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Amplificação de potência energeticamente eficiente para sinais mono portadora e multi portadora
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Os recentes avanços tecnológicos, permitiram não só o desenvolvimento da rede móvel, como também permitiram a massificação de dispositivos móveis. Com o crescimento exponencial de utilizadores da rede celular, é necessário garantir ritmos de transmissão elevados e uma redução no consumo energético por parte dos dipositivos. Para garantir ritmos de transmissão elevados, são utilizados sinais multi-portadora como o OFDM (Orthogonal Frequency Division Multiplexing) ou sinais SC-FDE (Single Carrier Frequency Domain Equalization). No entanto, estes sinais são caracterizados por elevada PAPR (Peak-to-AveragePower Ratio) levando a que seja necessário sobre dimensionar os amplificadores de acordo com a gama dinâmica do sinal, sacrificando assim a eficiência energética. Neste trabalho, é proposto um transmissor que realiza uma quantização da envolvente complexa de sinal com elevada PAPR, dividindo-a num somatório de componentes com envolvente constante, permitindo assim utilizar amplificadores a operar na zona de saturação ou próximo desta, minimizando os efeitos não lineares por parte dos amplificadores ao mesmo tempo que se maximiza a eficiência energética do transmissor.
The recent technological advances enabled not only the development of the mobile communication systems, but also led to the massification of mobile devices. While the increase number of users of the cellular network, it is necessary to guarantee high transmis-sion rates and reduced energy consumption by the devices. Signals like OFDM (Orthog-onal Frequency Division Multiplexing) or SC-FDE (Single Carrier Frequency Domain Equalization) can be used to maintain high transmission rates, however, these signals are characterized by high PAPR (Peak-to-Mean Power Ratio) which require linear amplifiers that can amplify the signals accordingly with their dynamic range, thus sacrificing the power efficiency of the amplifiers. In this work, it is proposed a transmitter that performs a signal processing that allows to divide a signal with a high PAPR into a sum of components that have constant envelope. Since the components have constant envelope, it allows the use of amplifiers operating near the saturation zone, minimizing the effects of nonlinear effects of the amplifier while maximizing the power efficiency of the transmitter.
The recent technological advances enabled not only the development of the mobile communication systems, but also led to the massification of mobile devices. While the increase number of users of the cellular network, it is necessary to guarantee high transmis-sion rates and reduced energy consumption by the devices. Signals like OFDM (Orthog-onal Frequency Division Multiplexing) or SC-FDE (Single Carrier Frequency Domain Equalization) can be used to maintain high transmission rates, however, these signals are characterized by high PAPR (Peak-to-Mean Power Ratio) which require linear amplifiers that can amplify the signals accordingly with their dynamic range, thus sacrificing the power efficiency of the amplifiers. In this work, it is proposed a transmitter that performs a signal processing that allows to divide a signal with a high PAPR into a sum of components that have constant envelope. Since the components have constant envelope, it allows the use of amplifiers operating near the saturation zone, minimizing the effects of nonlinear effects of the amplifier while maximizing the power efficiency of the transmitter.
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OFDM (Orthogonal Frequency Division Multiplexing) SC-FDE (Single Carrier Frequency Domain Equalization) PAPR (Peak-to-Average Power Ratio) Eficiência energética