$msg = $this->load->view("some_view", $data, TRUE); //$data contains the data I want to display in the table

$file_name = "Some_File_Name.xls";

header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header("Content-Type: application/force-download");
header('Content-Disposition: attachment; filename=' . $file_name);
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');

print($msg);
exit();