AVS3 is the latest member of the family of video coding standards developed by Peng Cheng Laboratory,Peking University,as well as relevant enterprises and institutions.Capable of encoding video with approximately 40%b...AVS3 is the latest member of the family of video coding standards developed by Peng Cheng Laboratory,Peking University,as well as relevant enterprises and institutions.Capable of encoding video with approximately 40%bitrate savings for the same subjective quality compared to HEVC,AVS3 has been included in the recently published ETSI TS 101154 V2.8.1,Digital video broadcasting-Specification for the use of video and audio coding in broadcasting applications,which is another success after AVS3 codex was added to DVB’s media delivery toolbox.展开更多
ETSI EN 301893 V2.1.1《5 GHz RLAN;Harmonised Standard covering the essential requirements of article 3.2 of Directive2014/53/EU》中的自适应测试是5G wifi测试中的一个重难点,本文针对标准中的自适应测试所涉及的各个指标参...ETSI EN 301893 V2.1.1《5 GHz RLAN;Harmonised Standard covering the essential requirements of article 3.2 of Directive2014/53/EU》中的自适应测试是5G wifi测试中的一个重难点,本文针对标准中的自适应测试所涉及的各个指标参数进行分析和解读。展开更多
Most satellite digital radio (SDR) systems use orthogonal frequency-division multiplexing (OFDM) transmission, which means that variable envelope signals are distorted by the RF power amplifier (PA). It is custo...Most satellite digital radio (SDR) systems use orthogonal frequency-division multiplexing (OFDM) transmission, which means that variable envelope signals are distorted by the RF power amplifier (PA). It is customary to back off the input power to the PA to avoid the PA nonlinear region of operation. In this way, linearity can be achieved at the cost of power efficiency. Another attractive option is to use a linearizer, which compensates for the nonlinear effects of the PA. In this paper, an OFDM transmitter conforming to European Telecommunications Standard Institute SDR Technical Specifications 2007-2008 was designed and implemented on a low-cost field-programmable gate array (FPGA) platform. A weakly nonlinear PA, operating in the L-band SDR frequency, was used for signal transmission. An adaptive linearizer was designed and implemented on the same FPGA device using digital predistortion to correct the undesired effects of the PA on the transmitted signal. Test results show that spectral distortion can be suppressed between 6-9 dB using the designed linearizer when the PA is driven close to its saturation region.展开更多
During their 73rd General Assembly,April 2-3,2019,ETSI members re-elected the current ETSI Director-General Mr.Luis Jorge Romero with an overwhelming majority on the first ballot.ETSKs Director-General is elected for ...During their 73rd General Assembly,April 2-3,2019,ETSI members re-elected the current ETSI Director-General Mr.Luis Jorge Romero with an overwhelming majority on the first ballot.ETSKs Director-General is elected for a five-year term of office,which may be extended by the members for a further three years.Luis Jorge Romero,first elected as ETSl's Director-General 8 years ago,has 30 years' experience in the telecommunications sector.展开更多
文摘AVS3 is the latest member of the family of video coding standards developed by Peng Cheng Laboratory,Peking University,as well as relevant enterprises and institutions.Capable of encoding video with approximately 40%bitrate savings for the same subjective quality compared to HEVC,AVS3 has been included in the recently published ETSI TS 101154 V2.8.1,Digital video broadcasting-Specification for the use of video and audio coding in broadcasting applications,which is another success after AVS3 codex was added to DVB’s media delivery toolbox.
文摘ETSI EN 301893 V2.1.1《5 GHz RLAN;Harmonised Standard covering the essential requirements of article 3.2 of Directive2014/53/EU》中的自适应测试是5G wifi测试中的一个重难点,本文针对标准中的自适应测试所涉及的各个指标参数进行分析和解读。
文摘Most satellite digital radio (SDR) systems use orthogonal frequency-division multiplexing (OFDM) transmission, which means that variable envelope signals are distorted by the RF power amplifier (PA). It is customary to back off the input power to the PA to avoid the PA nonlinear region of operation. In this way, linearity can be achieved at the cost of power efficiency. Another attractive option is to use a linearizer, which compensates for the nonlinear effects of the PA. In this paper, an OFDM transmitter conforming to European Telecommunications Standard Institute SDR Technical Specifications 2007-2008 was designed and implemented on a low-cost field-programmable gate array (FPGA) platform. A weakly nonlinear PA, operating in the L-band SDR frequency, was used for signal transmission. An adaptive linearizer was designed and implemented on the same FPGA device using digital predistortion to correct the undesired effects of the PA on the transmitted signal. Test results show that spectral distortion can be suppressed between 6-9 dB using the designed linearizer when the PA is driven close to its saturation region.
文摘During their 73rd General Assembly,April 2-3,2019,ETSI members re-elected the current ETSI Director-General Mr.Luis Jorge Romero with an overwhelming majority on the first ballot.ETSKs Director-General is elected for a five-year term of office,which may be extended by the members for a further three years.Luis Jorge Romero,first elected as ETSl's Director-General 8 years ago,has 30 years' experience in the telecommunications sector.