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OfficeSpace
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re: 16QAM/QPSK Communication Systems Design
OfficeSpace   2/27/2011 3:03:21 AM
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Thanks Frank, you just did the kids homeWork. These young-guns need to stay w/the discretes, fully understood. What isn't in an IC package at this date in one form/purpose/function or another.

gagikk
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re: 16QAM/QPSK Communication Systems Design
gagikk   2/15/2011 11:32:29 AM
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I'm only doing a project with them. I thought it may be useful.

old account Frank Eory
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re: 16QAM/QPSK Communication Systems Design
old account Frank Eory   2/11/2011 6:02:01 PM
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Nice to see there IS somebody making modulator & demodulator building block ICs. Thanks for posting the link to your company's website.

gagikk
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re: 16QAM/QPSK Communication Systems Design
gagikk   2/10/2011 1:33:11 PM
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have a look on CMX1763, CMX998. www.cmlmicro.com

old account Frank Eory
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re: 16QAM/QPSK Communication Systems Design
old account Frank Eory   2/7/2011 8:26:16 PM
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Bao, the functions you mentioned -- symbol mapper, etc. -- are usually integrated in a single IC, not sold as separate components. Most of the modem functions can be implemented digitally on an FPGA, or better yet, one FPGA for the transmitter and another one for the receiver. If you focus on the system design & digital implementation, you should discover that the only other components you need besides the FPGAs are A/D and D/A converters and amplifers.

t.alex
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re: 16QAM/QPSK Communication Systems Design
t.alex   2/7/2011 9:00:04 AM
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I think maybe start with overall diagram concept then break down into components.

eewiz
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re: 16QAM/QPSK Communication Systems Design
eewiz   2/6/2011 4:21:22 PM
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Homework? Anyway check the below sites. It might help. http://www.newark.com/ http://www.digikey.com/ http://www.mouser.com/ http://www.farnell.com/

BLCOMM
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16QAM/QPSK Communication Systems Design
BLCOMM   2/6/2011 9:15:12 AM
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I am Bao, a student at California State University, Long Beach. This is my project requirements: Design a digital communication system capable to transmit digital signal using both QPSK and 16QAM signaling schemes. Data rate about 100 kbps. Input signal to transmitter is human voice, and output signal will be stored in the receiver and then played out from a speaker. Channels will be both wire and wireless. I need help in finding ICs for my project (symbol mapper, quadrature modulators, quadrature oscillators, …)



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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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