摘要
针对突发模式下的GMSK信号,设计并实现了一种非相干数字化接收机,并且提出了一种更容易硬件实现而且频谱更好的GMSK信号产生方式。该接收机为了降低系统的复杂度,接收机采用2bit差分的方式按样点先进行信号解调,然后利用提出的基于引导码的位定时算法,在8个符号之内实现了位定时的快速捕获。最后在FPGA上的实现证明了接收机的可行性和优越性。
The paper designs and realizes a non-coherent digitized GMSK receiver, and proposes a new generation method of GMSK signals with better spectrum characteristic which is more easy to realize on FPGA. Additionally, in order to reduce the complexity of the receiver, the received signals are demodulated sample by sample in advance and then decided with the estimated symbol timing. The symbol timing acquisition algorithm proposed is realized based on a preamble sequence rapidly within only 8 symbols. At last the integrated realization on FPGA of this receiver proves its feasibility and superiority.
出处
《无线电工程》
2008年第3期58-60,共3页
Radio Engineering
关键词
GMSK
非相干接收机
差分解调
码元定时捕获
GMSK
non-coherent receiver
differential demodulation
symbol timing acquisition
