Multicarrier modulation systems have experienced a tremendous growth in complexity and
possibilities during the past decade, allowing data transmission rates never before imagined,
leading to the commercial appearing of high-definition video on demand on mobile
scenarios, faster Ethernet connections, increased number of digital television channels, etc.
This tremendous change came up with the application of OFDM in various branches related
to information interchange: ADSL and VDSL networks, DVB, WLAN, digital radio,
or even the 4th generation standard for mobile communications (LTE). Therefore, OFDM
is a cornerstone for communication exchange, but at the same time there are some aspects
that might be improved, especially its flexibility and spectral efficiency. Wavelet-Based
communication systems have some advantages like lower transmitted signal Sidelobe Level
(SLL), higher spectral efficiency as well as higher flexibility with respect to OFDM technology.
However, there is an important lack for WPM systems: its structure is complex
and there is a lack of specific equalization schemes for it. In this thesis, we will go in
deep of the Wavelet Packet System and try to find an equivalent and more efficient model,
that leads to a proper specific equalization to improve the characteristics of these systems.
Then, after introducing Wavelet theory and the equalization methods, we will present
the concept of a post-processing equalization scheme, whose main components will be
described in detail. Afterwards the new system will be tested in different scenarios in
order to verify and validate theoretical assumptions, to finally conclude this work with a
summary of conclussions and related work.Ingeniería de Telecomunicació
