General Packet Radio Service (GPRS) is a mobile data service available to users of GSM mobile phones. It is often described as "2.5G", that is, a technology between the second (2G) and third (3G) generations of mobile telephony. It provides moderate
For the last 10 or so years, I’ve been programming in C++. I really enjoy the language for its power, brevity, and accommodation of three major programming styles—structured programming, object-oriented programming, and generic programming. In addit
Based on the renowned Code Excited Linear Prediction (CELP) coding model, the G.729 speech compression standard delivers toll-quality speech, similar in quality to 32-kbps ADPCM but at one-quarter the bit rate. With the low rate of 8 kbps, G.729 is
时差估计算法 Basic aspects of time delay estimation (TDE) based on sampled,signals are investigated in this paper. The direct cross-correlation method is analyzed and compared to the average square difference function (ASDF) and the (addition only based)
2009年全国硕士研究生入学统一考试 英语试题 Section I Use of English Directions: Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on ANSWER SHEET 1. (10 points) Research on animal intelligence always makes me wonder just ho
Due to its potential to offer ubiquitous information access, wireless connectivity is playing an increasingly significant role in communications systems. The success of future wireless systems will depend heavily on their ability to provide high cap
Abstract—In this paper, we analyze spatial multiplexing tech- ques for the downlink of a multiple-input–multiple-output MIMO) orthogonal frequency-divisionmultiplexing (OFDM) sys- m. Our study is focused on outdoor environments characterized y a mod
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Abstract. In this article an OFDM system without the necessity of a cyclic prefix is presented. First a generalised data model that describes different mobile radio systems by a set of parameters is developed. That model is taken as a basis to perfo
Data Fragments Allocation is an important issue in designing Distributed Database System. This problem is NPcomplete, and thus requires fast heuristics and random algorithms to generate efficient solutions, so many algorithms for solving that have b
In this paper, we studied portable blue and red light-emitting-diode (LED) light sources in phototherapy for mild to moderate acne vulgaris to evaluate the efficacy and tolerance of patients. Patients, randomly divided into blue and red groups, recei
A deuterium cluster jet produced in the supersonic expansion into vacuum of deuterium gas at liquid nitrogen temperature and moderate backing pressures is studied by Rayleigh scattering techniques. The experimental results show that deuterium cluster
Connected-annular-rods photonic crystals (CARPCs) in both triangular and square lattices are proposed to enhance the two-dimensional complete photonic bandgap (CPBG) for chalcogenide material systems with moderate refractive index contrast. For the t
