Final answer:
The statement that Time Division Multiplexing is more efficient than Frequency Division Multiplexing because guardbands are not needed is not universally true.
The efficiency of each method depends on the specific conditions and requirements of the communication system. Both TDM and FDM have their advantages and disadvantages and are chosen based on the application's needs.
Step-by-step explanation:
The statement posed by the student is not necessarily true. Time Division Multiplexing (TDM) and Frequency Division Multiplexing (FDM) are both methods used to multiplex multiple signals over a single communication channel.
The efficiency of TDM versus FDM depends on various factors, including the nature of the communication channel and the type of data being transmitted.
With TDM, multiple signals share the same channel by dividing the channel into consecutive time slices. Each signal is transmitted in its respective time slot, so there's no need for guardbands which are used in FDM to prevent interference between frequency bands.
However, TDM can be less efficient if the allocated time slots are not fully utilized. On the other hand, FDM allocates different frequency bands to different signals and uses guardbands to prevent overlapping of signals, which can lead to a waste of bandwidth. In certain scenarios, such as in analog systems or when signals have a narrow bandwidth requirement, FDM might be more efficient.
Therefore, it's not accurate to universally declare that TDM is more efficient than FDM merely because of the absence of guardbands. The choice between TDM and FDM is situational and depends on the specific requirements of the communication system.