A nonvolatile semiconductor memory device having a first circuit for selecting one from a plurality of blocks, the first circuit having a plurality of transistors connected to word lines connected to some of the nonvolatile memory cells, and a second circuit for generating a first voltage V1, a second voltage V2 and a third voltage V3. The changer generally includes a seat having a supply assembly positioned on one side and a takeup assembly provided on the opposite side. As such, the request is accepted with higher probability. Described herein is a throughput versus SINR result and a corresponding technique for jointly choosing a transmission rate and multiuser detection algorithm that allows computationally constrained cognitive DSA nodes high rate operation in spectrum black space.