EE470 Quiz 2

The Section 2 of https://www.gps.gov/technical/ps/2008-SPS-performance-standard.pdf lists this value for the minimum strength of received the GPS signal.

-158.5 dBW

The idle state of an RS232 interface measured at the line driver falls between these two values:

-5 to -15V

Receiver extracts maximum power of -134dBm (from an antenna). If the SNR is 0dB, the BW of the signal must be that many MHz:

0.01MHz

The letters in "PRODANOV" are converted to 8-bit ASCII and the LRC is calculated. The LRC value (in HEX) is:

0x1F

The Hamming distance between the 3 letters in "CAN" is:

1 4 3

An Ibutton device uses this type of a serial interface

1-Wire

HART uses FSK to transmit digital data in a 4-20mA current loop. The frequency deviation is that many kHz

1.2kHz to 2.2kHz (1kHz deviation)

One could use this hardware to produce a parity of 10 bits. Mark all that apply.

10 bit summer with two's complement

A 'packet' of RS232 contains that many bits.

10 bits

A communication system uses differential signaling. The characteristic impedance of the media is likely that many Ohms

120ohms

MOD(23,3) has this value and MOD(-23,3) has this value

2 and 1

The acknowledgement frame in IEEE802.15.4 is that many micro-seconds:

20us

Maximum-length sequence generator employs a 12-stage shift register clock at 1MHz. The period of the produced PN code is approximately that many msec:

4096us

A sensor is outfitted with a 4-20mA interface. If the physical quantity measures 1/4 of its maximum value the reading is that many mA:

8mA

Suppressing the carrier of an ASK modulation creates this type of an angular modulation:

BPSK

Broadcasting of type of (MAC) frame allows for GTS in IEEE802.15.4

Beacon

A SECDED code is generated from this code by doing this:

From Hamming Code by doing "increasing hamming distance by 1"

These codes are 'spreading codes'. Mark all that apply

Gold, Kasami, Bent, No, Gong, Paterson

In the IoT space, IEEE802.15.4 competes against these wireless PAN standards. Mark all that apply.

HR-WPAN(802.16.3), MR-WPAN(Bluetooth)

These codes are 'error detecting' (or correcting) codes. Mark all that apply

Hamming, Convolution, CRC, Interleaving, LDPC, BCH ???normal parity check

These serial interfaces use 'open collector' signaling. Mark all that apply.

I2C, I3C, 1-Wire, LIN Bus, CAN Bus

A wireless sensor network is capable of multi-hop transmission. The network type is most likely:

IEEE 802.15.4, Mesh network, Zigbee Tree

This similarity exist between the hardware required to produce CRC and maximum-length sequences

LFSR (linear-feedback shift register)

Among RS232, I2C, SPI, LIN, CAN, MOST, this serial interface is the 2nd fastest

MOST

Any 1-wire device has this. Mark all that apply.

Master-Slave scheme, half duplex, open collector, Unique 64 bit ID

"Smart Meters" aggregate data over a wide geographical area using this type of wireless (sensor) network topology:

Mesh network Topology

Multiple users in IEEE802.15.4 are accommodated using this multiple-access scheme. Mark all that apply.

Mesh network, star Network

These common serial protocols use differential (balanced) signaling. Mark all that apply.

RS-485,RS-422, CAN-C/CAN-B, MOST,Flexray, MODbus

The HEX values in Table I in Koopman/Chakravarty's paper use this representation (normal, reverse, reciprocal, and reverse reciprocal)

Reverse Reciprocal

An CRC produces a even parity bit. The generating polynomial is:

even number of polynomial terms

Table I in Koopman/Chakravarty's paper lists a CRC of 0x8F8. The corresponding generating polynomial is:

x^12 + x^8 + x^7 + x^6 + x^ 5 + x^4 + 1