Hi everyone,
Interesting..seems like Digital Enhanced Cordless Technology (DECT)saga is a never ending one..frankly, I am getting little tired of this rediff article and clarifications..never mind, I will do it again..
First of all, let me start by saying that the article is one sided..I wish Rediff had given QCOM an oppurtunity to say their side of the story. Secondly, CDMA is far superior than DECT and besides all these, DECT is yet to be proven with large number of subsribers. Even though, DECT might be one of the WLL technologies out there, it has lots of underlying technical problems which makes it not a very viable option for commercial use...
Following are some of the key differences:-
1) DECT is not a mobile standard..It is a cordless standard. Which means, it will not work with mobility applications.
2) Has a very small cell radius....3.14km against 33.71km of CDMA
3) As DECT is based on TDMA standard, it does not have have frequency re-use factor of 1 as CDMA does. As a result, frequency planning is a menace...gets even worst in urban areas, taking into account the micro-cells
4) DECT requires Line-of-sight requirement, which means, antennas popping up all over building tops....an ugly scene in urban areas..
5) As DECT is based on micro-cell architecture, backhaul network is very expensive, there by increasing the cost per unit. In fact, micro-cell architecture may not be very economical in rural parts of developing countries becuase of their scattered geographical nature.
6) DECT and PHS has found applications in densely populated urban areas like Tokyo, Manila, etc. However, in dense urban environments, these technologies are limited by coverage and line of sight. This means that subscriber unit should have a direct line of sight to the BTS antenna. With many nooks and corners in downtown, the system requires many more cell sites than theoretically planned. (Urban cell radius of 560 meterÿ - practically 300 meters). As a result, one needs to acquire a cell site at every 300 meters in downtown - very painful exercise. Moreover, there is a issue of theft of these small BTSs hanging on the corners, especially in Asia. On the other hand, using multi-path CDMA handles line of sight problem very well and in fact converts into an advantage. (I got this off of a another thread. Full credit goes to that individual....However, I can not reveal his name)..
7) Currently CDMA supports data rates of upto 14.4Kbps..with emerging standards, as we all know, CDMA will be supporting much higher data rates
....and the list goes on..anyway, this should give you an idea..gotta go and work, that's all for now..
Later.. |
