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The conventional algorithm of channel estimation based on IEEE802.11ac is Least Square (LS) algorithm, which uses the Very High Throughput-Long Training Field (VHTLTF) of frame header as training sequence. While the conventional algorithm does not take into account the effects of noise and the varying characteristics of channel in time domain. In order to describe the slow change of channel in time...
IEEE802.11ac is a 5GHz based very high throughput (VHT) wireless local area network (WLAN) standard with superior performance at channel capacity and transmission rate due to accurate channel estimation. Traditionally, the channel state information (CSI) of data field is obtained via training sequence in time domain such as VHI-LTF, which performs weakly in non-flat and slow fading channel. This paper...
Employing MIMO-OFDM architecture in the next generation of CMMB systems offers the potential to obtain higher spectral efficiency as well as diversity gain. In particular, a low-complexity effective strategy for transmission scheme based on parallel SFBC design is realized, while the data rate is the same as the traditional SFBC system. At the receiver, the time-frequency joint LMMSE wiener filtering...
It is well known that MIMO-OFDM technology can improve the diversity gain and system capacity, increase spectrum efficiency and overcome frequency selective fading. However, few MIMO testbeds or prototypes have been considered for CMMB standards. In this work, we present a novel 2×2 MIMO structure for CMMB system. A parallel Alamouti coding is designed to decrease the complexity of MIMO implementation...
Employing MIMO architecture in the next generation of various broadcasting systems offers the potential to obtain higher spectral efficiency as well as diversity gain. This Letter presents the experimental step of a project aimed at the implementation of a 2×2 MIMO-OFDM architecture to improve reliability and capacity, respectively, for wireless communications. The design of SFBC are proposed for...
Proposed is a novel Orthogonal Procrustes (OP) based semi-blind channel estimation method for multi-input, multi-output (MIMO) systems. The main idea of our technique is, using specific properties of the OP algorithm, to estimate the optimum rotation matrix from channel matrix instead of to estimate channel parameters directly. This results in substantially improved estimation accuracy. Furthermore,...
In this paper, we investigate a 2-way assignment routing method to minimize the entire system power consumption in multi-hop relaying networks. Using the presented routing calculation, an efficient feedback scheme is introduced and only the backward accumulated feedback metrics are required. Compared with the traditional centralized minimum power routing requiring the full channel information, the...
In this paper we investigate the channel estimation and data transmission scheme for bi-directional relaying applied in cellular systems. We propose a novel pilot-aided transmission strategy to realize the efficient data exchange between Base Station (BS) and Mobile Station (MS) via a fixed Relay Node (RN). Based on the characteristics of the BS-RN link, the transmitted signals at the BS are pre-equalized...
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