The Orthogonal frequency division multiplexing (OFDM) technique has been intensively
used in many wireless communication systems to achieve higher data rate transmissions. Due
to the fact that the OFDM technique entails redundant block transmissions; the transmitted
blocks suffer from the inter-symbol interference (ISI) and inter-block interference (IBI). To
compensate this serious effect, in many literatures redundant symbols (or guard interval) with
adequate length are inserted in the transmitted symbols to prevent the IBI. Also, in the receiver
the equalizer can be employed to deal with ISI. In this thesis, we present a new pseudo
random cyclic-postfix (PRCP-) OFDM associated with the multiple-input multiple-output
(MIMO) antenna system configuration to further improve the system performance. In fact, the
MIMO system can enhance channel capacity and achieve high data-rate. The
above-mentioned PRCP-OFDM technique combines with the MIMO antennas system,
through the appropriate model design can be used to combat the multi-path effect or the
inter-block interference. As evident from the simulation results, the proposed ST-BC MIMO
PRCP-OFDM system can avoid the interference of transmitted signals during the estimation
of channel impulse response (CIR) with proposed cyclic-postfix sequences. In addition, to
further improve and eliminate the residual IBI and ICI, the equalizer with the framework of
the generalized sidelobe canceller (GSC) is considered. Specifically, when SNR grows, the
proposed ST-BC MIMO PRCP-OFDM system can perform successfully in terms of
symbol-error rate and semi-blind channel estimation. This is verified via the computer
simulations.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0827111-015220 |
| Date | 27 August 2011 |
| Creators | Tsai, Meng-Han |
| Contributors | Shiunn-Jang Chen, Wan-Jen Huang, Shyh-Neng Lin, Hsin-Hsyong Yang, Miin-Jong Hao |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0827111-015220 |
| Rights | user_define, Copyright information available at source archive |
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