Simulation and Analysis of Phase Noise Distortion in RF Transceiver of IEEE 802 . 11a WLAN Bridge System

Abstract

these analyses can be applied in early stage of oscillator design for RF transceiver of IEEE 802.11a WLAN system. This paper is organised as follows. The phase noise theory and the IEEE 802.11a standard of constellation error and receiver sensitivity are presented in section II. Then, RF transceiver modeling and simulation method are presented in section III. The simulation results and its analysis are reported in section IV. Concluding remarks are given in section V. II. PHASE NOISE DISTORTION AND IEEE 802.11A In IEEE 802.11a standard, specifications of constellation error and receiver sensitivity are important to ensure that any WLAN system can transmit and receive any information and data with minimum distortions such as oscillator's phase noise and other non-linearity of RF components. A. Phase Noise Distortion Phase noise can be caused by a number of conditions, but mostly affected by oscillator frequency stability (phase fluctuations) due to the random frequency fluctuations of a signal [32]. Noise sources in oscillator circuit can be divided into two groups, namely device noise (such as thermal, shot, and flicker noise) and interference [25]. Modeling and analysis of phase noise can be found in different approach such as harmonic balance (HB) formulations [33],[34], time-domain (TD) formulations [35], [36] and envelope transient (ET) formulations [37],[34]. As shown in Fig. 3, the phase noise of an oscillator is best described in a frequency domain where the spectral density is characterised by measuring the noise "sidebands" on either side of the output signal center frequency, known as single-side-band (SSB) phase noise [32]. Fig. 3. Single side band phase noise representation [32].