bandpass modulation error rates

Helsinki University of Technology
Communications Laboratory
Timo O. Korhonen

S-72.227 Digital Communication Systems
Study Guide 5: Fading Multipath Channel

Topics

Time invariant/time variant channels

Channel impulse response/frequency response

Wideband and narrowband channel

Flat fading/frequency selective fading

Statistical/deterministic channel modeling

Delay/Doppler spread

General

What is the difference in characterizing time invariant/variant channels?

Give physical (practical) interpretation of path delay/Doppler spread/Wideband/Narrowband channel/coherence bandwidth/delay spread!

What is the relationship of delay spread and coherence bandwidth/channel bandwidth?

What methods there exits to overcome channel introduced problems at the transmitter /at the receiver?

References

L. Ahlin, J. Zander: Principles of Wireless Communications, pp. 115-147

J.G. Proakis: Digital Communications III Ed, pp. 758-777

http://www-soem.ecu.edu.au/units/ens3547/ens3547.html

http://users.ece.gatech.edu/~mai/tutorial_multipath.htm

http://www.iec.org/tutorials/smart_ant/topic05.html

DAG Instructions

This guide is intended for Discussion Agent Group (DAG) members, but in can be used also by other students. DAG members should get themselves familiar with the lecture material and Study Guide well before the lecture and make clear for themselves the themes they would like to generate discussion. If it appears that there remains unsolved questions after the session they will be discussed in next sessions. It is important to note the time reserved for discussion is maximum of 45 min. only.

Group's tasks

Group should select session Chair. The role of the session chair is to give the floor for audience and to guide discussion generally.

Group should select a secretary whose task is to write down all the questions and answers popping out at the session. The minutes should be submitted to the course instructor within two days and it will appear at the course homepage.

Lecture themes (from lecture transparencies and study guides) must be divided to group members such that each member shall carry about the same workload. Also chair and secretary must participate on drafting the questions.

Member's tasks

Each group member should

Make a list of interesting questions/issues she/he knows the answer. Purpose of these questions is to clarify/underline important topics of the lecture (from one's personal view)
Make a list of topics/themes/details that are not understood
Propose answers to the suggested questions (as listed above)
Ask the suggested questions from the audience during the session