Programmable OFDM Receiver Architecture
Date Issued
2001-07-31
Date
2001-07-31
Author(s)
DOI
892213E002120
Abstract
Residual intersymbol interference (ISI) and
large peak-to-average (PAP) power ratio are two
well-known problems in orthogonal frequency
division multiplexing (OFDM) systems. We
propose an approach named “multi-carrier
parallel decision feedback decoder” (MC-PDFD)
based on the concept of “reduced state sequence
estimation” (RSSE) to combine trellis-code
modulation (TCM) and decision feedback
equalization (DFE) in OFDM systems. The
excellent performance of MC-PDFD to remove
residual ISI is convinced by several simulation
results with different number of subcarriers,
channel conditions, and trellis-coded modulation
techniques. In addition, the related parameters
that affect the value of PAP ratio are defined and
the proper upper and lower bounds for different
trellis-coded modulation schemes are derived to
investigate the reduction of PAP. Furthermore, to
explore the feasibility of OFDM systems and the
concept of software radio, we design and
implement two transceivers based on the EVM
board with TI’s TMS320C6201 DSP to
constitute an integrated rate-adaptive OFDM
communication system with software radio
architecture. This programmable architecture
shall provide a flexible implementation platform
for future developments of advanced OFDM
systems.
Subjects
OFDM
residual ISI
PAP
TCM
multi-dimensional TCM
DFE
multipath fading
rate-adaptive
coding
synchronization
equalization
Publisher
臺北市：國立臺灣大學電信工程學研究所
Type
report
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