PPSSPP Gold is a PSP game simulator, currently only a handful of games can run perfectly - APKAward.com
PPSSPP is the best, original and only PSP * emulator for Android. It runs a lot of games, but depending on the power of your device all may not run at full speed
Galaxy S7 is not currently supported, fix coming soon.
Dock your own real PSP games and turn them into .ISO or .CSO files, or simply play free homebrew games, which are available online. Put those in / PSP / GAME on your SD card / USB Storage.