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The interference from adjacent beams of a low earth orbiting (LEO) satellite degrades the performance of users in area illuminated by desired beam. This paper investigates the advantages of employing Carrier Interferometry (CI) codes in downlink of a DS-CDMA based LEO satellite link to mitigate such interference. Qualitatively, use of these codes in a downlink LEO satellite channel offers following...
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...
In this paper, two multirate transmission schemes have been proposed for carrier interferometry multicarrier code division multiple access (CI/MC-CDMA) system. System models for wide range of data rates are discussed based on orthogonal property of CI codes of any length. Non-contiguous CI codes have been introduced for multirate CI/MC-CDMA. Advantage of frequency diversity in non-contiguous allocation...
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