1 research outputs found
Frequency-Domain Response Based Timing Synchronization: A Near Optimal Sampling Phase Criterion for TDS-OFDM
In time-domain synchronous OFDM (TDS-OFDM) system for digital television
terrestrial multimedia broadcasting (DTMB) standard, the baseband OFDM signal
is upsampled and shaping filtered by square root raised cosine (SRRC) filter
before digital-to-analog converter (DAC). Much of the work in the area of
timing synchronization for TDS-OFDM focuses on frame synchronization and
sampling clock frequency offset recovery, which does not consider the sampling
clock phase offset due to the upsampling and SRRC filter. This paper evaluates
the bit-error-rate (BER) effect of sampling clock phase offset in TDS-OFDM
system. First, we provide the BER for M-order quadrature amplitude modulation
(M-QAM) in uncoded TDS-OFDM system. Second, under the condition of the optimal
BER criterion and additive white Gaussian noise (AWGN) channel, we propose a
near optimal sampling phase estimation criterion based on frequency-domain
response. Simulations demonstrate that the proposed criterion also has good
performance in actual TDS-OFDM system with channel coding over multipath
channels, and it is superior to the conventional symbol timing recovery methods
for TDS-OFDM system.Comment: 6 pages, 7 figure