Sequence Design for Symbol-Asynchronous CDMA with Power or Rate Constraints

— Sequence design and resource allocation for a symbol-asynchronous chip-synchronous code division multiple access (CDMA) system is considered in this paper. A simple lower bound on the minimum sum-power required for a nonoversized system, based on the best achievable for a non-spread system, and an analogous upper bound on the sum rate are first summarised. Subsequently, an algorithm of Sundaresan and Padakandla is shown to achieve the lower bound on minimum sum power (upper bound on sum rate, respectively). Analogous to the synchronous case, by splitting oversized users in a system with processing gain N, a system with no oversized users is easily obtained, and the lower bound on sum power (upper bound on sum rate, respectively) is shown to be achieved by using N

• Type: Conference
• Year: 2007
• Where: COMSWARE
• Authors: Jyothiram Kasturi, Rajesh Sundaresan
• Keywords: COMSWARE 2007, Lower Bound, Sum Rate, Upper Bound