### Citations

11970 | Maximum likelihood from incomplete data via the em algorithm
- Dempster, Laird, et al.
- 1977
(Show Context)
Citation Context ...ed filter. Only after considering the outputs of the matched filter, a decision is made w.r.t. the symbol rate. C. EM approach The last approach is based on the ExpectationMaximization (EM) algorithm =-=[17]-=-. The EM algorithm is a method that iteratively solves the problem of ML estimation of a parameter b. The algorithm makes use of the so-called complete data z. The complete data is related . Algorithm... |

365 |
The software radio architecture
- Mitola
- 1995
(Show Context)
Citation Context ...eration wireless devices will be expected to support different standards and different types of content. This has encouraged extensive research in the field of so-called Software Defined Radios (SDR) =-=[1]-=-. In these devices, the use of analog components is minimized in favor of Digital Signal Processing (DSP), controlled by (changeable) software programs. Physical layer aspects of software radio design... |

204 | Adaptive Coded Modulation for Fading Channels," - Goldsmith, Chua - 1998 |

200 |
Synchronization Techniques for Digital Receivers,
- Mengali, D’Andrea
- 1997
(Show Context)
Citation Context ...start from the Maximum Likelihood (ML) principle. We denote by r the expansion of r (t) onto a suitable basis. The ML estimate of the symbol interval is obtained by maximizing the likelihood function =-=[16]-=-: with ˆTML = arg max p (r |T ) (4) T ∈S p (r |T ) = Ea,τ,h [p (r |a, τ, h, T )] (5) where Ea,τ,h [.] denotes the averaging over all possible data sequences, τ and h. Taking into account the AWGN nois... |

106 |
Iterative Demapping and Decoding for Multilevel Modulation,"
- Brink, Speidel, et al.
- 1998
(Show Context)
Citation Context ... � 1 � ˜y T˜ k ˜ � T + ˆτ − ˆ h √ �2 � Esa� � � with C a √ ˜T normalizing constant. In the case of coded transmission, the a posteriori symbol probabilities can be computed using a MAP detector [26], =-=[27]-=-. As the latter approach will drastically increase the overall computational complexity,sRDEP 10 0 10 −1 10 −2 10 −3 10 −4 10 −5 cyclic correlation low SNR EM−based + estimate(τ,θ) EM−based + perfect(... |

105 |
Nonlinear estimation of PSK-modulated carrier phase with application to burst digital transmission
- Viterbi, Viterbi
- 1983
(Show Context)
Citation Context ...orithm: the propagation delay τ and the carrier phase θ are either known to the receiver (this situation will be referred to as perfect(τ, θ)) or estimated using conventional algorithms from [28] and =-=[29]-=-, respectively (to be referred to as estimate(τ, θ)). In Fig. 3 we show the RDEP for the three RD algorithms. On the left-hand side, we show the performance for the receiver from Fig. 1: in the SNR-re... |

85 |
Optimal decoding of linear codes for minimising symbol error rate”,
- Bahl, Cocke, et al.
- 1974
(Show Context)
Citation Context ...� � N0 � 1 � ˜y T˜ k ˜ � T + ˆτ − ˆ h √ �2 � Esa� � � with C a √ ˜T normalizing constant. In the case of coded transmission, the a posteriori symbol probabilities can be computed using a MAP detector =-=[26]-=-, [27]. As the latter approach will drastically increase the overall computational complexity,sRDEP 10 0 10 −1 10 −2 10 −3 10 −4 10 −5 cyclic correlation low SNR EM−based + estimate(τ,θ) EM−based + pe... |

85 |
Digital Filter and Square Timing Recovery,”
- Oerder
- 1988
(Show Context)
Citation Context ...based algorithm: the propagation delay τ and the carrier phase θ are either known to the receiver (this situation will be referred to as perfect(τ, θ)) or estimated using conventional algorithms from =-=[28]-=- and [29], respectively (to be referred to as estimate(τ, θ)). In Fig. 3 we show the RDEP for the three RD algorithms. On the left-hand side, we show the performance for the receiver from Fig. 1: in t... |

76 |
Giannakis, “Statistical tests for presence of cyclostationarity
- Dandawate, B
- 1994
(Show Context)
Citation Context ...m the companion paper [5] can be applied to any multi-rate system. Apart from the abovementioned work for DS-CDMA, most blind rate detectors exploit the cyclostationarity of the received signal [11], =-=[12]-=-. Although such detectors have some very attractive properties, they fail to operate properly when the excess bandwidth decreases or when the SNR is not sufficiently high. Since the data will generall... |

24 | Asymptotic analysis of blind cyclic correlation-based symbol-rate estimators.
- Ciblat, Loubaton, et al.
- 1934
(Show Context)
Citation Context ...es from the companion paper [5] can be applied to any multi-rate system. Apart from the abovementioned work for DS-CDMA, most blind rate detectors exploit the cyclostationarity of the received signal =-=[11]-=-, [12]. Although such detectors have some very attractive properties, they fail to operate properly when the excess bandwidth decreases or when the SNR is not sufficiently high. Since the data will ge... |

23 | Sample Rate Conversion for Software Radio
- Hentschel, Fettweis
- 2000
(Show Context)
Citation Context ...controlled by (changeable) software programs. Physical layer aspects of software radio design regarding filter design, analog-todigital conversion (ADC) and sample rate conversion can be found in [2]–=-=[4]-=-. This contribution is devoted to the aspects of rate detection and sample rate conversion for SDR and capitalizes on the results from [5]. In multi-rate systems with burst transmission, the symbol ra... |

9 | Code-aided frame synchronizers for AWGN channels
- Wymeersch, Moeneclaey
- 2003
(Show Context)
Citation Context ... many-to-one mapping r = g (z). However, when b can take on values in a discrete set S only, the EM algorithms suffers from convergence problems [18]. To avoid this, we propose the following solution =-=[19]-=-: where ˆb = arg max Q (b| b) , (6) b∈S Q (b| b) = Ez [log p (z| b) |r; b] (7) This approach has been shown to have very good performance in other detection problems [20] and does not require an initi... |

8 |
BTurbo-synchronization: An EM algorithm approach
- Noels, Herzet, et al.
(Show Context)
Citation Context ...s performed. This is followed by estimation of τ and h. This estimation can be performed by means of a classical algorithm (see [16], [21], [22]) or by means of a more sophisticated EM algorithm (see =-=[23]-=-–[25]). The next step (computation of soft symbol decisions) requires some additional explanation: when determining b = T and selecting as �complete � data z = [r, a], it can be verified that [23] Q ˜... |

8 | Joint estimation of path delay and complex gain for coded systems using the EM algorithm
- Guenach, Wymeersch, et al.
- 2004
(Show Context)
Citation Context ...formed. This is followed by estimation of τ and h. This estimation can be performed by means of a classical algorithm (see [16], [21], [22]) or by means of a more sophisticated EM algorithm (see [23]–=-=[25]-=-). The next step (computation of soft symbol decisions) requires some additional explanation: when determining b = T and selecting as �complete � data z = [r, a], it can be verified that [23] Q ˜T � �... |

7 |
Digital IF Filter Technology for 3G Systems: An Introduction
- Chester
- 1999
(Show Context)
Citation Context ...P), controlled by (changeable) software programs. Physical layer aspects of software radio design regarding filter design, analog-todigital conversion (ADC) and sample rate conversion can be found in =-=[2]-=-–[4]. This contribution is devoted to the aspects of rate detection and sample rate conversion for SDR and capitalizes on the results from [5]. In multi-rate systems with burst transmission, the symbo... |

7 | algorithm-based timing synchronization in turbo receivers - ”EM - 2003 |

6 | Code-aided phase and timing ambiguity resolution for AWGN channels
- Wymeersch, Moeneclaey
- 2003
(Show Context)
Citation Context ...ropose the following solution [19]: where ˆb = arg max Q (b| b) , (6) b∈S Q (b| b) = Ez [log p (z| b) |r; b] (7) This approach has been shown to have very good performance in other detection problems =-=[20]-=- and does not require an initial estimate of b. Note that (6) can be applied only when S is finite. How to apply the EM algorithm to the rate detection problem is shown in Algorithm 1. For a given tri... |

5 |
ML-based blind symbol rate detection for multi-rate receivers
- Wymeersch, Moeneclaey
- 2005
(Show Context)
Citation Context ...nversion (ADC) and sample rate conversion can be found in [2]–[4]. This contribution is devoted to the aspects of rate detection and sample rate conversion for SDR and capitalizes on the results from =-=[5]-=-. In multi-rate systems with burst transmission, the symbol rate is constant within a frame, but can vary from one frame to the next. The transmitter can decide to change the symbol rate depending on ... |

5 | channel estimation for multi-rate CDMA systems
- Roy, Yan, et al.
- 2002
(Show Context)
Citation Context ... the spreading codes or by fixing the length of the spreading codes and varying the chip rate. These techniques are known as Variable Spreading Factor (VSF) and Variable Chip Rate (VCR), respectively =-=[7]-=-. Technical literature has thus-far mainly focused on VSF-CDMA (see for example [8]–[10] and references therein). However, the considered rate detection algorithms are very applicationspecific, are of... |

5 |
On the (non) convergence of the EM algorithm for discrete parameter estimation
- Spasojevic, Georghiades
- 2000
(Show Context)
Citation Context ...y � T˜ k ˜ � T + ˆτ � to the observation r through some many-to-one mapping r = g (z). However, when b can take on values in a discrete set S only, the EM algorithms suffers from convergence problems =-=[18]-=-. To avoid this, we propose the following solution [19]: where ˆb = arg max Q (b| b) , (6) b∈S Q (b| b) = Ez [log p (z| b) |r; b] (7) This approach has been shown to have very good performance in othe... |

4 | Minimal block processing approach to fractional sample rate conversion - Göckler, Evangelista, et al. - 2001 |

4 |
Code-aided blind rate detection for multirate DS/CDMA
- Buzzi, Maio
(Show Context)
Citation Context ... chip rate. These techniques are known as Variable Spreading Factor (VSF) and Variable Chip Rate (VCR), respectively [7]. Technical literature has thus-far mainly focused on VSF-CDMA (see for example =-=[8]-=-–[10] and references therein). However, the considered rate detection algorithms are very applicationspecific, are often developed specifically for BPSK, and, more importantly, are derived under the a... |

4 | Blind rate detection for multirate UMTS DS-CDMA signals - Sharma, Mitra - 2001 |

4 |
A ML rate detection algorithm for IS-95 CDMA
- Gutierrez, Lee, et al.
- 1999
(Show Context)
Citation Context ...p rate. These techniques are known as Variable Spreading Factor (VSF) and Variable Chip Rate (VCR), respectively [7]. Technical literature has thus-far mainly focused on VSF-CDMA (see for example [8]–=-=[10]-=- and references therein). However, the considered rate detection algorithms are very applicationspecific, are often developed specifically for BPSK, and, more importantly, are derived under the assump... |

4 |
On a timing recovery technique for a variable symbol rate signal
- Lee, Chung, et al.
- 1997
(Show Context)
Citation Context ...ill generally be protected by an error-correcting code, a low SNR operating point can be assumed, so that these algorithms are no longer suitable. Another type of symbol rate detector was proposed in =-=[13]-=-: the received signal was filtered using an analog filter bank. Through an ad-hoc criterion, the most likely signal bandwidth was determined. The authors reported an estimation accuracy of 99.5% (i.e.... |

4 |
Digital modems using non-synchronized sampling: matched filter + interpolator versus interpolator + matched filter
- Bucket, Moeneclaey
- 1998
(Show Context)
Citation Context ...phase, timing correction and sample rate conversion (SRC) [4]. To avoid the need for a bank of matched filters, we will consider a different receiver structure (depicted in Fig. 2), first proposed in =-=[15]-=- and extended in [14]. In this low-complexity sub-optimal receiver, the matched filter is preceded by a digital interpolator. The interpolator performs sample rate conversion (i.e, it has input rate 1... |

2 |
Multi-rate receivers with IF sampling and digital timing correction
- Wymeersch, Moeneclaey
- 2004
(Show Context)
Citation Context ...on of the maximum likelihood (ML) criterion and one based on the ExpectationMaximization (EM) algorithm. These algorithm will be applied to a particular receiver, designed for multi-rate transmission =-=[14]-=-. These algorithms will further be compared to a cyclic correlation-based approach from literature in terms of their rate error probability performance. Additionally, the impact of the proposed algori... |