Title: PERFORMANCE ENHANCEMENT OF OFDM SYSTEM

Year of Publication: 2012
Page Numbers: 167-175
Authors: Farouk Al-fuhaidy, Mahdi Shagloof, Hossam Eldin Hassan
Conference Name: The International Conference on Computing, Networking and Digital Technologies (ICCNDT2012)
- Bahrain

Abstract:


An Orthogonal frequency division multiplexing (OFDM) is a multicarrier communication technique, which has received a lot of attention in the last few years. This is due to its ability to overcome the frequency-selective fading which is common in wireless broadband communications. The OFDM system suffers a number of drawbacks such as the high peak-to- average power ratio (PAPR). Many PAPR reduction techniques used either destroy the system performance, such as the clipping technique or increases the overall complexity of the system, such as the selective mapping (SLM). In this paper, an OFDM system with carrier Interferometry (CIOFDM) is suggested to reduce the PAPR of the OFDM system. The CI code spreads each of the N low-rate symbol streams across all N subcarriers using orthogonal CI spreading codes. The high PAPR is mitigated with small increases of the system complexity. Moreover, the performance of the system, in terms of BER, is significantly improved compared to the traditional system. The suggested system provides reduction of the PAPR with gain of 4dB. This enables the suggested system to operate with lower input back-off power (IBO), which prolong the life time of the battery and then increase the range of the device. The suggested CIOFDM system is compared with other PAPR reduction techniques using simulations.