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whitepaper 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]
whitepaper This paper proposes a new diversity technique for broadband wireless access systems that uses orthogonal frequency division multiplexing (OFDM) and describes its performance. One is optimal antenna selection in the reception phase and the other is...
[10 Apr 2008]
whitepaper This paper proposes novel space-time-frequency (STF) coding for multiantenna orthogonal frequency-division multiplexing (OFDM) transmissions over frequency-selective Rayleigh fading channels. This, together with the scarcity of bandwidth resources...
[10 Apr 2008]
whitepaper In this paper, the performance of a bit-interleaved space-time coding (BISTC) scheme is investigated for OFDM systems. Performance analyses based on both pairwise error probability (PEP) and error bounds are conducted over a more general block...
[10 Apr 2008]
whitepaper The signal space is studied by considering the correlation properties of the OFDM-PM signals. The motivation behind OFDM-PM is to alleviate the high peak-to-average power ratio of conventional OFDM systems.
[10 Apr 2008]
whitepaper The basic model of OFDM-based spatial multiplexer is very suitable for high data rate transmission, and if combined with other techniques such as channel coding or space time coding can provide desired diversity and spatial multiplexing gain.
[10 Apr 2008]
whitepaper When the Alamouti code is applied (as a space-time block code) to an OFDM system with transmit diversity, the simple Alamouti decoding requires that each subchannel is flat-fading and constant over two symbol periods (Alamouti codeword period).
[10 Apr 2008]
whitepaper This contribution extends the recently proposed Pseudo-Random-Postfix OFDM (PRP OFDM) transceiver to the Multiple Transmit Multiple Receive (MTMR) antennæ context. Performance is illustrated by simulations in the context of the 5.2GHz OFDM WLAN...
[23 Jan 2008]
whitepaper Focusing on transmit diversity orthogonal frequency division multiplexing (OFDM) transmission through frequency selective channels, this paper pursues novel iterative channel estimation approaches for both space-frequency OFDM (SF-OFDM) and space...
[31 Jul 2007]
whitepaper This paper proposes reduced complexity blind Layered Space-Time Equalization (LSTE) for Multiple-Input Multiple-Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM). Blind Source Separation (BSS) combined with a Vertical Bell...
[18 Apr 2007]
whitepaper Introducing an abstract model to characterize the statistical properties of the space-time channel, it provides Monte-Carlo methods for estimating the capacity cumulative distribution function, expected capacity, and outage capacity of the OFDM...
[18 Apr 2007]
whitepaper This paper compares Pre-IDFT downlink beamforming with Space-Time Block coded and Space-Frequency block coded transmit diversity schemes for 4×1 downlink multi-user OFDM (OFDM-TDMA and OFDMA) systems.
[18 Apr 2007]
whitepaper Orthogonal Frequency Division Multiplexing (OFDM) is a special form of multi-carrier transmission where all the subcarriers are orthogonal to each other. OFDM promises a higher user data rate and great resilience to severe signal fading effects of...
[18 Apr 2007]
whitepaper 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]
whitepaper This paper considers space-time -frequency transmits diversity with orthogonal designs in a broadband OFDM system. Particularly, the paper discusses orthogonal transmit diversity versus spatial multiplexing and space-time-frequency codes which have...
[14 Apr 2007]
whitepaper Space-Frequency (SF) group codes are designed for Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems. A scenario where the multiple codewords are loaded onto the subcarriers of the OFDM system in parallel...
[13 Apr 2007]
whitepaper For the space-frequency coded MIMO-OFDM system, it is shown that any space-frequency code designed to achieve full diversity in the independent fading channel can achieve full diversity in an arbitrary spatially correlated channel.
[13 Apr 2007]
whitepaper This paper investigates the effect of system parameters on performance limits of space-time-frequency coded OFDM systems over block-fading channels. For this purpose, the authors obtain a sphere packing lower bound on average word error probability...
[13 Apr 2007]
whitepaper Two different OFDM schemes that employ the precoding are investigated: the first one is based on space-time coding, the second is based on a transmit diversity using an optimal design of symbols for channel estimation.
[13 Apr 2007]
whitepaper The paper also shows that any space-frequency code designed to achieve full diversity in spatially independent MIMO-OFDM systems can be used to achieve full diversity in spatially correlated scenarios.
[13 Apr 2007]
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