Transceiver Design for Multiband OFDM UWB
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Transceiver Design for Multiband OFDM UWB D. M. W. Leenaerts Philips Research, 5656 AE, Eindhoven, The Netherlands Received 14 October 2005; Accepted 9 January 2006 Ultra-wideband (UWB) is an emerging broadband wireless technology enabling data rates up to 480 Mbps. This paper provides an overview of recent design approaches for several circuit functions that are required for the implementation of multiband OFDM UWB transceivers. A number of transceiver and synthesizer architectures that have been proposed in literature will be reviewed. Although the technology focus will be on CMOS, also some design techniques implemented in BiCMOS technologies will be presented. Copyright © 2006 D. M. W. Leenaerts. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
1.
INTRODUCTION
Short-range communication systems (so-called wireless personal area network (WPAN) systems) with ranges of up to 10 m are becoming popular in replacing cables and in enabling new consumer applications. Examples such as Bluetooth and ZigBee, which operate in the 2.4 GHz ISM band, have however a limited data rate, typically about 1 Mbps, which is insufficient for many applications like fast transfer of large files (e.g., wireless USB) and high-quality video streaming. In order to increase the data rate to several hundreds of Mbps, a higher bandwidth is preferred over a larger SNR. This became possible at the moment the FCC released spectrum for UWB in the US spanning from 3.1 to 10.6 GHz with an average transmit power level of only −41.3 dBm/MHz [1, 2]. Several proposals have since then been presented to realize a short-range high data rate communication link. At present, both direct-sequence impulse communication and multiband OFDM UWB systems are under consideration as a standard. The standard proposed by the multiband OFDM alliance (MBOA) is based on subdivision of the large available bandwidth in subbands of 528 MHz (see Figure 1) [2]. The data is QPSK-OFDM modulated on 128 subcarriers. Various modes are defined with data rates up to 480 Mbps. In the mandatory mode of operation (Mode 1), a frequency-hopping scheme in the three lower bands is implemented. Using only the three lower bands allows the use of a bandpass prefilter to reduce the interferer level of the 5 GHz ISM band. After each symbol period of 312.5 ns, a 9.5 ns guard time is available for hopping to the next band.
This paper intends to give an overview of the current status in multiband OFDM-based UWB systems. Section 2 will discuss the most important system specifications. Section 3 will highlight the progress made on receiver building blocks and Section 4 will focus on transmitter building blocks. Various design aspects on the synthesizer will be discussed in Section 5. Several (fully) integrated transceivers will be discussed in Section 6 and finally some concluding remarks are stated in Section 7. Although the emphasis of t
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