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1.10.4.2 Adjacent-Channel lnterference
The adjacent channels within the cluster of K cells also can create interference due to
channel filter characteristics. We can figure out the adjacent signals that can leak into
the mobile signal based on the slope of the channel filter. The leaked signals are the
additional interference to the mobile signal. Therefore, the sectorized cells can help
reduce this kind of interference.
1.10.4.3 Simulcast Interference
The data transmitted over two or more transmitters operating on the same RF carrier
frequency is called simulcast. The advantage of using simulcast in an area-wide cover
age is to simplify dispatching or to simplify area-wide, mobile-to-mobile communica
tions. In a mobile radio telephone system, normally no simulcast interference exists.
Recently, simulcast has been used in some systems to improve coverage in mobile
systems.
1.11 Summary
The basic theory of mobile communications is discussed in this chapter. In the following
chapters, we will first discuss the popular propagation models and then move to the
Lee macrocell model, followed by the Lee microcell model and then the Lee in-building
model. Chapter 6 ties all the Lee models together to present an integrated Lee model
that can be applied to all mobile environments.
References
1. Bell Laboratories. "High Capacity Mobile Telephone System Technical Report,"
Submitted to the Federal Communications Commission, December 1971.
2. Lee, W. C. Y. Mobile Communications Engineering: Theory and Applications. 2nd ed.
New York: McGraw-Hill, 1998.
3. Ibid, Chap. 9.
4. Lee, W. C. Y. Wireless and Cellular T e lecommunications. 3rd ed. New York:
McGraw-Hill, 2006.
5. Lee, W. C. Y. Mobile Communications Design Fundamentals. 2nd ed. New York: John
Willey & Sons, 1993.
6. Foschini, G. J. and Gans, M. J. "On Limits of Wireless Communications in a Fading
Environment When Using Multiple Antennas." Wireless Personal Communications 6
(1998): 311-35.
7. Lee, W. C. Y. Lee's Essentials of Wireless Communication. New York: McGraw-Hill, 2001.
.
8. Young, W. R. "Introduction, Background and Objectives-AMPS " Bell System
T e chnical Journal 58 (January 1979): 1-14.
9. IEEE VTS Committee on Radio Propagation. "Lee's Mobile." IEEE Transactions on
Vehicular T e chnology, (February 1988): 68-70.
10. Evans, Greg, Joslin, Bob, Vinson, Lin, and Foose, Bill. "The Optimzation and
Application of the W. C. Y. Lee Propagation Model in the 1900 MHz Frequency
Band," IEEE Transactions on V e hicular T e chnology (March 1997): 87-91.
11. Alotarbi, Faihan 0., and Ali, Adel A. "Tuning of Lee Path Loss Model Based on
Recent RF Measurement in 400 MHz Conducted in Riyadh City, Saudi Arabia."
Arabian Journal o r Science and Engineering 33-lB (April 2008): 145-52.
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