mimo technique

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MIMO: From Theory to Reality

Driven by the even growing demand of higher data rate with the scarce spectrum resource, the theoretical breakthrough has been made and demonstrated significant increase on channel capacity spectral efficiency over MIMO systems. The theoretical MIMO spectral efficiency is verified by MIMO channel measurements and trial systems. Two MIMO mechanisms...

Tags: Theory, MIMO, CodioLink, MIMO Technique

White papers 2009-07-01

Additional Resources

Multi-User Adaptive Resource Allocation Scheme for WLAN OFDM-MIMO Transmission

Orthogonal Frequency Division Multiplexing OFDM has recently been proposed for use in high data-rate wireless systems. OFDM has an important property of spectrum utilization technique that distributes each tone, which is orthogonal with every other tone. The system capacity can be significantly improved by multiple transmit and receive antennas that...

Tags: WLAN, MIMO, Allocation, Wireless, PSG College Of Technology, OFDM, Wireless LANs, LANs, Wi-Fi, Wireless And Mobility, Networking

White papers 2008-08-25

An Analysis of the Benefits of Uplink MIMO in Mobile WiMAX Systems

This paper discusses the improvements that uplink MIMO brings to Mobile WiMAX network deployments and introduces a new technique based on uplink MIMO, tile switched diversity TSD. Uplink MIMO (UL-MIMO) provides extended coverage (up to 41 percent cell radius increase), and can also be used to reduce power consumption (to...

Tags: Mobile, Benefit, MIMO, Analysis, Sequans, WiMAX, Advertising & Promotion, Wireless And Mobility, Marketing

White papers 2008-06-01

A ML Based Estimation of the Doppler Shift of MIMO WiMAX Systems

WiMAX systems whose data rate can be up to 50 Mbps are the most promised wireless communication systems. However, due to the multipath transmission and Multiple Access Interference MAI, the performance of the WiMAX system will be degraded. The advanced technique, Multiple Inputs Multiple Outputs MIMO is proposed to improve...

Tags: Frequency, Performance, MIMO, WiMAX, Wi-Fi, Wireless And Mobility

White papers 2008-05-27

802.11n - The consequences of abandoning the 5 GHz frontier

When 802.11b first started getting popular in late 2000, no one imagined that it would still be the most dominant standard 6 years later and continue to dictate the design of the latest wireless LAN products because it is the lowest common denominator. As with any technology that is...

Tags: Infrastructure, Mobile/Wireless, Networking, News, Hardware, IEEE 802.11

Blog posts 2007-01-24

Transmit Optimization for MIMO-OFDM With Delay-Constrained and No-Delay-Constrained Traffic

This paper studies low-complexity power control schemes to approach the capacity limits of Multiple-Input Multiple-Output Orthogonal-Frequency-Division-Multiplexing (MIMO-OFDM) channels under the assumption that perfect Channel State Information CSI is available at both the transmitter and the receiver. Two notions of channel capacity limit are considered, namely, the ergodic capacity for variable-rate...

Tags: Optimization, Capacity, MIMO-OFDM

White papers 2006-08-01

Spatial Multiplexing for Outdoor MIMO-OFDM Systems With Limited Feedback Constraint

This paper proposes a spatial multiplexing technique for the downlink of a Multiple-Input-Multiple-Output MIMO Orthogonal-Frequency-Division-Multiplexing OFDM system. For outdoor environments with a limited angular spread at the base station, the proposed technique is able to separate the users' streams through a joint spatial processing at both the transmitter and the...

Tags: Technique, Uppsala University, MIMO-OFDM, Productivity, OFDM, Wireless

White papers 2006-02-22

Adaptive Channel SVD Estimation for MIMO-OFDM Systems

In this paper an adaptive estimation algorithm for channel matrix singular value decomposition SVD in multiple-input multiple-output MIMO orthogonal frequency division multiplexing OFDM systems is proposed. The SVD method is an efficient approach to design space-time coding/decoding and detection algorithms in MIMO-OFDM systems. However, the SVD estimation may involve complex...

Tags: Algorithm, MIMO-OFDM, University Of Toronto, Singular Value Decomposition Method, OFDM, Engineering, Wireless

White papers 2005-05-07

Channel Capacity of TDD-OFDM-MIMO for Multiple Access Points in a Wireless Single-Frequency-Network

The Multiple-Input-Multiple-Output MIMO technique is the most attractive candidate to improve the spectrum efficiency in the next generation wire-less communication systems. However, the efficiency of MIMO techniques reduces in the Line Of Sight LOS environments. This paper proposes a new MIMO data transmission scheme, which combines Single-Frequency-Network SFN with TDD-OFDM-MIMO...

Tags: Environment, MIMO, Springer Science+Business Media, Access Point, Channel Capacity, Productivity, Wireless

White papers 2005-04-28

Orthogonal Frequency Division Multiplexing for Wireless Communications

Orthogonal frequency division multiplexing OFDM is a promising technique for high-data-rate wireless communications because it can combat inter-symbol interference ISI caused by the dispersive fading of wireless channels. The proposed research focuses on techniques that improve the performance of OFDM based wireless communications and its commercial and military applications. In...

Tags: Wireless Communication, OFDM, Wi-Fi, Wireless

White papers 2004-11-16

Performance of Joint Detection Techniques for Coded MIMO-OFDM and MIMO-MC-CDM

This paper considers a coded transmission over a time-invariant MIMO channel where channel state information is present at the receiver but not at the transmitter. As basic modulation technique OFDM is applied. This paper investigates the performance of the system when spreading in frequency direction is included additionally (MC-CDM). In...

Tags: Technique, Performance, MIMO-OFDM, Universität Ulm, Productivity, OFDM, Performance Management, Wireless, Human Resources, Workforce Management

White papers 2003-05-21