基带跳频多频带OFDM超宽带系统频率同步算法

Frequency Synchronization in Baseband-Frequency-hopping Based MB-OFDM-UWB Systems

针对标准多频带正交频分复用超宽带系统,提出基于基带跳频的多频带实现方案,避免使用复杂的频率合成器,简化了硬件复杂度.研究分析基带跳频机制下频率偏差对系统的影响,进而提出基于前导训练序列的载波频率同步算法及基于频域相位均衡结合时域预修正的采样频率同步算法.仿真表明,基带跳频机制下所提出的频率同步算法性能良好,且具有较低的复杂度.

A novel multiple bands implementation scheme for the standard MB-OFDM（multi-band orthogonal frequency division multiplexing）was presented based on UWB（ultra wide band）system.It adopts baseband frequency hopping to avoid the using of complex frequency synthesizers,simplifying the hardware complexity.Under the condition of baseband frequency hopping,theoretical analysis of the effects of CFO（carrier frequency offset）and SFO（sampling frequency offset）was given on the system.Then it proposes the CFO synchronization algorithms based on the preamble training symbols and the SFO synchronization algorithms based on frequency-domain phase equalization and time-domain pre-correction.Simulation results show that the proposed frequency synchronization algorithms for baseband frequency hopping scheme have good performances and low complexity.