ijf

IJF coding refers to converting digital baseband signal into Intersymbol Interference and Jitter Free baseband signal.

IJF编码是将数字基带信号变换成无符号间干扰和抖动的基带波形信号。

IJF-OQPSK is actually to modulate the IJF codes by the Offset Quadrature Phase Shift Keying.

IJF&OQPSK实际上是对IJF信号再进行正交四相相移键控的调制技术。

In MSK modulation, due to the discontinuous slope during the switch time of the phasic path, the dropping velocity of the modulation spectrum is affected, and IJF-OQPSK is introduced to solve the limitation, smooth the phasic path and improve the spectrum.

MSK调制技术中，由于其相位路径在转换时刻的斜率不连续，影响了已调信号频谱的衰减速度，针对这一缺陷引入IJF-OQPSK，使得相位路径平滑，频谱特性有所提高。

By the pre-election wave function, simulation and digital hardware circuit has been done to realize the IJF coding.

我们采用数字硬件电路，利用预选波形函数法实现了对原始数据的IJF编码。

Simulation results show that with the non-linear constant phase path, spectral spreading has been resisted and the envelope fluctuation has been reduced by using the new IJF signals on the phase modulation technologies.

仿真结果表明：将其应用于相位调制技术后，相位路径非线性平滑连续，有效降低了调制起伏幅度，抑制了频谱扩展。

Simulation results show that compare to the rise cosine pulse, with the narrow main valve and the faster high frequency rolling and the better resisting of spectral spreading, the new type IJF code has better performance.

仿真结果表明：与传统的升余弦脉冲比较，新设计的IJF码型性能更加优越，表现为主瓣窄，高频滚降快，有效地抑制了频谱扩展。

An implementation scheme of IJF coding based on FPGA is proposed, which has the features of highly integration, flexible configuration, stable performance.

提出一种基于FPGA的IJF数字基带编码实现方案，具有高度集成、占用资源少、配置灵活、性能稳定的特点。

Especially we have researched the IJF-OQPSK modulation technique, and the performance of its inter-symbol interference and time jitter free, and its strongly resisting of spectral spreading.

特别研究了IJF&OQPSK在消除码间干扰和定时抖动方面的性能及其优良的旁瓣特性和抑制频谱扩展特性。

IJF-OQPSK is an important modern digital modulation technique.

OQPSK是一种重要的现代数字恒包络调制技术.

A new type of IJF pulse which has fine performance, low envelope fluctuation is presented.

提出一种性能优越 、 幅度起伏小、可移植性好的改进IJF码型.