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Achieving high spectral efficiencies in wireless networks requires the ability to mitigate and manage the associated interference. This becomes especially important in networks where many transmitters and receivers are randomly placed, so that in the absence of coordination a particular receiver is likely to encounter significant interference from a neighboring transmitter. A challenge is then to provide a means for coordination, which allocates available resources, or Degrees of Freedom (DoFs), at each transmitter to avoid interference wherever possible. In a wireless network DoFs generally refer to non-interfering modes of transmission, and can be defined in frequency, space, and time.
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