靠人不如靠己-黑客速成十大绝佳道路
　　黑客，代表着领有高明技巧而又令人捉摸不透的一群神秘集团。作为一般人，在惊羡黑客各种大手笔动作的同时，也非常盼望本人能体验欢乐淋漓的黑客感触。下面，咱们就为你先容十种有趣、存在好莱坞作风的黑客体验，最为重要的是，你无需蒙受任何危险,。
　　一、Uplink（Windows/Mac/Linux）
　　一款十分古老的黑客游戏。“Uplink”由Introversion
Software在2001年宣布。在游戏中玩家需要表演一个神通宽大的黑客，在网络上接受各种任务,，破解世界各地的电脑体系。
　　在游戏中，玩家并不须要懂得良多专业常识，通过该项游戏，玩家反而能学到不少黑客知识。玩家注册进入游戏后，就能够得到一笔初始资金和软硬件。玩家可以应用这些资金和软硬件去接收一些黑客任务，也可以依据教养模式依照步骤实现黑客任务。游戏采取进级的模式，级别越高，任务的难度越大，完成义务后的嘉奖也就越多。
　　该游戏的完全版价钱为15美元，对爱好研究黑客技术的人来说，这一价格切实算不上太贵。
　　二、Codelink（Windows/Flash）
　　Codelink也提供有相似Uplink的黑客攻防体验。不过，它的难度更大，游戏情节也更刺激。更为主要的是，它完整免费。
　　三、The Hacker（浏览器）
Hacker由独破开发商DPFlashes开发，它供给有Uplink跟Codelink的同样游戏休会，不外它的难度比这二者要小得多,，基于阅读器环境，比拟合适全新玩家。
The Hacker
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以上网友发言只代表其个人观点，不代表新浪网的观点或立场。Enhanced Data rates for Global Evolution (EDGE) - Wireless Communications - Nuntius
Wireless Communications & - &
Communications Solutions
Data rates for GSM Evolution (EDGE)
& & EDGE - Overview
Beyond GPRS, EDGE takes the cellular community one step closer to UMTS.
It provides higher data rates than GPRS and introduces a new modulation
scheme called 8-PSK. EDGE is also being adopted by the TDMA community
for their migration to UMTS. Nuntius has solutions for the EDGE handset
functions to help reach handset deployment quicker. For more information,
contact Nuntius Systems, Inc.
Data rates:
kbps and above
Channel coding
block coding
Inner Convolutional coding
Interleaving scheme for error bursts
Modulation
Minimum Shift Keying)
(Phase Shift Keying)
Multiple Access
Combination
of TDMA & FDMA
Frequency bands
Mobile station & &
Base station
Downlink & &
Reverse ch. 890 - 915 MHz
Forward ch. 935 - 960 MHz & &
seperation 45 MHz
carrier spacing & & 200 kHz
of TDMA slots on each carrier & & 8
allocation & & 1 to 8 time slots per TDMA
time slot (Physical channel) & & 0.577 ms
Interval: & & 4.615 ms
Asymmetric
data traffic & & different time slots for Uplink and
Hopping: & & 217 hops/s (slow)
Equalizer:
& & 16 祍 time dispersion
Connectivity:
& & Packet switched data networks such as IP and X.25
Asymmetric
data traffic & & different time slots for Uplink and
Modulation
GPRS Support Node (GGSN) and
Serving GPRS Support Node (SGSN)
coding schemes :
through CS-4, MCS1-MCS9
& & EDGE - Reverse/Forward Link
Composition
data traffic channels
Packet common control channels
dedicated control channels
Transmission
of Uplink Status Flag (USF)
Convolutional
Puncturing
Channel coding schemes(in addition to GPRS)
Peak Rate per slot (kbps)
RLC Block size
Demodulator
Viterbi equaliser
Deinterleaver
Viterbi decoding
& & EDGE - Standard Library Functions
following is a list of the standard library functions to perform the
various aspects of GPRS. These functions can be implemented in a DSP
or the ARM RISC architecture. In general, the layer 1 functions are
usually implemented in the DSP while upper layer protocols such as SNDCP
are implemented in the ARM RISC. The channel models are used for simulating
the channel operating environment and are not a function that would
be implemented in a mobile handset or base station.
Channel codes
Block encoder
Fire coder
of uplink status flags
Convolutional coder (1/2, 2/3 and 3/4)
Puncturing
Interleaver / deinterleaver
Interleaver
of depth 4 / deinterleaver
Channel models
distribution
distribution
Propogation
models for urban and rural areas
Modulation / Demodulation
modulation / demodulation
Channel Decoder
Viterbi decoder}