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MIMO Techniques for Mobile WiMAX Systems
White Papers It turns out that implementing a 2x2 spatial multiplexing MIMO receiver is a considerable challenge with a present state of technology. The WiMAX standard includes many different features and options to make the best use of the wireless channel...
[April 23, 2009, 1:24]
MIMO brings 400Mbps Wi-Fi closer
News The key to such high speeds is MIMO multiple antenna technology, a wireless standard that offers faster speeds by sending information across multiple data streams. MIMO takes advantage of multi-path distortion, which occurs when Wi-Fi radio signals...
[October 3, 2005, 13:40]
MIMO and Smart Antenna Techniques for 802.11a/b/g
White Papers The .11n proposals have centered on a wireless technology called MIMO (Multiple-In, Multiple-Out), and proprietary MIMO chipsets are already available in the market for experimentation. Convenience and affordability have made Wi-Fi the dominant...
[August 26, 2006, 1:00]
MIMO in 3G Cellular Systems: Challenges and Future Directions
White Papers The multidimensional MIMO channel can be exploited to increase the diversity of the system or to provide parallel spatial channels, which is known as spatial multiplexing. Diversity is generally considered lower risk, and a well-known example is...
[October 11, 2005, 3:00]
Qualcomm buys into MIMO wireless technology
News Qualcomm has acquired a key player in the next era of wireless connectivity, MIMO pioneer Airgo. MIMO — multiple input / multiple output — is central to upcoming technologies such as mobile WiMax and the 802.11n Wi-Fi standard, as well as the long...
[December 4, 2006, 16:36]
Rapid MIMO-OFDM Software Defined Radio System Prototyping
White Papers Multiple Input-Multiple Output (MIMO) is an attractive technology for future wireless systems. MIMO communication, enabled by the use of multiple transmit and multiple receive antennas, is known for its high spectral efficiency as well as its...
[August 10, 2007, 11:00]
Spatial Multiplexing for Outdoor MIMO-OFDM Systems With Limited Feedback Constraint
White Papers 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...
[April 11, 2007, 1:01]
Using MIMO-OFDM Technology to Boost Wireless LAN Performance Today
White Papers This White Paper describes how MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) technology delivers significant performance improvements for wireless LANs, enabling them to serve existing applications more cost...
[January 30, 2009, 9:48]
Interpolation Based Transmit Beamforming for MIMO-OFDM With Limited Feedback
White Papers Transmit beamforming and receive combining are simple methods for exploiting spatial diversity in Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) system. Optimal beamforming requires channel state information...
[April 11, 2007, 1:01]
Quantized Multi-Mode Precoding for Spatial Multiplexing MIMO-OFDM Systems
White Papers Spatial multiplexing with multi-mode precoding can achieve both high capacity and high reliability in Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems. Multimode precoding uses linear transmit precoding but adapts the...
[April 11, 2007, 1:01]
Efficient MIMO Equalization for Downlink Multi-Code CDMA: Complexity Optimization and Comparative Study
White Papers This paper presents an efficient LMMSE chip equalizer to suppress the interference caused by the multipath fading channel in the MIMO Multi-Code CDMA downlink. The block-Toeplitz structure in the correlation matrix is approximated with a block...
[August 26, 2009, 1:20]
A MIMO-OFDM Prototype for Next-Generation Wireless WANs
White Papers Coupled with a robust and efficient OFDM air interface, MIMO technologies lead to a very compelling high-speed data downlink solution for future wireless systems. This paper presents Nortel Networks' MIMO-OFDM concept prototype and measured...
[January 8, 2008, 1:37]
An Efficient Circulant MIMO Equalizer for CDMA Downlink: Algorithm and VLSI Architecture
White Papers MIMO (Multiple Input Multiple Output) technology using multiple antennas at both the transmitter and receiver has emerged as one of the most significant technical breakthroughs for throughput enhancement.
[October 6, 2005, 3:00]
Comparison of Vector Detection Algorithms for MIMO-OFDM
White Papers The aim of this paper is to compare detection algorithms for MIMO-OFDM transmissions by simulation. Moreover, iterative equalization techniques based on soft interference cancellation connected with decoding via the well-known turbo principle can...
[April 11, 2007, 1:01]
On MIMO Signal Processing for Adaptive W-CDMA and OFDM Wireless Transceivers
White Papers This paper considers wideband extensions of narrowband signal processing techniques for MIMO wireless transceivers. The extensions are applied and analyzed on commonly used wideband systems such as W-CDMA and OFDM.
[July 21, 2005, 6:00]
Estimation of Carrier-Frequency Offset and Frequency-Selective Channels in MIMO OFDM Systems Using a Common Training Signal
White Papers This paper presents a common training signal design and corresponding estimation methods for carrier frequency offset and frequency-selective channels in MIMO OFDM systems. In designing the common training signal, a training signal structure which...
[April 13, 2007, 1:01]
Multiband-OFDM MIMO Coding Framework for UWB Communication Systems
White Papers In order to satisfy the growing demand for higher data rates, one possible solution is to exploit both spatial and multipath diversities via the use of Multiple-Input Multiple-Output (MIMO) and proper coding techniques.
[April 13, 2007, 1:01]
A Space-Time Receiver for MIMO-OFDM Ad Hoc Networks
White Papers This paper proposes a receiver architecture that can demodulate multiple data streams with different frequency offsets and propagation delays in Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) ad hoc networks.
[April 26, 2007, 1:00]
ASIC Implementation of a MIMO-OFDM Transceiver for 192 Mbps WLANs
White Papers This paper presents, to the best of the authors' knowledge, the first 4 × 4 MIMO-OFDM WLAN physical layer ASIC based on the OFDM specifications of the IEEE 802.11a standard. Next generation Wireless Local Area Networks (WLANs) such as the IEEE...
[February 17, 2006, 0:01]
Performance of MIMO OFDM Systems in Fading Channels With Additive TX and RX Impairments
White Papers To gain a better understanding of the influence of these impairments on the performance of multiple antenna OFDM systems, this paper studies a zero-forcing based MIMO OFDM system with imperfections modeled as additive error sources in both...
[July 21, 2005, 0:00]
