Transmission scheme for the terrestrial ISDB system

Uehara, Michihiro; Takada, Masayuki; Kuroda, Tôru

doi:10.1109/30.754424

Cited by 13 publications

(4 citation statements)

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“…3, where the measurement target signal is assumed to be ISDB-T compatible [3], [4], meaning that it is an OFDM signal with a bandwidth of 5.6 MHz and more than 5000 subcarriers within this bandwidth. Due to the large number of subcarriers, the instantaneous sample follows a complex Gaussian distribution; that is, the instantaneous magnitude follows a Rayleigh distribution.…”

Section: A Simulated and Experimental Conditionsmentioning

confidence: 99%

“…This distortion falls inside the original signal band, and also leaks outside the band, which we refer to as out-of-band (OOB) distortion in this paper. Depending on the specific wireless standard concerned, OOB distortion may be called various names, such as shoulder attenuation in DVB-T [2], inter-modulation distortion in ISDB-T [3], [4], and adjacent channel power/leakage ratio (or ACPR/ACLR) in WLANs. In all of these cases, the definition is fundamentally the same-the power ratio of the desired signal to the induced distortion.…”

Section: Introductionmentioning

confidence: 99%

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Uncertainty of Out-of-Band Distortion Measurement With a Spectrum Analyzer

Tanahashi

Yamaguchi

2015

IEEE Trans. on Broadcast.

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In broadcasting and wireless communications, modulated signals are deformed by nonlinear radio frequency components, of which power amplifiers are the most significant example. The resulting distortion can leak outside the main signal band, and this leak, called out-of-band (OOB) distortion, can be directly measured with a spectrum analyzer (SA). Little attention has been paid to this measurement. In particular, it is often assumed that there is no measurement uncertainty, regardless of the condition of the instrument. However, in this paper, we show that the measurement of OOB distortion depends strongly on the various setting parameters of the SA because of its intricate internal signal processing for detection and visualization. Our analysis reveals that the underlying reason for this dependence is the difference between envelope amplitude statistics detected inside and outside of the main signal band.Index Terms-Spectrum analyzer (SA), out-of-band (OOB) distortion, power amplifier, digital modulation, orthogonal frequency division multiplexing (OFDM), adjacent channel power ratio (ACPR), adjacent channel leakage ratio (ACLR), shoulder attention, intermodulation distortion.

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Section: A Simulated and Experimental Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Uncertainty of Out-of-Band Distortion Measurement With a Spectrum Analyzer

Tanahashi

Yamaguchi

2015

IEEE Trans. on Broadcast.

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“…O número de portadoras depende do modo utilizado, mas a taxa de bits não é alterada para os três modos. Para cada modo existem diferentes configurações para intervalo de guarda, codificador convolucional e período do entrelaçador temporal, como mostra a tabela 1 [3].…”

Section: B Modos De Transmissãounclassified

Resultados dos testes de campo para o sistema Brasileiro de TV Digital ISDTV

Ono¹,

Akamine²,

Yamada³

2007

Anais Do XXV Simpósio Brasileiro De Telecomunicações

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In July, 2006, the Brazilian Government established, the ISDTV as standard for digital terrestrial broadcasting TV in Brazil. The main innovations of ISDTV were the adoption of H264/AVC video coding in all transmissions layers and the use of a middleware developed in Brazil. This work presents a summary of the new modulation scheme (ISDTV) and the results of a field test carried out to evaluate the new system performance, in Sao Paulo. The field test procedure included the capture and record of the RF signal, using a "RF capture" equipment and analyzing the results in the laboratory.

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“…It has been adopted in wireline applications such as ADSL (Asymmetric Digital Subscriber Line) [4], broadcasting services such as European DAB (Digital Audio Broadcasting) [5], DVB-T (Terrestrial Digital Video Broadcasting) [6] and Japanese ISDB-T (Terrestrial Integrated Services Digital Broadcasting) [7], high rate wireless LAN standards such as ETSI HiperLAN 2 and IEEE 802.11(a), and multimedia wireless services such as Japanese MMAC (Multimedia Mobile Access Communications) [8], [9].…”

Section: Introductionmentioning

confidence: 99%