波峰因数减少(Crest Factor Reduction)IP

专为异构网络(HetNet)小型蜂窝和低功耗无线应用而优化

波峰因子减少(CFR)选择性地降低宽带数字信号的峰均比(PAR),用于例如3G码分多址(CDMA)或长期演进(LTE)无线应用。

CFR Diagram

莱迪思的峰值对消波峰因子减少(PC-CFR)IP核包含在专为HetNet应用而优化的 数字前端(DFE)IP套件中。该IP核高度可编程并且可以进行定制,以达到所需的资源与性能比。IP核专为用于ECP3 FPGA系列而优化,实现了LTE信号的PAR值降低多达4dB。

欲了解更多有关CFR IP的信息,请点击下面的“START HERE”按钮。

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特性

  • 莱迪思PC-CFR IP支持1到4根天线
  • 内核的时钟采样比可以配置为1、2或4
  • 提供1、2或3个连续的检测和消除阶段来限制峰值
  • 消除脉冲可能是实数或复数
  • 脉冲系数可以在生成时通过系数文件预先配置,或在操作过程中通过Wishbone接口配置
  • 每个阶段滤波器可独立配置检测的目标峰值阈值和消除脉冲系数
  • 每个阶段滤波器的限幅引擎的数量可独立配置
  • 最大的消除脉冲长度是可配置的
  • IP提供并行或TDM(时分复用)正交(I & Q)的输入/输出模式
  • 可配置的数据宽度
  • 可配置的系数宽度
  • 输入/输出增益选择

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框图

Performance and Size

ECP51
User-Configurable Mode Data Width Coefficient Width Highspeed Mode Registers LUT4s Slices EBR MULT 18x18 fMAX (MHz)
1 Antenna, 1 Stage, 8 Clip engines 18 18 true 2988 2704 2193 5 10 223
1 Antenna, 2 Stage, 10 Clip engines 18 18 true 4672 4537 3535 7 14 223
1 Antenna, 3 Stage, 14 Clip engines 18 18 true 6800 6658 5166 10 20 223

1. Performance and utilization data are generated targeting a LFE5UM-85F-8MG756C device using Lattice Diamond 3.2 and Synplify Pro I- 2013.09L software. Performance may vary when using a different software version or targeting a different device density or speed grade within the ECP5 family.

LatticeECP31
User-Configurable Mode Data Width Coefficient Width Highspeed Mode Registers LUT4s Slices EBR MULT 18x18 fMAX (MHz)
1 Antenna, 1 Stage, 8 Clip engines 18 18 false 2750 2643 2029 5 18 259
1 Antenna, 2 Stage, 10 Clip engines 18 18 false 4321 4493 3313 7 24 263
1 Antenna, 3 Stage, 14 Clip engines 18 18 false 6338 6599 4870 10 34 266

1. Performance and utilization data are generated targeting a LFE3-70EA-9FN672C device using Lattice Diamond 3.2 and Synplify Pro I- 2013.09L software. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeECP3 family.

文档

快速参考
标题 编号 版本 日期 格式 文件大小
CFR IP User Guide
IPUG109 1.1 6/1/2014 PDF 3.8 MB
DFE Demo User's Guide
UG68 1.0 9/1/2013 PDF 2.2 MB


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