文档介绍：Efficient Implementation of Synchronization in
OFDM System Based on FPGA
Wang Qiang, Tao Cheng, Huang Wei
School of Electronics and Information Engineering,
Beijing Jiaotong University, Beijing 100044,
E-mail: ******@bjtu.
Abstract This paper presents binational synchronization
Msequence 1 ..
method including symbol timing synchronization, fractional _(PN code)
frequency estimate and integer frequency estimate applied to an Number of IFFT points: N
OFDM system based on FPGA. An estimator for OFDM symbol M-sequence length: M(=N/2)
timing synchronization and fractional frequency offsets is
Integer-mapped +1 -1 -1 1
on ...... -1 +1 -1
proposed based conjugate multiplication, Cordic algorithm PN code ;
and autocorrelation properties of PN (Pseudo Noise) codes. All
the sub-modules of synchronization circuit are described in
Verilog HDL or constructed by MegaCore supplied by Altera.
PN code
The results puter simulation show that the Receiver of Inserting zeros + 0 -1 0 -1 0 +1 ...... -1 0 +1 1-10o °
OFDM system applying the algorithm can find the right symbol alternate
Lengthh=2M=N
timing point in the guard interval, meanwhile the fractional
frequency offset can be caught and pensated by
feedforward method, at last, the integer frequency offset that Figure 1. Proposed preamble sequence generation process
exists in the data stream can also p