The best replacement for baseband is broadband.

The best alternatives to baseband are rated as following:
★★★★★  broadband
★★★  broadband transmission
★★  firmware
★★  rf
★★  passband
★★  modem
★  bandpass
  modem firmware
  diphase
  application processor
  intermediate frequency
  broadband ethernet

Your alternative for baseband is not listed? Suggest!
Speaking about baseband, one probably shouldn't forget about ios 6.

Other search terms related to baseband and their ratings are:
★★★★★ ios 6
★★★★ redsnow
★★★★ custom ipsw
★★★★ redsn0w
★★★ 4.3.3
★★★ 4.2.1
★★ restore
★★ snowbreeze
★★ firmware
★★ ipsw
★ updating firmware
sn0wbreeze
ios 4.2.1
You have in mind a companion for baseband and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of baseband in all years. Click on graph for more.
baseband
broadband
broadband transmission