I am a real “techie”, are their any technical advantages of mobile 802.16e over fixed 802.16d?
Yes, there are advantages of mobile 16e over 16d fixed. Here is a partial list: • Scalable FFT: in 802.16e, the FFT size scales with bandwidth, improving efficiency. 802.16d has a fixed FFT size. • Subchannelization: 16e optionally offers special subchannelization which can provide marked improvements, especially in the UL. (OFDM/802.16d does offer subchannelization but far less complex) When subchannelization is implemented, more transmit power can be allocated to a user with less favorable channel conditions within the same time slot, while lowering the power for users in better locations. There is also a scheduling advantage with 802.16e subchannelization. In an OFDM/802.16d system, only one user can be scheduled per symbol as opposed to OFDMA/802.16e where multiple users can be scheduled per symbol. • Power Reduction: Though this is probably not hypercritical for WISPs, yet it is an advantage. 16e introduced sleep and idle modes which reduce power when the airlink is not being used
