极化码作为信道编码领域的一类新型编码方案,已经被确定为5G移动通信系统中增强移动宽带(Enhanced Mobile Broadband,eMBB)场景下控制信道的编码方案。为了提高5G通信中的频带利用率和信息传输速率,提出将极化码与高阶调制技术相结合,针...极化码作为信道编码领域的一类新型编码方案,已经被确定为5G移动通信系统中增强移动宽带(Enhanced Mobile Broadband,eMBB)场景下控制信道的编码方案。为了提高5G通信中的频带利用率和信息传输速率,提出将极化码与高阶调制技术相结合,针对16QAM和256QAM两种调制方式,建立和仿真了基于极化码的高阶调制通信系统。在加性高斯白噪声(Additive White Gaussian Noise,AWGN)信道模型下采用逐次消除(Successive Cancellation,SC)译码算法对不同参数的极化码进行仿真比较。仿真结果表明,在现有5G标准控制信道的16QAM模型下,码长N=1024,码率R=1/3,信噪比Eb/N0=6 dB时,极化码误码率可以达到10^-5。未来极化码的应用将推广到数据信道,在256QAM调制方式下,也体现出较好的纠错性能;在16QAM调制方式下,将极化码与同等速率的LDPC码及卷积码相比较,性能增益也有良好的体现。展开更多
RFPA(radio frequency power amplifier)based on PWM(pulse width modulation)can be perfect linear without using complicated DPD(digital pre-distortion)hardware.However,PWM RFPA need ultra-high PWM time resolution(less th...RFPA(radio frequency power amplifier)based on PWM(pulse width modulation)can be perfect linear without using complicated DPD(digital pre-distortion)hardware.However,PWM RFPA need ultra-high PWM time resolution(less than 10 ps)for wide-band 5G,which is limited by CMOS technologies(can reach 40 ps).It limits the complexity of modulation so that PWM RFPA cannot be really commercialized so far in wideband radio/mobile technologies.This paper presents our contribution by introducing jitter into PWM.For the first time,we demonstrate that jitter can improve the PWM time resolution equivalently reaching less than 2.6 ps.Hence PWM RFPA can be used in 5G supporting 256QAM OFDM modulation based on currently available digital CMOS technologies.We demonstrate that jitter can refine the inherent resolution of PWM hardware circuit modulation.The jitter makes the MCS(modulation and coding scheme)of the bandwidth OFDM system improved from 16QAM to 256QAM in the band n28 of 3GPP 38.101.We also verified that 5G 256QAM OFDM modulation is achievable in the 3GPP band n20,Softbank band28 and NTT Docomo band28.The RMS EVM(root mean square error vector magnitude)of 256QAM OFDM modulation is about-44 dB.展开更多
文摘极化码作为信道编码领域的一类新型编码方案,已经被确定为5G移动通信系统中增强移动宽带(Enhanced Mobile Broadband,eMBB)场景下控制信道的编码方案。为了提高5G通信中的频带利用率和信息传输速率,提出将极化码与高阶调制技术相结合,针对16QAM和256QAM两种调制方式,建立和仿真了基于极化码的高阶调制通信系统。在加性高斯白噪声(Additive White Gaussian Noise,AWGN)信道模型下采用逐次消除(Successive Cancellation,SC)译码算法对不同参数的极化码进行仿真比较。仿真结果表明,在现有5G标准控制信道的16QAM模型下,码长N=1024,码率R=1/3,信噪比Eb/N0=6 dB时,极化码误码率可以达到10^-5。未来极化码的应用将推广到数据信道,在256QAM调制方式下,也体现出较好的纠错性能;在16QAM调制方式下,将极化码与同等速率的LDPC码及卷积码相比较,性能增益也有良好的体现。
基金Hainan University project funding KYQD(ZR)1974 is acknowledgedThis work is also partially supported by National Natural Science Foundation of China un-der Grant 61961014.
文摘RFPA(radio frequency power amplifier)based on PWM(pulse width modulation)can be perfect linear without using complicated DPD(digital pre-distortion)hardware.However,PWM RFPA need ultra-high PWM time resolution(less than 10 ps)for wide-band 5G,which is limited by CMOS technologies(can reach 40 ps).It limits the complexity of modulation so that PWM RFPA cannot be really commercialized so far in wideband radio/mobile technologies.This paper presents our contribution by introducing jitter into PWM.For the first time,we demonstrate that jitter can improve the PWM time resolution equivalently reaching less than 2.6 ps.Hence PWM RFPA can be used in 5G supporting 256QAM OFDM modulation based on currently available digital CMOS technologies.We demonstrate that jitter can refine the inherent resolution of PWM hardware circuit modulation.The jitter makes the MCS(modulation and coding scheme)of the bandwidth OFDM system improved from 16QAM to 256QAM in the band n28 of 3GPP 38.101.We also verified that 5G 256QAM OFDM modulation is achievable in the 3GPP band n20,Softbank band28 and NTT Docomo band28.The RMS EVM(root mean square error vector magnitude)of 256QAM OFDM modulation is about-44 dB.
