Research Article

Performance Analysis of Grouped Multilevel Space-Time Trellis Coding Technique Using Cognitive Radio in Different Deployment Models

Algorithm 2

Trellis coding.
Step 1: input parameters
n, k, L, number of symbols, M, N, S, bits per symbol
Step 2: generation of trellis code polynomial
Calculate the number of constellation points using the number of bits per symbol
Store the value of the symbol that needs to be transmitted in N
Define the generator polynomial
Initialize the Codeword, Next state, and previous state matrices
Apply the random interleaver for removing the burst errors
Step 3: apply modulation of the Type-64 QAM
Step 4: defining the simulation parameters
Total energy of the codeword,
Calculate the number of information bits = number of symbols
Calculate the number of coded bits = number of symbols
While ()
Step 5: initialize the counters to store
Number of errors = error counts
Number of frame = frame count
Number of bits = bit count
Step 6: calculate SNR
While (error counts < 1000 and frame count ≤ 100)
Step 7: compute energy per bit
Step 8: compute noise variance
Step 9: apply the input bits
Input bits = round (rand (1, ))
Step 10: convert number of bits to symbols
Symbols = bits to the symbol (n, number of symbols, input bits)
Step 11: apply convolution encoding
Generate the transmitted signal
Step 12: calculate the received signal
Step 13: apply the demodulation
Step 14: apply decoding
End
Step 15: calculate bit error rate
End