NCE is the part of the FM band from 88.7 to 90.9 (I think those are the numbers). NCE means non-commercial, educational. If you think about it if you scan the FM dial, the NPRs and classical music and now a lot of Jesus stations are at that end of the dial.
Low power FM (LPFM) was introduced in the Clinton admin I think. These are small (100 watt or less) stations that cover 5 to 15 miles. Full power FM must have some space between frequencies thus limiting the amount stations. Yet many communities are way underserved because of this. They have no "local" station. On top of that with the consolidation in the industry even if a community has a radio station the station may not really serve the community. Community service was once a vital component of renewing a license with the FCC. Reagan/Bush did away with that.
So to fill the void for community stations and to get many more diverse voices on the air, LPFM was created so communities could have stations that didn't interfere with the big boys yet would allow for real community owned and run stations. This would get black, Latino, women and other seldom heard voices on the air.
But when LPFM was first allowed it was nit well advertised. There was a few real community stations applied, but mostly applications roared in from right-wing Christian groups and NPR. After sorting things out quite a few LPFMs were granted for the Christians before the FCC called a halt to the proceedings and asked congress for a better law.
Many people were not surprised that the Christians sucked up as many stations as they could. They have all that money that is brought in untaxed via churches, TV, radio and the internet. By grabbing stations they keep out competitive voices, especially liberal ones.
But why NPR? Well oddly, they were concerned about keeping competition out also.
New legislation regarding LPFM is snaking through congress. Ed Markey of Massachusetts is pushing it. Most Dems believe diverse voices are absolutely necessary for democracy.
BTW there is a great community radio station in SW Wisconsin called radio driftless. They are shooting for a full power license also.
http://www.radiodriftless.org/