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In this paper we propose a robust channel estimator for Long Term Evolution (LTE) downlink highly selective using neural network. This method uses the information provided by the reference signals to estimate the total frequency response of the channel in two phases. In the first phase, the proposed method learns to adapt to the channel variations, and in the second phase it predicts the channel parameters...
The LOS components of the base station (BS) can provide a high SNR to mobile stations (MSs), but they cannot achieve a high spatial multiplexing gain in the MIMO-OFDMA system. The spatial multiplexing gain is obtained by degrees of freedom between MIMO antenna arrays. MIMO channels should be uncorrelated to achieve the maximum degrees of freedom, and it depends on rich scattering environments which...
This paper discusses about RTL design of time domain auto-correlation architecture for two recent standards, i.e.Worldwide Interoperability for Microwave Access Orthogonal Frequency Division Multiple Access (WiMAX OFDMA) and 3rd Generation Partnership Project Long Term Evolution (3GPP LTE). We introduce time domain auto-correlation function to recognize WiMAX preamble and LTE primary synchronization...
TCP's downlink performance during FMIPv6-enabled IEEE802.11g handoff is examined. The use of a user-initiated Handoff Notification, sent prior to handoff, is proposed. Therefore, the correspondent node is aware of the handoff-induced disruption, hence avoiding dropping the congestion window size and triggering Fast Retransmission mechanisms. During handoff, it continues to send data packets which...
Inter-cell interference coordination (ICIC) is one of the key technologies in the multi-cell radio resource management of mobile systems. It plays a vital role in mitigating strong inter cell interference and guaranteeing proper quality of services for in-progress sessions. Because heterogeneous deployment is adopted in LTE-Advanced, and interference problem becomes serious. In this paper, we propose...
The introduction of an uplink channel providing fast quality indication feedback on shared channels can improve packet data throughput in existing TDMA systems. It is shown that the uplink interference produced by this feedback channel is more than compensated by multi-user diversity gain.
We consider a wireless downlink network with a single base-station, N mobile users and L shared on-off channels. Each mobile user receives a downlink traffic flow from the base-station where a separate queue is maintained for each flow. In this multi-channel downlink network, throughput-optimal scheduling algorithms such as the MaxWeight scheduling require the complete channel state information (i...
It is well-known that TCP connections perform poorly over wireless links due to channel fading. To combat this, techniques have been proposed where channel quality feedback is sent to the source, and the source utilizes coding techniques to adapt to the channel state. However, the round-trip time-scales quite often are mismatched to the channel-change time-scale, thus rendering these techniques to...
Interest in broadband wireless access (BWA) has been growing due to increased user mobility and the need for data access at all times. IEEE 802.16e based WiMAX networks promise the best available quality of experience for mobile data service users. Unlike wireless LANs, WiMAX networks incorporate several quality of service (QoS) mechanisms at the Media Access Control (MAC) level for guaranteed services...
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