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首页> 外文期刊>Communications, IEEE Transactions on >Sample Rate Conversion Using B-Spline Interpolation for OFDM Based Software Defined Radios
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Sample Rate Conversion Using B-Spline Interpolation for OFDM Based Software Defined Radios

机译：基于B样条插值的采样率转换，用于基于OFDM的软件定义无线电

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摘要

This paper proposes arbitrary ratio sample rate conversion (SRC) architectures and a simpler B-spline interpolation algorithm for orthogonal frequency division multiplexing (OFDM) based software defined radios (SDRs) with multiband and multi-channel capabilities. Different from conventional standalone digital front-end designs for SDRs, the proposed SRC architectures combine the B-spline interpolation with OFDM modulation and equalization for OFDM transmitter and receiver respectively. With this combined design, the passband droop introduced by the B-spline interpolation can be more efficiently compensated using frequency-domain pre-distortion, instead of conventional time-domain pre-filtering, and hence an overall system complexity reduction is achieved. A novel multi-period B-spline interpolation and re-sampling structure is then constructed, and an interpolation algorithm with lower implementation complexity than that of the conventional Farrow structure is further developed. The SRC performance is also analysed by deriving the signal-to-peak distortion ratio formulas which can be used as design tools for determining the required orders of B-splines in the OFDM transmitter and receiver respectively. Finally, SRC examples used in a high-speed multiband multi-channel microwave backhaul system are given and compared with conventional polyphase filterbank interpolation to demonstrate the practicality and performance of the proposed SRC architectures and interpolation algorithm.
机译：本文针对具有多频带和多信道功能的基于正交频分复用（OFDM）的软件定义无线电（SDR），提出了任意比率采样率转换（SRC）体系结构和一种更简单的B样条插值算法。与用于SDR的常规独立数字前端设计不同，所提出的SRC体系结构将B样条插值与OFDM调制和均衡分别结合用于OFDM发送器和接收器。利用这种组合设计，可以使用频域预失真而不是常规的时域预滤波来更有效地补偿由B样条插值法引入的通带下垂，从而实现了总体系统复杂度的降低。然后构造了一种新颖的多周期B样条插值和重采样结构，并进一步开发了一种实现复杂度比常规Farrow结构低的插值算法。还可以通过推导信噪比公式来分析SRC性能，该公式可用作设计工具，分别确定OFDM发送器和接收器中B样条的所需阶数。最后，给出了在高速多频带多信道微波回程系统中使用的SRC示例，并将其与常规的多相滤波器组插值进行比较，以证明所提出的SRC体系结构和插值算法的实用性和性能。

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