Standard Approach to Estimating Volatility (Equation 15.1 Define on as the volatility per day between day n-1 and day n, as estimated at end of day n-1 · Define, as the value of market variable at end of day i Define ui= In(S /Si-1)
OFDM Systems (N subcarriers) Frequency Available bandwidth is divided into N B subband.Each symbol△f (1kHz) occupies a narrow band but longer time Time