studentspace:labs
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studentspace:labs [2007/10/29 22:40] – removed cs233066 | studentspace:labs [2007/11/06 05:24] (current) – cs233257 | ||
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+ | Hi Everyone! | ||
+ | I have a question about Lab 2. When it asks for the symbol error, what does it mean? I think that for 16-QAPSK, each " | ||
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+ | But there is another way to think about it where we can consider the output of the r and s matched filters as one symbol. So if you send one bit and erroneously get a 0 on the r matched filter but get a correct value for the s matched filter, the symbol error would be 100% but the bit error would be 50%. Any thoughts? | ||
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+ | Thanks! | ||
+ | Hassan | ||
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+ | =============================================================== | ||
+ | Hi Hassan, | ||
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+ | The definition of a symbol is what you can transmit through the channel at a given instance... In both cases in our lab our Baud rate is 1 symbol/ | ||
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+ | Example: | ||
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+ | Source data: | ||
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+ | 1 0 1 0 0 0 1 1 1 0 1 0 0 1 0 1 | ||
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+ | 1 0 1 0 1 0 1 1 1 1 1 0 1 1 0 1 | ||
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+ | Where the error rate is 3/16 errors per bit | ||
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+ | Now in the first case each symbol is two consecutive bits: | ||
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+ | The error rate is 3/8 errors per symbol. | ||
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+ | Now in our second case each symbol is four consecutive bits: | ||
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+ | The error rate is 3/4 errors per symbol. | ||
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+ | Hope it helps, and hope someone will correct me if I am wrong :) | ||
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+ | Regards, | ||
+ | |||
+ | Ron | ||
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+ | ================================================================= |
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