Introduction to Digital Mobile Communication

Akaiwa, Yoshihiko

doi:10.1002/9781119041139

Cited by 28 publications

(38 citation statements)

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“…FFT block size N c and CP length N g are set to N c =128 symbols and N g =16 samples, respectively. Square root raised cosine filter [13] with roll off factor α=1.0 is used as Nyquist filter. The timing offsets, Δ M-R , Δ B-R , Δ M and Δ B , normalized by symbol duration are assumed to be uniformly distributed over [−0.5, 0.5].…”

Section: B Transmit Fdementioning

confidence: 99%

Joint Tx/Rx FDE & spectrum combining for SC-ANC bi-directional relay in presence of timing offset

Miyazaki

Adachi

2015

2015 10th International Conference on Information, Communications and Signal Processing (ICICS)

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Recently, we proposed a joint transmit/receive frequency-domain equalization (FDE) for single-carrier (SC) analog network coded (ANC) bi-directional relay and showed that the proposed joint transmit/receive FDE achieves better BER performance than the use of either transmit FDE or receive FDE only. However, our previous study for SC-ANC bi-directional relay assumed no arrival timing offset. However, the signals transmitted from base station (BS) and mobile terminal (MT) may not necessarily arrive at the relay station (RS) at the same time. The arrival timing offset causes the inter-symbol interference and accordingly, BER performance degradation. In this paper, we propose a joint transmit/receive FDE and spectrum combining for SC-ANC bi-directional relay in the presence of timing offset. RS performs oversampling and transmit FDE while both MT and BS receivers perform oversampling, receive FDE and spectrum combining. Transmit and receive FDE weights when using the spectrum combining are jointly optimized based on minimum mean square error (MMSE) criterion. Computer simulation confirms that the proposed joint transmit/receive FDE & spectrum combining obtains both spatial and frequency diversity gain and achieves a good BER performance even in the presence of timing offset.

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Section: B Transmit Fdementioning

confidence: 99%

Joint Tx/Rx FDE & spectrum combining for SC-ANC bi-directional relay in presence of timing offset

Miyazaki

Adachi

2015

2015 10th International Conference on Information, Communications and Signal Processing (ICICS)

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“…Structures of the scrambler and its descrambler are illustrated in Fig. 1(b), where the same polynomial function is used in both the scrambler and the descrambler [6]. On the transmitter side, the best signal which exhibits the minimum PAPR is selected among U candidates and then transmitted.…”

Section: Introductionmentioning

confidence: 99%

Partial scrambling selected mapping for PAPR reduction of OFDM signals

2017

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To reduce peak-to-average-power ratio (PAPR) of OFDM signals, a self-synchronized-scrambler-based selected-mapping (SS-SLM) has been investigated, where the transmit sequence is scrambled to reduce PAPR. In this method, the receiver needs to use descrambler to recover the original data. However, the descrambling causes error propagation which degrades bit error rate (BER). In this paper, we propose a partially self-synchronizedscrambler-based selected-mapping (PSS-SLM) which scrambles only most significant bits allocated to I-phase and Q-phase of QAM symbols. Numerical results show that the proposed PSS-SLM achieves better BER than that of SS-SLM in QAM-OFDM systems while keeping the same PAPR reduction capability as SS-SLM. , vol. 15, no. 4, pp. 1567-1592, 2013. DOI:10.1109/SURV.2013 J. Armstrong, "Peak-to-average power reduction for OFDM by repeated clipping and frequency domain filtering," Electron. Lett., vol. 38, no. 5, pp. 246-247, Feb. 2002. DOI:10.1049 R. W. Bäuml, R. F. H. Fischer, and J. B. Huber, "Reducing the peak-to-average power ratio of multicarrier modulation by selected mapping," Electron. Lett.,

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“…It is known that, in the described environment, may need to be used the Radiocommunication systems, that worked in other useful radio wave frequencies. For instance, the mobile dispatch systems, which the main purpose is works in outdoor environments, in some situations, it is necessary to work in harsh, indoor environment [11] [12]. Furthermore, a detailed study of the technical literature reveals, that some works are generally inconsistent and ambiguous, because they don't describe precisely the measuring procedure and the obtained results of analysis are based on relatively small number of data sets of power density of an electromagnetic wave [13] [14].…”

Section: Introductionmentioning

confidence: 99%

An Empirical Propagation Model for Corridors in Office Buildings

Kosz¹

2017

International Journal of Electronics and Telecommunications

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-This paper presents an empirical propagation path loss model for corridors in office buildings. The proposed model estimates changeable character of radio signal attenuation, based on a special approach as a combination of the simple free-space model with the author's model. The measurement stand and measurement scenario are described. The propagation path loss research have been made in corridor for different frequencies in range 30 MHz to 290 MHz. A significant number of measurement results were allowed an analysis of the radio wave propagation conditions in the environment. In general, the propagation path loss increases for each measurement frequencies with length of propagation route. Based on measurement data, the new empirical propagation path loss model was developed. For this purpose, the regression analysis was made. The novelty of this model is that it could be used for estimate propagation path loss in measured environment for different radio wave frequencies. At the end, in order to justification the practical usefulness of described method for estimate a radio wave attenuation, the statistical evaluation was made. Thus, the results of the statistical analysis (ME, SEE and R 2 values) are satisfactory for each measured radio wave frequency.

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Introduction to Digital Mobile Communication

Cited by 28 publications

References 0 publications

Joint Tx/Rx FDE & spectrum combining for SC-ANC bi-directional relay in presence of timing offset

Joint Tx/Rx FDE & spectrum combining for SC-ANC bi-directional relay in presence of timing offset

Partial scrambling selected mapping for PAPR reduction of OFDM signals

An Empirical Propagation Model for Corridors in Office Buildings

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