---
# System prepended metadata

title: HW5
tags: [' ss', Communication System Design, ' ncu']

---

---
tags: Communication System Design, ss, ncu
author: N0-Ball
title: HW5
GA: UA-208228992-1
---

[TOC]

# a
:::info
Plot a square pulse representing a digital 1 at the transmitter.
:::


## Ans
![](https://i.imgur.com/lHTYyWG.png)

# b
:::info
Plot the FFT for the square pulse. Mark your axes clearly with proper labels and units.
:::

## Ans
![](https://i.imgur.com/lAVBukm.png)

# c
:::info
You send the digital 1 through this channel of limited bandwidth. What is the waveform of the 
digital 1 at the receiver?
:::

## Ans
![](https://i.imgur.com/ajE5uGO.png)

# d
:::info
You are sending a data stream of 1 0 1 0 0 0 1 1 0 1 over the link. What is the waveform of the data 
stream after it is transmitted through the link?
:::

## Ans
![](https://i.imgur.com/oZ3o14h.png)

# e
:::info
Can the designated receiver decode the original message correctly? Can this system prevent ISI?
Discuss.
:::

## Ans
Green
:    Original Signal

Blue
:    Final Signal

![](https://i.imgur.com/bWpeHKV.png)
- If there is no ISI, the peak of the Original Signal should be the same of the Final Signal, since other signals that is not the original signal should be 0 if there is no ISI, that is, except the Original Signal, other signals should be 0 voltage, thus sum equals to 0; therefore, there is ISI.


![](https://i.imgur.com/lhKhCvj.png)
- If there is no ISI, the intersection to the origin of the Origin Signal and the Final Signal should be the same, since if there is no ISI, every signal should have the same intersection to the origin ( be 0 at certain time); therefore, there is ISI.