|
|
This is only a preview of the paper
Click here to register and get the full text.
Existing members click here to login
|
|
|
... Care should be taken to get an understanding of whether the figure being quoted is a raw (or burst) rate capability of the radio, or is the true size of the “data pipeline” being offered to the user. The following issues should be addressed:
a. Converting a digital stream into a form the radio can use up some of the raw capacity (i. ... For example, a radio with a digital output port rated at 16 Kbps would have to talk to some modem feeding it the correct signal structure (say, conditioned diphase, as in TRI-TAC, or NRZ, as in digital message devices). ... Bit rate quality of radio links are very low compared to landline (cable) runs, requiring some form of error checking algorithm. ... Capacity is rigorously considered to be for a single frequency (or net, if the radio frequency-hops). ... This does not increase the capacity of a single radio or single net. ... The capacity of a single radio is determined by (1) the data rate available to the connected user terminal (see discussion on modem overhead in para (a); (2) the modulation rate/bandwidth of the RF, channel coming out of the radio, less any overheads such as FEC ATR; (3) the duty cycle of the radio itself (typically transmitting no more than 50% of the available time; and (,4) the duplex scheme of the desired link (i. ... Again, several issues need to be addressed:
a. ... (This is easier to do with a network protocol which is deterministic, such as TDMA systems, than a demand access type system such as packet radio/overlay. ... No electromagnetic radiation (whether it be radio or optical) actually “goes through” vegetation. ... It is also advisable that radio communications be able to support connectivity for users on-the-move. ... Radio features that give them some advantages sometimes are drawbacks for other concerns:
a. ... Network Issues, and Traffic Control - Any time more than one party/node wants to use the shared media, there needs to be a method of controlling how that is to be achieved. ... , a telephone line, a combat net radio), the human users themselves, or some net master station will handle this, normally quite adequately. ... These different techniques have various strengths and weaknesses and, so, must be considered within the constraints of the total system design. ... , MSE and EPLRS employ flood routing during network set-up; Packet Radio reverts to flooding if the path-set-up routing fails.
Approximate Word count = 2061
Approximate Pages = 8.2
(250 words per page double spaced)
|
|
|
|
|
|