Cyclic prefixing or zero padding for wireless multicarrier transmissions?

Muquet, B.; Wang, Zhengdao; Giannakis, Georgios B.; Courville, M. de; Duhamel, Pierre

doi:10.1109/tcomm.2002.806518

Cited by 701 publications

(453 citation statements)

References 17 publications

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“…The shift operator matrix, J, is given by (8) where I N is and N × N identity matrix and J l neatly implements a right (down) shift by l elements, accounting for the delay of the associated path.…”

Section: Receiver Architecturementioning

confidence: 99%

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Arrayed MC‐CDMA reception in space‐time diffused multipath vector channels

Rashid

Manikas

2007

Wireless Communications

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Multi-Carrier Code Division Multiple Access (MC-CDMA) is a modulation scheme that combines the advantages of OFDM and CDMA to provide robustness against frequency selectivity in wireless channels. Arrayed MC-CDMA systems combine MC-CDMA and antenna array technology to harness the spatial and temporal 'signatures' of received signals, thus making it possible to realize high transmission rates envisioned for next generation wireless communications. Localized scattering, which occurs for each multipath, motivates the frequency selective wireless channel to be modelled as a diffused vector channel. In this paper, space-time diffused vector channels for arrayed MC-CDMA systems are modelled and analyzed. Simulation studies show that the use of this diffused channel modelling in arrayed MC-CDMA receivers yields better bit error rate (BER) and SNIR out performance than receivers that ignore the presence of spatial and/or temporal diffusion.

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Section: Receiver Architecturementioning

confidence: 99%

“…The channel is assumed to be diffused spatially and temporally, and the nominal DOAs and nominal TOAs of the multipath clusters are assumed to be pre-estimated (e.g. using pilot-based approaches [8], or the method proposed in [9]). …”

Section: Simulation Studiesmentioning

confidence: 99%

Arrayed MC‐CDMA reception in space‐time diffused multipath vector channels

Rashid

Manikas

2007

Wireless Communications

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“…However, overlap-adding operation incurs information loss: it folds a received block that is a linear convolution of the input and the channel, into a shorter block that corresponds to a circular convolution of the input and the channel. This fact has been recognized in [4], and other forms of receivers have been developed to improve the system performance.…”

Section: Introductionmentioning

confidence: 97%

Frequency-Domain Oversampling for Zero-Padded OFDM in Underwater Acoustic Communications

Wang

Zhou

Giannakis

et al. 2010

2010 IEEE Global Telecommunications Conference GLOBECOM 2010

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Abstract-Although time-domain oversampling of the received baseband signal is common for single-carrier transmissions, the counterpart of frequency-domain oversampling is rarely used for multicarrier transmissions. In this paper, we explore frequencydomain oversampling to improve the system performance of zero-padded OFDM transmissions over underwater acoustic channels with large Doppler spread. We use a signal design that enables separate sparse channel estimation and data detection, rendering a low complexity receiver. Based on both simulation and experimental results, we observe that the receiver with frequency-domain oversampling outperforms the conventional one considerably in channels with moderate and large Doppler spreads, and the gain increases as the Doppler spread increases. Although a raised-cosine pulse-shaping window can be used to improve the system performance relative to a rectangular window at the expense of data rate reduction, the performance gain is much less than that brought by frequency-domain oversampling in the considered OFDM system for Doppler spread channels.Index Terms-OFDM, zero-padding, inter-carrier interference, Doppler spread, frequency-domain oversampling.

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“…Both OFDM and SC transmission with FDE (SC-FDE) can be realised using the cyclic prefixing (CP) technique at the cost of an extra power overhead. Recently, zero padding (ZP) has also been studied as an alternative to CP in both OFDM and SC systems [4][5][6]. The advantages of OFDM-ZP over OFDM-CP have been discussed in Reference [6] for single-user systems with non-iterative detectors.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, zero padding (ZP) has also been studied as an alternative to CP in both OFDM and SC systems [4][5][6]. The advantages of OFDM-ZP over OFDM-CP have been discussed in Reference [6] for single-user systems with non-iterative detectors. The turbo receiver studied in Reference [4] involves iterative decoding, but not iterative joint equalisation and decoding.…”

Section: Introductionmentioning

confidence: 99%

Single‐ and multi‐ carrier IDMA schemes with cyclic prefixing and zero padding techniques

Guo

Yuan

Ping

2008

Trans Emerging Tel Tech

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In this paper, we investigate single-carrier (SC) and multi-carrier IDMA schemes with cyclic prefixing (CP) and zero padding (ZP) techniques. These schemes are called SC-IDMA-CP, SC-IDMA-ZP, orthogonal frequency-division multiplexing (OFDM)-IDMA-CP and OFDM-IDMA-ZP, respectively. By exploiting the circulant property of channel matrices, the multi-user detection of these schemes can be efficiently realised with per-user complexity independent of the number of users and the length of inter-symbol interference (ISI) channels. We show the potential advantages of ZP-based schemes in power efficiency and convergence speed. Simulation results are provided to compare the four schemes. SUMMARYIn this paper, we investigate single-carrier (SC) and multi-carrier IDMA schemes with cyclic prefixing (CP) and zero padding (ZP) techniques. These schemes are called SC-IDMA-CP, SC-IDMA-ZP, orthogonal frequency-division multiplexing (OFDM)-IDMA-CP and OFDM-IDMA-ZP, respectively. By exploiting the circulant property of channel matrices, the multi-user detection of these schemes can be efficiently realised with per-user complexity independent of the number of users and the length of inter-symbol interference (ISI) channels. We show the potential advantages of ZP-based schemes in power efficiency and convergence speed.Simulation results are provided to compare the four schemes.

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Cyclic prefixing or zero padding for wireless multicarrier transmissions?

Cited by 701 publications

References 17 publications

Arrayed MC‐CDMA reception in space‐time diffused multipath vector channels

Arrayed MC‐CDMA reception in space‐time diffused multipath vector channels

Frequency-Domain Oversampling for Zero-Padded OFDM in Underwater Acoustic Communications

Single‐ and multi‐ carrier IDMA schemes with cyclic prefixing and zero padding techniques

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