Sung-Yoon Jung

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— In this paper, we deal with the design of preamble signal in order to increase synchronization performance in UWB non-coherent energy detection receiver. We find criteria which can enhance the synchronization performance and propose a scheme to design the preamble signal based on the constrained nonlinear optimization approach with some examples. The(More)
In this paper, we propose a new modulation scheme called multi-coded variable pulse position modulation (MC-VPPM) for visible light communication systems. Two groups of signals (Pulse Width Modulation (PWM) and Pulse Position Modulation (PPM) groups) are multi-coded by orthogonal codes for transmitting data simultaneously. Then, each multi-level value of(More)
Variable pulse position modulation (VPPM) is a new modulation scheme that supports simultaneously illumination with dimming control and communication. In this paper, the transmitter, optical wireless channel, and receiver structure of VPPM were modeled mathematically, and their error performance for examining the communication performance according to(More)
pendent of the bit estimation algorithm. The constant minimum variance method (CMVM) is used to suppress interference , We estimate DS-CDMA channel described by Rayleigh fading using a Kalman filter. A Kalman filter is proposed for the time varying channel estimation. The proposed scheme is constructed without hit estimation, that is, neither training(More)