Chapter 13Techniques to achieve capacity
In this chapter, we introduce practical solutions that provide bit rates close to capacity. First, we consider the parallel channel, comprising a set of independent narrowband (NB) additive white Gaussian noise (AWGN) subchannels: such a channel is found when considering multicarrier (MC) single‐input‐single‐output (SISO) transmissions over a dispersive AWGN channel, or when applying a suitable precoder and combiner to a multiple‐input‐multiple‐output (MIMO) NB AWGN channel. Then, we provide solutions tailored to single‐carrier SISO transmissions, combined with joint precoding and coding techniques.
13.1 Capacity achieving solutions for multicarrier systems
In the following, we discuss techniques to achieve capacity, with reference to the orthogonal frequency division multiplexing (OFDM) system modelled in (8.83), comprising 
subchannels, with AWGN with power 
and gain 
on subchannel 
, 
. The considered techniques can also be applied in other ...
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