An efficient OFDM-based system with an insufficient cyclic prefix via a novel constellation algorithm

Authors : Saeed GHAZIMAGHREBI

Pages : 2278-2292

View : 16 | Download : 10

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :In this paper, a new special triangular constellation scheme is introduced to replace the commonly used rectangular QAM constellation in orthogonal frequency division multiplexing insert ignore into journalissuearticles values(OFDM); modulation. We have shown that this new scheme has 3 major advantages with respect to the well-known QAM. The first advantage is its lower error probability performance, which results from better usage of the constellation space with longer minimum distances. The 2 other advantages are a lower peak to average power ratio insert ignore into journalissuearticles values(PAPR); and higher noise immunity. Both mathematical analysis and simulation results demonstrate that by applying standard channels in 2 cases, i.e. channels with AWGN and channels with burst noise and also with intersymbol interference insert ignore into journalissuearticles values(ISI); impairment simultaneously, the proposed constellation exhibits superior performance compared to the well-known QAM. As a result, this constellation is a good choice for high-speed and real-time OFDM multicarrier applications such as WiFi, WiMAX, DVB, and DAB at no extra cost.
Keywords : Constellation, cyclic prefix, OFDM, QAM, PAPR