Search - channel OFDM

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[Industry research] SubspacebasedblindsemiblindchannelestimationforOFD DL : 0: 基于子空间的OFDM系统半盲信道估计,是IEEE上的经典文章,请同学们相交流.-Subspace-based blind and semi-blind channel estimation for OFDMsystems(120,2002
Date : 2026-01-07 Size : 370kb User : 天天
[Industry research] mimo-ofdm_Phd_thesis DL : 0: MIMO-OFDM 国外博士论文 1.Transmitter strategies for closed-loop MIMO-OFDM,2.Spatial processing, power control, and channel allocation for OFDM wireless communications-MIMO-OFDM foreign doctoral dissertation 1.Transmitter strategies for closed-loop MIMO-OFDM, 2.Spatial processing, power control, and channel allocation for OFDM wireless communications ....
Date : 2026-01-07 Size : 7.67mb User : JIANG
[Industry research] ofdm DL : 0: 正交频分复用（OFDM，Orthogonal Frequency Division Multiplexing）是一种多载波数字调制技术，也可以被当作一种复用技术。具有频谱利用率高、抗多径干扰等特点，OFDM系统能够有效地抵抗无线信道带来的影响，例如信道的频率选择性衰落，脉冲噪声和共信道干扰的影响。本文主要介绍了OFDM原理的相关知识。-The Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) is more than one kind of carrier digital modulation technology, may also treat as one kind of multiplying technology. Has the frequency spectrum use factor high, characteristics and so on anti-multi-diameter disturbance, the OFDM system can resist the influence which effectively the wireless channel brings, for example channel s frequency selectivity declines, impulse noise/pulse noise/pulsive noise and altogether channel disturbance influence. This article mainly introduced the OFDM principle related knowledge.
Date : 2026-01-07 Size : 326kb User : 卡其米奇
[Industry research] capacitymimo DL : 0: This paper deals with the capacity behavior of wireless Orthogonal Frequency Division Multiplexing (OFDM)-based spatial multiplexing system when considering realistic channel delay profiles. In both the SISO and the MIMO contexts, we compare the deterministic, ergodic and outage capacities for the channel with realistic profile to the one with simplified profile
Date : 2026-01-07 Size : 150kb User : Safa
[Industry research] biyesejitognxinxitong DL : 0: 中文摘要正交频分复用（ OFDM ， Orthogonal Frequency Division Multiplexing）是当前一种非常热门的通信技术。它即可以被看作是一种调制技术，也可以被看作是一种复用技术。由于它具有抗多径衰落和频谱利用率高的特点，因此被广泛应用于高速数字通信领域，比如应用于IEEE 802.11a无线局域网（WLAN）的物理层等等。我的毕业设计的核心任务是：采用 FPGA 来实现一个基于OFDM 技术的通信系统中的基带数据处理部分，即调制解调器。其中发射部分的调制器包括：信道编码（Reed-Solomon 编码），交织，星座映射，FFT和插入循环前缀等模块。我另外制作了相应的解调器，可以实现上述功能的逆变换。另外，我还对OFDM技术， IEEE 802.11a的标准文献，基于Simulink 的 OFDM 模型和仿真，ALTERA 公司的技术和 IP Core 的使用等方面进行了研究。这些在文章中都有体现。 -Abstract Orthogonal frequency division multiplexing (OFDM, Orthogonal the Frequency Division, Multiplexing) is a very popular communication technology. It can be seen as a Modulation technique can also be seen as a multiplexing technique. Because of its resistance to multipath fading and spectrum High utilization characteristics, and is widely used in high-speed digital communications, such as used in IEEE 802.11a wireless LAN (WLAN) physical layer. The core mission of my graduation project: FPGA to implement a technology based on OFDM Communication systems in baseband data processing part, ie the modem. These emission part of the modulation Includes: channel coding (Reed-Solomon coding), interleaving, constellation mapping, FFT and interpolation Into the cyclic prefix modules. I also produced a corresponding demodulator can achieve the inverse of the above functions Transformation. In addition, OFDM technology, the IEEE 802.11a standard literature, based on Simulink
Date : 2026-01-07 Size : 1.48mb User : 万利
[Industry research] 1123 DL : 0: 基于导频的OFDM信道估计的硕士论文一篇，研究信道估计的各种方法-OFDM channel estimation based on pilot master' s thesis a study of channel estimation the various methods
Date : 2026-01-07 Size : 58kb User : 蓝波
[Industry research] 1345 DL : 0: 基于导频的MIMO-OFDM信道估计算法研究，给出信道估计及导频插法不同情况的性能研究-Pilot-based MIMO-OFDM channel estimation algorithm, given the performance of channel estimation and pilot interpolation
Date : 2026-01-07 Size : 790kb User : 蓝波
[Industry research] MIMO-OFDM DL : 0: Perfomance of MIMO - OFDM in AWGN channel
Date : 2026-01-07 Size : 941kb User : zfrl18
[Industry research] 2 DL : 0: Channel estimation for mobile OFDM systems requires transmission of pilot tones. This paper addressesthe important issue of selecting these pilot tones, so as to achieve a good quality estimate. It is shown that the best set of tones to be used are those which are equally spaced. F
Date : 2026-01-07 Size : 602kb User : archana
[Industry research] 17vol2no2 DL : 0: The objective of this study is improving channel estimation accuracy in OFDM system because channel state information is required for signal detection at receiver and its accuracy affects the overall performance of system and it is essential to improve the channel estimation for more reliable communications. OFDM system was chosen in this study because it has been widely used today due to its high data rate, channel capacity andits adequate performance in frequency selective fadingchannels .
Date : 2026-01-07 Size : 361kb User : archana
[Industry research] 553-1504-1-PB DL : 0: Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier modulation and multiplexing technique proposed for 3G, 4G LTE-A systems to achieve higher data rates with better spectral efficiency at low latency. Time varying nature of the wireless channel can cause frequency selectivity and multipath fading which affects performance of the system badly.
Date : 2026-01-07 Size : 151kb User : archana
[Industry research] 1111cnc03_2 DL : 0: Multicarrier modulations attract a lot of attention ranging from wireline to wireless communications compared to single carrier modulation because of theirs capability to efficiently cope with frequency selective fading channels. Much of attention in the present literature emphasizes on the use of conventional OFDM, which is able to avoid both inter - symbol interference (ISI) and inter - channel interference (ICI) making use of a suitable cyclic prefix.
Date : 2026-01-07 Size : 179kb User : archana
[Industry research] ofdm DL : 0: OFDM channel Using a large number of parallel narrow-band subcarriers instead of a single wide-band carrier to transport information l Advantages » Very easy and efficient in dealing with multi-path » Robust again narrow-band interference -OFDM channel Using a large number of parallel narrow-band subcarriers instead of a single wide-band carrier to transport information l Advantages » Very easy and efficient in dealing with multi-path » Robust again narrow-band interference
Date : 2026-01-07 Size : 1.56mb User : ajay
[Industry research] Interference Analysis and Mitigation for Time-Asynchronous OFDM CoMP Systems DL : 0: One of the major challenges which prevents the coordinated multipoint (CoMP) communications concept from being widely deployed in new cellular systems is timing synchronization. In order to achieve the gains promised by CoMP systems, the user equipments’ (UEs) signals in uplink (UL) or the base stations’ (BSs) signals in downlink (DL) should be synchronized such that the time difference of arrivals (TDOAs) do not exceed the cyclic prefix (CP) length of the transmitted signals; Otherwise the system suffers from unavoidable integer time offsets. These offsets lead to asynchronous interference in terms of inter-carrier, inter-block and inter-symbol interference (ISI). This limits the percentage of area within a cell which can be covered by cooperation and imposes an upper bound on this area. In this paper, we investigate this problem in the UL and by using geometrical and semi-analytical approaches, we define this upper bound. Also, by characterizing an accurate mathematical model for the asynchronous interference in Rayleigh fading channels, we were be able to employ a standard MMSE-based receiver that mitigates this interference. Furthermore, a typical joint channel and delay estimation block is incorporated into the receiver to examine its performance with estimation errors.
Date : 2021-04-17 Size : 1.78mb User : ahamza