Five DTV terrestrial broadcasting systems are introduced and two of them are compared, e.g. DVB-T COFDM and ATSC 8VSB.In the second chapter, the capability of combating with the channel fading of OFDM tech is studied and analyzed.

As the characteristics of time-varying and frequency-selective fading of wireless channel, spectrum resource can be utilized more efficiently by adopting the dynamic allocation algorithm, which allocates bit and subcarrier according to channel characteristic of each subcarrier. Hence the bit and subcarrier dynamic allocation algorithms is emphasized in this thesis.

As a multicarrier modulation manner, OFDM (Orthogonal Frequency Division Multiplexing) technique can effectively resist the multipath fading of wireless channels and possesses a high useability of frequency spectrum.

In addition, the capacity fading of LiMn 2O 4 at high temperature is caused by the Jahn Teller effect and the change of LiMn 2O 4 structure at high temperature.

In a weak acidic medium, the reaction of some aminoglycoside antibiotics (AGs) such as kanamycin sulfate (KANA), gentamycin sulfate (GEN), and tobramycin sulfate (TOB) with acid thiazolyl bisazo dye Titan Yellow (TY) can result in the fading of TY.

The fading of the signal amplitude of an unbalanced interference system in response to changes in the emission spectrum of the optical source is investigated.

For Multi-Carrier-Code Division Multiple Access (MC-CDMA) systems, it is usually assumed that the fading of the subcarriers is frequency non-selective and independent of each other.

Influence of surfactants on the fading of malachite green

The effects of dot density and motion coherence on perceptual fading of a target in noise

In this paper are discussed the statistical properties of the averaging adaptive threshold detection in more general conditions in which the sample values may be pure noise or useful signal mixed up in noise and so their probability distributon functions, mean values and variances may be the same or different. This averaging adaptive threshold detection is a generalization of Reference [2], It may be Used in both digital communication and radar. When the adaptive detection is used in Rayleigh fading of...

In this paper are discussed the statistical properties of the averaging adaptive threshold detection in more general conditions in which the sample values may be pure noise or useful signal mixed up in noise and so their probability distributon functions, mean values and variances may be the same or different. This averaging adaptive threshold detection is a generalization of Reference [2], It may be Used in both digital communication and radar. When the adaptive detection is used in Rayleigh fading of short wave telegram communication, its error rates are less than any fixed threshold detection with respect to any input signal noise ratio.

Basing on the characteristics of railway mobile communication and a large quantity of measured data, this paper obtains propagation curves with regard to the field strength —— distance —— height of antenna by method of mathematical statistiesoStudies also are conducted on the rule of fading of field strength along the railway line. A function of probability distribution of fading is derived and the deviation coefficient and probability coefficient of field strength are obtained. It may prove to be...

Basing on the characteristics of railway mobile communication and a large quantity of measured data, this paper obtains propagation curves with regard to the field strength —— distance —— height of antenna by method of mathematical statistiesoStudies also are conducted on the rule of fading of field strength along the railway line. A function of probability distribution of fading is derived and the deviation coefficient and probability coefficient of field strength are obtained. It may prove to be useful in estimating VHF and UHF field strength for railway mobile communication.

In this paper, a new ultrasonic method of measuring the amount of sand contained in fluid or in sediment model has been introduced. Its principle is based on two considerations: one is that the number of the ultrasonic reflecting waves from the floating sand in fluid is proportional to the amount of sand contained in fluid and the other is that the fading of the ultrasonic wave in fluid increases, following exponential law, with the increase of the amount of sand con tained in fluid. A basic formula is...

In this paper, a new ultrasonic method of measuring the amount of sand contained in fluid or in sediment model has been introduced. Its principle is based on two considerations: one is that the number of the ultrasonic reflecting waves from the floating sand in fluid is proportional to the amount of sand contained in fluid and the other is that the fading of the ultrasonic wave in fluid increases, following exponential law, with the increase of the amount of sand con tained in fluid. A basic formula is then found and it coincides with the results of a large amount of experiments on different model sand.