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Future wireless communication systems beyond 2020 will demand diverse requirements on system design that supports a wide range of data rates in overcrowded networks. This paper presents a physical (PHY)-layer system design for ultra-dense network (UDN) with multirate transmission. This proposed scheme transmits user data over highly fragmented spectrum which implies efficient spectrum utilization...
This paper investigates the performance of spread orthogonal frequency division multiplexing (SOFDM) with space frequency block coding (SFBC) technique for underwater acoustic communication through simulation and semi realistic experimentation. Performance of Walsh-Hadamard code spread OFDM (WHSOFDM) and carrier interferometry code spread (CISOFDM) has been evaluated for underwater acoustic communication...
Conventional orthogonal frequency division multiplexing (OFDM) can reduce errors in underwater channels but frequency selective fading can still degrade the data on carriers near deep fade regions. Recently spread-OFDM (SOFDM) which combines the properties of spread spectrum with multicarrier communication has become popular. In this paper spreading by Walsh-Hadamard (WH) codes, discrete Fourier transform...
Discrete Cosine Transform based Orthogonal Frequency Division Multiplexing (DCT-OFDM) is proposed for the first time for Underwater Acoustic Communication. Underwater acoustic channels are characterized as doubly spread channels in time and frequency. The orthogonality feature of conventional OFDM is also provided by inverse DCT (IDCT)-DCT structure with the added advantages of reduced implementation...
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