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1. 发明公开

EP1443640A1 Reference oscillator phase noise compensation circuitry 审中-公开
标题翻译： Schaltung zum Phasenrauschkompensieren eines参考文献
公开(公告)号：EP1443640A1
公开(公告)日：2004-08-04
申请号：EP03425048.0
申请日：2003-01-29
申请人： Siemens Mobile Communications S.p.A.
发明人： Colosimo, Aurelio
IPC分类号： H03B1/04
CPC分类号： H03B1/04
摘要： A phase noise compensation circuitry is connectible to a reference oscillator (14) which generates a reference signal, affected by phase noise ϕ( t ), exploitable either for modulation, demodulation, or simply frequency conversion. The compensation circuitry includes an mixer (17) which receives the reference signal, and a copy of the reference signal after π/2 phase shifting and delaying by a fixed delay τ spanning an integer number N of periods of the reference signal. The baseband signal at the output of the mixer (17) is proportional to the time derivative of the phase noise voltage. In a preferred embodiment the baseband signal is filtered and A/D converted before reaching a downstream numerical integrator (21) which provides a phase noise estimation voltage proportional to the difference between the phase noise voltage across the delay τ. The delay τ also spans an integer L N periods of the digital clock: L =1 is the preferred value. The output of the integrator (21), opportunely scaled out, acts as an address ϕ of two look-up tables (23, 24) for obtaining in correspondence respective digital samples sin (ϕ) and cos ( ϕ ). These digital samples are sent to a complex multiplier (11) which carries out the following digital products: ( r )=[ s I ( r )· cos ϕ] and ( r )=[ s Q ( r )· sin ϕ], in order to perform a digital compensation of the phase noise due to the reference signal. In case the compensation circuit is used by the transmitter the ( r ), ( r ) products are In-phase and In-quadrature phase-noise precompensated modulating components. In case the compensation circuit is used by the receiver the ( r ), ( r ) products are In-phase and In-quadrature phase-noise postcompensated demodulated components (fig.2).
摘要翻译：相位噪声补偿电路可连接到参考振荡器（14），其产生受相位噪声φ（t）影响的参考信号，可用于调制，解调或简单的频率转换。补偿电路包括接收参考信号的混频器（17）和在pi / 2相移之后的参考信号的副本以及跨越参考信号的整数N个周期的固定延迟τ的延迟。混频器（17）的输出端的基带信号与相位噪声电压的时间导数成比例。在优选实施例中，在到达下游数字积分器（21）之前对基带信号进行滤波和A / D转换，该下行数字积分器提供与跨越延迟τ的相位噪声电压之间的差成比例的相位噪声估计电压。延迟τ还跨越数字时钟的整数L

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