TDD vs FDD

Dear user,

Disadvantages to FDD

The primary disadvantages of the FDD approach to microwave communication are: 

• complex to install. Any given path requires the availability of a pair of frequencies; if either frequency in the pair is unavailable, then it may not be possible to deploy the system in that band;

• radios require pre-configured channel pairs, making sparing complex;

• any traffic allocation other than a 50:50 split between transmit and receive yields inefficient use of one of the two paired frequencies, lowering spectral efficiency; and

• collocation of multiple radios is difficult. 

Disadvantages of TDD

The primary disadvantages of traditional TDD approaches to microwave communications are: 

• he switch from transmit to receive incurs a delay that causes traditional TDD systems to have greater inherent latency than FDD systems;

• traditional TDD approaches yield poor TDM performance due to latency;

• for symmetric traffic (50:50), TDD is less spectrally efficient than FDD, due to the switching time between transmit and receive; and

• multiple co-located radios may interfere with one another unless they are synchronized. 

Hope this helps. Thanks!