Cellular Wireless Networks - Lecture 28

OFDM Quadrature Phase Shift Keying (QPSK) symbol represents 2 bits Example of OFDM/QPSK scheme: occupies 6 MHz made up of 512 individual carriers, with a carrier separation of a little under 12kHz data are transmitted in bursts bursts consist of a cyclic prefix followed by data symbols cyclic prefix absorbs burst transients waveform from multipath signal is gone, resulting in no ISI Summary principles of wireless cellular networks cellular network organization operation of wireless cellular networks first-generation analog second-generation CDMA RAKE receiver IS – 95 3G systems 4G systems OFDM and OFDMA