In order to compensate for the deficiency of Sine Pulse Width Modulation（SPWM）, on the base of analyzing the principle of space w tot pulse width modulation and being compared with SPWM, the method of solving workin...In order to compensate for the deficiency of Sine Pulse Width Modulation（SPWM）, on the base of analyzing the principle of space w tot pulse width modulation and being compared with SPWM, the method of solving working time of adjacent vector and the method of generate space voltage vector were introduced. The experiment to the inverter which consists of IGBT proves that SVPWM centrol algorithm can reduce harmonic effectively, it is beneficial to enhancing the utilization rate of voltage source inverter direct current power supply.展开更多
低密度奇偶校验(Low-Density Parity-Check,LDPC)码是第五代移动通信技术(5th Generation Mobile Communication Technology,5G)系统采用的信道编码技术之一,用于业务信道高速数据传输,具有很强的抗干扰能力和纠错能力。5G-LDPC码编译...低密度奇偶校验(Low-Density Parity-Check,LDPC)码是第五代移动通信技术(5th Generation Mobile Communication Technology,5G)系统采用的信道编码技术之一,用于业务信道高速数据传输,具有很强的抗干扰能力和纠错能力。5G-LDPC码编译码在嵌入式平台的实现是一个值得关注的研究方向。CEVA-XC4500数字信号处理(Digital Signal Processing,DSP)芯片具有极低功耗、高密度计算、集成了超长指令字(Very Long Instruction Word,VLIW)和单指令多数据(Single Instruction Multiple Data,SIMD)矢量功能的特点。针对CEVA-XC4500 DSP矢量汇编指令和内联指令集的特点,提出一系列针对5G-LDPC码编码的代码优化方法,使其满足5G-LDPC码编码工程应用指标要求。仿真结果表明,优化后的5G-LDPC码编码在CEVA-XC4500 DSP内核上表现良好,中长块编码吞吐率超过100 Mb/s、核心矩阵吞吐率超过1 Gb/s,最大吞吐率达到250 Mb/s、最大核心矩阵吞吐率达到1.6 Gb/s。如果CEVA-XC4500 DSP芯片的最大数据位宽将来能进一步增大,吞吐率可以做得更好。该5G-LDPC码编码的代码优化方法为其他信道编码在类似嵌入式平台的实现提供了参考。展开更多
文摘In order to compensate for the deficiency of Sine Pulse Width Modulation（SPWM）, on the base of analyzing the principle of space w tot pulse width modulation and being compared with SPWM, the method of solving working time of adjacent vector and the method of generate space voltage vector were introduced. The experiment to the inverter which consists of IGBT proves that SVPWM centrol algorithm can reduce harmonic effectively, it is beneficial to enhancing the utilization rate of voltage source inverter direct current power supply.
