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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, 0:00]
MIMO-OFDM With Code-Division Multiplexing For V-BLAST Receivers
White Papers In this paper orthogonal frequency-division multiplexing code-division multiplexing (OFDM-CDM) is extended to multiple-input multiple-output (MIMO) systems and a detection scheme called a space-frequency unified vertical-Bell Labs layered space...
[July 26, 2005, 0:00]
MIMO-OFDM Channel Estimation For Correlated Fading Channels
White Papers This paper presents MIMO-OFDM channel estimation for spatially correlated channels using frequency domain estimation techniques. First, the exploitation of spatial correlation on further improving the channel estimates is investigated.
[August 7, 2007, 0:00]
MIMO Technology For Point-to-Point And Multi-User Wireless Communication
White Papers Technology development for Multiple Input Multiple Output (MIMO) wireless communication has undergone significant growth over the past several years. While some research questions remain unanswered related to this topic, for the most part the...
[February 16, 2006, 23:00]
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]
Probably Blinding With MIMO Both Ends But Marginal If LAN Card Still 802.11g
Member Review If (internal) distance is your issue I'd suggest trying MIMO at both ends, but at the current price premium, I may wait until the cost of a 'package' drops or my reasons for purchase are stronger with 'er indoors.
[January 12, 2005, 15:28]
Layered Turbo Space-Time Coded MIMO-OFDM Systems For Time Varying Channels
White Papers A joint detection-estimation scheme is proposed in this paper for multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems. The transmitter employs a layered turbo space-time code.
[March 30, 2005, 0:00]
Optimal Linear Pre-Coder And Power Allocation For MIMO-OFDM Systems With Partial And Imperfect Channel Knowledge
White Papers Multiple input multiple output (MIMO) systems provide dramatic capacity gain through an increased spatial dimension. Thus, to improve MIMO system performance, CSI at the transmitter (CSIT) and receiver (CSIR) should be used efficiently.
[March 30, 2005, 0:00]
A Simple Scalable Space-Frequency Coding Scheme For MIMO-OFDM
White Papers There are several space-time and space-frequency coding schemes proposed in the literature for MIMO-OFDM. This paper presents a linear space-frequency coding scheme based on permutation matrices, that is scalable with number of antennas and spatial...
[July 26, 2005, 0:00]
Lattice-Reduction-Aided Receivers For MIMO-OFDM In Spatial Multiplexing Systems
White Papers Orthogonal Frequency Division Multiplexing (OFDM) significantly reduces receiver complexity in wireless broadband systems and therefore has recently been proposed for use in wireless broadband multi-antenna (MIMO) systems.
[July 26, 2005, 0:00]
LDPC Based Differential Unitary Space-Frequency Coding For MIMO-OFDM Systems
White Papers This paper proposes a novel LDPC based differential unitary space-frequency coding (DUSFC) scheme for MIMO-OFDM systems when neither the transmitter nor the receiver has access to the channel state information (CSI).
[July 26, 2005, 0:00]
Synchronization For MIMO OFDM Systems
White Papers This paper proposes a time and frequency synchronization technique for a Q transmit and L receive (Q X L) MIMO OFDM system. The synchronization is achieved using training symbols which are simultaneously transmitted from Q transmit antennas.
[July 26, 2005, 0:00]
Approaching The Zero-Outage Capacity Of MIMO-OFDM Without Water-Filling
White Papers This paper shows that the full-blown water-filling procedure is not necessary to approach the zero-outage capacity of the MIMO-OFDM channel; it is sufficient instead to use a combination of eigenbeamforming and a fixed (nonadaptive) rate allocation.
[July 26, 2005, 0:00]
Simplified Channel Tracking For MIMO-OFDM Systems
White Papers Multiple-input multiple-output (MIMO) wireless systems can realize large spectral efficiency and high performance communication links. For wideband transmissions, the combination of MIMO systems with orthogonal frequency division multiplexing (OFDM...
[July 26, 2005, 0:00]
High Data Rate MIMO-OFDM System With Orthogonal Delay Diversity Realization
White Papers The delayed orthogonality with respect to frequency tones among different transmitter antennas guarantees to exploit the full spatial and frequency diversity of the frequency-selective multi-input multi-output (MIMO) channel.
[July 26, 2005, 0:00]
A Joint Channel And Channel Length Estimation Algorithm For MIMO-OFDM
White Papers The recent interest in coherently detected MIMO-OFDM systems has fueled research efforts on various channel estimation methods. Few, however, have addressed the practical problem of estimating the instantaneous channel length.
[July 26, 2005, 0:00]
Optimal Training Sequences For Channel Estimation In MIMO OFDM Systems In Mobile Wireless Channels
White Papers This paper describes a channel estimation and tracking scheme for MIMO OFDM systems based on pilot tones. The mean square error of the proposed scheme is derived, and through this optimal training sequences and placement of the pilot tones is derived.
[July 26, 2005, 0:00]
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]
Downlink Multicell MIMO-OFDM: An Architecture For Next Generation Wireless Networks
White Papers This paper considers a multicell MIMO-OFDM TDD system where the emphasis is on the downlink for future data-intensive applications. Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier transmission scheme that is well-recognized for...
[July 26, 2005, 0:00]
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]
