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- 2018
面向卫星高速数字通信的IQ独立处理基带结构
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Abstract:
提高卫星数字传输的速率要求增大信道带宽，需要接收端的高采样率的模数转换器支持。在极高采样率下，共模（I）、正交（Q）两路使用独立的模数转换器采样，需要分别进行基带处理。针对该应用场景，设计了一种IQ独立处理的基带结构。该结构通过重新设计辅助序列、调整处理顺序、改变处理算法等手段，使频偏估计与定时同步等处理步骤能在IQ数据上独立进行。仿真结果表明：所设计的结构传输速度快，与传统结构的误比特率性能差距在2 dB之内。
Abstract：Increased satellite digital communication rates require larger channel bandwidths which require analog-digital converters (ADCs) with higher sampling rates in the receiver. The in-phase/quadrature (IQ) data have to be sampled separately for ultra-high sampling rates, which requires IQ-separated processing. A baseband structure developed here for IQ-separated processing uses redesigned pilot arrays, an adjusted processing order and modified algorithms that gives separate frequency error estimates and timing synchronization on IQ data. Simulations show that this structure is fast with a bit-error-rate only 2 dB higher than the traditional structure.
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