冷峻
发表于 2025-3-28 15:48:12
Some Aspects of Data Transmission, be transmitted with any desired degree of fidelity as a discrete number by means of a pulse or a group of pulses having discrete amplitudes. We have seen that the transmission of sequences of numbers, or data, has an increasing application in telephony and television as well as in the transmission
Systemic
发表于 2025-3-28 20:47:40
Limits to Error Performance: Information Theory,mplitudes per second. We have seen in Section 5.6 that, allowing a certain error in the representation and recovery of the sample amplitudes, these amplitudes can be quantized and represented by a number of discrete amplitudes or levels. Further, if we wish we can designate these amplitudes or level
拍下盗公款
发表于 2025-3-29 02:30:06
,Applying Information Theory—Coding and Randomization,gonal codes of ever-increasing bandwidth. In this chapter we shall study another coding scheme, convolutional coding. Convolutional codes give good performance at a moderate bandwidth expansion. They are now nearly universally used as the general-purpose coding technique for communication from dista
宏伟
发表于 2025-3-29 07:06:32
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刺激
发表于 2025-3-29 10:58:22
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nutrients
发表于 2025-3-29 13:17:01
Random Processes and Gaussian Signals and Noise,will provide answers to communication questions that depend on the entire waveform. For example, we may wish to know the actual energy in a noise waveform over some period of time. This is a random variable, but it depends on more than just a single value of the waveform.
BLINK
发表于 2025-3-29 16:24:26
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ligature
发表于 2025-3-29 20:42:27
Sources, Source Encoding, and Source Characterization,accurately gaussian. When we take more and more samples, the sum of the squares of the samples is more and more nearly the number of samples . times the variance σ.. More and more nearly, the signal represented by the . samples will lie within, and, indeed, almost on the surface of an .-dimensional sphere of radius ..σ.
吝啬性
发表于 2025-3-30 01:29:47
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不规则
发表于 2025-3-30 07:03:52
Sources of Noise,it unavoidable, in the process of amplification, so that the amplified signal, prior to detection or demodulation, has some carrier-to-noise power ratio, ../.., or noise-to-carrier power ratio, ../... We will study these phenomena for microwave and optical communication systems in this chapter.