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Performance Analysis of Ultra-Wide Band (UWB) Communication with a Relay Node

Zeinalpour Yazdi, Zolfa | 2010

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 40811 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Nasiri Kenari, Masoumeh; Azhang, Behnaam
  7. Abstract:
  8. In recent years, there has been an increased interest on employing low-cost, high-speed, low-latency wireless links for short range communications (< 10m). Ultra-wideband (UWB) radio is a promising technology to meet this interest. However, due to the limitation on its transmitted power level, UWB system faces major challenges to achieve an adequate system performance. Therefore, it is greatly necessary to find some efficient methods to enhance the system performance. Recently, cooperative diversity has emerged as an effective scheme to overcome multipath fading and thus to improve the quality of service in the physical layer of wireless networks without increasing the transmission power of each node. In wireless networks, diversity techniques are traditionally used to improve link reliability. Diversity can be achieved in time, frequency, and space, to name a few options. In meshed communication networks, the diversity can be alternatively implemented through a cooperative transmission. In this thesis, we investigate the performance of a cooperative UWB communication with a relay node. Cooperative transmission for a UWB communication is still largely unexplored, especially for the multipath fading propagation channel. We first evaluate the bit error probability (BEP) performance of the classical TH-PPM-UWB system in a relay networks with realistic UWB links specified by the IEEE 802.15.4a standard. Then, considering the notable advantage of UWB communications, namely fine time resolvability, we use the “time reversal” technique to simplify the receiver structure. We analytically evaluate the performance of the system and show that taking the advantages of time reversal in the UWB communication with severe multipath components results in good BEP performance, while keeping the complexity of the receiver low. We also compute the BEP of the system with imperfect channel estimation which is inevitable in practical scenarios, and investigate the robustness of the considered system to the channel estimation errors. Finally, we investigate the achievable rate of the UWB communication with a relay node and compute upper and lower bounds on its expected and outage capacities. We also obtain a lower bound on the outage probability which is a more appropriate performance limit indicator, specially in slow fading channel and show that the outage probability of the UWB channel improves substantially when a relay node is present.
  9. Keywords:
  10. Relay Channel ; Outage Probability ; Ultra Wide Band (UWB)Communication ; Achievable Rate Region ; Bit Error Rate ; Time-Reversal Technique ; Institiute Electrical and Electronic Engineers (IEEE)802.15.4a Standard

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