Studentische Arbeiten

Titel: On the receiver windowing of UFMC signals over multipath channel
Typ:
  • Forschungsarbeit
Betreuer:
Status: abgeschlossen

Hintergrund

With the fast growing amount of devices which are to be connected to the Internet, future 5G wireless communication systems have to be able to support a very diverse type of traffics. In the road towards 5G, radical changes of various technologies are required to meet the increasing demand of data rate, capacity, latency and etc. Starting from the fundamental aspect of physical layer, the institute is looking into potential alternative waveform technologies to OFDM. One of 5G waveform candidates is  universal filtered multicarrier (UFMC). It can be seen as a generalization of filter-bank multicarrier (FBMC) and OFDM. Based on filtering a group of subcarriers, it combines the advantages of FBMC and OFDM, while avoiding its main drawbacks.

Problemstellung

OFDM is today's prominent modulation scheme, it is applied in various standards such as WLAN and LTE. However, it may not suit all requirements of the expected heterogeneous traffics in 5G. Recently, a novel multicarrier modulation scheme, UFMC, was proposed to enhance the performance of OFDM.

 

Wireless channels exhibit time- and frequency dispersion due to multipath propagation and Doppler effect. Thus, OFDM or UFMC signals after passing through a wireless channel are not orthogonal any more. The channel introduces intersymbol interference (ISI) and inter carrier interference (ICI). In OFDM systems, ISI can be completely mitigated by inserting sufficient long cyclic prefix. In UFMC, cyclic prefix is usually not inserted for better spectral efficiency. Thus, the received UFMC signals are corrupted by ISI and ICI. To further enhance the signal quality at receiver, a time domain preprocessing (windowing) of UFMC signals is considered. In this thesis, the length and shape of the receiver window shall be optimized according to the channel conditions (compromise of ISI and ICI).

Aufgabe

The tasks of this thesis involve:

  • implementation of several standardized wirelss channels
  • optimize receive window for UFMC
  • compare the performance of UFMC and OFDM
  • simulation in Matlab

 

This thesis can be done as Bachelor Thesis.

This thesis can be accomplished in German or English.

Anforderung

 

  • Knowledge of signal processing, OFDM
  • Optimization theory is desirable

 

Kenntnisgewinn

  1. Digital Signal Processing
  2. Multicarrier modulation (UFMC,OFDM)
  3. Wireless Channels
  4. Optimization theory