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Satellite-based positioning is nowadays experiencing an exponential growth of the consumer segment demand and the Global Positioning System (GPS) is the main provider of this service. While GPS performs very well in outdoor conditions, many people still cannot be located when they are in indoor environment. The characteristics of the indoor propagation are still not well understood and the question...
This paper proposes a pilot-aided joint channel estimation and synchronization scheme for burst-mode orthogonal frequency division multiplexing (OFDM) systems over time- and frequency-selective (doubly selective) channels. Based on the basis expansion model (BEM) for representing doubly-selective channels, a least-square (LS) cost function of carrier frequency offset (CFO) and BEM coefficients is...
In the space-time cooperative relay orthogonal frequency division multiplexing (OFDM) system, a challenge is the lack of perfect timing synchronization, which degrades the performance of the receiver greatly. This paper investigates a timing synchronization scheme to solve this problem. Unlike the conventional algorithms, our attempt primarily aims to obtain the different time delays of source and...
This paper deals with the chip-level equalization technique for large area synchronized-code division multiple access (LAS CDMA) system communications. In the downlink of LAS CDMA, frequency-selective multi-path channel often destroys the orthogonality of spread codes at receivers between users and introduces inter-path interference (IPI), inter-symbol interference (ISI) and multi-path access interference...
Correlative minimum shift keying (MSK), a second order polynomial modulation scheme known as tamed frequency modulation (TFM), is a constant envelope type of modulation with a perfect peak to average power ratio (PAPR), besides the property of low out of band power. We apply the linearized TFM to the single carrier transmission with frequency domain equalization (SC/FDE) concept. We then obtain a...
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