Pulse Position Pre-Coding Exploiting UWB Power Constraints


Florian Trösch, Frank Althaus, and Armin Wittneben


6th IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2005, New York, June 2005.

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Due to dense multipath channels, coherent receivers in Ultra-Wideband Impulse Radio (UWB-IR) technology are high in hardware complexity and power consumption. This makes coherent receivers in downlink transmission of Low Data Rate (LDR) applications, where a more complex node communicates with many basic sensors, unreasonable. Pre-coding schemes are known solutions to transfer receiver complexity to transmitter side, while maintaining receiver performance. We sketch performance and scalability potential of pre-coding schemes in LDR systems in presence of drastic Federal Communications Commission's (FCC) power constraints. This is done by Symbol Error Rate (SER) analysis of an easily realizable Pulse Position Pre-coding (PPP) scheme, supported by simulation results over measured UWB channels. Under realistic conditions, PPP gains up to 9dB are demonstrated, and it is shown that already a few PPP pulses are sufficient to significantly reduce receiver complexity, at the expense of more transmit power.


UWB, Impulse Radio, Pulse Position Precoding, Pulse Position Modulation, Low Data Rate, Senor Networks, Scalability

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