Why is cdma better than tdma

Individual conversations are encoded with a pseudo-random digital sequence scheme. The receiving equipment must be able to decode the received signal by having the ability to replicate this pseudo-random digital sequencing. The allies transmitted different parts of important information over several frequencies, instead of a single frequency, hence making it considerably more difficult for the Germans to pick up and assimilate the complete signal. Because Qualcomm, Inc.

TDMA technology divides a radio frequency into time slots and then allocates these time slots to multiple calls. In this way, a single frequency can support multiple, simultaneous data channels. The receiving equipment must be able to decode the received signal by decoding the received signal and reconstitute it using the same time slot selection algorithm as was used when it was encoded and transmitted.

All rf wireless systems produce a decreasing signal as the distance between the transmitter and the receiver increase. In the simplest model, free space, the doubling the distance reduces the received signal level by the square of the ratio of change in distance. More sophisticated propagation modeling, which is widely used in the industry, will reveal that the relationship is far more volatile than the inverse of the square of the distance.

As a result, several users are concurrently sending and receiving data. The recipient simply analyses the jumbled bits, or, to put it another way, un-randomizes them to make them intelligible.

Each slot may hold a different discussion. Because the receivers can only reassemble data sets from an emitter with the same coding, this is the case. However, there is a problem with this technique. Although the receiver receives and decodes signals with various implementations and frequencies, they begin to resurface as noise. This implies that as the overall user base grows, so does the noise exposure on any specific system. As a result, it has an impact on total coverage.

Both of them have abbreviated meanings that shed insight on the method in which they optimize channels. Skip to Main Content. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity. Use of this web site signifies your agreement to the terms and conditions. Foremost among them is the guarantee that other users will not interfere during a node's dedicated time slots.