Blake: MCQ in Personal Communications Systems

(Last Updated On: January 10, 2018)
Blake: MCQs in Personal Communications Systems

This is the Multiple Choice Questions in Chapter 22: Personal Communications Systems from the book Electronic Communication Systems by Roy BlakeBlake: MCQ in Personal Communications Systems. If you are looking for a reviewer in Communications Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.


1. Current PCS systems are referred to as:

  • a. first-generation
  • b. second-generation
  • c. third-generation
  • d. digital-generation


2. The frequency band designated for PCS in North America is:

  • a. 800 MHz
  • b. 900 MHz
  • c. 1.9 GHz
  • d. 12 GHz


3. The "forward" PCS channel is:

  • a. from the base to the mobile
  • b. from the mobile to the base
  • c. from mobile to mobile
  • d. same as the uplink


4. Compared to AMPS, PCS cell sites are:

  • a. bigger
  • b. smaller
  • c. distributed
  • d. higher-power


5. AMPS was designed for:

  • a. POTS
  • b. voice
  • c. use built into an automobile
  • d. all of the above


6. The number of competing PCS systems in North America is:

  • a. 2
  • b. 3
  • c. 4
  • d. many


7. CDMA technology was invented by:

  • a. AT&T
  • b. Lucent
  • c. Bell Labs
  • d. Qualcomm


8. GSM is used in:

  • a. Asia
  • b. Europe
  • c. North America
  • d. all of the above


9. In GSM, voice channels are called:

  • a. traffic channels
  • b. voice channels
  • c. bearer channels
  • d. talking channels


10. AMPS uses:

  • a. CDMA
  • b. TDMA
  • c. spread-spectrum
  • d. none of the above


11. Other things being equal, battery life in a GSM phone should be:

  • a. less than in a TDMA phone
  • b. no better than in an AMPS phone
  • c. greater than in a TDMA phone
  • d. no better than a TDMA phone


12. It is necessary to send control information on traffic channels in:

  • a. no PCS system
  • b. GSM only
  • c. TDMA only
  • d. both GSM and TDMA


13. GSM uses:

  • a. frequency hopping
  • b. direct-sequence modulation
  • c. CDMA
  • d. all of the above


14. In GSM, SIM stands for:

  • a. Short Inbound Message
  • b. Subscriber-Initiated Message
  • c. Subscriber ID Module
  • d. Subscriber ID Method


15. IMSI stands for:

  • a. Integrated Mobile Subscriber Identification
  • b. International Mobile Subscriber Identification
  • c. Interim Mobile Subscriber Identification
  • d. Intermodulation System Interference


16. IS-95 uses:

  • a. frequency hopping
  • b. TDMA
  • c. CDMA
  • d. all of the above


17. IS-136 uses:

  • a. frequency hopping
  • b. TDMA
  • c. CDMA
  • d. all of the above


18. In CDMA:

  • a. all frequencies are used in all cells
  • b. each cell uses half the available frequencies
  • c. each cell is assigned a frequency by the base
  • d. the frequency is selected by the mobile phone


19. CDMA uses a set of PN sequences that are:

  • a. common
  • b. unique
  • c. rotating
  • d. orthogonal


20. The next generation of PCS is expected to have:

  • a. faster data rates
  • b. Internet access
  • c. wider roaming area
  • d. all of the above



1. PCS stands for ____________________ Communications System.

ANS: Personal

2. Current PCS systems are called ____________________-generation systems.

ANS: second

3. In North America, PCS is assigned the ____________________-MHz band.

ANS: 1900

4. Compared to AMPS, PCS cells are ____________________ in size.

ANS: smaller

5. Besides TDMA and CDMA, ____________________ is also used in North America for PCS.


6. The spread-spectrum technique used in IS-95 PCS is ____________________.



direct sequence

7. The spread-spectrum technique used in GSM is _________________________.

ANS: frequency hopping

8. Unlike AMPS, CDMA allows for a ____________________ handoff.

ANS: soft

9. The orthogonal PN sequences used in CDMA are called a ____________________ code.

ANS: Walsh

10. Unlike other systems, in CDMA ____________________ frequencies are used in all cells.

ANS: all

11. PN stands for Pseudo-____________________ Noise.

ANS: random

12. ____________________ diversity is inherent in any spread-spectrum system.

ANS: Frequency

13. RF channel S/N ratios ____________________ than zero are typical in CDMA systems.

ANS: less

14. CDMA uses a ____________________-rate vocoder.

ANS: variable

15. A phone user typically talks less than ____________________% of the time during a conversation.

ANS: 50

16. CDMA requires ____________________-loop power control to work properly.

ANS: closed

17. GPRS stands for General ____________________ Radio Service.

ANS: Packet

18. IMT stands for International ____________________ Telecommunications.

ANS: Mobile

19. UPT stands for ____________________ Personal Telecommunications.

ANS: Universal

20. UWT stands for Universal ____________________ Telecommunications.

ANS: Wireless

21. W-CDMA stands for ____________________ CDMA.

ANS: Wideband


1. What is the advantage of a "soft" handoff?


No calls are dropped.

2. If CDMA receivers hear all frequencies all the time, how do they pick a specific frequency?


Each frequency is modulated using a separate orthogonal PN sequence. To demodulate, the receiver uses the PN sequence specific to the channel it wants.

3. What is the effect of cochannel interference in CDMA?


It increases the background noise level, but CDMA can tolerate a lot of such noise.

4. How does GSM achieve frequency diversity?


It uses limited frequency hopping.

5. Why was PCS assigned to 1.9 GHz instead of the 800-MHz band used for AMPS?


The 800 MHz band was already overcrowded.

6. Why would a battery in a GSM phone be expected to last longer than a battery in a TDMA phone?


A TDMA phone is active during one out of every three time slots. A GSM phone is active during one out of every eight.

7. What is the advantage of using offset QPSK over standard QPSK?


With standard QPSK, the transmitted power repeatedly goes to zero. With offset QPSK, it never goes to zero. Linearity requirements are less strict for offset QPSK transmitters.

8. What is the "near/far" effect in CDMA, and what causes it?


A stronger station farther away can "drown out" a weaker station that is near. This happens when the power transmitted by mobile units is not well controlled by the base.

Complete List of MCQs in Electronic Communication Systems by Blake

Blake: MCQ in Personal Communications Systems
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