Phase Noise
Most of the discussions in this chapter have been presented with the baseband representation. Yet, to transmit information across a wireless channel, it is necessary to modulate the baseband information onto a RF carrier. Thus, an oscillator is required to generate the RF carrier. Like all real devices, the oscillator is a source of noise in the system. This section is dedicated to the development of this noise, and its effect on a OFDM system. To develop the noise associated with oscillators, a model is needed. D. P. Newkirk and U. L. Rohde [22] model an oscillator as a feedback system, which is comprised of a phase modulator cascaded with an amplifier and resonator as shown in Figure 5.28. The transfer characteristics of the phase ...
Get OFDM Wireless LANs: A Theoretical and Practical Guide now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
