Wireless broadband provider Clearwire announced this week that it is has secured another $920 million in debt to help it finance continued construction of its 4G wireless network, which is being rolled out across the globe.

The $920 million comes from 12 percent senior secured notes, due 2015 at an issue price of 97.9 percent. This offering comes on top of another $1.85 billion in senior secured notes also due in 2015. The notes will be guaranteed by Clearwire's (NASDAQ: CLWR) wholly owned domestic subsidiaries.

Building a global network from scratch isn't cheap. All told, the $2.8 billion Clearwire has raised in recent weeks will go toward paying off an existing $1.4 billion debt payment and be used to fund continued infrastructure expansion.

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