Space-time coded OFDM for high data-rate wireless communication over wideband channels

Agrawal, Dakshi; Tarokh, Vahid; Naguib, A.F.; Seshadri, N.

doi:10.1109/vetec.1998.686154

Cited by 431 publications

(255 citation statements)

References 5 publications

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“…The use of OFDM in the context of spatial multiplexing has been proposed previously in [4], [11], [15], and [16]. However, it appears that no capacity studies of OFDM-based spatial multiplexing systems using the physically motivated MIMO fading channel model provided in this paper have been performed so far.…”

Section: ) Relation To Previous Workmentioning

confidence: 99%

On the capacity of OFDM-based spatial multiplexing systems

Bölcskei

Gesbert

Paulraj³

2002

IEEE Trans. Commun.

789

417

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Abstract-This paper deals with the capacity behavior of wireless orthogonal frequency-division multiplexing (OFDM)-based spatial multiplexing systems in broad-band fading environments for the case where the channel is unknown at the transmitter and perfectly known at the receiver. Introducing a physically motivated multiple-input multiple-output (MIMO) broad-band fading channel model, we study the influence of physical parameters such as the amount of delay spread, cluster angle spread, and total angle spread, and system parameters such as the number of antennas and antenna spacing on ergodic capacity and outage capacity. We find that, in the MIMO case, unlike the single-input single-output (SISO) case, delay spread channels may provide advantages over flat fading channels not only in terms of outage capacity but also in terms of ergodic capacity. Therefore, MIMO delay spread channels will in general provide both higher diversity gain and higher multiplexing gain than MIMO flat-fading channels.Index Terms-Broad-band fading channels, diversity gain, ergodic capacity, MIMO, multiplexing gain, OFDM, outage capacity.

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Section: ) Relation To Previous Workmentioning

confidence: 99%

On the capacity of OFDM-based spatial multiplexing systems

Bölcskei

Gesbert

Paulraj³

2002

IEEE Trans. Commun.

789

417

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“…Space-frequency codes based directly on space-time codes (with time reinterpreted as frequency) have been proposed [10], [19], [50], [51], [52], but they fail to exploit the frequency diversity of a frequency-selective fading MIMO channel [11]. Guidelines for the design of full-diversity space-frequency codes are given in [11].…”

Section: Space-time Coding Techniques For Mimo-ofdmmentioning

confidence: 99%

Broadband MIMO-OFDM wireless communications

et al. 2004

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Abstract-Orthogonal frequency division multiplexing (OFDM) is a popular method for high data rate wireless transmission. OFDM may be combined with antenna arrays at the transmitter and receiver to increase the diversity gain and/or to enhance the system capacity on time-variant and frequency-selective channels, resulting in a multiple-input multiple-output (MIMO) configuration. This paper explores various physical layer research challenges in MIMO-OFDM system design, including physical channel measurements and modelling, analog beam forming techniques using adaptive antenna arrays, space-time techniques for MIMO-OFDM, error control coding techniques, OFDM preamble and packet design, and signal processing algorithms used for performing time and frequency synchronization, channel estimation, and channel tracking in MIMO-OFDM systems. Finally, the paper considers a software radio implementation of MIMO-OFDM.

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“…OFDM (orthogonal frequency division multiplexing) transforms selective frequency fading channel which is a characteristic of the wireless broadband, into parallel flat fading channel that is less complex to combat [1]. Hence, combining MIMO and OFDM allows the deployment of wireless broadband access.…”

Section: Introductionmentioning

confidence: 99%

Joint BLAST-STTC for MIMO-OFDM System

Niyizamwiyitira¹,

Kang²,

Oh³

2010

Journal of information and communication convergence engineerin

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Abstract-This study focuses on improving MIMO-OFDM systems by combining a wireless communication architecture known as vertical BLAST(bell laboratories layered space-time) or V-BLAST and STTC(space time trellis coding). In this paper, the combination is done by introducing STTC in each V-BLAST layer. Moreover, this architecture uses multiple antennas that are grouped into small number of antennas which makes it less complex to decode by decoding every group. Whereas, in traditional V-BLAST, all the antennas form one group and they are decoded together at the receiver, therefore, this increases the complexity as the number of antennas is getting high.We compare the bit error rate performance of this system with MIMO-OFDM that uses convolutional coding instead of STTC. Under the same spectral efficiency, the simulation results prove that joining V-BLAST with STTC improves MIMO-OFDM systems performance. Index terms-V-BLAST, STTC, BLAST-STTC, MIMO-OFDM

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Space-time coded OFDM for high data-rate wireless communication over wideband channels

Cited by 431 publications

References 5 publications

On the capacity of OFDM-based spatial multiplexing systems

On the capacity of OFDM-based spatial multiplexing systems

Broadband MIMO-OFDM wireless communications

Joint BLAST-STTC for MIMO-OFDM System

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