3 problems

Let a signature matrix determine a bit-error rate (BER) and a channel capacity for an overloaded CDMA system. BER–capacity monotonicity conjecture. The lower the BER of a signature…

Let $\tilde{u}_{\mathrm{un}}(x)$ be the non-uniform stationary solution described above for the spatially coupled system. Instability conjecture. We conjecture that…

Let a CDMA system use chip waveforms processed by a linear minimum mean-square-error (MMSE) multiuser detector. Sinc-pulse optimality conjecture. Sinc pulses are optimal for CDMA s…