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A DSP Implementation of OFDM A
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2010-07-01
赵辉
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ABSTRACT
The success of multicarrier modulation in the form of OFDM in
radio channels illuminates a path one could take towards high-rate
underwater acoustic communications, and recently there are inten-
sive investigations on underwater OFDM. In this paper, we imple-
ment the acoustic OFDM transmitter and receiver design of [4, 5]
on a TMS320C6713 DSP board. We analyze the workload and
identify the most time-consuming operations. Based on the work-
load analysis, we tune the algorithms and optimize the code to sub-
stantially reduce the synchronization time to 0.2 seconds and the
processing time of one OFDM block to 1.7 seconds on a DSP pro-
cessor at 225 MHz. This experimentation provides guidelines on
our future work to reduce the per-block processing time to be less
than the block duration of . seconds for real time operations.
The success of multicarrier modulation in the form of OFDM in
radio channels illuminates a path one could take towards high-rate
underwater acoustic communications, and recently there are inten-
sive investigations on underwater OFDM. In this paper, we imple-
ment the acoustic OFDM transmitter and receiver design of [4, 5]
on a TMS320C6713 DSP board. We analyze the workload and
identify the most time-consuming operations. Based on the work-
load analysis, we tune the algorithms and optimize the code to sub-
stantially reduce the synchronization time to 0.2 seconds and the
processing time of one OFDM block to 1.7 seconds on a DSP pro-
cessor at 225 MHz. This experimentation provides guidelines on
our future work to reduce the per-block processing time to be less
than the block duration of . seconds for real time operations.
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