Radio frequency identification (RFID) is lagging behind because of vendor specific solutions and expensive implementation cost. In particular, the reader is the most expensive part. A WiFi compatible tag was proposed to use the WNIC as an RFID reader. However, no specific modulator or demodulator was suggested. This paper analyzes the various IEEE 802.11 standards and their modulation and codin...

This paper considers the generic problem of detecting in the presence of additive noise, which one from a set of known signals has been received. In place of the classical matched #lter (MF) receiver we propose a modi#ed receiver. When the transmitted signals are linearly independent this receiver is referred to as an orthogonal matched #lter (OMF) receiver, and when the transmitted signals are...

Bit synchronization is an important operation used at the receiving end of synchronous communication systems for providing a reference bit clock to the receiver; this reference marks the instants at which transition in data bits occur at the transmitting end. In some DPSK demodulator realizarions, like the integrate-and-dwnp scheme, the bit clock is essential for &a recovery itself. But in most...

Submitted for the MAR07 Meeting of The American Physical Society Counting solutions for the CDMA multiuser MAP demodulator JUN-ICHI INOUE, Hokkaido University, J.P.L. HATCHETT, Hymans Robertson — We evaluate the average number of locally minimal solutions for maximum-aposteriori (MAP) demodulation in code-division multiple-access (CDMA) systems [1]. For this purpose, we use a sophisticated meth...

Electrical Impedance Tomography (EIT) is a non-invasive imaging method that can generate image of impedance distribution inside an object. In this imaging method, measured voltages are complex quantities that contain real and imaginary parts. To increase the accuracy of image reconstruction in EIT systems, it is necessary to utilize both real and imaginary parts of measured voltages. Phase sens...

In order to achieve adaptive channel coding and adaptive modulation, the main causes of degradation to system performance are the decoder selection error and modulator estimation error. The utilization of supplementary information, in an estimation system utilizing channel estimation results, blind modulation estimation, and blind encoder estimation using several decoders information and encode...

Previously a novel chaos M-ary digital communication method based on spatiotemporal chaos Hamilton oscillator has been proposed. Without chaos synchronization circumstance, It has performance improvement in bandwidth efficiency, transmission efficiency and anti-whitenoise performance compared with traditional communication method. In this paper, the formula for the design of the boundary of zon...

A novel iterative demodulation and decoding (ID) scheme is proposed for bit interleaved coded modulation (BICM) using co-ordinate interleaving (also known as signal space diversity (SSD)) and the rotation of a signal constellation in a fading channel. A soft-input soft-output demodulator is extended to incorporate SSD and iterative demodulation. It is shown that a well-considered choice of rota...

Here we report experimental results for a carbon nanotube (CNT) based amplitude-modulated (AM) demodulator for modulation frequencies up to 100 kHz. Further, the CNT based demodulator was successfully demonstrated in an actual AM radio receiver operating at a carrier frequency of 1 GHz and capable of demodulating high-fidelity audio. The demodulation originates from the nonlinear current-voltag...