
Convolutional Codes ◽  
Combined Effect ◽  
High Rate ◽  
Access Technology ◽  
Constraint Length

<p>To cope up with the higher data rate existing in modern communication systems multiple access technologies has been investigated OIDMA (Optical Interleave Division Multiple Access Technology) is one of the prominent technology use to fulfill this demand. Convolutional codes used in OIDMA systems enhance the performances and reduces the bit error rate of the system. In the present paper, the convolutional codes with increasing number of memory elements are used, the constraint length which depends on number of memory elements are increased with a systematic manner and their combined effect on response of OIDMA system has been observed. Tree inter-leavers in taken into account for analysis purpose and BER with increasing number of users is plotted in graphical and tabular manner.</p>

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