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Orthogonal Frequency Division Multiplexing (OFDM) systems are sensitive to timing and frequency estimation errors. A DFT spread modified polyphase training sequence is proposed which has better merit factor and peak to average power ratio. By using the proposed training sequence two estimators are presented for timing and frequency synchronization. The CRLB expressions in closed form for these two...
A novel synchronization estimator is proposed for differential encoding orthogonal frequency division multiplexing (OFDM). Exploiting differential encoding, our synchronization estimator is carried out with a cost function which is independent of channel knowledge. Using only one specially designed training symbol and differential encoding, the algorithm can efficiently estimate frequency offset....
This paper addresses training-sequence-based joint fine time adjustment and channel estimation for orthogonal frequency-division multiplexing systems. The proposed approach first derives an optimized threshold that adapts to the channel statistic and the signal-to-noise ratio. Then a practical suboptimal threshold is presented to avoid the estimation of the channel statistic. The suboptimal threshold...
This paper presents a study of generalized chirp-like (GCL) sequence for frequency synchronization in IEEE 802.16- 2004 standard application. GCL sequence, a special class of polyphase sequence that it is, has a lower PAPR preamble for synchronization in OEDM system than PN sequence based preamble. The method of synchronization is based on Schmidl and Cox. The result shows that, GCL sequence based...
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