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Frequency-Domain Interference Cancellation For MIMO-OFDM Systems
White Papers This paper proposes a new interference cancellation scheme for multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems in the presence of intersymbol interference (ISI).
[January 1, 1970, 0:59]
Bluetooth Frequency Hop Selection Kernel Impact On "Inter-Piconet" Interference
White Papers This algorithm has been implemented in software to test various aspects of inter-piconet interference. Adjacent channel interference was observed during experimentation. This contradicts previous research, which has assumed that adjacent channel...
[January 1, 1970, 0:59]
A Study Of Frequency Interference And Indoor Location Sensing With 802.11b And Bluetooth Technologies
White Papers Since BT and WLAN don't get along very well, the paper presents experimental results of interference effect of one technology on the other. Several technologies such as infrared sensing, radio frequency, ultrasonic and RFIDs have been proposed for...
[January 1, 1970, 0:59]
Adaptive Frequency Hopping For Reduced Interference Between Bluetooth And Wireless LAN
White Papers To improve performance in these environments, a technique known as Adaptive Frequency Hopping has been introduced by the Bluetooth Special Interest Group (SIG) to diminish the impact of such interference.
[January 1, 1970, 0:59]
Joint Frequency Offset Estimation And Interference Cancellation For MIMO-OFDM Systems
White Papers A new two-stage receiver structure is adopted, which consists of an initial space-time equalization for suppressing the Co-Channel Interference (CCI), shortening the channel, and mitigating a synchronicity followed by parallel equalization and...
[January 1, 1970, 0:59]
Multiuser Interference Cancellation For OFDM Systems With Frequency Offset
White Papers The multiple access interference is reduced by reconstructing and removing the interfering signals. This paper proposes a method to counteract the effect of different frequency offsets of the users in a OFDMA uplink system with frequency selective...
[January 1, 1970, 0:59]
An Impartial Comparison Of Direct-Sequence And Frequency-Hopping Spread Spectrum Performance With ISM-Band Narrowband Interference
White Papers Direct sequence spread spectrum (DSSS) and frequency hopping spread spectrum (FHSS) have different physical mechanisms for rejecting narrowband interference. Because of these physical differences, they perform differently in the presence of the...
[January 1, 1970, 0:59]
Comparison Of Multi-Cell Multi-Antenna CDMA And TDMA Systems
White Papers The interference from another cell sharing the same frequency is calculated, and the total interference arising from the frequency reuse pattern is evaluated. A simple analytical model for the inter-cell interference is developed, which is in good...
[January 1, 1970, 0:59]
Compatibility Of Bluetooth With Other Existing And Proposed Radiocommunication Systems In The 2.45 GHz Frequency Band
White Papers The spectrum needs of Short Range Devices (SRD) are most often allocated into an ISM band on a frequency-sharing basis (non-interference, non-protection basis) and the industry has the advantage of a general license type approval.
[January 1, 1970, 0:59]
Agilent Advanced Design System Helps SiGe Semiconductor Get Virtual Samples To The Marketplace Fast
White Papers When Bluetooth systems were first tested in real-world environments, interference from the crowded frequency band, as well as from static barriers like walls, significantly degraded performance. SiGe Semiconductor recognized this opportunity to use...
[January 1, 1970, 0:59]
Throughput Of Strongly Interfering Slow Frequency-Hopping Networks
White Papers With the increasing use of short-range wireless devices for high-data-rate communication in the shared frequency bands, the level of interference can be expected to increase. The ability to estimate the performance degradation of these devices due...
[January 1, 1970, 0:59]
Reducing Intercarrier Interference In OFDM Systems By Partial Transmit Sequence And Selected Mapping
White Papers We introduce the Peak Interference-to-Carrier Ratio (PICR) to measure the resulting intercarrier interference (ICI). Orthogonal Frequency Division Multiplexing (OFDM) is sensitive to the carrier frequency offset (CFO).
[January 1, 1970, 0:59]
ICI Mitigation For OFDM Mobile Systems
White Papers Orthogonal Frequency Division Multiplexing (OFDM) is robust against Inter-Symbol-Interference (ISI) due to the increase of the symbol duration. However, for mobile applications, channel variations during one OFDM frame introduce Inter-Carrier...
[January 1, 1970, 0:59]
Blind And Semiblind Spatio-Temporal Diversity For OFDM Systems
White Papers A blind method is firstly proposed for the maximization of the temporal Signal to Noise plus Interference Ratio (SNIR) in frequency selective channels exploiting the temporal redundancy introduced by the Cyclic Prefix (CP).
[January 1, 1970, 0:59]
Space-Time Interference Cancellation In MIMO-OFDM Systems
White Papers In this paper, a two stage hybrid interference cancellation and equalization framework is proposed for interference cancellation in the uplink of Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems.
[January 1, 1970, 0:59]
Per-Tone Equalization For OFDM Over Doubly-Selective Channels
White Papers It considers the most general case, where the doubly-selective channel delay spread is larger than the cyclic prefix (CP), which results into inter-block interference (IBI). IBI in conjunction with the Doppler effect destroys the orthogonality...
[January 1, 1970, 0:59]
Reactive Cognitive Radio Algorithms For Co-Existence Between IEEE 802.11b And 802.16a Networks
White Papers In particular, a system model is developed in which the two wireless systems share radio resources in frequency, space and time, and reactive coordination methods are used to reduce the mutual interference and improve link throughput.
[January 1, 1970, 0:59]
Space-Time Block-Coded OFDMA With Linear Precoding For Multirate Services
White Papers Relying on space-time linearly precoded orthogonal frequency-division multiple access (OFDMA) and exploiting both transmit and receive antenna diversity, this paper designs herein multirate transceivers that guarantee deterministic symbol recovery...
[January 1, 1970, 0:59]
A Simple Generalization Of The CDMA Reverse Link Pole Capacity Formula
White Papers The generalization quantifies a cost associated with in-cell interference by accounting for the lack of interference from the desired user on the total interference and by considering the impact of the frequency reuse number on the out-of cell...
[January 1, 1970, 0:59]
Spreading Sequences Selection For Uplink And Downlink MC-CDMA Systems
White Papers Combining Orthogonal Frequency Division Multiplex (OFDM) modulation and CDMA, this scheme benefits from the main advantages of both techniques: high spectral efficiency, multiple access capabilities, robustness in the case of frequency selective...
[January 1, 1970, 0:59]
