Lecture 2

(1) What is more privacy-preserving: network-based or terminal-based positioning (according to the taxonomy in Fig. 6-2)? Explain in 1 sentence.

(2) Is GPS the former or the latter?

(3) How does a GPS receiver distinguish between the signals received from different satellites?

Lecture 3

Answer the following questions in one short sentence each:

(1) Classify the Cricket location system according to the taxonomy of the “Positioning” reading (from last week's Location-Based Services, Chapter 6) shown in Figure 6.2 on page 127. Is it terminal-based or network-based? Is it integrated or stand-alone?

Lecture 4

Provide a short answer for each of the following questions:

(1) In WiTrack, how does FMCW compute the time of flight?

(2) In WiTrack, what is the difference between static and dynamic multipath?

(3) List 2 advantages and 2 disadvantages for WiTrack over the RADAR paper

Lecture 5

The article describes the danger of surveillance using AirTags. In principle, Apple can detect any AirTag moving with someone's iPhone and alert them about it. Give a short explanation why such an approach is not ideal

Lecture 6

Suppose we want to send data from node S to node T in a multi-hop wireless network. The probability of successfully receiving an ACK for a packet sent from S to T directly is q. The other choice is to use an intermediate node, N; the probability of successfully receiving an ACK for a packet from S to N is p, the same as the probability of successfully receiving an ACK for a packet sent from N to T. Using ETX, under what conditions would the direct link from S to T be preferred to the path S — N — T?

Lecture 7

How does Caraoke count cars when multiple E-toll transponders respond at the same time?

Lecture 8

Describe two settings in which inertial sensing can be superior to/preferred over GPS for navigation applications.

Lecture 9

A simple method to detect potholes would be to look at time windows during which the absolute magnitude of the acceleration vector is above some threshold. This will lead to a number of false positives, as described in the paper. After reading the paper, list two sources of such false positives, and how the paper proposes to address them.

Lecture 10

(1) In Hawkeye, why can't the mmWave radar directly create high-resolution heatmaps of the car?

(2) At a high level, what do the generator and discriminator do in a GAN?

Lecture 11

(1) How do heartbeats affect the ear canal in a way that allows APG to measure cardiac events?

(2) What is the main challenge with passive sensing, and why doesn't it work?

Lecture 12

(1) Alice and Ben have invited a few colleagues to an important private meeting. They are however worried that one of their colleagues may use his cell phone to record the conversation at the meeting. Alice claims that she and Ben can use the technique in the paper to prevent such recording. Is Alice right? Explain your answer.

(2) List two advantages for the technique in the paper in comparison with past work on near-ultrasound.

Lecture 13

(1) Why does XaiR employ a split-processing architecture?

(2) What are the advantages and potential trade-offs of this design?

Lecture 15

(1) Why does PAB require much less power than existing underwater communication technologies?

(2) How does the design deal with collisions?

Lecture 16

(1) How does Farmbeats combine aerial imagery with sparse sensor data to generate a fine-grained sensor map?

(2) What are the two constraints that Farmbeats needs to satisfy for duty cycling its IoT operation?