摘要
为了论证高斯最小频移键控(GMSK)信号在时域和频域的相互关系,分析了GMSK信号调制原理和滤波器传递函数,建立了GMSK调制和解调模型。在BT=0.2、0.3、0.4时,对系统误码率进行仿真。结果表明:不同BT值的信号调制性能差别不大。随着信噪比的增大,BT=0.3与BT=0.4的系统性能基本一致。当BT=0.3时,既可以使频域带宽很窄,时域持续时间适当,又使时域信号容易实现。该研究进一步明确了高斯信号在时域、频域间的关系,为调制解调技术的深入研究奠定了基础。
The attempt to verify the interrelationship between GMSK signal in the time domain and frequency domain forces the analysis of the principle of GMSK modulation and the transfer function of the filter, and development of a model of the modulation and demodulation of GMSK signal. The error rate is simulated at BT 0. 2, 0.3 and 0. 4, respectively. The results show that different BT values show a similar performance. With the SNR increases, the performance of BT 0. 3 is more or less the same as that of BT is 0. 4. The system has a narrow band in frequency domain and has propriety last time in time domain when BT is 0. 3, and makes it easier to carry out the signal. The study gives a further definition of the relationship of Gaussian signal between the time and frequency domain, and lays foundation for the further research on the modulation and demodulation technology.
出处
《黑龙江科技学院学报》
CAS
2008年第4期299-301,305,共4页
Journal of Heilongjiang Institute of Science and Technology
