Abstract
Orthogonal on–off keying (O 3 K ) is a coded modulation technique, where the input digital signal is mapped into a block of orthogonal codes. The encoded data, which is in orthogonal space, modulates the laser beam by means of O 3 K . At the receiver, two photocells are cross coupled to compensate for the sunlight and other atmospheric noise. Since the laser beam is highly directional and can only be acquired by one photocell, the input laser signal can then be received with little noise, and signal processing is made easier. These techniques are especially beneficial in high bandwidth, long distance secure laser communication applications, such as for use in unmanned aerial vehicles.
Highlights
During the last two decades, there has been an explosive growth in the telecommunications industry.[1,2,3,4,5] With the addition of more and more individual computing devices, there will continue to be an exponential increase in demand, putting the existing wireless network resources under extreme pressure
Some receivers do not have any kind of filtering and use computers to sift through all the signals to receive the correct one. All of these have the effect of reducing signals from unwanted bandwidths while keeping others, and when they are placed with photodiodes, are often called “daylight” filters
O3K is a coded on–off keying modulation that utilizes a block of biorthogonal code to map a block of data.[8]
Summary
During the last two decades, there has been an explosive growth in the telecommunications industry.[1,2,3,4,5] With the addition of more and more individual computing devices, there will continue to be an exponential increase in demand, putting the existing wireless network resources under extreme pressure. Some receivers do not have any kind of filtering and use computers to sift through all the signals to receive the correct one. All of these have the effect of reducing signals from unwanted bandwidths while keeping others, and when they are placed with photodiodes, are often called “daylight” filters. None of these truly cancel out all ambient signals; they only diminish the power of the unwanted bandwidth. The detailed design and bit error performance are presented to illustrate the concept
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