Multicarrier spread space-spectrum multiple access for the MIMO forward link transmission

Ng, B.K.; Sousa, E.S.

doi:10.1109/pimrc.2002.1045239

Cited by 6 publications

(2 citation statements)

References 4 publications

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“…The transmission is designed to support more multiplexed signals than transmit antennas and to provide space-frequency diversity for each multiplexed signal. Another spread spectrum-based STF transmission framework was proposed in [9], therein called multi-carrier spread space spectrum multiple access (MC-SSSMA), with the idea of fully spreading each user symbol over space, time and frequency. Despite the achieved spectral efficiency gains, the design of [9] was restricted to the case where the number of transmit and receive antennas is equal to the spreading gain.…”

Section: Introductionmentioning

confidence: 99%

“…Another spread spectrum-based STF transmission framework was proposed in [9], therein called multi-carrier spread space spectrum multiple access (MC-SSSMA), with the idea of fully spreading each user symbol over space, time and frequency. Despite the achieved spectral efficiency gains, the design of [9] was restricted to the case where the number of transmit and receive antennas is equal to the spreading gain. In [10], STF spreading was proposed for MC-CDMA based on the concatenation of a space-time spreading code with a frequency-domain spreading code.…”

Section: Introductionmentioning

confidence: 99%

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MIMO Transceiver Combining Space-Frequency Spreading and Block-Coding

Almeida¹,

Favier

2010

2010 IEEE 72nd Vehicular Technology Conference - Fall

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This paper presents a multiple-access MIMO wireless transceiver combining space-and frequency-domain spreadings with a frequency-domain block-coding strategy. Spreading across space (transmit antennas) and frequency (subcarriers) adds resilience against deep channel fades while providing space and frequency diversities, and block-coding enables multiple-access transmission. The merits of the proposed MIMO transceiver using a Zero Forcing (ZF) receiver is confirmed by means of some computer simulation results. I. INTRODUCTIONSignal processing solutions based on the use of multiple transmit and receive antennas date back to over a decade. Wireless communication systems employing multiple antennas at both ends of the link, commonly known as multiple-input multiple-output (MIMO) systems, are being considered as one of the key technologies to be deployed in current and upcoming wireless communications standards [1]. On the other hand, combinations of orthogonal frequency division multiplexing (OFDM) and code division multiple access (CDMA) technologies have been proposed in a number of different works [2]. Multi-carrier (MC)-CDMA performs spreading of the information symbols across the different subcarriers but suffers from limited frequency diversity gains like conventional CDMA [3], [4]. Multi-carrier direct-sequence (MCDS)-CDMA differs from MC-CDMA by performing the spreading operation in the time-domain at each subcarrier [5]. For combating frequency-selective fading, MCDS-CDMA requires forward error-correction coding and frequency-domain interleaving which implies a loss of useful bandwidth. In [6], a hybrid of MC-CDMA and OFDM system with orthogonal transmission in the frequency-domain is proposed which ensures MUI-free transmission/reception regardless of the multipath channel profile. A related approach, called multi-carrier blockspread (MCBS)-CDMA, was introduced in [7] by capitalizing on redundant block spreading and frequency-domain linear precoding to preserve orthogonal multiple-accessing and to enable multipath diversity gains.By exploiting the spatial dimension at the transmitter, in addition to time and frequency dimensions, a number of different space-time-frequency (STF) transceivers were proposed to enable orthogonal multiple-access in multiuser multipleinput multiple-output (MIMO) systems combining OFDM and CDMA principles. The work [8] proposed space-frequency spreading codes for the downlink of a multiuser MIMO-OFDM system. The transmission is designed to support more

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

MIMO Transceiver Combining Space-Frequency Spreading and Block-Coding

Almeida¹,

Favier

2010

2010 IEEE 72nd Vehicular Technology Conference - Fall

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Multiuser MIMO Systems Using Space–Time–Frequency Multiple-Access PARAFAC Tensor Modeling

Almeida¹,

Favier²,

Mota³

2009

Optimizing Wireless Communication Systems

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Trilinear Space-Time-Frequency Codes for broadband MIMO-OFDM systems

Almeida

Favier

Mota

2006

2006 International Telecommunications Symposium

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International audienceA new multi-antenna coding framework is proposed for space-time-frequency (STF) transmissions over broadband multiple input multiple output (MIMO) systems based on orthogonal frequency division multiplexing (OFDM). A tensor decomposition known as PARAFAC is used as the core of a multi- stream space-time-frequency coder that jointly multiplex and spreads several input streams over space (transmit antennas), time (symbol periods) and frequency (subcarriers). We coin the term trilinear STF codes since each input symbol is coded over a space-time-frequency grid by a triple product code: each trilinearly coded symbol is interpreted as an element of a third-order tensor, which can be decomposed using PAFAFAC analysis. Trilinear STF codes are designed for an arbitrary number of transmit and receive antennas. They afford a variable degree of multiplexing-spreading over each one of the three signal dimensions while providing full diversity gain for each multiplexed stream. At the receiver, a direct blind decoding based on a relatively simple linear processing is made possible thanks to the PARAFAC modeling of the received signal. Computer simulation results are provided for performance assessment of the proposed codes in a variety of configurations

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Multicarrier spread space-spectrum multiple access for the MIMO forward link transmission

Cited by 6 publications

References 4 publications

MIMO Transceiver Combining Space-Frequency Spreading and Block-Coding

MIMO Transceiver Combining Space-Frequency Spreading and Block-Coding

Multiuser MIMO Systems Using Space–Time–Frequency Multiple-Access PARAFAC Tensor Modeling

Trilinear Space-Time-Frequency Codes for broadband MIMO-OFDM systems

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