**6. References**

	- [5] Hao, M. & Wicker, S. [1995]. Performance evaluation of FSK and CPFSK optical communication systems: a stable and accurate method, *Journal of lightwave technology* (13): 1613–1623.

**Coding, Modulation, and Detection for**

**in Impulse-Radio Ultra-Wideband**

**Transmission Systems**

Andreas Schenk and Robert F.H. Fischer

http://dx.doi.org/10.5772/53261

rich multipath propagation [23].

**1. Introduction**

11, 12, 15–18].

Additional information is available at the end of the chapter

**Power-Efficient Low-Complexity Receivers**

**Chapter 5**

Impulse-radio ultra-wideband (IR-UWB) is a promising transmission scheme, especially for short-range low-data-rate communications, as, e.g., in wireless-sensor networks. One of the main reasons for this is its potential to employ noncoherent, hence low-complexity, receivers even in dense multipath propagation scenarios, where channel estimation required for coherent detection would be overly complex due to the large signal bandwidth and hence

Differential pulse-amplitude-modulated IR-UWB in combination with autocorrelation-based detection constitutes an attractive variant of noncoherent detection schemes [11]. The inherent loss in performance of traditional noncoherent autocorrelation-based differential detection (DD), as compared to coherent detection based on explicit channel estimation, can be alleviated by advanced autocorrelation-based detection schemes operating on the output of an extended autocorrelation receiver (ACR). This ACR delivers correlation coefficients of symbols separated by several symbol durations. In this context, block-based detection schemes, which partition the receive symbol stream into (possibly overlapping) blocks and thus process multiple symbols jointly, have proven to enable power-efficient, yet low-complexity detection in both uncoded and coded IR-UWB transmission systems [3, 6,

In this chapter, a comprehensive review of block-based detection schemes is presented. Starting with an exposition of the operation in uncoded schemes, we discuss the generation of soft output, required in coded IR-UWB systems employing autocorrelation-based detection. For the design of such systems, an information theoretic performance analysis of IR-UWB transmission with autocorrelation-based detection delivers design rules for coded IR-UWB systems. In particular, optimum rates for the applied channel code are derived, which improve the overall power efficiency (i.e., required signal-to-noise ratio to guarantee a desired

> ©2013 Schenk and Fischer, licensee InTech. This is an open access chapter distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0),which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly

©2013 Schenk and Fischer, licensee InTech. This is a paper distributed under the terms of the Creative Commons

Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

error rate) of the system. The chapter concludes with a brief summary.

cited.


122 Ultra-Wideband Radio Technologies for Communications, Localization and Sensor Applications **Chapter 0 Chapter 5**
