System level design of radio frequency receiver for IEEE 802.16 standard

This paper presents a system level design of radio frequency receiver supporting WiMAX mobile standard. Based on direct conversion receiver, the distribution of the total radio system specifications to the individual receiver components is discussed. System level design techniques and theoretical calculation are developed. Simulation results and system simulation level are introduced for noise figure (NF), gain and linearity (third order intercept point, IIP3). Specifications obtained from the received budget can indicate that the noise and the linearity depend on the gain performance of the corresponding circuit blocks. The receiver achieves a total gain of 23 dB and an IIP3 of -7.8 dBm for low gain mode. It provides up to 68 dB gain, 6.5 dB noise figure and -16 dBm IIP3 for high gain mode.