COMPLEX OPTIMAL SEQUENCES WITH CONSTANT MAGNITUDE FOR FAST CHANNEL ESTIMATION INITIALIZATION

Optimal sounding sequences which satisfy a certain autocorrelation pro perty are useful for fast channel estimation techniques which are base d on noniterative channel sounding methods, In this letter we study op timal sequences consisting of complex symbols with constant magnitude, An indirect sequence construction method is derived by considering th e phase difference between sequence symbols, Our construction method i ncludes periodic and nonperiodic optimal sequences, and provides insig ht into the nature and properties of optimal sequences that are based on consecutive roots-of-unity phase difference sequences.