摘自该书的第一张第二节：
The art of designing modern wireless transceivers has seen extensive progress during the last two decades. The design of these transceivers generally must follow three main factors. They should be high performance, low cost, and able to handle the complex objectives of advanced wireless communication systems. A general block diagram of a wireless transceiver using multiple antennas in both the transmitter and the receiver is shown in Figure 1.4.
In recent transceivers, a great amount of signal processing is achieved in the baseband using digital signal processors (DSPs), application specific integrated circuits (ASICs), and field-programmable gate arrays (FPGAs). A signal at the output of the baseband section is up-converted to RF frequency using a heterodyne technique or a direct conversion method. A frequency synthesizer provides the carrier signal for up-conversion. The power amplifiers play a crucial role in providing the performance of the system. The RF front-end delivers the signal to the transmitter antennas. After passing through a wireless channel on the receiver side, the signals of the multiple antennas must be down-converted. This process includes RF signal processing using low noise amplifiers (LNAs), frequency synthesizing, and down conversion. Signals must then be delivered to the receiver baseband.
The excessive signal processing is performed in the receiver to detect the signals. Likewise, on the transmitter side, digital signal processing is carried by receiver digital circuits.
The art of designing modern wireless transceivers has seen extensive progress during the last two decades. The design of these transceivers generally must follow three main factors. They should be high performance, low cost, and able to handle the complex objectives of advanced wireless communication systems. A general block diagram of a wireless transceiver using multiple antennas in both the transmitter and the receiver is shown in Figure 1.4.
In recent transceivers, a great amount of signal processing is achieved in the baseband using digital signal processors (DSPs), application specific integrated circuits (ASICs), and field-programmable gate arrays (FPGAs). A signal at the output of the baseband section is up-converted to RF frequency using a heterodyne technique or a direct conversion method. A frequency synthesizer provides the carrier signal for up-conversion. The power amplifiers play a crucial role in providing the performance of the system. The RF front-end delivers the signal to the transmitter antennas. After passing through a wireless channel on the receiver side, the signals of the multiple antennas must be down-converted. This process includes RF signal processing using low noise amplifiers (LNAs), frequency synthesizing, and down conversion. Signals must then be delivered to the receiver baseband.
The excessive signal processing is performed in the receiver to detect the signals. Likewise, on the transmitter side, digital signal processing is carried by receiver digital circuits.
