Joan Erlanson

TDD may be just another three-letter acronym, but it's one with plenty of meaning. Just ask the TDD Coalition, an organization of companies sworn to support it. TDD stands for time division duplexing, and refers to a method of establishing a wireless bidirectional communications link using a single channel. According to the TDD Coalition, this capability is so important and leads to so many efficiency benefits in broadband wireless system design that its use has the potential to make or break the broadband wireless industry. Since the industry appears to be showing a break or two, this claim has attracted attention. TDD is supported by the coalition as an alternative to FDD, frequency division duplexing, which is the legacy technology. FDD requires two channels, one for upstream traffic and one for downstream traffic and a guardband between the two. As demand for spe... (more)