Chapter 1 provides the introduction and history of the Carrier Frequency Offset (CFO). Chapter 2 provides literature survey of IEEE 802.11a, OFDM, AMC and CFO. Chapter 3 provides an introduction to OFDM in general. After a brief history on origin of multicarrier modulation, this chapter describes what OFDM is, and how it can be generated and received illustrating OFDM digital implementation scheme by using the discrete Fourier Transform (DFT) and its counterpart, the inverse discrete Fourier Transform (IDFT). Chapter 4 deals with the physical simulation model. It shows the result for OFDM spectrum, effect of guard interval and simulation results for WLAN channel models. Chapter 5 describes introduction of Carrier Frequency Offset (CFO). It also analyzes detrimental effects of CFO synchronization errors on OFDM system performance as well as on AMC with OFDM. Chapter 6 analyzes the result based on effect of CFO. It also shows the results for comparison of various schemes for estimating the fractional part and Integer part. Chapter 7 conclusions are provided, which summarize the major results obtained in this book and outline possible future work in this field.