# <center><i class="fa fa-edit"></i> Technologies, Standards, and QoS</center>
###### tags: `Internship`
:::info
**Goal:**
- [x] Channel Capacity

**Resources:**
[Notes Page](https://hackmd.io/@j-chen/rkUz8DeUw)
:::

## Technologies, Standards, and QoS

- Channel capacity: max. supported data rate
- Important parameters:
- Data rate (C): bps
- Bandwidth (B): Hz
- Noise (N)
- Bit error rate (BER)
- Goal: maximize C for given B to a target BER requirement
- Shannon capacity: gives upper liit
- Nyquist formula: tells how many levels needed
- Shannon-Hartley Theorem
- Channel capacity C
- Guassian distributed noise
- SNR: signal-to-noise ratio: Eb/N0 = STb/N0 = S/(kTR)


- C can increase by:
- Increase B: increase noise and decrease SNR
- Increase S: non-linearity and results in inter-modulation noise