在对传统LTE-OFDM深入研究的基础上,针对滤波OFDM(F-OFDM)技术特点,设计了数据帧格式,建立F-OFDM基带系统模型,通过对2个子带进行滤波处理,实现了各个子带波形的解耦,并仿真验证其性能。仿真结果表明:在AWGN信道下,F-OFDM系统的下行基...在对传统LTE-OFDM深入研究的基础上,针对滤波OFDM(F-OFDM)技术特点,设计了数据帧格式,建立F-OFDM基带系统模型,通过对2个子带进行滤波处理,实现了各个子带波形的解耦,并仿真验证其性能。仿真结果表明:在AWGN信道下,F-OFDM系统的下行基带信号的带外衰减超过60 d B,较LTE-OFDM高28 d B,F-OFDM与LTE-OFDM的BER接近一致,与理论值的差异小于1 d B。相比LTE-OFDM系统,F-OFDM系统在保证误码率性能的前提下,大大改善了带外频谱泄漏,并进一步提高了频谱效率。展开更多
针对战术通信中OFDM宽带系统存在严重的带内干扰的问题,提出了基于OFDMFH自适应的抗干扰方法。结合OFDM系统和跳频系统的抗干扰特性,针对每个子信道进行信道质量探测,由探测结果自适应地改变跳频图案和子载波的资源分配,从而有效躲避干...针对战术通信中OFDM宽带系统存在严重的带内干扰的问题,提出了基于OFDMFH自适应的抗干扰方法。结合OFDM系统和跳频系统的抗干扰特性,针对每个子信道进行信道质量探测,由探测结果自适应地改变跳频图案和子载波的资源分配,从而有效躲避干扰,增强系统抗干扰的健壮性。仿真结果表明:OFDM-FH自适应系统在不同干扰源下较OFDM-FH系统有1~3 d B的误码性能提升,较OFDM系统有3~7 d B的误码性能提升。展开更多
To achieve virtual full-duplex(VFD)communication using half-duplex radios,the rapid on-off-division(RODD)technique has been proposed in recent years.The time-hopping(TH)sequence is critical to controlling self-interfe...To achieve virtual full-duplex(VFD)communication using half-duplex radios,the rapid on-off-division(RODD)technique has been proposed in recent years.The time-hopping(TH)sequence is critical to controlling self-interference introduced in the paradigm.By constructing the collision model with a symbol level time scale,the periodic collision correlation function properties are introduced as the performance metric for the TH sequence in the RODD system.To achieve the best VFD performance,an optimization-based method for TH sequence design is proposed.In addition,the conventional TH frame structure design for RODD system is improved.Numerical simulations are presented to demonstrate that the proposed approach can significantly increase system performance.Results indicate that the TH sequence design is very effective for the RODD system.展开更多
文摘在对传统LTE-OFDM深入研究的基础上,针对滤波OFDM(F-OFDM)技术特点,设计了数据帧格式,建立F-OFDM基带系统模型,通过对2个子带进行滤波处理,实现了各个子带波形的解耦,并仿真验证其性能。仿真结果表明:在AWGN信道下,F-OFDM系统的下行基带信号的带外衰减超过60 d B,较LTE-OFDM高28 d B,F-OFDM与LTE-OFDM的BER接近一致,与理论值的差异小于1 d B。相比LTE-OFDM系统,F-OFDM系统在保证误码率性能的前提下,大大改善了带外频谱泄漏,并进一步提高了频谱效率。
文摘针对战术通信中OFDM宽带系统存在严重的带内干扰的问题,提出了基于OFDMFH自适应的抗干扰方法。结合OFDM系统和跳频系统的抗干扰特性,针对每个子信道进行信道质量探测,由探测结果自适应地改变跳频图案和子载波的资源分配,从而有效躲避干扰,增强系统抗干扰的健壮性。仿真结果表明:OFDM-FH自适应系统在不同干扰源下较OFDM-FH系统有1~3 d B的误码性能提升,较OFDM系统有3~7 d B的误码性能提升。
基金Supported by the National Key Basic Research Program of China(973 Program)(613314)
文摘To achieve virtual full-duplex(VFD)communication using half-duplex radios,the rapid on-off-division(RODD)technique has been proposed in recent years.The time-hopping(TH)sequence is critical to controlling self-interference introduced in the paradigm.By constructing the collision model with a symbol level time scale,the periodic collision correlation function properties are introduced as the performance metric for the TH sequence in the RODD system.To achieve the best VFD performance,an optimization-based method for TH sequence design is proposed.In addition,the conventional TH frame structure design for RODD system is improved.Numerical simulations are presented to demonstrate that the proposed approach can significantly increase system performance.Results indicate that the TH sequence design is very effective for the RODD system.
