Impact of channel models in MIMO OFDM for LTE

Student thesis: Master Thesis and HD Thesis

  • Troels Jessen
In this report, a study of OFDM receiver algorithms for SISO, SIMO, and MIMO with SMUX and STBC is performed. The algorithms are compared using BER simulations in an uncorrelated Rayleigh fading channel.
The system is extended to include Turbo coding and rate matching complying with the LTE standard, reaching a throughput of 11.2~bits/sec/Hz in an i.i.d. 2x2 Rayleigh fading channel. To maximize the advantage from the Turbo codes, a soft decision demodulator for M-PSK and M-QAM modulation constellations is developed.
Finally, the attention is brought to channel models with spatial correlation, created from statistics and geometry. A geometrically based channel model is developed and evaluated with respect to the Demmel Condition Number, and a comparison between this and the WINNER~II channel model is performed.
Based on the findings in this study, it is concluded that additional antennas add a significant gain in throughput, specifically by obtaining additional diversity from STBC in the low SNR regime and SMUX in the high SNR regime.
Publication date31 May 2012
Number of pages71
ID: 63459094