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MIMO (83 results)
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- Optimal Training Signals for MIMO OFDM Channel Estimation in the Presence of Frequency Offset and Phase Noise
- 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 and simulation results for the frequency-offset and PN effects on channel estimation. The proposed designs are more advantageous for moderate-to-high values of...
- White papers 2006-10-01
- Linear Precoding for Multiuser MIMO-OFDM Systems
- This paper develops linear precoding schemes for the downlink in multiuser Multiple-Input Multiple-Output MIMO Orthogonal Frequency Division Multiplexing OFDM systems with multiple data streams per user. The authors extend an existing multiuser MIMO algorithm, that jointly optimizes the power allocation and the transmit and receive filters, to MIMOOFDM systems. One...
- White papers 2006-09-28
- Performance of Antenna Selection for MIMO-OFDM Systems Based on Measured Indoor Correlated Frequency Selective Channels
- This paper presents and compares antenna selection strategies for frequency selective MIMO-OFDM channels. Real channels are measured, and used to evaluate performance. Results for simulated TGn channel models are also presented. The paper shows that the capacity gain predicted from the simulated channels, is significantly lower than can be achieved...
- White papers 2006-08-14
- 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...
- White papers 2006-08-01
- Rapid MIMO-OFDM Software Defined Radio System Prototyping
- 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 robustness against fading and interference. Combining MIMO with Orthogonal Frequency Division Multiplexing OFDM, it...
- White papers 2006-06-20
- On the Use of Adaptive Loading Algorithms in MIMO-OFDM Systems
- In this paper, Optimum adaptive loading algorithms are applied to Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing MIMOOFDM system. Chaw's and Compello's algorithms have been implemented to obtain a bit and power allocation for each subcarrier assuming instantaneous channel knowledge. Channel matrix Singular Value Decomposition SVD method has been employed in...
- White papers 2006-04-19
- Compress-and-Forward Cooperative Relaying in MIMO-OFDM Systems
- This paper investigates the capacity of Compress-and-Forward (C&F) cooperative relaying scheme when the C&F relay operates in Time Division Duplex TDD. In the evaluation it considers MIMO-OFDM transmission. An achievable rate was previously derived in assuming scalar channel. This paper extends this Wyner-Ziv bound to MIMO-OFDM, by applying results from...
- White papers 2006-04-13
- 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...
- White papers 2006-02-22
- Design of a MIMO-OFDM Baseband Receiver for Next-Generation Wireless LAN
- In this paper, based on the IEEE 802.11n proposal, a MIMO-OFDM baseband receiver design for next-generation WLAN is proposed. A MIMO-OFDM receiver with algorithms for timing and frequency synchronization and MIMO detection is designed and simulated. Moreover, the circuits for all functional blocks in the receiver are also designed. Functional...
- White papers 2006-02-12
- Reconfigurable Antenna Solution for MIMO-OFDM Systems
- A reconfigurable microstrip dipole antenna solution for Multiple Input Multiple Output MIMO communication systems making use of Orthogonal Frequency Division Multiplexing OFDM is presented. When applied to closely spaced antenna arrays, this method can increase link capacity. The benefits of this novel antenna solution are demonstrated by channel capacity measurements...
- White papers 2006-01-23
- A Software and Hardware Evaluation of Revolutionary Turbo MIMO OFDM Schemes for 5GHz WLANs
- Globally, WLANs operating in the 5GHz band have been standardized by the IEEE North America, ETSI Europe and ARIB Japan. A harmonized physical layer is specified offering up to 54 Mbits/s using rate adaptive Coded Orthogonal Frequency Division Multiplexing COFDM. Multiple Input Multiple Output MIMO antenna architectures coupled with Soft...
- White papers 2005-08-01
- Using MIMO-OFDM Technology to Boost Wireless LAN Performance Today
- 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-effectively as well as making new, more demanding applications possible. It also explains how manufacturers and end-users can profit by deploying MIMO-OFDM...
- White papers 2005-06-01
- ASIC Implementation of a MIMO-OFDM Transceiver for 192 Mbps WLANs
- Next generation Wireless Local Area Networks WLANs such as the IEEE 802.11n standard are expected to rely on multiple antennas at both transmitter and receiver to increase throughput and link reliability. However, these improvements come at a significant increase in signal processing and hence hardware complexity compared to existing single-antenna...
- White papers 2005-05-10
- 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...
- White papers 2005-05-07
- 802.11 Wireless Networks - A Peek Ahead at 802.11n: MIMO OFDM
- 802.11 Task Group N TGn has an interesting goal. Most IEEE task groups focus on increasing the peak throughput, making data fly as fast as possible during the time it is being transmitted. TGn's goal is to achieve 100 Mbps net throughput, after subtracting all the overhead for protocol management...
- Book chapters 2005-04-14
- MIMO-OFDM
- The growing demand of multimedia services and the growth of Internet related contents lead to increasing interest to high speed communications. The requirement for wide bandwidth and flexibility imposes the use of efficient transmission methods that would fit to the characteristics of wideband channels especially in wireless environment where the...
- White papers 2005-02-03
- Interpolation-Based Efficient Matrix Inversion for MIMO-OFDM Receivers
- This paper proposes a new class of computationally efficient algorithms for inverting the channel matrices in zero-forcing MIMO-OFDM receivers. Depending on the number of channel taps and the number of antennas, significant complexity reductions can be realized. For the parameter settings used in the IEEE 802.16 standard, savings of up...
- White papers 2004-12-08
- A MIMO-OFDM Prototype for Next-Generation Wireless WANs
- 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 performance results. This prototype has been developed in the framework of a Nortel Networks system concept...
- White papers 2004-12-01
- Pilot-to-Data Power Ratio for Maximizing the Capacity of MIMO-OFDM
- Orthogonal frequency division multiplexing OFDM can be used with a multiple-input multiple-output MIMO system to improve communication quality and capacity. Pilot-symbol-aided or decision-directed channel estimation must be used to track the variations of the channel. However, while pilot symbols facilitate channel estimation, they reduce the transmit energy for data symbols...
- White papers 2004-11-22
- Throughput of a MIMO OFDM Based WLAN System
- In this paper, the system throughput of a wireless local-area-network WLAN based on multiple-input multiple-output orthogonal frequency division multiplexing MIMO OFDM is studied. A broadband channel model is derived from indoor channel measurements. This model is used in simulations to evaluate the performance of different MIMO detection algorithms. It is...
- White papers 2004-09-29
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