After successful completion of the course, students are able to understand and apply the methods described unter the item "Lehrinhalte". This includes the ability to design transmitters and receivers for wireless communication systems that operate with soft-information in all stages. Moreover, students can implement  scheduling methods that retain large amounts of the theoretical multi-user diversity gain while still delay constraints are met.

Scarce system resources in wireless multiuser systems call for efficient use of power and bandwidth. This problem has several dimensions. For each communication link within a multiuser system, the problem is to design efficient, low-complexity source-channel coding algorithms -- for applications with delay constraints, this calls for joint source-channel coding, due to necessarily non-ideal coding algorithms. From a system perspective, the question is how to use the given resources (bandwidth, power) efficiently but still in such as way that the quality-of-service for all users is maximised. The conventional approach will ignore both channel knowledge as well as information about the applications in the medium access layer which is rather wasteful. While using channel knowledge when scheduling users for channel access will allow to achieve large multiuser diversity (transmit power) gains, knowledge about the applications will be crucial to still meet quality-of-service requirements. Joint Source-Channel Coding and Decoding: - Separation theorem of information theory - Practical limitations in real-world systems - Cooperation between source and channel decoding: bad-frame handling in speech transmission - Joint Source-Channel Coding Theory: the optimal system - Channel-Optimised Vector Quantisation - Optimised Index Mappings for Quantisers - Multiple Descriptions - Soft-In/Soft-Out Channel Decoding - Soft-Input Source Decoding - Iterative Source-Channel Decoding Cross-Layer Design: - Open Systems Interconnection Reference Model: basic concept and limitations for wireless systems - Cross-Layer Design: principles - Wireless multiuser systems: Information theoretical aspects - Multiuser diversity gain - Quality-of-Service vs. Throughput - Optimal resource allocation and user scheduling - Practical aspects, delay in particular - Scheduling for wireless: Round Robin, Proportional Fair, Content- and Channel-Aware Scheduling

Presentation of lecture slides

Due to the current restrictions, no lectures (in a lecture room) will be given in the summer term 2021 fpr tho course. Instead, the course will be held online in "flipped-classroom" style.

The lectures notes and further details (including the schedule of the online-lectures) are available here:

https://www.nt.tuwien.ac.at/wp-content/uploads/2021/02/XLDLec.pdf

The first online-meeting is scheduled for 15 April 2021, 14:00.

The link to the online meeting is

https://global.gotomeeting.com/join/193274701

Here are the recordings of the lectures on Iterative Source-Channel Decoding (20 May 2021)

https://owncloud.tuwien.ac.at/index.php/s/aMYzCc9tz3pWuQl

and the one on Cross-Layer Design (27 May 2021)

https://owncloud.tuwien.ac.at/index.php/s/FhaNYOtl5KBEoUE

Oral exam.

Knowledge of the basics of electrical engineering, signals and systems, telecommunications and basic knowledge in information theory as well the contents of the module Signal Processing. The lecture is delivered in English so appropriate command of the language is expected.

There are no compulsory formal prerequisites for the lecture.