Bandwidth efficient multiple-access (BEMA): signal design with a strict bandwidth criterion under quality-of-service constraints

Bandwidth efficient multiple access (BEMA) was previously introduced by the authors in (Varanasi and Guess 1997). BEMA results from optimizing over a class of correlated-waveform multiple access (CWMA) strategies that includes the dynamic versions of time-, frequency-, and code-division multiple-access (TDMA, FDMA, CDMA), as well identical-waveform multiple access (IWMA) as special cases. At the heart of this new BEMA strategy are signal processing algorithms that realize the functions of multiuser equalization and signal design, and which are developed by taking a new and combined approach to those two problems. This paper obtains bandwidth efficient transmitter pulses under quality-of-service (QoS) constraints for the capacity-maximizing decision feedback receiver using the strict bandwidth criterion. It complements our work in Varanasi and Guess which introduced BEMA while considering the design of transmitter pulses using the root mean square (RMS) bandwidth measure