The advantage is less computing. And reusing the downlink IFFT module can save hardware resource.

这样的好处是运算量少，而且复用了下行的IFFT模块，节省硬件资源。

In the scheme, the inverse fast Fourier trans form (IFFT) is used as a way of inverse multiplexing.

在这个方案中，IFFT的作用可以看作是反向复用。

The radix-2 decimation-in-time algorithm based on 16-bit fixed-point operation and pipeline architecture are adopted in the core module IFFT(Inverse Fast Fourier Transform).

核心模块快速傅立叶逆变换（IFFT）采用基于16位定点运算的基-2时间抽取算法和流水线结构。

The software algorithms are realized in host CPU, including channel parameters estimation, bit allocation, equalization, echo cancellation, FFT, IFFT, encoding, decoding, etc.

其中软件算法部分全部在主机CPU中实现，其中包括信道初始化，比特分配策略，符号同步，信道均衡，回波抵消，编码解码，FFT和IFFT等等。

Coupled IFFT algorithm and adaptive quadrature algorithm was employed to compute double integrals in the analytical solutions. All the subsonic, transonic and supersonic cases were computed.

然后采用IFFT算法和自适应数值积分算法计算二维积分，得到了低音速、跨音速和超音速移动荷载作用下动力响应的数值结果。