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Point-to-Point Transmission Over MIMO Channels With Intersymbol Interference: Comparison of Single- and Multicarrier Modulation
White Papers In MIMO orthogonal frequency division multiplexing, temporal equalization is performed by applying OFDM, which decomposes the MIMO ISI channel into a set of independent flat fading MIMO channels. For each of this parallel channels (the carriers...
[March 30, 2005, 3:00]
Expected Data Rate: An Accurate High-Throughput Path Metric for Multi-Hop Wireless Routing
White Papers The metric is based upon a new model for transmission interference which is a critical factor in determining path throughput. This paper constructs a realistic and practical transmission interference model by determining transmission contention...
[August 23, 2007, 1:00]
Efficient Interference-Aware TDMA Link Scheduling for Static Wireless Networks
White Papers Unlike the previous studies that often assume a unit disk graph model, the paper assumes that different terminals could have different transmission ranges and different interference ranges. In the model, it is also possible that a communication...
[August 10, 2007, 10:45]
How to Outperform IEEE 802.11: Interference Aware (IA) MAC
White Papers This paper proposes Interference Aware (IA) MAC, a modified version of standard IEEE802.11. To make it feasible, the paper proposes to insert some information about interference and received power levels into IEEE 802.11 control packets.
[May 12, 2006, 0:00]
Interference Avoidance Dynamic Adaptive OFDM Using a Reconfigurable Radio Platform
White Papers The main focus of this work is the creation of a receiver-centric improved OFDM wireless transmission system that has reduced Bit Error Rate (BER) and increased channel capacity usage in interference-prone wireless bands.
[April 11, 2007, 1:01]
Drowning in wireless spaghetti
News Each decision affects a number of factors: power consumption, how many transmitters can operate in a particular area, how far the transmission reaches, how resistant a signal is to interference, how much data can be carried, how easy it is to...
[November 1, 2005, 12:00]
Why 802.11n is a hard act to swallow review
Reviews The 5GHz 802.11a and 2.4GHz 802.11g standards use techniques where the radio spectrum is divided up into multiple parallel transmission channels, with particular care taken to avoid interference between adjacent channels and to divide the data...
[November 21, 2006, 7:46]
Catch the new wave in wireless networking: 802.11n review
Reviews Today's Wi-Fi gear has limited range, is highly susceptible to interference from cordless phones and other wireless devices, and is much slower than old-fashioned Ethernet. Other sources of interference, such as cordless phones, microwave ovens...
[May 3, 2005, 12:05]
Exploring the Effect of Inter-Flow Interference on TCP Performance in MANETs
White Papers Research efforts in MANETs have concentrated on smoothing TCP incompatibilities with the IEEE 802.11 protocol due to the degrading effects of hidden terminals caused by transmission interference. Previous studies which have focused on solutions at...
[December 20, 2007, 0:01]
A ML Based Estimation of the Doppler Shift of MIMO WiMAX Systems
White Papers However, due to the multipath transmission and Multiple Access Interference (MAI), the performance of the WiMAX system will be degraded. WiMAX systems whose data rate can be up to 50 Mbps are the most promised wireless communication systems.
[April 23, 2009, 1:24]
Interference-Aware Topology Control for Wireless Sensor Networks
White Papers Some researchers tried to indirectly reduce the interference by reducing the transmission power or by devising low degree topologies, but none of those protocols can guarantee low interference. However, only a few topology control methods take into...
[April 23, 2009, 1:24]
Low-Complexity Time-Domain ICI Equalization for OFDM Communications Over Rapidly Varying Channels
White Papers Here, InterCarrier Interference (ICI) is the major source of impairment that limits the transmission quality. This paper considers wireless OFDM communications over rapidly varying channels as occurring e.g.in high-mobility scenarios.
[April 11, 2007, 1:01]
Joint Power-Playout Control for Media Streaming Over Wireless Links
White Papers This paper seeks to improve the performance of media streaming over an interference-limited wireless link, by using appropriate transmission and playout control. Media streaming applications over wireless links face various challenges, due to both...
[February 1, 2009, 0:00]
Distributed Cognitive Coexistence of 802.15.4 With 802.11
White Papers Those networks have very different transmission characteristics that result in asymmetric interference patterns. Interoperability and coexistence between these heterogeneous networks are becoming key issues, which require new adaptation strategies...
[May 12, 2006, 1:00]
Blind and Semiblind Spatio-Temporal Diversity for OFDM Systems
White Papers This algorithm may cope well with non-stationary interference that appears during the burst transmission. A blind method is firstly proposed for the maximization of the temporal Signal to Noise plus Interference Ratio (SNIR) in frequency selective...
[April 14, 2007, 1:01]
A MAC Protocol for Ad-Hoc Underwater Acoustic Sensor Networks
White Papers To do so, it relies on a receiver's ability to tolerate a certain level of interference. By minimizing the length of the hand-shake procedure preceding the data transmission, the throughput efficiency is increased as compared to the previously...
[April 23, 2009, 1:24]
Comparison of Vector Detection Algorithms for MIMO-OFDM
White Papers Moreover, iterative equalization techniques based on soft interference cancellation connected with decoding via the well-known turbo principle can approach the matched filter bound for the 4 × 4 MIMO channels used in the simulation.
[April 11, 2007, 1:01]
Performance Improvement of Bluetooth in the Presence of WLAN DS 802.11
White Papers In this paper, a systematic analysis is presented to calculate the frame error rate in the Bluetooth systems impaired by electromagnetic interference (EMI) from Wireless LAN transmissions. The effects of EM radiation from the Wireless LAN system in...
[November 30, 2005, 0:00]
Performance Enhancing Proxy for Interactive 3G Network Gaming
White Papers Further complicating the timely game data delivery problem is the frequent packet drops at these links due to inter-symbol interference, fading and shadowing at the physical layer. Yet the inherently large transmission delay mean and variance of 3G...
[January 7, 2007, 0:00]
Phase Noise Suppression in OFDM Using a Kalman Filter
White Papers Phase noise causes constellation rotation, the so called Common Phase Error (CPE), and InterCarrier Interference (ICI). A method for calculating power of ICI needed for EKF operation but also important in general for the characterization of phase...
[April 18, 2007, 1:00]
