Both OFDM and OFDMA are used in many modern wireless systems including AC-MIMO Radio, 802.11ac and 4G/LTE. CDMA is widely used in 3G networks. Here we give a comparison of the advantages and disadvantages of OFDMA / OFDM and CDMA is often necessary to choose the correct system.
Both CDMA and OFDM / OFDMA have their own advantages and disadvantages and therefore an OFDMA / OFDMA CDMA comparison can be beneficial.
When undertaking an OFDM CDMA comparison, or more correctly an OFDMA CDMA comparison, it is necessary to take a look at all the advantages and disadvantages. Often the OFDM CDMA choice will not be easy, but many systems these days are tending to opt for the OFDM / OFDMA solution over the CDMA solution.
OFDM OFDMA advantages and disadvantages
The tables below outline some of the advantages and disadvantages of OFDM and OFDMA. These need to be considered when looking at an OFDM CDMA comparison.
First the advantages and disadvantages of OFDM will be detailed in the table below:
It is also necessary to look at the advantages of OFDMA when undertaking an OFDM CDMA comparison.
OFDM CDMA comparison
Both OFDM and CDMA have significant benefits.
While both CDMA (DSSS) and OFMD with its variants of OFDMA and SC-FDMA have advantages, many of the systems being implemented now are erring towards the use of OFDMA. With the increase in processing power, it is possible to generate and demodulate OFDM signals with relative ease. As increasing bandwidths are needed, OFDM is being used as it is relatively easy to scale and lends itself to the high data rates being required for many applications.
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