By Mohamed K. Nezami
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Com RF Architectures and Digital Signal Processing Aspects of Digital Wireless Transceivers The principle of I/Q imbalances estimation and correction in Figure 1-24 is based on the orthogonality between the I and Q signals. Since the imaginary and real parts of a perfectly balanced MPSK modulated signal are orthogonal, if there are any quadrature imbalances, this orthogonality is distorted. Based on this principle, a simple approach is to estimate amplitude mismatches from the autocorrelation function of the imaginary and real parts of the modulated Mary-PSK signal, as shown in Figure 1-24.
42dB. One method to compensate for this distortion is the inverse sin(x)/x equalizer [15]. 85Mhz}. In this chapter we have surveyed in detail most of the RF subcomponents used in various topologies of radio design. Next we will examine the radio receiver digital baseband section, where demodulation and decoding take place. Dr. com RF Architectures and Digital Signal Processing Aspects of Digital Wireless Transceivers DAC/LPF fTX 1 LO-3 90 0 PA 0 PA 0 PA DAC/LPF fTX 2 LO-2 90 DAC/LPF Channel Combineer Wideband Matrix of multi user data DAC/LPF DAC/LPF fTX LO-N 90 DAC/LPF Figure 1- 34: Conventional semi digital multicarrier transmitter architecture Dr.
19. com 20. Mohamed K. Nezami, “Performance Assessment of Baseband Algorithms for Direct Conversion Tactical Software Defined Receivers: I/Q Imbalance Correction, Image Rejection, DC Removal, and Channelization,”, IEEE Milcom Conf. , Nov. 2002. com 42 RF Architectures and Digital Signal Processing Aspects of Digital Wireless Transceivers Chapter 2 Introduction to Coherent Demodulation Wireless receivers process signals that bear information as well as disturbances caused by the transmitter/receiver circuits and channel impairments such as fading, interference, and additive white Gaussian noise (AWGN).