File:Softhard.png
| Uploaded by | Kirlf |
|---|---|
| Upload date | 2019-02-06T05:07:59Z |
| MIME type | image/png |
| Dimensions | 561 × 420 px |
| File size | 7.6 KB |
Summary
| 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')
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| Date | |||
| Source | Own work | ||
| Author | Kirlf | ||
| Other versions |
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