Frequency Division Multiplexing

Recently OFDM(Orthogonal Frequency Division Multiplexing) has been Widely applied in many high speed data transmission fields such as digital audio broadcasting DAB,digital video broadcasting DVB,wireless LAN IEEE 802.11a, and thus attracts great attention of cheap nike shoes researchers and is called one of the possible technologies to realize Beyond 3G mobile communication systems due to its strong anti-multipath interference ability,high spectrum efficiency,implementation simplicity and many other advantages.In mobile communication systems,time variance of the channel originated in high speed relative motion between mobile station and base station,however,leads to a hot women's dresses loss of signal orthogonality,resulting in interference between the sub-carriers(ICI) and system performance reduction.As one key parameter reflecting cheap womens nike shoes channel fading rate,the maximum Doppler frequency can optimize channel tracker step size,update rate of power control algorithms and adjust interleaving lengths.Also,radio network ralph lauren polo shirts control algorithms,such as chi straightener handoff and allocation in cellular discount wedding dresses system,can utilize the Doppler information.With its wide applications in OFDM systems,the algorithm cheap wedding gown dresses research of accurate Doppler spread estimation is indispensable for the design of OFDM mobile communication systems.In this paper,an efficient Doppler estimation algorithm design applies to Rayleigh fading environment is proposed on the basis of existing Doppler estimation algorithms by analyzing the features of OFDM systems and wireless transmission channel.
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