LGC Wireless, a San Jose company that helps strengthen cellular signals for mobile phones in places like bunkered buildings and airports, has acquired the cellular unit of Tel Aviv company Alvarion.

The price was $15 million in convertible notes. LGC has been around for a decade, and it is unclear how well the company is doing. It has raised $93 million in backing from multiple investors including Rembrandt Venture Partners, Allegis Capital, Crystal Ventures, Dali Hook Partners, Intel Capital, Hutchison Whampoa, LG Ventures, and Mayfield.

The Alvarion cellular unit pulled in approximately $21 million in revenue during the first three quarters of 2006, Alvarion said.