No need for signaling: investigation of capacity and quality of service for multi-code CDMA systems using the WBE++ approach

Next generation mobile communication systems will not be voice dominated. A large set of applications with different quality of service requirements will run on top of the wireless end-system. The quality of service support for different types of services over the wireless link poses formidable challenges to the protocol design. To guarantee a fast return of investment for network providers, the capacity per wireless cell has to be maximized. We introduce a new approach for designing spreading sequences for synchronous CDMA systems; it achieves high capacity and avoids overwhelming signaling. By means of simulation, we show that our approach leads to a significant capacity improvement. Moreover, higher quality of service values can be achieved using a recently introduced protocol.