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This paper proposes an analog front-end (AFE) IC using a multiple-frequency driving method (MFDM). The proposed AFE IC achieves a high signal-to-noise ratio (SNR) by using an external noise spectrum and locating the frequencies of the excitation signals in low-noise regions. In addition, it employs the MFDM to increase the frame rate by simultaneously sending excitation signals having multiple frequencies...
As the demand for interactive displays continues to increase, capacitive touch systems (CTSs) with stylus-based drawing have become indispensable [1–4]. Passive styli are widely used because of their low-cost implementation, but have low SNR and limited drawing expressions [1]. Active styli have gained interest to solve these problems [4]. The pressure of an active stylus can be expressed using a...
This paper proposes an in-cell capacitive touch panel structure and a readout circuit (ROIC) to sense the variation in self-capacitance using a small number of sensing lines. The proposed touch panel structure sequentially senses the variation in self-capacitance by adding a thin-film transistor and a scan signal line into each touch sensor so that the number of sensing lines can be reduced. In addition,...
Routing protocols have been widely used in wired networks. In wireless environment, however, cost function of the protocol needs to be modified. We propose a new cost function for routing protocol which considers the unstable condition of wireless links: Using BER (Bit Error Rate) of a link, a channel capacity is calculated and is called effective bandwidth. Performance analysis using simulation shows...
In this paper, we consider channel sounding for multi-sector cooperative beamforming in orthogonal frequency division multiplexing-based wireless cellular systems. The use of conventional sounding schemes may suffer from interference from other sectors and also require large signaling overhead. To reduce the sounding interference near the sector boundary as well as the signaling overhead, we allocate...
The use of a maximum likelihood (ML) detection scheme is known to be optimum to mitigate other-cell interference near the cell boundary. However, it may not be applicable mainly due to implementation complexity. To alleviate this problem, we consider combined use of ML and minimum-mean-square-error based ordered successive interference cancellation (MMSE-OSIC) detection. The proposed scheme considers...
In this paper, we consider a new channel probing scheme for opportunistic scheduling in the uplink of orthogonal frequency division multiplexing (OFDM)-based wireless systems. To reduce signaling overhead for the probing, we consider a two-step channel probing process; called pre-probing and mainprobing. Good subchannels are first estimated through the pre-probing process using a probing signal transmitted...
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