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Information: This module is lectured in English. Therefore, this web page is only available in the English language. 

Module: Wireless Communications Lab (40231)

About the Module

Students learn to implement fundamental signal processing algorithms related to cellular and WLAN communication systems as well as wireless channel measurements in Matlab. Wireless communication standards are studied. Fundamental architecture elements and operation principles of Software Defined Radio (SDR) systems are presented.

Further Information

Quick Facts
Module Components:
Two Consecutive Courses:
Wireless Digital Communications Lab I (3LP)
Wireless Digital Communications Lab II (3 LP)
Duration of Module:
Two semesters 
Type of examination:
Portfolio exam
Enrollment for exam:
QISPOS
Total LP:
6
Instructor:
Andreas Kortke
Available to:
This module is open to students enrolled in the Elektrotechnik MSc degree program or the Computer Engineering MSc program.
Prerequisites:
Suitable desired prerequisites for participation to courses are a basic knowledge of information technology, as described in particular in the courses "Signale und Systeme" and "Nachrichtenubertragung" of the field of study "Elektronik und Informationstechnik" of the BSc degree program. Basic knowledge of programming with MatLab is necessary. 
Module Year:
2015/16
Material/Organization:
ISIS
LP = Leistungspunkte/Credits

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Module Content

Wireless Digital Communications Lab I
 
1. Architecture of direct converting RF front-ends: 
  • Sources of noise and impairments (noise figure in concatenated amplifiers, IQ imbalance and quadrature error, carrier leakage, frequency offset, accuracy of crystal oscillators, phase noise; typical values for gain, noise figures, power levels etc. for getting a feeling for the numbers)
  • Simple mathematical description of the frequency conversion and relation to the RF components
 
 2. Fundamentals of UTRA-TDD/FDD transmission:
  • Signal structure, pulse shaping; channelization codes, scrambling codes, midamble codes
  • Frequency assignment
 
 3. Direct spreading transmission over an AWGN channel with delay:
  • Coherence time and coherence length and relation to frequency selectivity
  • Relation of transmitter pulse shaping filter and receiver channel selection low pass filter to Nyquist criteria, impact of synchronization errors and multipath propagation
 
4. CDMA transmission of multiple signals in uplink: 
  • Explanation of the cyclic shifted midamble concept
  • Explanation of cyclic cross correlation function computation in spectral domain
 
 5. CDMA transmission of multiple downlink signals over multipath
    channels, channel simulation:

  • Explanation of channel modelling and channel simulation
  • Presentation of typical channel specific values (delays, excess delays, delay spread, delay profile)
  • Explanation of asymmetry in channel estimation for MAC and BC (uplink / downlink, one sequence per terminal / one sequence at BS for all terminals)
  • Explanation of error noise floor in interference channels (multiuser, multipath)
 
 6. Receive antenna diversity and combining techniques:
  • Explanation of antenna combining methods
  • Introduction of fast fading channel emulator, explanation of certain propagation effects

     

Wireless Digital Communications Lab II
 
 1. Linear multi user channel estimation for UTRA TDD:
  • Explanation of multi user signal and system model and approximate solution of the de-convolution problem (inverse problem)
  • Suppression of multi user interference and self-interference (caused by non-perfect sequence correlation properties) by the inverse Gramian matrix
  • Spectral domain version of the multi-user channel estimation with cyclic shifted midamble code sequences (SVD of Toepliz matrices approach)
 
2. Linear multi user symbol detection in UTRA TDD:
  • Explanation of the signal and system model
  • Explanation of computation with sparse matrices in Matlab
 
3. OFDM transmission according to IEEE 802.11a/g/p WLAN
  • Introduction to the IEEE standardization document (100 page version from year 1999/2000)
  • Transmission experiment with a pre-calculated transmit signal which contains four WLAN signal frames with different data rates

Module Supporting Material

MODULE Source Material - Wireless Digital Communications Labs I AND II
  • Kortke, Andreas. Script on Wireless Digital Communication Lab I, parts 1 to 5. TU-Berlin. Online available for course attendees.
  • Kortke, Andreas. Additional Topics on Wireless Digital Communication Lab I. TU-Berlin. Online available for course attendees.
  • 3GPP. UTRA-TDD Technical Specications and Recommendations (TS 25.102, 25.105, 25.221, 25.223, 25.224, TR 25.990, 25.943). Online available for course attendees.
 In addition, the following book contains background information and is recommended:
  • Stüber, Gordon L., "Principles of Mobile Communication," Third Edition. Springer, 2011.
ADDITIONAL Supporting Material: Wireless Communications Lab II
  • Wireless LAN Medium Access, Control (MAC) and Physical Layer (PHY) Specifications, High-speed Physical Layer in the 5 GHz Band, IEEE Computer Society, 1999

     

 In addition, the following book contains background information and is recommended: 

  • Castoldi, Piero. Multiuser detection in CDMA mobile terminals. Artech House, 2002.

Zusatzinformationen / Extras

Direktzugang:

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COURSE - Wireless Digital Communications Lab I

LV-Nr. 0432 L 658
______________
Dr.-Ing. A. Kortke
______________

COURSE - Wireless Digital Communications Lab II

LV-Nr. 34331600 L 005
______________
Dr.-Ing. A. Kortke
______________