OFDM with guard interval versus OFDM/offsetQAM for high data rate UMTS downlink transmission

Lacroix, Dominique; Goudard, N.; Alard, M.

doi:10.1109/vtc.2001.957247

Cited by 42 publications

(19 citation statements)

References 3 publications

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“…According to (13), the intrinsic interference (14) is purely imaginary. Thus we can perfectly recover the transmitted symbol by simply taking the real part of the demodulation outputâ m,n .…”

Section: Implementation Of Mimo-iota System With Polyphase Filtersmentioning

confidence: 99%

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Design of isotropic orthogonal transform algorithm-based multicarrier systems with blind channel estimation

Xiao

et al. 2012

IET Communications

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Orthogonal Frequency Division Multiplexing (OFDM) technique has gained increasing popularity in both wired and wireless communication systems. However, in the conventional OFDM systems the insertion of a cyclic prefix (CP) and the transmission of periodic training sequences for purpose of channel estimation decrease the system's spectral efficiency. As an alternative to OFDM, isotropic orthogonal transform algorithm (IOTA) based multicarrier system adopts a proper pulse shaping with good time and frequency localization properties to avoid interference and maintain orthogonality in real field among sub-carriers without the use of CP. In this paper, we propose linearly precoded IOTA based multicarrier systems to achieve blind channel estimation by utilizing the structure of auto-correlation and cross-correlation matrices introduced by precoding. The results 1 show that the proposed IOTA based multicarrier systems achieve better power and spectral efficiency compared to the conventional OFDM systems.

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Section: Implementation Of Mimo-iota System With Polyphase Filtersmentioning

confidence: 99%

“…IOTA and OFDM systems in a realistic mobile communication context (both time and frequency dispersive) have been compared in [13]- [15] where it was shown that the performance advantage of IOTA over OFDM can be up to 4.5 dB depending on different type of wireless propagation channels.…”

Section: Introductionmentioning

confidence: 99%

Design of isotropic orthogonal transform algorithm-based multicarrier systems with blind channel estimation

Xiao

et al. 2012

IET Communications

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“…As a result, OFDM systems based on OQAM have recently been a subject of research for next-generation mobile wireless systems [4], [5], [6], [7], [8]. Our work focuses on a comparison between conventional OFDM with a cylic prefix (CP) and isotropic orthogonal transform algorithm (IOTA) OFDM without a cyclic prefix.…”

Section: Introductionmentioning

confidence: 99%

“…OFDM/OQAM employing IOTA, as in [4], [5], [6], [7], is a unique approach. Since IOTA-OFDM does not use a guard interval it is spectrally more efficient.…”

Section: Introductionmentioning

confidence: 99%

“…Many papers [4], [5], [6], [7], [14] have demonstrated promising advantages of OFDM/OQAM over CP-OFDM and this technology has already been introduced in many standards [1], [2], [3]. Due to the intrinsic lSI of the IOTA function, the conventional pilot aided channel estimation (PACE) schemes used in CP-OFDM are not directly applicable to IOTA-OFDM.…”

Section: Introductionmentioning

confidence: 99%

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A comparison of CP-OFDM with IOTA-OFDM under typical system imperfections

Kongara

Smith

Mann³

2008

IET Seminar Digests

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Abstract-In this paper we compare the performance of OFDM with a cyclic prefix (CP) and isotropic orthogonal transform algorithm (IOTA) OFDM without cyclic prefix under typical system imperfections such as channel estimation errors and frequency offset. The IOTA-OFDM system is based on offset quadrature amplitude modulation (OQAM) and promises an increased immunity to both inter-carrier interference (ICI) and inter-symbol interference (lSI). Moreover, IOTA-OFDM does not require a CP which makes it spectrally more efficient. Our simulation results show that compared to CP-OFDM, IOTA-OFDM is spectrally efficient and more tolerant to interference and frequency offset. Imperfect channel estimation may reduce the gains of IOTA-OFDM but considerable throughput advantages are still obtained for a fixed HER.

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Zhang

et al. 2009

Wireless Communications

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OFDM with guard interval versus OFDM/offsetQAM for high data rate UMTS downlink transmission

Cited by 42 publications

References 3 publications

Design of isotropic orthogonal transform algorithm-based multicarrier systems with blind channel estimation

Design of isotropic orthogonal transform algorithm-based multicarrier systems with blind channel estimation

A comparison of CP-OFDM with IOTA-OFDM under typical system imperfections

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