残留频偏下
LDPC-MSK
系统码辅助载波同步算法
赵旦峰
;
周相超
;
钱晋希
;
付芳
【期刊名称】
《系统工程与电子技术》
【年
(
卷
),
期】
2012(034)009
【摘要】
Regarding
the
carrier
synchronization
difficulty
of
low
density
parity check code-minimum shift keying (LDPC-MSK) systems existed at
low
signal-to-noise
ratios
(SNR),
a
new
code-aided
carrier
synchronization algorithm is proposed. The soft decoding information is
utilized
to
coarse
synchronization
based
on
cost
function
and
fine
synchronization
based
on
maximum
likelihood
(ML)
criterion.
The
reliable
carrier
synchronization
is
achieved
by
conducting
the
joint
iteration of synchronizer, demodulator and decoder. Both the theoretical
studies
and
the
simulation
results
show
that,
at
the
low
SNR,
the
efficient
carrier
synchronization
can
be
achieved
with
large
frequency
and phase offset. Almost ideal performance is obtained with rather low
system
complexity.%
针对低信噪比条件下低密度奇偶校验码
-
最小频移键控系
统载波同步实现困难的问题
,
提出了一种新的码辅助载波同步算法
.
该算法将译码
软信息分别运用到基于代价函数的载波粗同步和基于最大似然迭代的载波细同
步之中
,
将同步器、解调器与译码器联合迭代
,
从而实现较理想的载波同步
.
理论
研究和仿真结果表明
,
在低信噪比条件下
,
该算法能够在大频偏、大相偏范围内实
现有效的载波同步
,
并以较低系统复杂度的代价
,
获得近似理想的系统性能
.
【总页数】
6
页
(1900-1905)