title: Improved Noncoherent UWB Receiver for Implantable Biomedical Devices.
abstract: The purpose of this paper is to describe a novel noncoherent receiver architecture to improve the error performance of impulse-radio ultrawideband (IR-UWB) in bioimplanted devices. IR-UWB receivers based on energy detection are popular in biomedical applications owing to the low implementation cost/complexity and the high data rates that UWB can potentially support. Implanted devices suffer from severe frequency-dependent attenuation due to human blood and tissues, while most receivers in the literature are designed based on commonly used indoor wireless channel models.
  
  
  
  We propose a novel receiver design that is based on judiciously combining the energies in different bands of the signal spectrum with a weighted linear combiner. We derive the optimum coefficients of the combiner.
  
  
  
  The receiver retains almost all of the advantages of a conventional noncoherent detector, but can also compensate for attenuation properties of blood/tissue. The receiver design can be adapted to different implantation depths by simply varying the combiner weights. The receiver can also be considered to be a simple form of equalizer for noncoherent reception. Our simulations show about 2-dB improvement over other commonly used receivers.
  
  
  
  This receiver design is significant in that it can enhance critical battery life of implanted transmitters.
authors: Santosh
authors: S
authors: Nagaraj
authors: Faris G
authors: FG
authors: Rassam
mesh_terms: D003198:Computer Simulation; D006801:Humans; D008962:Models, Theoretical; D019736:Prostheses and Implants; D011474:Prosthesis Design; D011846:Radio Waves; D012815:Signal Processing, Computer-Assisted; D059015:Wireless Technology / Q000295:instrumentation*