WCDMA下行信道的时隙同步及频偏补偿算法研究

WCDMA作为成熟的移动通信技术衍生出多种类似的通信系统。为改善低信噪比及大频偏环境下的系统时隙同步性能。分析基于传统分段非相干累加方法在该环境下的应用局限性，使用一种基于频偏补偿与时隙同步相结合的增强时隙同步算法，仿真证明该算法可以有效提高系统的时隙同步性能。并提出基于变补偿频率步长与相干累加时隙长度相结合的频偏精补偿方案，仿真证明在低信噪比下可快速使频偏范围收敛至6Hz以内。对实际空口采集数据进行处理，验证完成了小区搜索的过程。

WCDMA Downlink Slot synchronization and Frequency offset compensation algorithm research

As a mature mobile communication technology, WCDMA derived a variety of similar communication system . In order to improve the performance of time slot synchronization under the environment of low signal-to-noise ratio and large deviation , analysis the limitations of the application of the methods that based on piece-wise non-coherent accumulation. use an Enhanced algorithm slot synchronization algorithm that based on Frequency compensation combined with slot synchronization , simulation show that this algorithm can effectively improve the slot synchronization performance of the system . and puts forward a scheme based on variable compensation frequency step size combined with variable length of coherent accumulation slot ,which can make fast convergence to 6 Hz frequency offset range Under the low signal-to-noise ratio. It succeed to deal with the process of cell search of the actual air interface data.