In this paper, a new image-reject low noise amplifier is designed for the 2.4 GHz industrial-scientific-medical (ISM)band. An inter-stage T -structure filter is used in the low noise amplifier design to provide 35-dB image rejection.The goal of this design is to merge the image-reject function into the low noise amplifier.
In this paper, we propose an efficient implementation scheme of widehand version of parallel interference cancellation (PIC) called regenerative PIC for multiuser detector with Rayleigh fading multipath channel and multiple access interference (MAl). Multiuser detection shall .be used in the receiver. The successive PIC scheme cancels the interferznce of all users simultaneously. The multistage PIC suppresses the multiple access interference in multiple consecutive steps. Stage n cancels the interference by utilizing the hard symbol decision from stage n-I. The cancellation operation itself requires knowledge of the user codes, the relative code phases, complex estimates for the multipath taps, and finally hard symbol decisions for each user.
Guog U~versity, Taoyuas T i m R0.C. Email: d8692IM8@ntt~eduhv and ac@cht.com.nv
ABSTRACT -In this paper, we propose a cumulant-based estimator for ARMA systems. The polyspectra, cumulants, and various other related statistics, such as bicepstra and bicoherence are all used to develop cumulant-based algorithms for estimating the parameters of linear (e.g. ARMA) or nonlinear processes. The use of cumulant-based estimator is useful: (1) if the additive noise is Gaussian and the signal is non-Gaussiaa, (2) the linear system is non-minimum phase (that is, mixed-phase), or (3) the process is nonlinear. 'he singula~ value plot show several significant singular values comsponding to me quadratically coupled triplet; as in the case of the power specbum (harmonics in noise), overestimating the number of harmonics usuaUy leads to bener results.
In practical approach, a Constant Modulus (CM) receiver is usually obtained from the stochastic gradient algorithm. leading to
ABsrucr-CMA. Suppose that we have a sequence of obs&ations fromthe linear Inode] 111 this paper, we propose a inethod to calculate the infinite of the Constant norm ball for the geometrical characterization Modulus Alrorithm (CMA) and Shavi and Weinstein's blind ~[ k ] = Hs[k] + w[k].(3) I . ,. estimation of linear receivers. The Constant Modulus Algorithm uses the second-and fourth-order moments of a pre-whitened chip-rate received signal. The approach provides a framework within which various blind and nonblind Wiener receivers can be finding an ellipsoid by infinite nonn balls of different types. A necessaiy and sufficient condition for the equivalence among constant modulus, Shalvi-Weistein, zero-forcing, and Wiener receivers is obtained. Including their locations and their relationship with Wiener receivers are provided for the special orthogonal channel and general two-dimensional (2-D) channel-receiver impulse response. It is also shown that the calculation of infinite norm ball via D-K iteration [I71 in 2-D, each CM or SW receiver can be obtained from associated with one and only one Wiener receiver for QAM system. Some design examples are simulated to verify our results. 1.
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