Joint pilot assisted and despread soft-output carrier synchronization for the burst DSSS system

Current carrier synchronization algorithms at extremely low signal to noise ratios (SNRs) for burst direct sequence spread spectrum communication systems are not very good at achieving a high estimation precision and wide estimation range at the same time. A joint pilot assisted and despread soft-output carrier synchronization algorithm is proposed in this paper. Based on a frame structure in which the pilot symbols are separated with data symbols, a coarse frequency offset estimation is first performed based on the averaging periodogram method with the help of pilot symbols, and a coarse phase offset estimation is obtained with the maximum likelihood algorithm, and then the phase of the received signals is compensated for each segment of pilot and data symbols. Next, a fine frequency offset estimation is carried out using the despread soft output; then the fine phase offset estimation is obtained. Simulation results show that at extremely low SNRs and with a fixed number of pilots, the performance of the algorithm is near the modified Cramer-Rao bound with high frequency offset estimation precision and wide frequency offset and phase offset estimation ranges. The bit error rate of the algorithm is close to the ideal performance.     

编码辅助载波同步算法的优化设计

鉴于低信噪比下编码辅助载波同步算法存在同步范围小的问题,提出一种导频联合编码辅助载波同步算法。首先分析了导频结构对粗估计算法同步范围和同步精度的影响机理,提出适合大频偏情况的导频结构及其对应的频偏粗估计算法,并推导了它的估计方差;然后将该导频结构应用到简化的EM辅助精同步算法中,得到了同步范围大和估计精度高的导频和编码辅助的同步算法。仿真结果表明,在不损失估计精度的前提下,新算法能大幅提高同步参数的估计范围,在一定的导频长度下BER性能可逼近理想同步。     

Joint pilot and soft information assisted carrier synchronization for short burst SOQPSK signals

To solve the carrier recovery problem with large frequency offset in short burst communication systems using shaped-offset quadrature phase shift keying(SOQPSK), a joint pilot and demodulation soft information assisted carrier synchronization algorithm is proposed. First, coarse synchronization based on a few short pilot sequences is carried out. Then, further fine search is done around the coarse synchronization estimation region. The precise carrier synchronization parameters are obtained based on the maximum-mean-square soft output of SOQPSK. Simulation results show that at E_b/N₀≥0dB the proposed algorithm can eliminate large carrier offsets by as much as half the symbol rate, resist phase confusion and achieve effective carrier synchronization with 30 pilot bits and low computation complexity, achieving a BER performance which is very near the optimal coherent demodulation performance. When BER is in the region of 10^-2～10^-5, SNR degradation is below 0.3dB.     

非合作通信中MQAM的定时载波联合同步

针对非合作通信系统中多径信道下含有大符号率偏差的M进制正交振幅调制信号定时载波的同步问题,提出了一种基于改进加德纳算法的M进制正交振幅调制信号定时载波联合同步方法．该方法首先利用加德纳算法中频偏与算法输出值之间的关系,进行定时偏移估计与载波偏移粗估计;然后利用与其相差半个码元的定时误差检测输出值的绝对值差进行锁定;最后利用锁相环跟踪细微的频偏和相偏．仿真结果表明,在多径信道下,所提的定时偏移和载波偏移的联合估计方法具有良好的估计性能．     

新型的IEEE 802.11n联合符号定时同步与细频偏估计算法

在以MIMO-OFDM为基础的IEEE 802.11n无线局域网系统中,引入循环移位延时(CSD)以区分不同数据流上的数据,但也给同步带来了难题.若以训练序列与接收信号相关,造成的伪相关现象会导致定时不准,影响接收机的性能.为此,通过分析802.11n所定义的前导符号结构特点和CSD的影响,提出了新型的802.11n联合符号定时同步与细频偏估计算法.仿真结果表明,其优点是不受频偏的影响,并能较好地抑制前导符号运算中伪相关结果的产生,提高检测的准确度.     

深空通信系统中高阶LDPC码的软定时同步算法

深空通信具有信号衰减严重,接收机信噪比低的特点,针对深空通信系统中高阶LDPC码定时同步实现困难的问题,提出一种码辅助定时同步算法．首先使用高阶LDPC码的译码软信息构造一种代价函数,进行大定时偏移的粗同步,其次基于最大似然准则,使用EM算法进行定时偏移的细同步．该算法将定时同步器、解调器与译码器联合迭代,利用高阶LDPC译码器输出的软信息辅助定时同步,并通过数字插值方式对过采样信号进行补偿,从而得到接近修正克拉美罗限的定时估计．仿真结果表明,在低信噪比条件下,算法能够在较大定时偏移范围内实现有效的定时同步,并以较低的复杂度获得近似理想的系统误码率性能．     

一种适用于突发信号的载波同步算法

针对突发通信中的非数据辅助载波同步问题,提出了一种改进的差分相位频差估计算法。该算法采用DFT频差粗估计的频率搬移方法扩展了估计范围,对频移后的信号进行K阶均值滤波提高了算法的抗噪声性能,并利用高阶差分相位加权精细估计载波频偏,获得了较高的估计精度。结合二阶判决指导数字锁相环,采用联合结构实现载波相位的快速同步。文章给出了算法的实现步骤,并对其性能进行了分析。仿真结果表明,该算法计算复杂度低,估计精度高,收敛速度快,具有较高的实用价值。     

MIMO-OFDM系统中的时间和频率同步算法

文章给出了一种用于MIMO-OFDM系统的定时和频率同步算法.该算法通过在各发射天线上同时发送训练符号来实现同步.整个同步过程依次由粗定时、载波频偏估计和精定时组成.仿真结果表明所给算法在多经环境,即使低信噪比条件下仍然具有良好的性能.     

一种OFDM系统载波频率同步的改进方法

载波频率同步是OFDM系统的关键技术。对Schmid方法进行了改进,提出了利用PN序列迭代的载波频率同步方法,即将频偏估计分成粗估计和精估计两个步骤,在复杂度相同的情况下提高了频偏估计的精度和范围。     

Synchronization and channel estimation for MIMO OFDM wireless LAN systems

A new preamble structure is designed for wireless LAN based on MIMO OFDM systems, which can be used for both synchronization and channel estimation. Modulatable orthogonal polyphase sequence is utilized in training symbol design regarding its correlation properties. The time synchronization and channel estimation are achieved by measuring the correlation between the received training sequence and the locally generated training sequence. Repeated training symbols are used to get carrier frequency offset (CFO) estimation. It is shown from the analysis that the accuracy of frequency synchronization is close to the Cramér-Rao lower bound. The training sequences are optimal for channel estimation based on the minimum mean square error (MMSE).