The seventh International Workshop on Signal Design and its Applications in Communications (IWSDA’15) will be held at Bengaluru, India, from September 13 –18, 2015. The IWSDA workshop series dates back to September 2001 in Chengdu, China, and since 2005 has been held every 2 years in Yamaguchi, Japan, Chengdu, China, Fukuoka, Japan, Guilin China, and Tokyo, Japan, respectively. The aim of the workshop series is to foster fruitful interactions among signal designers, coding theorists, cryptographic researchers and communications practitioners from all over the world. A special feature of this particular workshop is a session that will celebrate the 60th birthday of P. Vijay Kumar.