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首页> 外文期刊>Annales des Telecommunications >An efficient channelizer tree for portable software defined radios
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An efficient channelizer tree for portable software defined radios

机译：便携式软件定义的无线电的高效信道器树

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Power consumption is one of the most critical issues in the portable software-defined radio devices. A software radio receiver has the need to downconvert, bandwidth limit, and downsample a single narrowband channel from a span of frequencies in the Nyquist zone collected by the input analog to digital converter. In this paper, we present two techniques that perform the receiver function more efficiently than the standard Gray chip architecture formed by its direct digital synthesizer (DDS), and two stages of downsampling with a cascade integrator comb (CIC) filter and a pair of half-band filters. We compare the workload of this conventional architecture to two new architectures by applying them to the task of extracting a single, 30 kHz wide, channel from a 30 MHz band sampled at 90 MHz. One proposed structure replaces the CIC filter with a 10-stage cascade of 2-to-1 downsampling half-band filters with successively narrower transition bandwidths. In the second proposed structure, the DDS is moved to the output of the filtering stages which perform a sequence of 2-to-1 downsampling operations in half-band filters that perform incidental spectral translation by aliasing. We enlarge the set of half-band filter that reside at 0 and fs/2, to also include the Hilbert transform half-band filters residing at ±fs/4. At every stage in the cascade, the selected band resides in one of the four half-band filters. The 2-to-1 downsampling with that filter reduces the bandwidth and aliases the desired center through a sequence of known center frequencies. The desired channel is recovered from the output of the final stage by a complex heterodyne applied (at the low output rate) to obtain the desired spectral shift to base band. The paper provides a detailed workload analysis of the proposed structure along with simulation results that prove its effectiveness.
机译：功耗是便携式软件定义的无线电设备中最关键的问题之一。软件无线电接收机需要从输入模数转换器收集的奈奎斯特区域中的频率跨度下变频，带宽限制和下采样单个窄带信道。在本文中，我们介绍了两种技术，它们比直接数字合成器（DDS）形成的标准Gray芯片体系结构更有效地执行接收器功能，以及采用级联积分梳状（CIC）滤波器和一对半对滤波器进行的两个下采样阶段带滤波器。通过将它们应用于从90 MHz采样的30 MHz频带中提取单个30 k​​Hz宽的信道的任务，我们将这种常规架构的工作负载与两种新架构进行了比较。一种提出的结构用具有逐步变窄的过渡带宽的10级级的2到1下采样半带滤波器代替了CIC滤波器。在第二个提出的结构中，DDS移至滤波级的输出，该滤波级在半带滤波器中执行2对1降采样操作序列，该半带滤波器通过混叠执行偶然的频谱转换。我们扩大了位于0和fs / 2的半带滤波器的集合，以包括位于±fs / 4的希尔伯特变换半带滤波器。在级联的每个阶段，所选频带位于四个半带滤波器之一中。使用该滤波器的2比1下采样会减少带宽，并通过一系列已知的中心频率来给所需的中心混叠。通过应用复数外差（以低输出速率）从最终级的输出中恢复所需的通道，以获得所需的向基带的频谱偏移。本文对拟议结构进行了详细的工作量分析，并通过仿真结果证明了其有效性。

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