Comparative study of OFDM system with carrier interferometry code and STBC in flat fading channels

2004 ◽  
Author(s):  
Wanwoo Seo ◽  
Yeonho Chung
Keyword(s):  
Comparative Study ◽  
Fading Channels ◽  
Ofdm System ◽  
Carrier Interferometry ◽  
Flat Fading

CLIPPING DISTORTION SUPPRESSION IN OVERSAMPLED CODED OFDM SYSTEMS USING A NOVEL SOFT DECODING PROCEDURE

2008 ◽  
Vol 08 (03n04) ◽  
pp. L349-L357
Author(s):  
RUHOLLAH ALI-HEMMATI ◽  
PAEIZ AZMI
Keyword(s):  
Fading Channels ◽  
Ofdm Systems ◽  
Selective Fading ◽  
Ofdm System ◽  
Soft Decoding ◽  
Flat Fading ◽  
Selective Channel ◽  
Coded Ofdm ◽  
Clipping Distortion ◽  
Ofdm Signals

In this paper, a soft decoding method is proposed for QAM-modulated coded OFDM systems. This technique efficiently mitigates the distortion caused by clipping the oversampled-OFDM signals. Because the main advantage of an OFDM system is its robustness in fading channels, where this system turns a frequency selective channel into a set of parallel flat non-selective fading sub-channels, in this paper, we analyze the performance of the proposed method over flat fading Rician sub-channels. Our simulation results show that the proposed soft decoding technique significantly outper-forms the conventional hard decoding method.

scholarly journals Performance Analysis of MIMO STBC System in Flat Fading and Frequency Selective Fading Channels

2019 ◽  
Vol 3 (1) ◽  
pp. 19
Author(s):  
Pebri Yeni Samosir ◽  
Nyoman Pramaita ◽  
I Gst A. Komang Diafari Djuni Hartawan ◽  
Ni Made Ary Esta Dewi Wirastuti
Keyword(s):  
Fading Channels ◽  
System Performance ◽  
Mimo System ◽  
Multipath Fading ◽  
Delay Spread ◽  
Selective Fading ◽  
Frequency Selective Fading ◽  
Flat Fading ◽  
Frequency Selective ◽  
Frequency Selective Fading Channels

Multiple Input Multiple Output (MIMO) technology is a technique that can be used to overcome multipath fading. The multipath fading is caused by signals coming from several paths that experience different attenuations, delays and phases. In a multipath condition, an impulse that sent by the transmitter, will be received by the recipient not as an impulse but as a pulse with a spread width that called delay spread. Delay spread can cause intersymbol interference (ISI) and bit translation errors from the information received. To determine the effect of delay spread on the MIMO system, then MIMO system performance research was performed on flat fading and frequency selective fading channels using the Space Time Block Code (STBC) coding technique. This research was conducted using MatLab 2018a software. The simulation results show that the MIMO STBC system performance on flat fading channels is better than the MIMO STBC system performance on the frequency selective fading channel. This result is analyzed based on the value of BER vs. Eb/No and eye diagram.

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