This manuscript reported basic examination results of the wireless network communication performance at the coast. We consider that underwater environment condition monitoring is a sort of likely typical application for ubiquitous sensor networks. The result of the experiment shows the performance of the wireless network communication at the coastal area.

The hybrid coding with motion compensated prediction and discrete cosine transform (MC+DCT) has been recognized as the standard technique in motion picture coding. In this paper, a motion estimation processor compatible with ITU-T H.261 and MPEG standards is described. A half-pel precision processing unit is introduced with an exhaustive block matching unit for integer-pel precision search. The necessary processing power for the exhaustive block matching is implemented with a 1-dimensional array structure utilizing a sub-sampling technique. In comparison with the conventional 2-dimensional array structure, path of the data transfer is so simple that the low power dissipation characteristic is obtained. The problem of communication bandwidth to the frame memory, which is a bottleneck of half-pel precision motion estimation, is solved by introducing a candidate pixel buffer into the inter-processor data transfer. A static latch circuit with conflict free operation is newly developed for reducing the power consumption. This chip is capable of processing NTSC-resolution video in real-time at the 40 MHz operation. The chip integrates about 540 k transistors in the 121 mm2 die using 0.8 µm double metal CMOS technology.

This paper studies the effect of frequency re-using patterns on the channel capacity in the forward link of orthogonal code division multiple access (CDMA) cellular systems. The received carrier-to-interference ratio (CIR) determined by computer simulation shows that re-using the same frequency channel on every third sector (3-sector layout) provides superior channel capacity than does every-sector re-use (1-sector layout).

A new unified method is proposed to calculate the basic resonator parameters, i.e., the resonant frequency, external Q, unloaded Q and coupling coefficient in the time domain. By exciting the resonator from a weakly coupled external circuit, one can inject only a narrow resonant spectrum from the broad spectrum of the excitation pulse. The resonant frequency is easily counted by the number of zero crossings of the internal field intensity, whereas the Q's are calculated by the decay rate of the field amplitude. The coupling coefficient computed by the energy exchange rate between two resonators completes the new time domain algorithm.