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Compress-and-Forward Cooperative Relaying in MIMO-OFDM Systems
White Paper In the evaluation it considers MIMO-OFDM transmission. This paper extends this Wyner-Ziv bound to MIMO-OFDM, by applying results from Bayesian vector estimation and rate-distortion coding theory. Then the authors derive the mutual information of a... [11 Apr 2008]
Reduced QRD-M Detector in MIMO-OFDM Systems With Partial and Embedded Sorting
White Paper In the second part, the authors present efficient VLSI architectures utilizing the parallelism between subcarriers and design the pipelining in the multi-stage MIMO processing. This paper presents a reduced QRD-M matrix symbol detector in MIMO-OFDM... [13 Apr 2007]
A High-Speed Four-Transmitter Four-Receiver MIMO OFDM Testbed: Experimental Results and Analyses
White Paper To validate the functionality and feasibility of MIMO and OFDM technologies, the authors setup a four-transmitter four-receiver OFDM testbed in a typical indoor environment, which achieves a peak data rate of 525 Mbits/s and a spectral efficiency... [13 Apr 2007]
Channel Estimation for D-BLAST OFDM Systems
White Paper Different from other MIMO-OFDM, where symbols at all tones are always available for decision-directed channel estimation, in D-BLAST OFDM, the authors update estimated channel parameters each time a layer is detected with a Least Square (LS... [13 Apr 2007]
New Approaches to Clipped OFDM Channels: Modeling and Receiver Design
White Paper The paper also shows that a clipped OFDM channel can be considered to be similar to a MIMO channel, with the addition of a clipping indicator vector which indicates which samples are clipped. The authors then present an iterative MMSE receiver... [13 Apr 2007]
Optimal Training Signals for MIMO OFDM Channel Estimation in the Presence of Frequency Offset and Phase Noise
White Paper 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... [13 Apr 2007]
On Performance Limits of MIMO-OFDM Systems Over Block-Fading Channels
White Paper For this purpose, the authors obtain a sphere packing lower bound on average word error probability of space-time-frequency codes. This paper investigates the effect of system parameters on performance limits of space-time-frequency coded OFDM... [13 Apr 2007]
Performance Analysis of Beamforming for MIMO OFDM With BICM
White Paper Furthermore, the authors investigate beamforming in conjunction with next generation Wireless Local Area Networks (WLANs). The authors show that the combination of BICM, single beamforming, and OFDM also leads to the maximum diversity order in... [13 Apr 2007]
Linear Precoding for Multiuser MIMO-OFDM Systems
White Paper The authors extend an existing multiuser MIMO algorithm, that jointly optimizes the power allocation and the transmit and receive filters, to MIMOOFDM systems. This paper develops linear precoding schemes for the downlink in multiuser Multiple... [11 Apr 2007]
Min-SER Space-Time Equalization in Asynchronous MIMO-OFDM Systems
White Paper In this paper, the authors propose an algorithm for the design of space-time equalizer in asynchronous MIMO-OFDM systems. The equalizer is designed to null the co-channel interference and combat asynchronism as well as minimize a lower bound to the... [11 Apr 2007]
Transmit Optimization for MIMO-OFDM With Delay-Constrained and No-Delay-Constrained Traffic
White Paper Let M be the minimum between the number of transmit and receive antennas and N the number of subcarriers, the authors propose a SubChannel Grouping (SCG) technique, which divides the total number of MN space-frequency MIMO-OFDM subchannels into M... [11 Apr 2007]
Slow Subcarrier-Hopped Space Division Multiple Access OFDM Systems
White Paper Space Division Multiple Access (SDMA) assisted Multi-Input-Multi-Output (MIMO) OFDM systems invoking Multi-User Detection (MUD) techniques have attracted substantial research interests, which are capable of exploiting both transmitter multiplexing... [11 Apr 2007]
MIMO OFDM With ST Coding and Beamforming Adapted to Partial CSI
White Paper The authors studies adaptive Multi-Input Multi-Output (MIMO) Space-Time (ST) OFDM transmissions capable of adapting to partial Channel State Information (CSI) that is available at the transmitter. The proposed transmitter includes an outer stage... [11 Apr 2007]
Capacity of Differential Versus Non-Differential Unitary Space-Time Modulation for MIMO Channels
White Paper Differential Unitary Space-Time Modulation (DUSTM) and its earlier nondifferential counterpart, USTM, permit high-throughput MIMO communication entirely without the possession of Channel State Information (CSI) by either the transmitter or the... [12 Dec 2006]
ASIC Implementation of a MIMO-OFDM Transceiver for 192 Mbps WLANs
White Paper 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... [16 Feb 2006]
