# Wireless Communication Problem Set

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1. When the FCC conducted the original A and B block PCS auction, what were the companies that won the license for Cleveland Ohio? What is the MTA number for Cleveland? How many pops were covered by the license?

2. Who was the winner original high bidder(s) for the D-Block auction for Houston BTA? What was the BTA number? What MTA includes the Houston BTA?

3. If Nextel has a monthly ARPU of $62, what is an estimate of the annual revenue for Nextel?

4. What was the Churn for Verizon wireless as of their latest SEC filing? If this figure is a quarterly churn, how many subscribers would Verizon lose next quarter?

5. A typical walkie talkie uses what type of duplex technique?

6. What is the MOS of a GSM AMR codec operating in 12.2 mode and a C/I of 10 db?

7. What are the major differences between a waveform coder and a vocoder? What is coder used in wireless standards

8. Which Modulation technique has the worse noise immunity?

9. How many wireless licenses are available currently in the city of Dallas, Texas in the Cellular and PCS bands? Exclude any pending license relocation.

10. What types of Error correction codes are used in wireless systems? What is the difference between them? Which has the highest gain?

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Solution contains answers, calculations, explanations and references where applicable for each question in the problem set.

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1. When the FCC conducted the original A and B block PCS auction, what were the companies that won the license for Cleveland Ohio? What is the MTA number for Cleveland? How many pops were covered by the license?

Ameritech Wireless (A Block)

AT&T Wireless PCS (B Block)

The MTA number for Cleveland is 16.

Ref: http://www.safecomprogram.gov/admin/librarydocs/csar1appj.pdf

2. Who was the winner original high bidder(s) for the D-Block auction for Houston BTA? What was the BTA number? What MTA includes the Houston BTA?

SprintCom Inc.

BTA number is 196

Houston MTA includes the Houston BTA

Ref: http://www.safecomprogram.gov/admin/librarydocs/csar1appj.pdf

3. If Nextel has a monthly ARPU of $62, what is an estimate of the annual revenue for Nextel

Annual revenue = Average Revenue Per User (ARPU) x 12 x No. of users

= $62 x 12 x 13.9 million

= 10341.6 million dollars

= 10.34 billion dollars

4. What was the Churn for Verizon wireless as of their latest SEC filing? If this figure is a quarterly churn, how many subscribers would Verizon lose next quarter?

According to S&P Research, in 2004, Verizon has averaged a monthly churn rate of under 2%. Verizon has ...

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