Marina del Rey

Comcast Corp. said Tuesday that its investment in a joint venture to offer mobile Internet access to subscribers could be finalized by the end of the year.

Steve Burke, president of Philadelphia-based Comcast, said the new service would let cable companies offer "wireless data speeds that Verizon and AT&T can't match."

Comcast, the nation's largest cable TV operator, in May joined Time Warner Cable Inc., Intel Corp., Google Inc., Sprint Nextel Corp., Clearwire Corp. and other partners to form a $14.55 billion communications company that will offer high-speed mobile Internet access.