Frequency synchronization and channel estimation for wireless ATM

The frequency-offset estimation of a wireless asynchronous transfer mode (A TM) modem based on the orthogonal frequency division multiplexing (OFDM) is discussed. For burst synchronization operating under the time-division mul tiple access (TDMA) medium access control (MAC), an OFDM preamble using a m ultistage frequency-offset estimation technique is proposed and shown to ha ve a good accuracy with a large estimation range. And also an averaged deci sion-directed channel estimation (ADDCE) technique suitable for burst data is proposed.