space ofdm systems
Space-Frequency Coded Broadband OFDM Systems
White Paper This paper investigates the use of space-coding in OFDM-based broadband systems where both spatial and frequency diversity are available. Space-time coding for fading channels is a communication technique that realizes the diversity benefits of... [28 Mar 2005]
Space-Time Coding in MISO-OFDM Systems With Implementation Impairments
White Paper Implementation of OFDM-based systems suffers from In-phase and Quadrature-phase (IQ) imbalances in the front-end analog processing. In this paper, the effect of IQ imbalances on an OFDM-based system with Alamouti coding is studied and an efficient... [10 Apr 2008]
Space-Frequency Transmit Diversity in Multiband-OFDM Systems
White Paper This paper investigates the suitability and performance of space-frequency block coded Multi-Band Orthogonal Frequency Division Multiplexing (MB-OFDM) system under UWB channel model. In the proposed MB-OFDM UWB system, the space coded symbols are... [11 Apr 2007]
Space-Time/Frequency Coding for MIMO-OFDM in Next Generation Broadband Wireless Systems
White Paper This paper provides an overview of Space-Time (ST) coding, Space-Frequency (SF) coding, and Space-Time-Frequency (STF) coding for MIMO-OFDM systems. In particular, coding over the space, time and frequency domains provided by MIMO-OFDM will enable... [11 Apr 2007]
QoS-Driven Asynchronous Uplink Subchannel Allocation Algorithms for Space-Time OFDM-CDMA Systems in Wireless Networks
White Paper This paper proposes the QoS-driven cross-layer subchannel-allocation algorithms for data transmissions over asynchronous uplink space-time OFDM-CDMA systems. In order to support the diverse Quality of Service (QoS) requirements for differentiated... [11 Apr 2007]
Subchannel-Allocation Algorithms and Performance Analysis for Space-Time OFDM-CDMA Based Systems in Wireless Networks
White Paper This paper proposes the subchannel allocation algorithms based on space-time OFDM-CDMA systems, and develop the throughput-performance analysis frameworks to evaluate the proposed algorithms. Both Space-Time (ST) processing and Orthogonal Frequency... [01 Nov 2004]
Performance of MIMO Antenna Selection for Space-Time Coded OFDM Systems
White Paper This paper studies antenna selection for space-time coded orthogonal frequency division multiplexing (OFDM) systems that employ multiple transmit and receive antennas. It is assumed that the channel state information (CSI) is exactly known at the... [01 Nov 2004]
Linear Space-Time Precoding for OFDM Systems Based on Channel State Information
White Paper A new linear space-time precoding scheme for OFDM systems is developed based on channel state information at the transmitter. Drawbacks of OFDM systems such as severe performance degradation for long channel delays exceeding the guard interval and... [01 Nov 2004]
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]
LDPC Based Differential Unitary Space-Frequency Coding for MIMO-OFDM Systems
White Paper 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). [26 Jul 2005]
Blind Layered Space-Time Equalization for MIMO OFDM Systems
White Paper This paper proposes a novel blind receiver for Multiple-Input Multiple-Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) systems, where Blind Source Separation (BSS) and V-BLAST are combined to perform layered space-time equalization... [14 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]
Bit and Power Allocation for MIMO-OFDM Systems With Spatial Mode Selection Over Frequency- Space- Time- Selective Channels
White Paper This paper proposes the bit and power allocation scheme for MIMO-OFDM systems with spatial mode selection over frequency- space- time- selective channels. Multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) system... [29 Oct 2004]
Space-Frequency Bit-Interleaved Convolutional and Turbo Coded OFDM Systems With Simplified Iterative Approaches
White Paper In this paper, space-time bit-interleaved coded OFDM (Orthogonal Frequency Division Multiplexing) modulated systems are studied. Moreover, the combined use with OFDM modulation enable effective frequency selectivity exploitation in multipath channels. [11 Apr 2007]
A Space-Time FIR Equalizer Training Algorithm for MIMO-OFDM Systems
White Paper This paper proposes several new direct training-based methods for FIR space-time equalizer design in Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems employing spatial multiplexing. [11 Apr 2007]
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