Default values for the optimization algorithm. More...
Detailed Description
IQ balance utils implementation.
The actual algorithm used for estimation of the imbalance and its optimization is inspired by the IQ balancer of SDR# by Youssef Touil and described here :
The convolution of discrete sequences is defined as :
Altough the mathematical operation is commutative, the constraint of implementation limit this method. Depending on the type of span chosen, it might not be and it's always recommended that 'g' be the longer sequence. It should not be much of a limitation when this methos is used for filtering or pulseshaping : use 'f' as the filter and 'g' as the signal.
The output vector parameter 'out' can be NULL to allocate a new vector. If it's not NULL, it must be long enough to contain the result (length depends on the exact convolution type)
The cross-correlation of discrete sequences is defined as :
In this implementation, the output vector will be for every n value between 0 and (g->len - f->len + 1). This assumes that g is the longer sequence and we 'fit' f at every positition inside it.
With the parameter g_corr_step, it's also possible to have a g sequence that is oversampled with regard to f. (if g_corr_step > 1)
The output vector parameter 'out' can be NULL to allocate a new vector. If it's not NULL, it must be long enough to contain the result (i.e. g->len - f->len + 1)
Fractionally delay a vector while maintaining its length.
Parameters
[in]
in
Input complex vector
[in]
delay
The fractional delay to apply
[out]
out
Output complex vector
Returns
The output complex vector (or NULL if error)
The output always has the same length. Samples pushed out by the delays are lost and new ones filled with zeroes are pushed in.
The output vector parameter 'out' can be NULL to allocate a new vector, or can be equal to the 'in' input vector to perform the transform in-place. If it's different, it must be long enough to contain the result (i.e. in->len)
The output vector parameter 'out' can be NULL to allocate a new vector, or can be equal to the 'in' input vector to perform the transform in-place. If it's different, it must be long enough to contain the result (i.e. in->len)
The output vector parameter 'out' can be NULL to allocate a new vector, or can be equal to the 'in' input vector to perform the transform in-place. If it's different, it must be long enough to contain the result (i.e. in->len)
'Normalize' an IQ signal and apply decimation/frequency shift
Parameters
[in]
sig
Input complex signal
[in]
decim
Decimation factor
[in]
freq_shift
Frequency shift in radian per output sample
[out]
out
Output complex vector
Returns
The output complex vector (or NULL if error)
The operation performed are DC removal, amplitude normalization (divided by the standard deviation), decimation, frequency shift.
The output vector parameter 'out' can be NULL to allocate a new vector, or can be equal to the 'in' input vector to perform the transform in-place. If it's different, it must be long enough to contain the result (i.e. (sig->len + decim - 1) / decim)
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libosmodsp: include/osmocom/dsp/cfile.h File Reference
Objectively estimate IQ balance in a given complex buffer.
Parameters
[in]
data
Input complex buffer (at least fft_size * fft_count samples)
[in]
fft_size
Size of the FFT to use internally
[in]
fft_count
The number of consecutive FFT to use internally
[out]
state_p
Cache object for multiple calls (can be NULL)
Returns
A number >= 0.0f estimating the IQ balance (the lower, the better)
The Cache object should only be used for multiple calls with the same parameters and the same size of input vector. Once you don't plan on using it anymore, you should call _osmo_iqbal_estimate_release . The initial pointer value should also be initialized to NULL.
The mag and phase parameters are pointers to float. If in the options, the 'start_at_prev' is enabled, the initial values of those will be used and so they should be initialized appropriately.
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rowMatchName.substr(0, search.length)==search)
{
row.style.display = 'block';
matches++;
}
else
{
row.style.display = 'none';
}
}
i++;
}
document.getElementById("Searching").style.display='none';
if (matches == 0) // no results
{
document.getElementById("NoMatches").style.display='block';
}
else // at least one result
{
document.getElementById("NoMatches").style.display='none';
}
this.lastMatchCount = matches;
return true;
}
// return the first item with index index or higher that is visible
this.NavNext = function(index)
{
var focusItem;
while (1)
{
var focusName = 'Item'+index;
focusItem = document.getElementById(focusName);
if (focusItem && focusItem.parentNode.parentNode.style.display=='block')
{
break;
}
else if (!focusItem) // last element
{
break;
}
focusItem=null;
index++;
}
return focusItem;
}
this.NavPrev = function(index)
{
var focusItem;
while (1)
{
var focusName = 'Item'+index;
focusItem = document.getElementById(focusName);
if (focusItem && focusItem.parentNode.parentNode.style.display=='block')
{
break;
}
else if (!focusItem) // last element
{
break;
}
focusItem=null;
index--;
}
return focusItem;
}
this.ProcessKeys = function(e)
{
if (e.type == "keydown")
{
this.repeatOn = false;
this.lastKey = e.keyCode;
}
else if (e.type == "keypress")
{
if (!this.repeatOn)
{
if (this.lastKey) this.repeatOn = true;
return false; // ignore first keypress after keydown
}
}
else if (e.type == "keyup")
{
this.lastKey = 0;
this.repeatOn = false;
}
return this.lastKey!=0;
}
this.Nav = function(evt,itemIndex)
{
var e = (evt) ? evt : window.event; // for IE
if (e.keyCode==13) return true;
if (!this.ProcessKeys(e)) return false;
if (this.lastKey==38) // Up
{
var newIndex = itemIndex-1;
var focusItem = this.NavPrev(newIndex);
if (focusItem)
{
var child = this.FindChildElement(focusItem.parentNode.parentNode.id);
if (child && child.style.display == 'block') // children visible
{
var n=0;
var tmpElem;
while (1) // search for last child
{
tmpElem = document.getElementById('Item'+newIndex+'_c'+n);
if (tmpElem)
{
focusItem = tmpElem;
}
else // found it!
{
break;
}
n++;
}
}
}
if (focusItem)
{
focusItem.focus();
}
else // return focus to search field
{
parent.document.getElementById("MSearchField").focus();
}
}
else if (this.lastKey==40) // Down
{
var newIndex = itemIndex+1;
var focusItem;
var item = document.getElementById('Item'+itemIndex);
var elem = this.FindChildElement(item.parentNode.parentNode.id);
if (elem && elem.style.display == 'block') // children visible
{
focusItem = document.getElementById('Item'+itemIndex+'_c0');
}
if (!focusItem) focusItem = this.NavNext(newIndex);
if (focusItem) focusItem.focus();
}
else if (this.lastKey==39) // Right
{
var item = document.getElementById('Item'+itemIndex);
var elem = this.FindChildElement(item.parentNode.parentNode.id);
if (elem) elem.style.display = 'block';
}
else if (this.lastKey==37) // Left
{
var item = document.getElementById('Item'+itemIndex);
var elem = this.FindChildElement(item.parentNode.parentNode.id);
if (elem) elem.style.display = 'none';
}
else if (this.lastKey==27) // Escape
{
parent.searchBox.CloseResultsWindow();
parent.document.getElementById("MSearchField").focus();
}
else if (this.lastKey==13) // Enter
{
return true;
}
return false;
}
this.NavChild = function(evt,itemIndex,childIndex)
{
var e = (evt) ? evt : window.event; // for IE
if (e.keyCode==13) return true;
if (!this.ProcessKeys(e)) return false;
if (this.lastKey==38) // Up
{
if (childIndex>0)
{
var newIndex = childIndex-1;
document.getElementById('Item'+itemIndex+'_c'+newIndex).focus();
}
else // already at first child, jump to parent
{
document.getElementById('Item'+itemIndex).focus();
}
}
else if (this.lastKey==40) // Down
{
var newIndex = childIndex+1;
var elem = document.getElementById('Item'+itemIndex+'_c'+newIndex);
if (!elem) // last child, jump to parent next parent
{
elem = this.NavNext(itemIndex+1);
}
if (elem)
{
elem.focus();
}
}
else if (this.lastKey==27) // Escape
{
parent.searchBox.CloseResultsWindow();
parent.document.getElementById("MSearchField").focus();
}
else if (this.lastKey==13) // Enter
{
return true;
}
return false;
}
}
function setKeyActions(elem,action)
{
elem.setAttribute('onkeydown',action);
elem.setAttribute('onkeypress',action);
elem.setAttribute('onkeyup',action);
}
function setClassAttr(elem,attr)
{
elem.setAttribute('class',attr);
elem.setAttribute('className',attr);
}
function createResults()
{
var results = document.getElementById("SRResults");
for (var e=0; e
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}
function showSyncOn(n,relpath)
{
n.html('
');
}
function toggleSyncButton(relpath)
{
var navSync = $('#nav-sync');
if (navSync.hasClass('sync')) {
navSync.removeClass('sync');
showSyncOff(navSync,relpath);
storeLink(stripPath2(pathName())+hashUrl());
} else {
navSync.addClass('sync');
showSyncOn(navSync,relpath);
deleteLink();
}
}
var loadTriggered = false;
var readyTriggered = false;
var loadObject,loadToRoot,loadUrl,loadRelPath;
$(window).on('load',function(){
if (readyTriggered) { // ready first
navTo(loadObject,loadToRoot,loadUrl,loadRelPath);
showRoot();
}
loadTriggered=true;
});
function initNavTree(toroot,relpath)
{
var o = new Object();
o.toroot = toroot;
o.node = new Object();
o.node.li = document.getElementById("nav-tree-contents");
o.node.childrenData = NAVTREE;
o.node.children = new Array();
o.node.childrenUL = document.createElement("ul");
o.node.getChildrenUL = function() { return o.node.childrenUL; };
o.node.li.appendChild(o.node.childrenUL);
o.node.depth = 0;
o.node.relpath = relpath;
o.node.expanded = false;
o.node.isLast = true;
o.node.plus_img = document.createElement("span");
o.node.plus_img.className = 'arrow';
o.node.plus_img.innerHTML = arrowRight;
if (localStorageSupported()) {
var navSync = $('#nav-sync');
if (cachedLink()) {
showSyncOff(navSync,relpath);
navSync.removeClass('sync');
} else {
showSyncOn(navSync,relpath);
}
navSync.click(function(){ toggleSyncButton(relpath); });
}
if (loadTriggered) { // load before ready
navTo(o,toroot,hashUrl(),relpath);
showRoot();
} else { // ready before load
loadObject = o;
loadToRoot = toroot;
loadUrl = hashUrl();
loadRelPath = relpath;
readyTriggered=true;
}
$(window).bind('hashchange', function(){
if (window.location.hash && window.location.hash.length>1){
var a;
if ($(location).attr('hash')){
var clslink=stripPath(pathName())+':'+hashValue();
a=$('.item a[class$="'+clslink.replace(/