Differential Quasi-Orthogonal Space-Frequency Trellis Codes

Flores, Jorge Abril; Sánchez, Jaime; Jafarkhani, Hamid

doi:10.1109/twc.2010.102210.100463

Cited by 6 publications

(4 citation statements)

References 16 publications

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“…However, channel estimation is still required for coherent detection [14], [15]. To avoid channel estimation in frequency-selective channels, differential OFDM (D-OFDM) was developed for single-antenna and MIMO systems in [16]- [22]. In cooperative communications over frequency-selective channels, the number of channels grows proportionally with the number of relays and the number of taps in the FIR filter.…”

mentioning

confidence: 99%

Differential Distributed Space-Time Coding With Imperfect Synchronization in Frequency-Selective Channels

Avendi

Jafarkhani

2015

IEEE Trans. Wireless Commun.

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Differential distributed space-time coding (D-DSTC) is a cooperative transmission technique that can improve diversity in wireless relay networks in the absence of channel information. Conventionally, it is assumed that channels are flat-fading and relays are perfectly synchronized at the symbol level. However, due to the delay spread in broadband systems and the distributed nature of relay networks, these assumptions may be violated. Hence, inter-symbol interference (ISI) may appear. This paper proposes a new differential encoding and decoding process for D-DSTC systems with multiple relays over slow frequency-selective fading channels with imperfect synchronization. The proposed method overcomes the ISI caused by frequency-selectivity and is robust against synchronization errors while not requiring any channel information at the relays and destination. Moreover, the maximum possible diversity with a decoding complexity similar to that of the conventional D-DSTC is attained. Simulation results are provided to show the performance of the proposed method in various scenarios.

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confidence: 99%

Differential Distributed Space-Time Coding With Imperfect Synchronization in Frequency-Selective Channels

Avendi

Jafarkhani

2015

IEEE Trans. Wireless Commun.

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“…Recently, in [85], differential quassi-orthogonal space-frequency trellis codes OFDM was investigated by combining unitary quasi-orthogonal trellis codes and differential modulation over the frequency and time domain. In [86] the authors proposed a channel estimation scheme for STC-OFDM, while in [87] a closed form expression of the PEP was derived for a 2-state SOSFTC-OFDM system using Gauss Chebyshev Quadrature technique.…”

Section: Stc-ofdm Systemmentioning

confidence: 99%

Review of Space-time Coded Orthogonal Frequency Division Multiplexing Systems for Wireless Communication

Oluwafemi¹,

Mneney²

2013

IETE Tech Rev

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Deployment of multi-input multi-output antenna systems with orthogonal frequency division multiplexing (OFDM) over wireless channels has been identified as one of the most promising techniques to support high-performance and high data rate communication for future wireless broadband services. This paper first highlights common space-time coding (STC) schemes used in wireless communication systems. The paper further reviews the deployments of these STC schemes over frequency selective fading channels with OFDM signalling through which there is coding over the space, time, and frequency domains.

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“…It can be implemented in two forms ST-Trellis and ST-Block codes [6]. The main problem with ST-Trellis [7] scheme is that its decoding complexity increases exponentially with diversity and transmission rate. To address this problem Alamouti proposed Orthogonal ST block codes (OSTBC) for 2×1 and 2×2 systems.…”

Section: Space-time Coding Of Mimo-ofdmmentioning

confidence: 99%

BER analysis of ST-Block coded MIMO-OFDM systems with frequency domain equalization in quasi-static mobile channels

Gupta

Saini

2011

2011 Annual IEEE India Conference

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Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) has become one of the key technologies for the Beyond 3G and 4G broadband wireless communications. MIMO channels increases the capacity (by a factor of the minimum number of transmit and receive antennas), data rate and immunity to Inter Symbol Interference (ISI) (due to concatenation with OFDM) particularly under frequency selective channels. To increase reliability and for robust transmission, coding can be done in space, time and frequency domains provided by MIMO-OFDM. In this Paper, a general Space-Time Block Coding (STBC) structure is presented in MIMO-OFDM systems. BER performance of STBC along with different equalizers is investigated and then optimum equalization method is suggested. Furthermore, Simulations are carried out with 2 transmit, 1 receive antenna and then with 2 transmit, 2 receive antenna MIMO-OFDM systems under both frequency flat and selective channels.

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Differential Quasi-Orthogonal Space-Frequency Trellis Codes

Cited by 6 publications

References 16 publications

Differential Distributed Space-Time Coding With Imperfect Synchronization in Frequency-Selective Channels

Differential Distributed Space-Time Coding With Imperfect Synchronization in Frequency-Selective Channels

Review of Space-time Coded Orthogonal Frequency Division Multiplexing Systems for Wireless Communication

BER analysis of ST-Block coded MIMO-OFDM systems with frequency domain equalization in quasi-static mobile channels

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