COFDM: an overview

Zou, William Y.; Wu, Yiyan

doi:10.1109/11.372015

Cited by 714 publications

(249 citation statements)

References 24 publications

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“…This fading is a result of the summing of signals from several paths (direct, reflected, scattered, etc.) at the receiver antenna [8], [9]. A wireless channel is a good example of a fading channel.…”

Section: Wireless Fading Channelmentioning

confidence: 99%

“…If the coherence bandwidth is defined over which the frequency correlation function is above 0.5 (which is sufficient for all practical purposes), the coherence bandwidth is approximately [8], [9]:…”

Section: Wireless Fading Channelmentioning

confidence: 99%

“…3 indicates, an OFDM wireless communication system consists of three major parts: transmitter, channel, and receiver [2], [3], [8].…”

Section: B Ofdm Wireless Communication Systemmentioning

confidence: 99%

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Narrowband Interference Suppression in Wireless OFDM Systems

Nikolova

Iliev

Ovtcharov

et al. 2009

African Journal of ICT

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Abstract-Signal distortions in communication systemsoccur between the transmitter and the receiver; these distortions normally cause bit errors at the receiver. In addition interference by other signals may add to the deterioration in performance of the communication link. In order to achieve reliable communication, the effects of the communication channel distortion and interfering signals must be reduced using different techniques. The aim of this paper is to introduce the fundamentals of Orthogonal Frequency Division Multiplexing (OFDM) and Orthogonal Frequency Division Multiple Access (OFDMA), to review and examine the effects of interference in a digital data communication link and to explore methods for mitigating or compensating for these effects.

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Section: Wireless Fading Channelmentioning

confidence: 99%

Section: Wireless Fading Channelmentioning

confidence: 99%

See 1 more Smart Citation

Narrowband Interference Suppression in Wireless OFDM Systems

Nikolova

Iliev

Ovtcharov

et al. 2009

African Journal of ICT

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show abstract

“…If the performance of a real-time encoder is improved or non-real-time video data are used for transmission, the required data rate used in this study would decrease. nique [12], and adopt the low-density parity check (LDPC) [13] and Bose-Chaudhuri-Hocquenghem (BCH) [14,15] concatenated channel codes, quadrature phase shift keying (QPSK)-256 quadrature amplitude modulation (QAM) constellation, and various sizes of FFT, CP, and PPs (pilot patterns) to maximizing the data transmission capacity, as shown in Table 1. Various interleaving techniques, such as bit, cell, time and frequency interleaving, rotation constellation The M-PLP multiplexing technique is employed in DVB-T2 systems to multiplex and transmit multiple layer broadcasting service signals.…”

Section: Video Compression Technique and Transmission Requirement Formentioning

confidence: 99%

A convergence broadcasting transmission of fixed 4K UHD and mobile HD services through a single terrestrial channel by employing FEF multiplexing technique in DVB-T2

Won

Lee

et al. 2016

Electr Eng

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Recently, a convergence broadcasting transmission for providing fixed 4K ultrahigh-definition (UHD) and mobile high-definition (HD) services through a single terrestrial channel is investigated by employing multiple-physical layer pipe (M-PLP) multiplexing and transmission technologies in digital video broadcasting (DVB)-second-generation terrestrial (T2) systems, and the scalable high-efficiency video coding (SHVC) technique. The M-PLP technique employs different code rates and constellation points for each layer of data and multiplexes differently encoded layers of data into a single frame, with no change of the inverse fast Fourier transform (IFFT) and cyclic prefix (CP). However, the IFFT size should be increased, and the CP size should be decreased for the 4K UHD layer while the opposite is true for the HD layer. Another aspect is that HD layer data are more important than 4K UHD layer data for reliable SHVC decoding, and thus the IFFT size should be decreased and the CP size should be increased for the HD layer to be robust to channel situations. In this paper, the possibility of a terrestrial fixed 4K UHD and mobile HD convergence broadcasting service through a single channel employing the future extension frame (FEF) multiplexing technique is examined. FEF multiplexing technology can be used to adjust the IFFT and CP size for each layer, whereas M-PLP multiplexing technology Department of Electronic Engineering, Konkuk University, Seoul, Republic of Korea cannot. We described the convergence broadcasting service scenario and proposed a transmission system structure by employing FEF and transmission technologies in DVB-T2 systems. Available transmission parameters are extracted and the reception performance of the transmission parameters is examined using computer simulations. From the results, for the 6 and 8 MHz bandwidths, reliable reception of both fixed 4K UHD and mobile HD layer data can be achieved under a static and fast fading multipath channel.

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“…In order to overcome the problems associated with conventional OFDM, the IOTA approach has been proposed [9], [10], [11]. OFDM/OQAM employing IOTA, as in [4], [5], [6], [7], is a unique approach.…”

Section: Introductionmentioning

confidence: 99%

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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COFDM: an overview

Cited by 714 publications

References 24 publications

Narrowband Interference Suppression in Wireless OFDM Systems

Narrowband Interference Suppression in Wireless OFDM Systems

A convergence broadcasting transmission of fixed 4K UHD and mobile HD services through a single terrestrial channel by employing FEF multiplexing technique in DVB-T2

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

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