Abstract
Problem statement: The Multiple Input Multiple Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) system has been receiving a great attention, as one of solutions for achieving high speed, efficient and high-quality service for the wireless communications. However, the transmitted signal still has high PAPR because of OFDM characteristics. Many methods have been proposed to solve this problem, but the most of them decrease high Peak-to-Average Power Ratio (PAPR) as well as the data rate. Approach: This proposal described a new suboptimal technique for reduction of the PAPR by combining two suitable methods for MIMO OFDM systems. The first method was based on Boolean Particle Swarm intelligence Optimization (BPSO) applied to Partial transmit Sequence (PTS) and the second was the Space Time Bloc Coding (STBC). Result: Apply only the PTS technique and independently on each transmitted antenna, was effective to reduce PAPR, but it requires high computation complexity. Therefore, the BPSO/PTS technique provided better performance and it was been promoted as an uncomplicated way for PAPR reduction. Thanks of the BPSO/PTS algorithm; the transmitted sequence was selected with minimizing the maximum PAPR over all transmission antennas. The simulations and the BER performance demonstrated that more inertia weight and phase weighting factor obtained better PAPR reduction performance without bringing much higher complexity. Conclusion: Results show that the added BPSO/PTS method to orthogonal space time bloc coding minimizes computational complexity cost as well as the PAPR and gives best optimal PTS performance in comparison with the conventional methods.
Highlights
The growing development of the telecommunication world increases the need for spectral resources, especially that those are more and more rare and expensive, so the use of the multiplexing techniques in particular the modulations multi-carrier is a very useful mean to better optimize these resources
Broadcasting), the Digital Video Broadcasting (DVBT), the Digital Asymmetric Subscriber Line (ADSL), the High Performance Radio Local Network (HIPERLAN) and the Worldwide Interoperability for Microwave Access (WIMAX). This technique undergoes a lot of successes recently thanks to their intrinsic hardiness to the selective canals in frequency and their sufficient robustness to radio channel impairments (Krongold and Jones, 2003). This is the one of the reasons which makes the modulation Orthogonal Frequency Division Multiplexing (OFDM) used for Multiple Input Multiple Output (MIMO) technology on which we concentrated in this project
We perform a new method using space time bloc coding combined to Boolean Particle Swarm intelligence Optimization (BPSO)/Partial transmit Sequence (PTS) technique to reduce the Peak-to-Average Power Ratio (PAPR) of MIMO OFDM systems as well as computational complexity
Summary
The growing development of the telecommunication world increases the need for spectral resources, especially that those are more and more rare and expensive, so the use of the multiplexing techniques in particular the modulations multi-carrier is a very useful mean to better optimize these resources. Broadcasting), the Digital Video Broadcasting (DVBT), the Digital Asymmetric Subscriber Line (ADSL), the High Performance Radio Local Network (HIPERLAN) and the Worldwide Interoperability for Microwave Access (WIMAX). This technique undergoes a lot of successes recently thanks to their intrinsic hardiness to the selective canals in frequency and their sufficient robustness to radio channel impairments (Krongold and Jones, 2003). The OFDM signals possess a very wide band and present a big variation of amplitude This characteristic is the very sensitive return to the not-linearity of the analogical components, in Corresponding Author: Karima El Mouhib, Team of Telecommunications and Networks, Faculty of Science Semlalia, Cadi Ayyad University, Marrakesh, Morocco
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