DSSS (Direct Sequence Spread Spectrum):

In case of interference or collision between the narrow band signals in ISM Spectrum “Spread Spectrum” is used to elevate coexistence for the fair apportioning of the ISM Spectrum. The overlapping may sometimes results in the loss of data or packets. 

Multiple Accesses to a single channel is possible by “CDMA (Code Division Multiple Access)”.

DSSS is the proficiency used by 802.15.4 that applies “Chipping Sequence” produced by a pseudo – random code, which is then transmitted at an uttermost rate named as Chip rate. It has the functionality to directly tone the carrier signal – hence the name “Direct sequence” which is further used to encode the transmitting data.

This paper is written and submitted by sandeep k