%0 Conference Paper %B IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC) %D 2007 %T Iterative Envelope-Based SNR Estimation for Non-Constant Modulus Constellations %A R. López-Valcarce %A C. Mosquera %A Wilfried Gappmair %K EM %K SNR %K synchronization %B IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC) %G eng