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BER versus OSNR curve at different receiver optical power (ROP) can be accurately predicted from simple BER versus ROP measurement. Furthermore, OSNR is estimated from pre-FEC BER at different ROP level.
To meet the ever-increasing data traffic demand, heterogeneous cellular networks (HCNs) are to be deployed for wireless communication and coordinated multipoint (CoMP) is thought to be desirable to further improve the performance of HCNs. This paper considers the problem of base station (BS) cooperation in the downlink of HCNs. A novel and flexible cross-tier cooperative scheme is proposed in the...
We investigate three EDFA only amplification architectures for 100G unrepeatered transmission. With > 4 dBQ margin, pre-amplifier only, booster only and both booster and pre-amplifier amplifications can achieve 130, 150 and 220 km reach respectively.
As everyone knows, the energy of signals diminishes with increasing distance, so users at the edge of hexagon cells have lower signal-to-noise ratio (SNR) than users at the center, which means they are more easily interfered by signals from other base stations. So we consider the application of relay to the cellular case to help users at the edge to eliminate interferences and obtain higher sum-rate...
This paper proposes a codebook-based precoding method for multiple-input multiple-output (MIMO) amplify-and-forward (AF) relaying system. The proposed codeword selection criterion is a distributed codeword selection criterion which allows base station and relay to choose optimal precoding matrix independently. Therefore the feedback delay is decreased. Based on the proposed criterion, we further develop...
The aim of this work is the performance evaluation for a method used to analyze of a mono-component linear frequency modulation (LFM) signal, based on the quadratic phase function of the signal. A closed form is found for the output signal to noise ratio. The parameter selection problems of the algorithm are also discussed. Thresholds of the input SNR are presented to guarantee a reasonably accurate...
This paper addresses a novel quasi maximum a posteriori (MAP) estimation algorithm for multiple frequency offsets in distributed multiple inputs and multiple outputs (MIMO) system in the presence of prior information about frequency offsets. In this paper, the prior information is considered and the Cramer-Rao bound (CRB) for the problem at hand is derived. Additionally, taking advantage of prior...
In order to suppress the multi-path interference (MPI) in the DS CDMA system, a new RAKE receiver based on parallel interference elimination is first proposed in this paper: data symbol tentative decision is obtained by linear decision; the multi-path interference are evaluated by tentative decision and known user information. Then the performance over Rayleigh fading channel are analyzed and compared...
This paper addresses maximum a posteriori (MAP) estimation algorithm for multiple frequency offsets in distributed multiple inputs and multiple outputs (MIMO) system in the presence of prior information about frequency offsets. In this paper, the prior information is considered and the Cramer-Rao bound (CRB) for the problem at hand is derived. Additionally, taking advantage of prior information, the...
Performance evaluation method that can compare and analyze different fusion techniques is an essential part in the development of image fusion techniques. This paper mainly discusses the applications and restrictions of performance evaluation metrics such as statistics feature related, information theory related, correlation information entropy, information deviation and etc. Accurate and effective...
A proved affine projection algorithm (APA) is proposed for uplink asynchronous multicarrier code-division multiple-access (MC-CDMA) systems with multipath Rayleigh-fading channel. The proposed technique is totally blind, i.e., the channel estimation of desired user (the spreading code is known) is carried out by subspace separation, which doesn't need the rank estimation in the first step, then the...
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