File:Softhard.png

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Softhard.png ‎(561 × 420 pixels, file size: 8 KB, MIME type: image/png)

Captions

Captions

Comparison of QPSK with and without convolutional codes (7, [175 133]) (AWGN).

Summary[edit]

Description
English: Theoretical bit-error rate curves for uncoded and coded QPSK, additive white Gaussian noise channel. Hard decision means that the decoder expects binary symbols (0's and 1's); Soft decision means that the decoder expects log-likelihood ratios[1][2].

MATLAB script: 

clear all 
close all 
clc 

EbNo = 0:7; 
spect = distspec(poly2trellis(7,[171 133]),7) 
ber_h = bercoding(EbNo,'conv','hard',1/2,spect); 
ber_s = bercoding(EbNo,'conv','soft',1/2,spect); 
ber_u = berawgn(EbNo,'psk',4,'nondiff'); 

figure(1) 
semilogy(EbNo, ber_h, EbNo, ber_s,... 
EbNo, ber_u, 'LineWidth', 1.5) 
hold on 
legend('Hard','Soft','Uncoded','location','best') 
grid on 
xlabel('Eb/No (dB)') 
ylabel('Bit Error Rate')
Date
Source Own work
Author Kirlf
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Licensing[edit]

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  1. ↑ LLR vs. Hard Decision Demodulation
  2. ↑ Estimate BER for Hard and Soft Decision Viterbi Decoding

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Date/TimeThumbnailDimensionsUserComment
current05:07, 6 February 2019Thumbnail for version as of 05:07, 6 February 2019561 × 420 (8 KB)Kirlf (talk | contribs)User created page with UploadWizard

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