The chairman of Clearwire's board of directors will resign his position today, according to a filing with the Securities and Exchange Commission.

Craig McCaw, who served as chairman for two years, did not resign over any disagreements with the company or over any matters pertaining to the company's operations or practices, according to the filing.

The company, which has visions of being a major player in the 4G wireless space, has been adding subscribers at a rapid clip as the WiMax technology has rolled out into cities. But the company has also hit a cash crunch and, last month, said it will have to cut its workforce by 15 percent, trim its marketing spending, and delay plans for launches in other cities.

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