交叉熵算法是目前逐步优化而形成的的一种计算方法,在解决多种优化组合的问题上具有较好的性能。在基于信道均方误差的准则下,本文基于交叉熵算法,提出一种适用于非连续正交频分复用(Non-contiguous Orthogonal Frequency Division,NC-O...交叉熵算法是目前逐步优化而形成的的一种计算方法,在解决多种优化组合的问题上具有较好的性能。在基于信道均方误差的准则下,本文基于交叉熵算法,提出一种适用于非连续正交频分复用(Non-contiguous Orthogonal Frequency Division,NC-OFDM)系统上的导频设计方法。该方法先按照伯努利分布生成导频位置的随机样本,得出信道估计的最小均方误差(Minimum Mean Square Error,MSE)的样本值,然后通过更新规则对分布参数进行更新,经过几次迭代得到较优的导频位置。仿真结果表明,使用该方法得到的信道具有更好的MSE性能及误比特率(Bit Error Rate,BER)性能。展开更多
基于非连续正交频分复用(non-continuous orthogonal frequency division multiplexing,NC-OFDM)模型,提出和研究了选择映射(selected mapping,SLM)算法和部分传输序列(partial transmit sequence,PTS)算法,及其SLM-PTS融合优化技术,设...基于非连续正交频分复用(non-continuous orthogonal frequency division multiplexing,NC-OFDM)模型,提出和研究了选择映射(selected mapping,SLM)算法和部分传输序列(partial transmit sequence,PTS)算法,及其SLM-PTS融合优化技术,设计了融合模型和改进流程。仿真结果与其他文献方法进行了对比,验证了SLM-PTS的融合具有优秀的峰值平均功率比(peak to average power ratio,PAPR)降低能力,但缺点是算法实现复杂度过高。因此,又进一步提出了互补型映射和限幅的联合算法(SLM-Clipping)融合解决方案,并利用深度学习方法建立PAPRnet模型。仿真结果验证了此算法对NC-OFDM系统具有PAPR良好的抑制效果,而且能够提高仿真运算效率。展开更多
A protective synchronization scheme （ProSync） for the non-contiguous orthogonal frequency-division multiplexing （NC-OFDM） system is proposed in this paper, aiming to minimize the impact of cross-band interference ...A protective synchronization scheme （ProSync） for the non-contiguous orthogonal frequency-division multiplexing （NC-OFDM） system is proposed in this paper, aiming to minimize the impact of cross-band interference in opportunistic dynamic spectrum sharing networks. ProSync partly shrinks the preamble at the transmitter and exploits two multi-band filters at the receiver. By doing so, the potential interference suffered by NC-OFDM users, including both the cross-band interference and self interference, can be greatly reduced. Simulation results verify the effectiveness of ProSync, which is able to lower the carrier frequency offset （CFO） estimation error by up to 50%, compared with the traditional method.展开更多
文摘交叉熵算法是目前逐步优化而形成的的一种计算方法,在解决多种优化组合的问题上具有较好的性能。在基于信道均方误差的准则下,本文基于交叉熵算法,提出一种适用于非连续正交频分复用(Non-contiguous Orthogonal Frequency Division,NC-OFDM)系统上的导频设计方法。该方法先按照伯努利分布生成导频位置的随机样本,得出信道估计的最小均方误差(Minimum Mean Square Error,MSE)的样本值,然后通过更新规则对分布参数进行更新,经过几次迭代得到较优的导频位置。仿真结果表明,使用该方法得到的信道具有更好的MSE性能及误比特率(Bit Error Rate,BER)性能。
文摘基于非连续正交频分复用(non-continuous orthogonal frequency division multiplexing,NC-OFDM)模型,提出和研究了选择映射(selected mapping,SLM)算法和部分传输序列(partial transmit sequence,PTS)算法,及其SLM-PTS融合优化技术,设计了融合模型和改进流程。仿真结果与其他文献方法进行了对比,验证了SLM-PTS的融合具有优秀的峰值平均功率比(peak to average power ratio,PAPR)降低能力,但缺点是算法实现复杂度过高。因此,又进一步提出了互补型映射和限幅的联合算法(SLM-Clipping)融合解决方案,并利用深度学习方法建立PAPRnet模型。仿真结果验证了此算法对NC-OFDM系统具有PAPR良好的抑制效果,而且能够提高仿真运算效率。
文摘A protective synchronization scheme （ProSync） for the non-contiguous orthogonal frequency-division multiplexing （NC-OFDM） system is proposed in this paper, aiming to minimize the impact of cross-band interference in opportunistic dynamic spectrum sharing networks. ProSync partly shrinks the preamble at the transmitter and exploits two multi-band filters at the receiver. By doing so, the potential interference suffered by NC-OFDM users, including both the cross-band interference and self interference, can be greatly reduced. Simulation results verify the effectiveness of ProSync, which is able to lower the carrier frequency offset （CFO） estimation error by up to 50%, compared with the traditional method.
