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Shown on this slide is a comparison of the advantages of using FHSS technology versus using modules based on the alternate technology known as direct sequence. As can be seen, the key advantage of using radio modules based on FHSS is that this technology ensures maximum resistance to multipath fading and offers robustness in the presence of interfering signals. This is a very important consideration, particularly for indoor system designs. Spread spectrum technology reduces the vulnerability of a radio system to both multipath fading and noises by distributing the transmitted signal over a larger region of the frequency band than would otherwise be necessary to send the information. This allows the signal to be reconstructed at the receiving end even though part of it may be lost or corrupted in transmission. Because it offers greater immunity to interfering signals, FHSS is often the preferred choice for co-located systems and for systems in harsh industrial environments that can be corrupted by noise, path loss and interfering transmissions from other radios.
