Feedforward Amplifiers for Wideband Communication Systems by Jon Legarda

By Jon Legarda

This booklet has been attainable because of the study conducted within the box of the linearization options utilized to electronic verbal exchange structures, relatively to these with excessive spectral effective modulation innovations. It merges within the want of constructing frequency effective modulations with common codification suggestions. The publication places into perform the Feedforward linearization method, aimed toward enhancing both the linearity or potency parameters of energy amplifiers.

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On the I/Q diagram (Figure 1-18) the I component has only two different values, so the symbol rate is one bit per symbol. Figure 1-19. Phase shift keying (PSK) A more common phase modulation is the quadrature phase shift keying (QPSK). It is used extensively in applications like CDMA (code division multiple access) cellular services, wireless local loops, Iridium and DVB-S (digital video broadcasting-satellite). Two I values and two Q values are possible, so four states can be formed. Since 4 = 22, the symbol rate is the half of the bit rate.

57). 57) The measurement of the I2T distance is carried out with two signal generators and a spectrum analyzer, as indicated in Figure 2-15. The input signal power must be properly adjusted in order to guarantee the quasilinear performance: a +1dB input signal must correspond with a +1dB in the output main signal and with a +2dB in the third order intermodulation products. The Figure 2-16 is the display of the spectrum analyzer during the I2T measurement. 2. Nonlinear distortion 45 RF signal generator Freq f 1 MHz Amp 5dBm RF OUT 50 Ω Spectrum analyzer dB/div Σ DUT RF IN 50 Ω Variable attenuator Freq f2 MHz Amp 5dBm RF OUT 50Ω RF signal generator Figure 2-15.

In any digital modulation system, if the input signal is distorted or severely attenuated, the receiver will eventually lose the symbol lock completely and it will not be able to demodulate the signal or recover any information. If the distortion or attenuation effects are moderate, the symbol clock will be recovered but the reception quality will be noisy. In some cases, a symbol will fall far away from its intended position and it will cross over to an adjacent position. The I/Q level detectors would misinterpret such symbol as being in the wrong location, causing undesired bit errors.

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