Optimum pre-DFT combining with cyclic delay diversity for OFDM based WLAN systems

Rahman, Muhammad Imadur; Witrisal, Klaus; Das, Suvra Sekhar; Fitzek, Frank H. P.; Olsen, Ole Jess; Prasad, Ramjee

doi:10.1109/vetecs.2004.1390592

Cited by 11 publications

(2 citation statements)

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“…In frequency domain, the receive signal is represented as: (8) where , , , denote the frequency domain representations of subcarrier of the received signal for the antenna, complex channel gains between antenna, and noise signal for the receive antenna, respectively. Finally, the MIMO channel model is expressed as (9) where (10) For the uncorrelated MIMO channel, it is assumed the channel is sufficiently spatially separated to ensure decorrelation of the multipath signals.…”

Section: B Mimo Channel Modelmentioning

confidence: 99%

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Analysis of Cyclic Delay Diversity on DVB-H Systems over Spatially Correlated Channel

Zhang¹,

Cosmas²,

Loo³

et al. 2007

IEEE Trans. on Broadcast.

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Abstract-The objective of this work is to research and analyse the performance of Cyclic Delay Diversity (CDD) with two transmit antenna on DVB-H systems operating in spatially correlated channel. It is shown in this paper that CDD can achieve desirable transmit diversity gain over uncorrelated channel with or without receiver diversity. However, in reality, the respective signal paths between spatially separated antennas and the mobile receiver is likely to be correlated because of insufficient antenna separation at the transmitter and the lack of scattering effect of the channel. Under this spatially correlated channel, it is apparent that CDD cannot achieve the same diversity gain as obtained under the uncorrelated channel. In this paper, a new upper bound on the pairwise error probability (PEP) of the CDD with spatial correlation of two transmit antennas is derived. The upper bound is used to study the CDD theoretical error performance and diversity gain losses over a generalized spatially correlated Rayleigh channel. This theoretical analysis is validated by the simulation of DVB-H systems with two transmit antennas and the CDD scheme. Both the theoretical and simulated results give the valuable insight that the CDD ability to perform well with a certain amount of channel correlation.Index Terms-Cyclic delay diversity (CDD), DVB-H, pairwise error probability (PEP), spatial correlation, transmit diversity.

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Section: B Mimo Channel Modelmentioning

confidence: 99%

“…DVB-T/H. Instead a simple yet elegant method known as Cyclic Delay Diversity (CDD) [6]- [8] is complaint and is applicable to DVB-T/H without modifications to its existing physical layer mainly because its signal processing is performed on the baseband OFDM [9] symbol in time-domain.…”

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confidence: 99%