Question
An ADSL system using DMT allocates $3 / 4$ of the available data channels to the downstream link. It uses QAM-64 modulation on each channel. What is the capacity of the downstream link?
Step 1
First, we need to find the number of bits per symbol for QAM-64 modulation. QAM-64 has 64 different signal points, so we need log2(64) = 6 bits to represent each symbol. Show more…
Show all steps
Your feedback will help us improve your experience
Narayan Hari and 57 other educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Ten signals, each requiring $4000 \mathrm{~Hz}$, are multiplexed onto a single channel using FDM. What is the minimum bandwidth required for the multiplexed channel? Assume that the guard bands are $400 \mathrm{~Hz}$ wide.
The crest of a broad-crested weir is 1 ft below the level of an upstream reservoir, where the water depth is 8 ft. For $C_{w} \approx 3.4,$ what is the maximum flow rate per unit width that could pass over the weir?
A flow of $873 \mathrm{ft}^{3} / \mathrm{s}$ passes under a sluice gate in $\mathrm{c}$ rectan gular channel having a gradual contraction in width from 80 fito $52 \mathrm{ft}$ The channel bed has scoured to a level that is 6 in. below the upstream channel bed, owing to the increased velocity ceused by the sluice gate and the contraction. If the upstream flow depth is $4 \mathrm{ft}$ and the sluice gate opening is $1.5 \mathrm{ft}$, compute the depth, velocity, and Froude number of the flow at the end of the contraction.
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD