BER of differentially detected π/4 DQPSK in the presence of quadrature gain imbalance. - Maxime Scarpa; Julia Vogel; John T. Stonick; Sayfe Kiaei (WCNC, 1999)

Performance of differentially detected π/4 DQPSK in the presence of IQ phase imbalance. - Maxime Scarpa; Julia Vogel; John T. Stonick; Sayfe Kiaei (ISCAS, 2000)