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In this paper a VLSI design of a MIMO-OFDM system is presented. The authors start with the design of an OFDM physical layer that follows the IEEE standard 802.11a. They then devise an efficient pipelined architecture, and incorporate it into the MIMO-OFDM physical layer. In their experiments, they compare their pipelined architecture to the baseline MIMO-OFDM physical layer implementation. The baseline MIMO-OFDM system uses the same number of Fast Fourier Transform (FFT) blocks as antennas. The implementation efficiency of their pipelined architecture, compared with the baseline MIMO-OFDM system, is evaluated using two methods: using just one FFT block and using Radix-2 pipelined streaming FFT block, versus a Radix-4 FFT block used in the baseline MIMOOFDM system.
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