Receiver for bandlimited channel

Introduction

When the communication channel induces intersymbol interference (ISI) to the transmitted digital signal, detection of the transmitted symbols becomes more complicated than in the traditional Additive White Gaussian Noise (AWGN) channel case; more sophisticated receiver architectures are needed. Examples of bandlimited systems include GSM, UMTS, and xDSL. All of these systems employ some form of synchronization, channel estimation and equalizer functions to maintain sufficiently low error rates.

In this laboratory work we study how to detect symbols transmitted over a bandlimited communications channel. A digitally modulated signal is transmitted through a radio channel simulator, sampled using A/D conversion cards, and transferred to MATLAB for further processing. The "receiver" is then implemented in MATLAB and transmitted symbols are detected.

Material

Background material for the lab work  in pdf.

Preliminary exercises in pdf.

Laboratory exercises in pdf.

Hints for the lab, in pdf.
Auxiliary m-files.

Prerequisites

• S-72.3281 Advanced Transmission Methods ( or old version of it S-72.232 Radio Communications Systems)
• Knowledge of MATLAB (or willingness to learn)
• Possibly useful, but not necessary:
• S-72.2205
• S-88.2111
• S-88.4200
• Tik-61.3010
• Tik-61.3040

Literature

• Lecture notes of S-72.2205 Digital Transmission Methods
• Lecture notes of S-72.3281 Advanced Transmission Methods
• Complementary material: Lecture notes of S-88.2111 Signal Processing in Telecommunications I.

• J.G. Proakis: Digital Communications, 3rd edition, McGraw-Hill, Singapore, 1995, 928pp

Some links

• Channel estimation modeling,  a seminar presentation by Markku Pukkila
• Elektrobit   Manufacturer of the radio channel simulator used in the lab work
• MATLAB Signal Processing Toolbox on-line Documentation
• MATLAB Communications Toolbox on-line Documentation

Updated  17-02-2010/Kru