维度 1 固定在左侧，但在右侧变化（Matlab 中的 [84480 x 1]

Question

我需要更正这段代码，上面写着“维度 1 固定在左侧，但在右侧有所不同（[84480 x 1]...”

我正在尝试使用定点转换器来转换此代码。但是，对于 rxWaveform，这个维度 1 的错误是固定在左侧的……

rxWaveform = rxWaveform(1+offset:end,:);

function rxWaveform = new_synch(rxWaveform,pssRef)

%PSSIndices = ltePSSIndices(enb);         % getting PSS indexes
%pssGrid = lteDLResourceGrid(enb);       % generate empty sub frame for PSS symbols
%pssGrid(PSSIndices) = ltePSS(enb);      % map PSS symbols into the subframe
%pssRef = lteOFDMModulate(enb,pssGrid); % generate PSS reference signal via LTE OFDM

% getting the lenghts of the received waveform and PSS reference signal

rxSize = size(rxWaveform,1);
pssSize = size(pssRef,1);

% performing correlation between received waveform and pss symbols
pssCorr = xcorr(rxWaveform,pssRef);  

% segmenting resultant vector to identify the first local maximum
pssCorr = pssCorr(rxSize - pssSize:rxSize + pssSize,:);

% extract the index of first local maximum, M is not useful here, just for
% the output result 
[M,index] = max((abs(pssCorr)));

%calculating offset using local maximum
offset = index - pssSize -1;  % subtracted from 1 due to shift in the 



rxWaveform = rxWaveform(1+offset:end,:);





end

Answer 1

这里有两种可能的情况，但第二种情况更有意义

案例1：只更新原始数组的一部分并返回整个数组rxWaveform

替换 rxWaveform = rxWaveform(1+offset:end,:);
为此 rxWaveform(1+offset:end,:) = rxWaveform(1+offset:end,:);

• rxWaveform 大小比方说是90000 by 1
• rxWaveform(1+offset:end,:) 大小为 84480 by 1

显然这两个维度是不同的
您正在做的是更新原始rxWaveform的一部分@
因此，您还需要指定新部分位置，即左侧的(1+offset:end,:)

---

案例2：只返回原始数组的一部分rxWaveform(1+offset:end,:)

如果您只想返回部分而不是整个rxWaveform，只需更改函数输出名称，它不应该是rxWaveform，但它可以是任何变量名称，比如'output'

代码如下

function output = new_synch(rxWaveform,pssRef)

%PSSIndices = ltePSSIndices(enb);         % getting PSS indexes
%pssGrid = lteDLResourceGrid(enb);       % generate empty sub frame for PSS symbols
%pssGrid(PSSIndices) = ltePSS(enb);      % map PSS symbols into the subframe
%pssRef = lteOFDMModulate(enb,pssGrid); % generate PSS reference signal via LTE OFDM

% getting the lenghts of the received waveform and PSS reference signal

rxSize = size(rxWaveform,1);
pssSize = size(pssRef,1);

% performing correlation between received waveform and pss symbols
pssCorr = xcorr(rxWaveform,pssRef);  

% segmenting resultant vector to identify the first local maximum
pssCorr = pssCorr(rxSize - pssSize:rxSize + pssSize,:);

% extract the index of first local maximum, M is not useful here, just for
% the output result 
[M,index] = max((abs(pssCorr)));

%calculating offset using local maximum
offset = index - pssSize -1;  % subtracted from 1 due to shift in the 



output = rxWaveform(1+offset:end,:);





end