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Receiver

Module by: Brian Viel. E-mail the author

Decoding the Transmission

Since the receiver has full knowledge of all the steps taken to transmit, the reception process is the exact inverse of transmission. The only difference is the addition of the channel equalization described in the previous part. To get back the information we originally sent, we simply:

  • Take the FFT of the reception and divide it by the FFT of the impulse response. Then iFFT it back.
  • Remove the cyclic prefix
  • Take the Fourier Transform
  • Demirror the vector
  • Approximate each received value to nearest point in constellation and map them back to the original bit sequences. See figure below for example in 4 bit approximation.
  • Convert the binary series back to ascii letter equivalents.
Figure 1: The map on the left was approximated to the one on the right with a 2.15% percent error.
Approximation of Constellation Map
constellation.

Please see the block diagram below. It summarizes the reception process.

Figure 2: This diagram shows the all of the components and flow of our receiver system.
Receive Block Diagram
Receive block diagram.

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Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

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