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Space-Frequency Coded MIMO-OFDM With Variable Multiplexing-Diversity Tradeoff
White Papers Space-frequency coded Orthogonal Frequency Division Multiplexing (OFDM) is capable of realizing both spatial and frequency-diversity gains in multipath multiple-input multiple-output (MIMO) fading channels.
[October 26, 2004, 0:00]
On Multiple Accessing For Frequency-Selective MIMO Channels
White Papers This paper focuses on MIMO multiple access channels with frequency-selective fading (spatially correlated at the receiver) assuming perfect channel state information (CSI) in the multiple antenna receiver and no channel knowledge at the multiple...
[March 28, 2005, 0:00]
Noncoherent Space-Frequency Coded MIMO-OFDM
White Papers Recently, the use of coherent space-frequency coding in orthogonal frequency division multiplexing (OFDM)-based frequency-selective multiple-input multiple-output (MIMO) antenna fading channels has been proposed.
[March 28, 2005, 0:00]
A Low Complexity Space-Frequency BICM MIMO-OFDM System For Next-Generation WLANs
White Papers This paper proposes a low complexity Space-Frequency Bit Interleaved Coded (SF-BICM) Multiple-Input Multiple-Output (MIMO) OFDM system as a promising candidate for Next Generation Wireless LANs, expected to operate in excess of 100Mb/s.
[October 21, 2004, 0:00]
Impact Of The Propagation Environment On The Performance Of Space-Frequency Coded MIMO-OFDM
White Papers In this paper, using a broadband MIMO channel model taking into account Ricean K-factor, transmit and receive angle spread, and antenna spacing, we study the impact of the propagation environment on the performance of space-frequency coded MIMO-OFDM.
[October 26, 2004, 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]
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]
Performance Of Space-Frequency Techniques Over Measured Channels In MIMO-OFDM Systems
White Papers This paper examines the performance of some recently proposed Space-time coding and signal processing techniques when applied to Orthogonal Frequency Division Multiplexing (OFDM) in Multiple Input Multiple Output (MIMO) configuration.
[April 11, 2007, 0:00]
Combined Frequency And Time Domain Channel Estimation In Mobile MIMO-OFDM Systems
White Papers This paper proposes a combined frequency and time domain channel estimation method for MIMO OFDM systems. Initial channel estimation is performed by first estimating the channel response in frequency domain, exploiting a set of dedicated pilot...
[August 10, 2007, 0:00]
Channel Capacity Of TDD-OFDM-MIMO For Multiple Access Points In A Wireless Single-Frequency-Network
White Papers This paper proposes a new MIMO data transmission scheme, which combines Single-Frequency-Network (SFN) with TDD-OFDM-MIMO applied for wireless LAN networks. The Multiple-Input-Multiple-Output (MIMO) technique is the most attractive candidate to...
[April 18, 2007, 0:00]
Blind Carrier Frequency Offset Estimation In SISO, MIMO, And Multiuser OFDM Systems
White Papers Relying on a kurtosis-type criterion, a low-complexity blind carrier frequency offset (CFO) estimator is developed for orthogonal frequency-division multiplexing (OFDM) systems. The paper demonstrates analytically how identifiability and...
[March 30, 2005, 0:00]
Space-Frequency Bit-Interleaved Coded Modulation For MIMO-OFDM/OFDMA Systems
White Papers This paper proposes space-frequency bit-interleaved coded modulation (SF-BICM), which provides both frequency diversity and spatial diversity by interleaving coded bits across transmit antennas and frequency tones.
[March 30, 2005, 0:00]
Optimal Training Signals For MIMO OFDM Channel Estimation In The Presence Of Frequency Offset And Phase Noise
White Papers The authors develop robust Mean-Square Error (MSE)-optimal training signal designs for multiple-input multiple-output orthogonal frequency-division multiplexing channel estimation with frequency offset and Phase Noise (PN), and present analytical...
[April 13, 2007, 0:00]
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).
[October 31, 2004, 23:00]
Transmit Optimization For MIMO-OFDM With Delay-Constrained And No-Delay-Constrained Traffic
White Papers 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...
[April 11, 2007, 0:00]
Adaptive MIMO-OFDM Based On Partial Channel State Information
White Papers This paper first provides a partial CSI model for orthogonal frequency division multiplexed (OFDM) transmissions over multi-input multi-output (MIMO) frequency-selective fading channels. The paper then develops an adaptive MIMO-OFDM transmitter by...
[March 30, 2005, 0:00]
Spherical Linear Interpolation For Transmit Beamforming In MIMO-OFDM Systems With Limited Feedback
White Papers Transmit beamforming and receive combining can be simply implemented over frequency selective channels by using Multiple-Input Multiple-Output (MIMO) technology combined with Orthogonal Frequency Division Multiplexing (OFDM) in what is known as...
[April 11, 2007, 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]
Broadband MIMO-OFDM Wireless Communications
White Papers OFDM may be combined with antenna arrays at the transmitter and receiver to increase the diversity gain and/or to enhance the system capacity on time-variant and frequency-selective channels, resulting in a multiple-input multiple-output (MIMO...
[November 1, 2004, 23:00]
Channel Estimation For OFDM Systems With Multiple Transmit Antennas By Exploiting The Properties Of The Discrete Fourier Transform
White Papers This paper addresses channel estimation based on the discrete Fourier transform (DFT) applied to OFDM-based MIMO systems. By exploiting the properties of the DFT, channel estimation schemes for MIMO-OFDM system can be simplified.
[July 26, 2005, 0:00]
