multiple systems ofdm
Optimal Training Signals for MIMO OFDM Channel Estimation
White Paper This paper presents general classes of optimal training signals for the estimation of frequency-selective channels in MIMO OFDM systems. Both single and multiple OFDM training symbols are considered. Basic properties of the discrete Fourier... [11 Aug 2008]
Interpolation-Based Multi-Mode Precoding for MIMO-OFDM Systems
White Paper Spatial multiplexing with multi-mode precoding provides a means to achieve both high capacity and high reliability in Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems. [09 Aug 2008]
Multiple Antennae Receive Diversity for Mobile OFDM Systems
White Paper This paper investigates receive diversity for OFDM-based broadband communication systems. It considers the use of multiple antennas to combat time-selective fading and OFDM transmission in combination with an appropriate guard interval to suppress... [03 Jul 2008]
ML Estimation of Timing and Frequency Offset Using Multiple OFDM Symbols in OFDM Systems
White Paper An approach of joint blind estimation of the symbol timing offset and carrier frequency offset using multiple orthogonal frequency-division multiplexing (OFDM) symbols is proposed for OFDM systems in frequency selective fading environment. [03 Jul 2008]
Channel Estimation for OFDM Systems With Multiple Transmit Antennas by Filtering in Time and Frequency
White Paper This paper addresses pilot-symbol aided channel estimation (PACE) for orthogonal frequency division multiplexing (OFDM) based systems, with multiple transmit antennas. An approach is presented which estimates and separates NT superimposed signals... [03 Jul 2008]
Design of Optimum Precoders for Multiple Access OFDM Systems
White Paper This paper considers a multiple access downlink OFDM system having one transmitter antenna and one receiver antenna for which the channel state information (CSI) is known to both ends. For such a system employing minimum mean square error (MMSE... [03 Jul 2008]
On Implementation of Bit-Loading Algorithms for OFDM Systems With Multiple-Input Multiple-Output
White Paper A new implementation scheme for bit-loading algorithms is discussed for orthogonal frequency division multiplexing (OFDM) system with multiple-input multiple-output (MIMO) over wireless transmission channel. [03 Jul 2008]
Channel Estimation for OFDM Systems With Multiple Transmit Antennas by Exploiting the Properties of the Discrete Fourier Transform
White Paper Multi-carrier modulation, in particular orthogonal division frequency multiplexing (OFDM), has been successfully applied to a wide variety of digital communications systems over the past several years. [03 Jul 2008]
Adaptive Loading in MIMO/OFDM Systems
White Paper This paper demonstrates OFDM with adaptive modulation applied to Multiple-Input Multiple-Output (MIMO) systems. Orthogonal Frequency Division Multiplexing (OFDM) is a powerful technique employed in communications systems suffering from frequency... [03 Jul 2008]
Optimal Peak-to-Average Power Ratio Reduction in MIMO-OFDM Systems
White Paper This paper extends the PAR optimization technique to Multiple-Input Multiple-Output (MIMO) OFDM systems with channel precoding. In MIMO systems with a large OFDM symbol size, it is infeasible to solve the optimization problem by direct methods such... [03 Jul 2008]
Antenna Selection for Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing Systems
White Paper This paper addresses the problem of transmit antenna selection for multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems employing spatial multiplexing. The capacity of a wireless communication system can be... [03 Jul 2008]
Why License CommStack's OFDM Modem IP Cores?
White Paper In OFDM systems, the data to be transmitted modulates multiple subcarrier frequencies rather than a single carrier. CommStack has developed several OFDM (Orthogonal Frequency Division Multiplexing) modems as synthesizable Hardware Description... [03 Jul 2008]
Blind Carrier Frequency Offset Estimation in SISO, MIMO and Multiuser OFDM Systems
White Paper Relying on a kurtosis-type criterion, in this paper a low-complexity blind carrier frequency offset (CFO) estimator for orthogonal frequency-division multiplexing (OFDM) systems is developed. This paper shows that this approach can be applied to... [03 Jul 2008]
A Modified Scheme of OFDM Transceiver for Reduction of Its Natural Delay
White Paper This paper analyzes the natural processing delay of OFDM systems and proposed two modified functional blocks to decrease about 25% of the total delay. This paper also focuses on the packet-type multiple access, in which only one transmitter... [03 Jul 2008]
Asymptotic Performance of Transmit Diversity Via OFDM for Multipath Channels
White Paper Here it shows that when the Alamouti code is placed within an OFDM structure, using adjacent frequency bands rather than consecutive symbol intervals, it can asymptotically achieve the same performance in multipath fading as the Alamouti code in... [03 Jul 2008]
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