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05441004
Multiple input multiple output techniques combined
with orthogonal frequency division multiplexing (MIMO-OFDM)
provide a promising approach for wireless systems. However, a
serious drawback of the OFDM system is the high peak-toaverage
power ratio (PAPR), which may severely affect the
power efficiency of RF power amplifiers. In this paper, we
propose a simple method to reduce the PAPR of MIMO-OFDM
signals based on the use of unused subcarriers. Instead of
processing the signals at each transmitter separately, a peak
cancelling signal is generated at one antenna and is then applied
to all the others with only simple modifications. Simulation has
shown that a minimum 2 dB reduction in PAPR can be achieved
for all transmit signals using this approach. As the signal
processing is nearly all done at a single transmitter, repetition of
the operations at each transmitter is avoided, and therefore the
overall cost of the system can be significantly reduced.
- 2011-11-05 01:46:42下载
- 积分：1
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AbstractPTOC
this is simply a report on the fading channel on different modulation scheme
- 2013-08-21 23:25:29下载
- 积分：1
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SAE J1939-71-2008 Vehicle Application Layer
汽车行业CAN通讯SAEJ1939标准英文版(Auto Industry CAN Communication SAEJ1939 Standard English Edition)
- 2020-06-18 00:20:01下载
- 积分：1
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Smart-Antennas-For-Wireless-
描述了智能天线在无线通信环境下的各种应用。(Describes a smart antenna in a wireless communication environment, a variety of applications.)
- 2013-09-09 20:30:32下载
- 积分：1
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ns2-extension
介绍如何对NS2进行多信道多接口扩展，并支持动态信道分配。(NS2 introduce how to carry out the expansion of multi-channel multi-interface, and supports dynamic channel allocation.)
- 2009-03-12 20:28:24下载
- 积分：1
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spectralnull
a document wich explain spectral null codes
- 2012-06-16 00:18:48下载
- 积分：1
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STK-develop
SIM卡为表示能够执行proactive command且支持SAT，它必须在文件EFphaseTKG EFsst中有相关数据。 Phase文件指的是SIM卡所支持的GSM标准的级数，值为3则指SIM卡支持GSM phase 2和设置下传功能（profile download)。SST文件包含支持哪些GSM性能的准确信息。(SIM card that can support the implementation of proactive command and the SAT, it must file EFphaseTKG EFsst have relevant data. Phase document refers to the SIM card supports the GSM standard series, a value of 3 means the SIM card supports the GSM phase 2 and settings transfer function (profile download). SST file which contains support for GSM performance of accurate information.)
- 2011-06-16 12:44:25下载
- 积分：1
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ourdev_598464
DMX 512协议是Digital Multiplex的缩写，是灯光行业数字化设备的通用信号控制协议，同时也是是一种国际协议。 USITT DMX512/1990是调光和灯光控制台数据传输标准，是娱乐灯光领域常用的控制协议。以前0-10V模拟控制用的比较多，现在DMX512是娱乐灯光行业最主要的控制协议。USITT DMX512/1990是由美国剧场技术协会USITT提出的。最原始的版本出版于1986年，在1990年做了修改。 (DMX 512 protocol is short for Digital Multiplex is light industry, general-purpose digital signal device control protocol, but also is an international agreement. USITT DMX512/1990 is dimming and lighting control data transmission standard, is commonly used in the field of entertainment lighting control protocol. 0-10V analog control previously used more, now is the entertainment lighting industry, the main DMX512 control protocol. USITT DMX512/1990 by the American Association of Theater Technology USITT s. The original version published in 1986, was revised in 1990.)
- 2011-12-02 15:44:06下载
- 积分：1
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IR_Trainning_DOC
Philips RC-5/6协议
Philips RC-MM协议
红外编码格式17- Toshiba TC9148P
NEC协议 经本人翻译为中文版本的，很好的开发档案，值得下载！(Philips RC-5/6 Philips RC-MM protocol agreement infrared code format 17- Toshiba TC9148P NEC protocol for the Chinese version translated by me, the good development of the file, it is worth downloading!)
- 2010-10-07 17:23:32下载
- 积分：1
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DLT645-2007
DL/T645-2007清晰文本版，可以CTRL+F(DL/T645-2007 clear text version, you can CTRL+ F)
- 2008-12-18 13:14:31下载
- 积分：1
