Research Article
A novel algorithm for blind adaptive recognition between 8-PSK and π/4-shifted QPSK modulated signals for software defined radio applications
@INPROCEEDINGS{10.1109/CROWNCOM.2009.5189385, author={Ali Abavisani and Mohammad Soleimani and Vahid Tabatabavakili}, title={A novel algorithm for blind adaptive recognition between 8-PSK and π/4-shifted QPSK modulated signals for software defined radio applications}, proceedings={4th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications}, publisher={IEEE}, proceedings_a={CROWNCOM}, year={2009}, month={8}, keywords={Automatic Blind Modulation Recognition (ABMR); Mean Square Error (MSE); Constant Modulus Algorithm (CMA); Tapped Delay Line filter (TDL); software defined radio (SDR); relative Euclidean distance; relative phase difference}, doi={10.1109/CROWNCOM.2009.5189385} }- Ali Abavisani
Mohammad Soleimani
Vahid Tabatabavakili
Year: 2009
A novel algorithm for blind adaptive recognition between 8-PSK and π/4-shifted QPSK modulated signals for software defined radio applications
CROWNCOM
IEEE
DOI: 10.1109/CROWNCOM.2009.5189385
Abstract
In this paper, we propose a new method to recognizing and distinguishing among 8-PSK modulated signal and pi/4-shifted QPSK, from the samples of received noisy and faded PSK signal. The proposed algorithm is based on computation of relative Euclidean distance and relative phase difference among the received symbols in a frame. Prior to recognition, the constant modulus (CM) equalization is performed. Based on simulation results, this method can perform recognition task with high accuracy even at low signal to noise ratio (SNR) values and employing fairly small number of data samples. To the best of our knowledge in comparison with other methods of distinguishing among QPSK variants, this algorithm do well specially in practical systems which have a limited time to make the decision and use small number of samples of receiving signal.
