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In this paper, we describe the effect of temporal and spatial focusing obtained by using the digital retrodirective beamforming (DRDB) system and analyze BER performance of DRDB in multipath channel. There is a problem with reception performance degraded due to inter symbol interference (ISI) in multipath channel. In order to reduce ISI, the existing communication system use complex equalizer. In...
In this paper, we intend to design a joint system of control and communication engineering which is called Tele-control system. Tele-Control system consists of control plant, controller, feedforward channel and feedback channel in the closed-loop control system. Basically, channels would be multipath channel due to the utilization of wireless communication system. The Existence of multipath channel...
In this paper, we analyze a QAPM (Quadrature Amplitude Position Modulation) scheme for improving power efficiency in multi-path channel. An existing PSSK (Phase Silence Shift keying) modulation is a simple extension from PSK modulation technique. This conventional PSSK modulation technique can be regarded as an extension from PSK modulation. And this PSSK has better power efficiency than PSK modulation...
In order to improve the throughput, the water filling algorithm is considered in the FH- OFDM (frequency hopping - orthogonal frequency division multiplexing) system which combines frequency hopping technique and OFDM technique. This system may be seriously degraded in the multipath and jamming channel. Adaptive bit loading technique using water filling[1] algorithm is used in FH-OFDM system. Via...
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