A NOVEL CONSTRUCTION TECHNIQUE FOR DESIGNING OF VIDEO APPLICATION USING WIRLESS 4G
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| Title | A NOVEL CONSTRUCTION TECHNIQUE FOR DESIGNING OF VIDEO APPLICATION USING WIRLESS 4G |
| Authors | |
| Abstract | In an OFDM scheme, a large number of orthogonal, overlapping, narrow band sub-channels or subcarriers, transmitted in parallel, divide the available transmission bandwidth. The separation of the subcarriers is theoretically minimal such that there is a very compact spectral utilization. The attraction of OFDM is mainly due to how the system handles the multipath interference at the receiver. Multipath generates two effects: frequency selective fading and inters symbol interference (ISI). The "flatness" perceived by a narrow-band channel overcomes the former, and modulating at a very low symbol rate, which makes the symbols much longer than the channel impulse response, diminishes the latter. Using powerful error correcting codes together with time and frequency interleaving yields even more robustness against frequency selective fading and the insertion of an extra guard interval between consecutive OFDM symbols can reduce the effects of ISI even more. Thus, an equalizer in the receiver is not necessary. OFDM is becoming the chosen modulation technique for wireless communications. OFDM can provide large data rates with sufficient robustness to radio channel impairments. The purpose of this method is to provide visualize simulating the basic processing involved in the generation and reception of an OFDM signal in a physical channel and to provide a description of each of the steps involved. For this purpose, we shall use, as an example, one of the proposed OFDM signals of the Digital Video Broadcasting (DVB) standard in wireless 4G (3GPP-LTE). |
| Publisher | World Science Publisher |
| Date | 2012-04-02 |
| Source | 2166-2916 |
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