#### DMCA

## IMPROVED OFDM RECEIVER WITH ITERATIVE CHANNEL ESTIMATION AND TURBO DECODING

### Citations

662 |
Near Optimum Error Correcting Coding and Decoding: Turbo-Codes,”
- Berrou, Glavieux
- 1996
(Show Context)
Citation Context ...al.njit.edu ABSTRACT Error correcting codes have become necessary in wireless digital communications systems. Turbo codes are one of the most powerful types of error control codes currently available =-=[1]-=-. There is a tradeoff in turbo codes between latency and BER which depends on the choice of interleaver size, number of decoding iterations and the algorithm used in the decoding process. In this pape... |

558 |
Bit-Interleaved Coded Modulation,”
- Caire, Taricco, et al.
- 1998
(Show Context)
Citation Context ...o increase the code diversity. New coding techniques other than Trellis Coded Modulation (TCM)[3] have been proposed to maximize the code diversity; such as the Bit-Interleaved Coded Modulation (BICM)=-=[4]-=-, or Bit-Interleaved Coded Modulation with Iterative Decoding (BICM-ID) [5], which uses soft decision metrics and the soft-input soft-output decoder based on a posteriori probabilities (APP-SISO decod... |

545 |
Channel Coding with Multilevel/Phase Signals
- Ungerboeck
- 1982
(Show Context)
Citation Context ...ng techniques. 1 1. INTRODUCTION Due to the interest in mobile-radio communications, it became necessary to increase the code diversity. New coding techniques other than Trellis Coded Modulation (TCM)=-=[3]-=- have been proposed to maximize the code diversity; such as the Bit-Interleaved Coded Modulation (BICM)[4], or Bit-Interleaved Coded Modulation with Iterative Decoding (BICM-ID) [5], which uses soft d... |

287 |
The expectation-maximization algorithm,”
- Moon
- 1996
(Show Context)
Citation Context ...nformation for the other decoder. 3.2 The EM algorithm for channel estimation and decoding The main reason to use the EM Algorithm is because a maximum likelihood solution has no closed form solution =-=[9]-=- .The EM Algorithm consists of two steps: an expectation step and a maximization step. Considering the terminology of the EM Algorithm we define the set z = {y,x} as the complete data set, y is the ob... |

176 |
Bit-interleaved coded modulation with iterative decoding and 8-PSK,”
- Li, Chidapol, et al.
- 2002
(Show Context)
Citation Context ...ed Modulation (TCM)[3] have been proposed to maximize the code diversity; such as the Bit-Interleaved Coded Modulation (BICM)[4], or Bit-Interleaved Coded Modulation with Iterative Decoding (BICM-ID) =-=[5]-=-, which uses soft decision metrics and the soft-input soft-output decoder based on a posteriori probabilities (APP-SISO decoder) [6]. The later outperforms the first by providing larger coding gains. ... |

90 |
A statistical discrete-time model for the WSSUS multipath channel,”
- Hoeher
- 1992
(Show Context)
Citation Context ...e complete channel response including transmitter filter, the multipath channel and the receiver filter. 2.3 WSSUS channel The channel is assumed a Wide Sense Stationay Uncorrelated Scattering (WSSUS)=-=[7]-=- mobile radio channel whose instantaneus response is given by, 1 L h(τ,t) = lim √ ∑ exp L→∞ L n=1 j(θn+2π fDn t )δ(τ − τn) (2) where L is the number of paths that superpose the signal. Each echo has a... |

71 |
A soft-input soft-output Maximum A Posterior (MAP) module to decode parallel and serial concatenated codes,”
- Benedetto, Montorsi, et al.
- 1996
(Show Context)
Citation Context ... Bit-Interleaved Coded Modulation with Iterative Decoding (BICM-ID) [5], which uses soft decision metrics and the soft-input soft-output decoder based on a posteriori probabilities (APP-SISO decoder) =-=[6]-=-. The later outperforms the first by providing larger coding gains. Another coding technique based on turbo codes [1], achieves near channel capacity error correcting, i.e it is able to transmit infor... |

1 |
novel reducedcomplexity EM based receiver with joint iterative channel estimation and decoding”, 41st Annual Allerton Conference
- Francisco, Bar-Ness, et al.
- 2003
(Show Context)
Citation Context ...PSA) techniques. Our proposed receiver uses comb-type channel estimation (technique of inserting pilot tones used when the channel varies rapidly ,even over one OFDM symbol). In this paper similar to =-=[2]-=- we propose a scheme for joint channel estimation and decoding via the Expectation Maximization (EM) Algorithm using turbo decoding that perfoms less calculations than in the conventional receiver obt... |

1 |
Improved OFDM receiver for joint iterative channel estimation and decoding employing turbo code
- Perez
- 2004
(Show Context)
Citation Context ...s using, because the weight of every operation is different if one use a DSP, FPGA or ASIC implementation. A detailed complexity evaluation for each block at the receiver is given in terms of FLOP in =-=[8]-=-. The number of operations calculated during a decoder iteration based on a single EM channel estimation is expressed as, Ndec+Em = Nd · k(Stc · 40 + 62 + 2 · Q) + Np(Q − 1) + Nd · 7 · (Q + 1) + 10 · ... |