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## Systems in Fading Environments (1997)

### Citations

1082 |
1979]. Optimal Filtering
- Anderson, Moore
(Show Context)
Citation Context ...meansquare error. In fact, this criterion was used to develop the recursive multiuser receiver of [5]. In this section, we examine the structure of this equalizer, which is based on the Kalman filter =-=[6]-=-, for the single user case. 3.2.1 Channel State-Space Model To derive the Kalman filter, we must cast the channel of Figure 2-1 into state-space form. The approach taken in [5] is to used the cascade ... |

991 | The viterbi algorithm - Forney - 1973 |

136 |
Parameter estimation of superimposed signals using the EM algorithm
- Feder, Weinstein
- 1988
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Citation Context ...er equations of the 43sprevious section. 4.3.1 Expectation-Maximization Algorithm Our approach to finding parameter estimates ˆ θ is similar in principle to the ExpectationMaximization (EM) algorithm =-=[8]-=-, which iteratively computes Maximum-Likelihood (ML) 2 estimates of the parameters θ based on the observations of the random vector q = [ q[0] · · · q[N − 1] ] T (4.14) Direct computation of the ML es... |

28 |
Spread-response precoding for communication over fading channels
- Wornell
- 1996
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Citation Context ...he linear equalizer b[n] which maximizes this quantity; however, in this section, we consider the effects of the unknown error sequence (5.1) in the analysis. where Again following the development of =-=[2]-=-, we first rewrite γ(b) as γ(b) = and in which we have exploited the identity 1 1/φ(b) − 1 |E [ab]| φ(b) = 2 �� E |a| 2 � + ξ0 |b| 2� � Var [ab] = E |ab| 2� − |E [ab]| 2 We note that maximizing φ(b) i... |

26 |
Spread-signature CDMA: efficient multiuser communication in the presence of fading
- Wornell
- 1995
(Show Context)
Citation Context ...hese distortions, wireless fading channels exhibit dramatically poorer bit-error performance than traditional additive white Gaussian noise channels when using uncoded transmissions. Recent work [2], =-=[3]-=- has suggested a technique called spread-response precoding for combating ISI and signal fading found in wireless links. The idea behind this sort of precoding is to temporally distribute the energy o... |

4 | Signal enhancement using single and multi-sensor measurements,” RLE
- Weinstein, Oppenheim, et al.
- 1990
(Show Context)
Citation Context ... re-estimating the entire length (N + 1) sequence, which is impractical. As an alternative, we combine the notions of iterations k and time n, to form a sequential algorithm such as that developed in =-=[9]-=-. In particular, upon the observation q[n], we use the previous parameter estimate ˆ θn−1 to iterate the Kalman filter equations (4.9) and (4.10) (with θ = ˆ θn−1), thereby obtaining the estimates (4.... |

3 |
An energy- and bandwidth-efficient data transmission system for timeselective fading channels
- Wittneben
- 1990
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Citation Context ...noise intensity N0. However, in practice, only estimates of these quantities may be available at the receiver. For spread-response precoding systems over the frequency nonselective channel, Wittneben =-=[7]-=- demonstrated SNR loss due to noisy channel estimates and only moderate sensitivity of the output SNR to estimates of N0. These preliminary results motivate us to look at the effects of channel estima... |

2 |
Recursive multiuser equalization for CDMA systems in fading environments
- Isabelle, Wornell
- 1996
(Show Context)
Citation Context ...interest. Due to this overlap for certain cases of the channel, we examine the minimum mean-square error criterion in more detail and develop single user versions of the recursive equalizers found in =-=[5]-=-. Comparisons between the equalizers are made in terms of their time-varying frequency responses and bit-error probabilities. 3.1 Maximum SNR Criterion Our first design criterion for obtaining optimal... |