In this paper, a novel timing offset estimation algorithm of low complexity is presented, which needs a few pilots. The results of simulation prove that the system performance with timing offset correction is approxim...In this paper, a novel timing offset estimation algorithm of low complexity is presented, which needs a few pilots. The results of simulation prove that the system performance with timing offset correction is approximate to that over AWGN channel.展开更多
One of the biggest challenges in ultra-wideband （UWB） radio is the accurate timing acquisition for the receiver. In this article, we develop a novel data-aided synchronization algorithm for pulses amplitude modulati...One of the biggest challenges in ultra-wideband （UWB） radio is the accurate timing acquisition for the receiver. In this article, we develop a novel data-aided synchronization algorithm for pulses amplitude modulation （PAM） UWB systems Pilot and information symbols are transmitted simultaneously by an orthogonal code division multiplexing （OCDM） scheme. In the receiver, an algorithm based on the minimum average error probability （MAEP） of coherent detector is applied to estimate the timing offset. The multipath interference （MI） problem for timing offset estimation is considered. The mean-square-error （MSE） and the bit-error-rate（BER） performances of our proposed scheme are simulated. The results show that our algorithm outperforms the algorithm based on the maximum correlator output （MCO） in multipath channels.展开更多
针对低压电力线信道噪声干扰强、多径衰落严重,而传统同步算法保密性弱、小数倍载波频偏估计易受多径衰落影响的缺点,提出一种适合于低压电力线通信信道的正交频分复用(orthogonal frequency division multiplexing,OFDM)时频同步算法...针对低压电力线信道噪声干扰强、多径衰落严重,而传统同步算法保密性弱、小数倍载波频偏估计易受多径衰落影响的缺点,提出一种适合于低压电力线通信信道的正交频分复用(orthogonal frequency division multiplexing,OFDM)时频同步算法。将超混沌系统生成的混沌序列用于构造同步训练序列,提出新的定时偏差估计和小数倍频偏估计的算法,在延续循环移位的思想的基础上完成整数倍频偏估计。理论分析表明,混沌系统对初始值的敏感性与所提出的算法相结合,可极大地增强系统的保密性。仿真结果表明,所提出的定时偏差估计准确率高、频偏估计性能更优,能有效地对抗低压电力线通信信道的强噪声和多径衰落。展开更多
文摘In this paper, a novel timing offset estimation algorithm of low complexity is presented, which needs a few pilots. The results of simulation prove that the system performance with timing offset correction is approximate to that over AWGN channel.
基金the National Natural Science Foundation of China （60572118）.
文摘One of the biggest challenges in ultra-wideband （UWB） radio is the accurate timing acquisition for the receiver. In this article, we develop a novel data-aided synchronization algorithm for pulses amplitude modulation （PAM） UWB systems Pilot and information symbols are transmitted simultaneously by an orthogonal code division multiplexing （OCDM） scheme. In the receiver, an algorithm based on the minimum average error probability （MAEP） of coherent detector is applied to estimate the timing offset. The multipath interference （MI） problem for timing offset estimation is considered. The mean-square-error （MSE） and the bit-error-rate（BER） performances of our proposed scheme are simulated. The results show that our algorithm outperforms the algorithm based on the maximum correlator output （MCO） in multipath channels.
文摘针对低压电力线信道噪声干扰强、多径衰落严重,而传统同步算法保密性弱、小数倍载波频偏估计易受多径衰落影响的缺点,提出一种适合于低压电力线通信信道的正交频分复用(orthogonal frequency division multiplexing,OFDM)时频同步算法。将超混沌系统生成的混沌序列用于构造同步训练序列,提出新的定时偏差估计和小数倍频偏估计的算法,在延续循环移位的思想的基础上完成整数倍频偏估计。理论分析表明,混沌系统对初始值的敏感性与所提出的算法相结合,可极大地增强系统的保密性。仿真结果表明,所提出的定时偏差估计准确率高、频偏估计性能更优,能有效地对抗低压电力线通信信道的强噪声和多径衰落。
