Author(s): Weidong Xiang, University of Michigan, Dearborn
	Tutorial presented at : WCNC 2005 (IEEE Wireless Communications and Networking Conference CO-located with CTIA )
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The tutorial dedicates to the cutting-edge wireless parallel transmission technologies in frequency-domain and space-domain, known as orthogonal frequency-division multiplexing (OFDM) and multiple input multiple out (MIMO) respectively, with focuses on the implementations of OFDM MIMO high-speed wireless local area network (WLAN) and wireless metropolitan area network (WMAN) prototypes on the basis of the technology of software radio. The related technical backgrounds are briefly introduced firstly, which includes OFDM, MIMO, space-time coding, Bell laboratory layered space-time (BLAST), the IEEE 802.11a based WLAN, the IEEE 802.16 based WMAN and software radio testbed. The tutorial then discusses the implementations of a two-transmitter tow-receiver (2x2) real-time space-time coding OFDM WLAN/WMAN prototype and a four-transmitter four-receiver (4x4) OFDM BLAST WLAN/WMAN prototype. At First, we discuss the configuration of an up-to-date software radio testbed. The key algorithms implementations based on multiple TMS320C6701 DSPs are then presented, including QAM map/de-map, FFT/IFFT, time synchronization, frequency synchronization, channel estimation and compensation, and coding/decoding. The prototype realizes a 30 Mb/s wireless link based on the IEEE 802.16 standard and Alamouti’s space-time diversity scheme. Next, we present the experimental results of a four-transmitter four-receiver OFDM BLAST prototype, offering a peak date rate of 525Mb/s with a spectrum efficient of 19.2 b/Hz/s. BLAST detection algorithms, bit error rate (BER) to signal to noise ratio (SNR) curves, the impairments of carrier frequency offset, the impact on system capacity due to the degradation of MIMO channel, the error distributions and the unsymmetric MIMO configurations are discussed in details. Software radio testbed can rapidly implement and evaluate new algorithms and schemes, which benefits to both academy research and product development. This tutorial is based on our five years’ research in the software radio laboratory at Georgia Tech and offers fundamental and helpful information for development engineers, system engineers, technical managers, and graduate students who are interested in the promising wireless parallel transmission technologies.

• Total Presentation Time: 2h 35m 55s
• Total Number of Slides: 93