ABSTRACT
This research focuses on modeling
of convolutional encoder with Viterbi decoder for next generation broadband
wireless access systems. A stipulated rate-compactible punctured convolutional
codes from the usual mother rate 1/2, constraint length K = 7 and generator
used in the Simulation of the model which was carried out over an Additive
.White Gaussian Noise (AWGN) channel using the Binary Phase Shift Keying (BPSK)
modulation technique. When soft decision coding with Configurable Rates of !6
and 2/3, input random sequence of 1 million bits for a range of 0 - 14dB was
simulated. It was observed that BER for each quantization width decreased
exponentially with the increase in SNR. The coding gain of each of them at 0.14
BER showed some slight differences with the 4-bit quantization, though not I?
it was seen that an increase in the coding rate of £k/n’ resulted in a decrease
in SNR gain ofboth. Also soft decision coding with width of 2 tends to have a
better coding gain as compared to soft Viterbi decoder to decode the normal 1/n
code rate with K constraint length, a trace-back comparison is made with a
Viterbi decoder with an infinite memory. xiii decision coding with width of 3.
These established benefits both the increase in SNR (Eb/No) and coding rates.
Also, observations have proved that in using length of ‘Kx5’ or ‘Kx6’ will be
fully enough for the Viterbi decoder to comfortably handle the received data
symbol decoding without any noticeable performance degradation as against when
width. Comparing soft decision coding with width of 2 and soft decision coding
with width of 3, polynomial 1171. 133] was employed to obtain higher rate of
2/3.
BROWN, J (2023). Modeling of convolutional encoder with viterbi decoder fornext generation broadband wireless access systems:- Okonba, Brown J.. Mouau.afribary.org: Retrieved Nov 23, 2024, from https://repository.mouau.edu.ng/work/view/modeling-of-convolutional-encoder-with-viterbi-decoder-fornext-generation-broadband-wireless-access-systems-okonba-brown-j-7-2
J., BROWN. "Modeling of convolutional encoder with viterbi decoder fornext generation broadband wireless access systems:- Okonba, Brown J." Mouau.afribary.org. Mouau.afribary.org, 29 Nov. 2023, https://repository.mouau.edu.ng/work/view/modeling-of-convolutional-encoder-with-viterbi-decoder-fornext-generation-broadband-wireless-access-systems-okonba-brown-j-7-2. Accessed 23 Nov. 2024.
J., BROWN. "Modeling of convolutional encoder with viterbi decoder fornext generation broadband wireless access systems:- Okonba, Brown J.". Mouau.afribary.org, Mouau.afribary.org, 29 Nov. 2023. Web. 23 Nov. 2024. < https://repository.mouau.edu.ng/work/view/modeling-of-convolutional-encoder-with-viterbi-decoder-fornext-generation-broadband-wireless-access-systems-okonba-brown-j-7-2 >.
J., BROWN. "Modeling of convolutional encoder with viterbi decoder fornext generation broadband wireless access systems:- Okonba, Brown J." Mouau.afribary.org (2023). Accessed 23 Nov. 2024. https://repository.mouau.edu.ng/work/view/modeling-of-convolutional-encoder-with-viterbi-decoder-fornext-generation-broadband-wireless-access-systems-okonba-brown-j-7-2