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zeeglen
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bits and Bytes and Megas and millis
zeeglen   4/22/2014 9:55:29 AM
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...efficient modulation schemes allow us to carry more MBits/mHz through the air.

Sounds like a nice device, but here is a Bit of nitpick:

Convention is that Bytes is uppercase B, bits is lower case b.  Mega is uppercase M,  milli is lowercase m, data rate is per second s.

So rate should read Mb/s/MHz; unless of course a truly amazing breakthrough allows us to squeeze Mbits/second into millihertz of bandwidth.  Yes, Mbits can be sent in mHz, but takes an awful long time.

Nice to see Hz and dBm uppercase in honour of the genius scientists that figured these out way back when. Have seen some uses of db by those unaware of the reason.

rbv
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Re: bits and Bytes and Megas and millis
rbv   4/22/2014 5:53:01 PM
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But then you can cancel the prefixes, to get bps/Hz.  After that, multiply the seconds and Hertz in the denominator.  And discover that the quantity actually being sought is (bits/symbol).  But according to Shannon, that really means optimization of SNR.



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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