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This paper presents a first order Takagi-Sugeno-Kang (TSK) type fuzzy equalizer to mitigate nonlinear power amplifier distortion effects from the received signal in orthogonal frequency division multiplexing (OFDM) systems. Here we propose a Comprehensive Learning Particle Swarm Optimizer (CLPSO) based structure identification of the TSK equalizer. CLPSO uses a new learning strategy that achieves...
Traditional OFDM based transmission system uses Cyclic Prefix (CP) in an OFDM symbol in order to maintain orthogonality of transmission. Present days' Ultra-Wideband (UWB) systems use Multi-Band OFDM (MB-OFDM) techniques for transmission in application like Wireless Personal Area Network (WPAN). UWB based systems are power limited by the regulation of FCC. CP introduces correlation in the transmitted...
Overloaded Code Division Multiple Access (CDMA) system accommodates more number of users than the spreading factor, N. One of the efficient scheme to overload a CDMA system is to use two sets of orthogonal signal waveforms (O/O). The first set is assigned to the N users and the second set is assigned to the additional users. An iterative multistage detection technique is used to cancel interference...
Overloading is a technique to accommodate more users than the spreading factor N. This is a bandwidth efficient scheme to increase the number of users in a fixed bandwidth for mobile communication. One of the efficient schemes to overload a CDMA system is to use two sets of orthogonal signal waveforms (O/O). The first set is assigned to the N users and the second set is assigned to the additional...
Overloading is a technique to accommodate more number of users than the spreading factor N. This is a bandwidth efficient way to increase the number users in a fixed bandwidth. One of the efficient schemes to overload a CDMA system is to use two sets of orthogonal signal waveforms (O/O). The first set is assigned to the N users and the second set is assigned to the additional users. An iterative multistage...
In this work, we study the effect of frequency dependent IQ mismatch (TX and RX) for a wideband OFDM system. We develop a joint channel response and IQ mismatch estimation scheme that can implicitly take care of frequency dependent IQ mismatch occurring at both TX and RX. We also propose a modified frequency domain equalizer structure that can work with the above estimates to efficiently remove the...
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