基于OFDM-OQAM系统的信道估计

show text in black screen with different size :)

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输入一个自然数Ｎ（2≤N≤9），要求输出如下的螺旋矩阵，即边长为N*N，元素取值为1至N*N，1在左上角，呈顺时针方向依次放置各元素。 N=3时，相应的矩阵中每个数字位置如下图所示： 1 2 3 8 9 4 7 6 5-Enter a natural number N (2 ≤ N ≤ 9), the requirements are as follows spiral output matrix, that is, edge length of N* N, the element values for the 1 to N* N, 1 in the upper left corner, showing a clockwise direction in order to place the various elements . N = 3, the corresponding figures for the location of each matrix as follows: 123,894,765

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第27集 驱动SD卡实验 sd卡的两种模式，SDIO模式、SPI模式。 sdio速度快，然而使用此模式增加生产成本； SPI则通用，一般情况下使用SPI模式。

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西门子TC35短信模块开打算打算 发资料-13123123

自己做的课程设计，手机资费管理系统，计费，账单查询，通话记录查询，模拟发短信，打电话等功能都实现了。-Make their own curriculum design, mobile phone tariff management system, billing, billing inquiries, call history query, analog send text messages, phone calls and other functions are realized.

cambridge book: mathematic methods for physics and engineering, 3rd edition.

用于定时删除指定目录下的前几天文件-used regularly to delete the specified directory paper a few days ago