Chapter 6Digital transmission model and channel capacity
In this chapter, we define a general model of a digital transmission system, where data must be transmitted reliably to a receiver using an analog transmission medium. We provide a description of the main system parameters. We then focus on detection, a key operation performed at the receiver to properly recover the data. Relevant performance metrics (error probability, capacity, and achievable rates) are introduced and discussed for various channel models and modulation systems.
6.1 Digital transmission model
With reference to Figure 6.1, we discuss some common aspects of a communication systems.
Source. We assume that a source generates a message composed of a sequence of binary symbols , that are emitted every seconds:
Usually, is a sequence of i.i.d. symbols.
The system bit rate, which is associated with the message , is equal to
Channel encoder. In order to detect and/or correct errors introduced by ...
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