Performance of DVB-T OFDM based single frequency networks: effects of frame synchronisation, carrier frequency offset and non-synchronised sampling errors

Gallardo, A.M.; Woodward, M.E.; Rodriguez-Tellez, J.

doi:10.1109/vtc.2001.956917

Cited by 6 publications

(3 citation statements)

References 8 publications

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“…Further, as the quantity is independent of the chip index , the orthogonality between the contributions from the different users is not affected by the constant timing offsets, i.e., multiuser interference is absent as well ( for ). The systematic phase rotation of the FFT outputs is compensated without loss of performance by rotating the th FFT output over an (estimate of the) angle , resulting in equalizer coefficients given by (19) The resulting quantity at the input of the decision device is again given by (16). Hence, the effect of a constant timing offset on uplink MC-DS-CDMA is compensated without reduction of the SNR by applying the appropriate counter-rotation to each FFT output.…”

Section: A Uplink Mc-ds-cdmamentioning

confidence: 99%

“…In [19]- [24], the effect of carrier frequency offsets on various multicarrier systems has been investigated. The sensitivity to clock frequency offsets has been reported for OFDM and MC-CDMA in [19], [25]- [27] and for downlink MC-DS-CDMA in [28]. The present paper extends results from [28] by examining the effect of static clock phase offsets and clock frequency offsets on both uplink and downlink MC-DS-CDMA.…”

Section: Introductionmentioning

confidence: 99%

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A comparison between uplink and downlink MC-DS-CDMA sensitivity to static timing and clock frequency offsets

Steendam

Bruneel

Moeneclaey

2005

IEEE Trans. Signal Process.

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We study the effect of fixed timing offsets and clock frequency offsets on the performance of multicarrier directsequence CDMA (MC-DS-CDMA) for both uplink and downlink communication, assuming orthogonal spreading sequences and a slowly varying multipath channel. We point out that a constant timing offset does not give rise to performance degradation for neither uplink nor downlink MC-DS-CDMA. We derive simple but accurate approximate expressions that allow us to easily quantify the effect of clock frequency offset and the influence of the different system parameters on the receiver performance in practical situations. Further, we show that for both uplink and downlink MC-DS-CDMA, the performance in the presence of a clock frequency offset rapidly degrades with an increasing number of carriers. It turns out that this degradation is larger in the uplink than in the downlink because the former suffers from a higher level of multiuser interference. For a given maximum relative clock frequency offset, enlarging the spreading factor in a fully loaded system does not affect the downlink degradation but strongly increases the uplink degradation.Index Terms-Clock frequency offset, multicarrier directsequence CDMA, synchronization.

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Section: A Uplink Mc-ds-cdmamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A comparison between uplink and downlink MC-DS-CDMA sensitivity to static timing and clock frequency offsets

Steendam

Bruneel

Moeneclaey

2005

IEEE Trans. Signal Process.

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“…Orthogonal Frequency Division Multiplexing Access (OFDMA) is, as its name indicates, a multiple access technique based on multicarrier OFDM modulation which was introduced for Digital Video Broadcasting (DVB) [1] and adopted for the emerging broadband wireless systems: IEEE802.16 WiMAX [2] and Long Term Evolution (LTE) [3]. It allows to mitigate the frequency selective fading channels and enables thus to carry parallel rates on narrow flat fading subcarriers leading to high spectral efficiency.…”

Section: Introductionmentioning

confidence: 99%

Joint Use of Hierarchical Modulation and Relays in OFDMA Networks

Jdidi

Chahed

2011

2011 IEEE Vehicular Technology Conference (VTC Fall)

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Relays are typically used to convey information to users who are unable to decode the direct signal from the base station successfully. In the case where the users are able to successfully decode the direct signal without the help of relays, the use of the latter can only decrease their performance because they will consume, uselessly, additional resources. If, however, hierarchical modulation can also be jointly used, the overall performance of a relay-based system can be enhanced even if the users are able to decode the direct signal successfully, without the need for relays. And this is the rationale behind this paper where we study the joint use of hierarchical modulation and relays, and model such a setting for a dynamic user configuration at the flow level. We validate our model against simulations and quantify the gains thus achieved in comparison with a system without relays, with and without hierarchical modulation.

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Measurement and prediction of DTMB reception quality in single frequency networks

Yan

Ding

Zhang

et al. 2011

2011 7th International Wireless Communications and Mobile Computing Conference

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Performance of DVB-T OFDM based single frequency networks: effects of frame synchronisation, carrier frequency offset and non-synchronised sampling errors

Cited by 6 publications

References 8 publications

A comparison between uplink and downlink MC-DS-CDMA sensitivity to static timing and clock frequency offsets

A comparison between uplink and downlink MC-DS-CDMA sensitivity to static timing and clock frequency offsets

Joint Use of Hierarchical Modulation and Relays in OFDMA Networks

Measurement and prediction of DTMB reception quality in single frequency networks

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