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Abstract This system presents an multipath delay commutator (MDC)-based architecture and memory scheduling to implement fast Fourier transform (FFT) processors for multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) systems with variable length. Based on the MDC architecture, we propose to use radix-Ns butterflies at each stage; whereNs is the number of data streams, so that there is only one butterfly needed in each stage. Consequently, a 100% utilization rate in computational elements is achieved. Moreover, thanks to the simple control mechanism of the MDC, we propose simple memory scheduling methods for input data and output bit/set reversing, which again results in a full utilization rate in memory usage. Since the memory requirements usually dominate the die area of FFT/inverse fast Fourier transform (IFFT) processors, the proposed scheme can effectively reduce the memory size and thus the die area as well.
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MDC FFT/IFFT Processor With Variable Length for MIMO-
OFDM Systems
Abstract
This system presents an multipath delay commutator (MDC)-based architecture
and memory scheduling to implement fast Fourier transform (FFT) processors for
multiple input multiple output-orthogonal frequency division multiplexing (MIMO-
OFDM) systems with variable length. Based on the MDC architecture, we propose to
use radix-Ns butterflies at each stage; whereNs is the number of data streams, so that
there is only one butterfly needed in each stage. Consequently, a 100% utilization rate in
computational elements is achieved. Moreover, thanks to the simple control mechanism
of the MDC, we propose simple memory scheduling methods for input data and output
bit/set reversing, which again results in a full utilization rate in memory usage. Since
the memory requirements usually dominate the die area of FFT/inverse fast Fourier
transform (IFFT) processors, the proposed scheme can effectively reduce the memory
size and thus the die area as well. Furthermore, to apply the proposed scheme in
practical applications, we let Ns =4 and implement a 4-stream FFT/IFFT processor with
variable length including 2048, 1024, 512, and 128 for MIMO-OFDM systems. This
processor can be used in IEEE 802.16 WiMAX and 3GPP long term evolution
applications. The processor was implemented with an UMC 90-nm CMOS technology
with a core area of 3.1 mm 2 .The power consumption at 40 MHz was
3.72/62.92/57.51/51.69 mW for 2048/1024/512/128-FFT, respectively in the post-layout
simulation. Finally, we analyze the complexity and performance of the implemented
processor and compare it with other processors. The results show advantages of the
proposed scheme in terms of area and power consumption.
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0th Review 1st Review
Abstract Existing System Disadvantages Proposed System Advantages Objective System Requirements System Architecture
Literature Survey Module List Module Description Data Flow Diagram Level DFD Module Wise DFD Problem Definition Review Document Explanation
2nd Review 3rd Review
Use case Diagram Class Diagram Collaboration Diagram Sequence Diagram Activity Diagram Testing & test cases Partial Code Screenshot for First two
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