This paper presents a first monolithic RF transceiver for DC-OFDM UWB applications.The proposed direct-conversion transceiver integrates all the building blocks including two receiver（Rx） cores,two transmitter （Tx...This paper presents a first monolithic RF transceiver for DC-OFDM UWB applications.The proposed direct-conversion transceiver integrates all the building blocks including two receiver（Rx） cores,two transmitter （Tx） cores and a dual-carrier frequency synthesizer（DC-FS） as well as a 3-wire serial peripheral interface（SPI） to set the operating status of the transceiver.The ESD-protected chip is fabricated by a TSMC 0.13-μm RF CMOS process with a die size of 4.5 x 3.6 mm2.The measurement results show that the wideband Rx achieves an NF of 5-6.2 dB,a max gain of 76-84 dB with 64-dB variable gain,an in-/out-of-band IIP3 of-6/＋4 dBm and an input loss S11 of〈-10 in all bands.The Tx achieves an LOLRR/IMGRR of-34/-33 dBc,a typical OIP3 of＋6 dBm and a maximum output power of -5 dBm.The DC-FS outputs two separate carriers simultaneously with an inter-band hopping time of〈1.2 ns.The full chip consumes a maximum current of 420 mA under a 1.2-V supply.展开更多
时变强多途干扰影响水声通信系统性能,针对时变强多途干扰问题,提出基于差分编码的水声OFDM通信(Underwater acoustic OFDM communications based on differential coding,DC-OFDM)算法。利用循环前缀技术和OFDM通信技术固有的抗多途特...时变强多途干扰影响水声通信系统性能,针对时变强多途干扰问题,提出基于差分编码的水声OFDM通信(Underwater acoustic OFDM communications based on differential coding,DC-OFDM)算法。利用循环前缀技术和OFDM通信技术固有的抗多途特性,有效消除时变多途干扰,避免信道估计环节,直接进行解码判决。南海实测信道仿真(信噪比为8dB时,DQPSK100组仿真试验,2×10^(6)个源码,全部正确解码)和水箱试验(信噪比为15dB时,DQPSK100组水箱试验,2×10^(6)个源码,在时变强多途干扰下全部正确解码)。结果表明,所提算法能有效解决时变强多途干扰问题,实现时变强多途水声信道下的可靠水声通信。展开更多
基金supported by the National Science & Technology Major Projects of China(No.2009ZX03006-007-01)the National High Technology R&D Program of China(No.2009AA01 Z261)
文摘This paper presents a first monolithic RF transceiver for DC-OFDM UWB applications.The proposed direct-conversion transceiver integrates all the building blocks including two receiver（Rx） cores,two transmitter （Tx） cores and a dual-carrier frequency synthesizer（DC-FS） as well as a 3-wire serial peripheral interface（SPI） to set the operating status of the transceiver.The ESD-protected chip is fabricated by a TSMC 0.13-μm RF CMOS process with a die size of 4.5 x 3.6 mm2.The measurement results show that the wideband Rx achieves an NF of 5-6.2 dB,a max gain of 76-84 dB with 64-dB variable gain,an in-/out-of-band IIP3 of-6/＋4 dBm and an input loss S11 of〈-10 in all bands.The Tx achieves an LOLRR/IMGRR of-34/-33 dBc,a typical OIP3 of＋6 dBm and a maximum output power of -5 dBm.The DC-FS outputs two separate carriers simultaneously with an inter-band hopping time of〈1.2 ns.The full chip consumes a maximum current of 420 mA under a 1.2-V supply.
文摘时变强多途干扰影响水声通信系统性能,针对时变强多途干扰问题,提出基于差分编码的水声OFDM通信(Underwater acoustic OFDM communications based on differential coding,DC-OFDM)算法。利用循环前缀技术和OFDM通信技术固有的抗多途特性,有效消除时变多途干扰,避免信道估计环节,直接进行解码判决。南海实测信道仿真(信噪比为8dB时,DQPSK100组仿真试验,2×10^(6)个源码,全部正确解码)和水箱试验(信噪比为15dB时,DQPSK100组水箱试验,2×10^(6)个源码,在时变强多途干扰下全部正确解码)。结果表明,所提算法能有效解决时变强多途干扰问题,实现时变强多途水声信道下的可靠水声通信。
