In this paper, we study the performance of an Orthogonal Frequency Division Multiplexing (OFDM) WiMAX transmission system with adaptive modulation and coding (AMC) over different fading channels. An explanation necessary to understand the block diagram of the system is briefly given and a MATLAB ...
In communication systems, the modulation methods are used to transmit signals over long distances. In the modulation process, the properties of a high-frequency signal such as amplitude, phase, etc… are changed according to the low-frequency base-band signal. With the increase in digital technolo...
symbol-level adaptive modulation wherein all the subcarriers in an OFDM symbol use the same modulation. Index Terms—Orthogonal frequency division multiplexing (OFDM), Bit interleaved coded modulation (BICM), Adaptive modulation and coding (AMC). ...
转格式 37阅读文档大小:294.34K4页wangzhidaoj上传于2015-03-20格式:PDF Model-Based X-Ray CT Image and Light Field … 热度: Context-based adaptive binary arithmetic coding in the H264AVC 热度: Error Concealment technique for Block-based coding … ...
the base stations employ adaptive modulation and coding (AMC) techniques which adjust different modulation and coding schemes (MCS) used for transmission according to the channel state information (CSI) signals fed back from the users. Therefore, relevant and timely CSI signalling is extremely importan...
We are interested in lossless and progressive coding of multispectral images. To this respect, nonseparable vector lifting schemes are used in order to exploit simultaneously the spatial and the interchannel similarities. The involved operators are adapted to the image contents thanks to block-based pro...
T reg lymphocytes have been shown to have a role in the prevention of organ-specific autoimmune diseases and in modulation of immune responses to microbial pathogens to prevent overwhelming inflammatory reactions. Finally, a subpopulation of CD4 lymphocytes characterized by the ability to produce IL-...
WO/2006/118892November, 2006CHANNEL QUALITY AND PERFORMING MODULATION/CODING WO/2007/040906April, 2007A METHOD AND SYSTEM FOR LINK ADAPTATION IN A WIRELESS MULTI CARRIER COMMUNICATION SYSTEM Other References: Hassan, “LPDC encoded pilots for iterative receiver improvement”, pp. 1-30, Dec. 2005. ...
modulation and coding levels to apply to a downlink signal transmitted from the base station to the user equipment, the selection being based upon a comparison between the reported downlink signal transmission quality and a threshold value; and a threshold value adjusting unit operable, when the ...
7.A method as claimed in claim 1, wherein the or each said adjustable value is a non-integer value and in the selecting step a rounded version of the or one said adjustable value is employed to select said modulation and coding level to apply to said signal, said rounded version represen...