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Alex Reznik
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re: Roundtable: Cellular/Wi-Fi Integration
Alex Reznik   9/6/2012 5:53:49 PM
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Rich raises an interesting point and certainly visible light is a promising emerging technology. However, from a mass deployment point of view, it appears to be quite a few years away, while WiFi presents an existing deployed technology base that operators should (and do) take advantage of today. So, naturally, the present focus is on WiFi. But, to me, the big point here is that cellular operators are moving away from exclusive reliance on licensed spectrum and towards using whatever access technology makes sense in a particular location. And once they figure out how to incorporate one non-cellular technology into their networks, adding others gets that much easier. So WiFi is really paving the way for whatever will come next – be it millimeter-wave, light-based or something completely different.

Les_Slater
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re: Roundtable: Cellular/Wi-Fi Integration
Les_Slater   9/1/2012 2:23:44 PM
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I understand Rich's concerns about potential radiation damage to biological tissue but it seems to me that a long term solution would be to dramatically reduce the required transmit power of the handheld device.



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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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