
From:  Marcus Müller 
Subject:  Re: [Discussgnuradio] Handling of IQ files 
Date:  Sun, 20 Mar 2016 18:56:31 +0100 
Useragent:  Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 
Hi Henry, Look up the Discrete Fourier Transform in its Matrix form: You take a vector of samples and multiply it with a matrix to get the discrete Fourier transform of , which I shall denote : , with (i.e. a square matrix, representing the Npoint DFT) (i.e. column vectors). Remember how you do matrixvector multiplication: To get the result's element in its $n$th result row and the $m$th result column, you take row $n$ from the left factor (i.e. a row of $W$, which has $N$ rows, so $n\in\{1,\dots,N\}$), and multiply it pointwise with $m$th column of the right factor ($x$, which only has 1 column, so $m\equiv 1$) and calculate the sum. On 20.03.2016 17:45, Henry Barton
wrote:

[Prev in Thread]  Current Thread  [Next in Thread] 