一种快速FH-OFDM通信帧格式及其验证

针对通信中跳频与正交频分复用两种技术结合存在同步困难的技术难点,提出一种快速跳频OFDM无线宽带通信帧格式,并设计了一种占用带宽为10 MHz、跳频速率为2 kHz、基带数据传输速率为14.324 Mbit/s的快速跳频OFDM通信收发系统.该帧格式使用加长循环前缀的方式提供高精度载波同步依据,将伪随机序列隐藏到频域数据中以便利用其完成精确定时同步、采样时钟同步和整数倍频偏估计,并且插入了梳状导频以便接收端进行信道估计.实验结果表明,接收机星座图可以很好地收敛,在信噪比为10 dB情况下,误码率低于10-8.本帧格式可较好地满足视频等数据的无线通信要求.

A Fast FH-OFDM Communication Frame Format and Its Verification

In view of the FH-OFDM synchronization problem, a fast FH-OFDM wireless bandwidth communication frame format is proposed, and a fast FH-OFDM communication sender and receiver system is designed with 10 MHz bandwidth, 2 KHz hopping rate, and 14.324Mbps baseband data transmission rate for example. In this frame format, a longer cycle prefix is used to provide high precision carrier synchronization basis. A PN sequence is hidden in the frequency-domain data to finish fine timing, sample clock synchronization and integer frequency offset estimation. The comb pilot is inserted to execute the channel estimation. The simulation result show that, in the additive white Gaussian noise channel and the multipath fading channel, the carrier synchronization mean square error is less then 10-4, the sample clock synchronization mean square error is less then 10-10, and the timing error is less than 1 sampling point. The practice results show that the constellation could be converged well, and the bit error rate is lesser than 10-8 under the 10dB signal to noise ratio. The frame format can satisfy wireless communication requirements for video and so on.