A comparison study of the uplink performance of W-CDMA and OFDM for mobile multimedia communications via LEO satellites

Papathanassiou, Apostolos; Salkintzis, A.K.; Mathiopoulos, P. Takis

doi:10.1109/98.930095

Cited by 41 publications

(42 citation statements)

References 8 publications

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“…A careful literature survey reveals the papers [3], [4], [5] and [6] which studied the performance of OFDM over LEO satellite channel. In [3], a comparison studies of the uplink performance of wideband code division multiple access (W-CDMA) and OFDM systems is presented for mobile multimedia communications via LEO satellites. In [4], the characteristics of interchannel interference (ICI) distortions are studied under fast fading LEO satellite channel as well as the effect of Doppler frequency shift on ICI.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of OFDM System over LEO Satellite Channel

El-Mahdy¹,

Mahran²,

Karem³

2008

The International Conference on Electrical Engineering

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In this paper an exact closed-form expression for the performance of the orthogonal frequency-division multiplexing (OFDM) system over LEO satellite channel is derived where each subcarrier is modulated by M-QAM. The effect of two channel parameters, namely the mean delay spread and maximum Doppler shift, on the system performance is investigated for a realistic wireless channel environment model.

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Section: Introductionmentioning

confidence: 99%

Performance Analysis of OFDM System over LEO Satellite Channel

El-Mahdy¹,

Mahran²,

Karem³

2008

The International Conference on Electrical Engineering

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“…According to (Papathanassiou et al, 2001), the Doppler shift exhibits a well-behaved and rather deterministic variation with time. If we assume the HAP station is not moving, the multipath signals arriving at the HAP demonstrate unequal but relative small Doppler shifts, which illustrates that the second Doppler spread component exhibits a relatively small value and can be modeled in accordance to the typical techniques employed in terrestrial mobile radio system (Palma-Lazgare & Delgado-Penin, 2006;Papathanassiou et al, 2001). In HAP-WSN applications, sensor nodes are mostly not capable of mobility and thus we don't take account of the movement of sensor nodes.…”

Section: Time-varying Hap Channel Characteristicsmentioning

confidence: 99%

“…Adjacent orthogonal subcarrier frequency separation B sub is equal to B/N, and is chosen to let each subcarrier experience a favourable frequency non-selective fading based on N. Usually N is chosen to make the minimum coherence bandwidth B c , which is approximately equal to the inverse of the maximum delay spread  m , 10 times higher than the B sub (Papathanassiou et al, 2001). …”

Section: Multiple Access Schemes Of Ofdmmentioning

confidence: 99%

“…In time domain, if the bandwidth of a signal is larger than the reciprocal of the maximum delay spread  m , each multipath signal can be modelled separately since different paths are resolvable. For a typical LEO channel, the  m ranges from 250 to 800 ns (Papathanassiou et al, 2001). Due to similarities of HAP and LEO satellites, we model the HAP channel as a slow-varying and frequency-selective fading channel.…”

Section: Time-varying Hap Channel Characteristicsmentioning

confidence: 99%

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Wireless Sensor Networks Applications via High Altitude Systems

Yang¹,

Mohammed²

2011

Emerging Communications for Wireless Sensor Networks

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“…Since complete switching is required in baseband OBP, FIR and FFT are still the basic modules. As introduced in [3,16,17], the orthogonal frequency division multiplexing (OFDM) technology is a very attractive candidate when targeting high quality and high flexibility in future mobile multimedia satellite communications systems, so FFT is still a necessary module. In addition, almost all the current mobile satellite communication systems (e.g.…”

Section: Introductionmentioning

confidence: 99%

Residue code based low cost SEU-tolerant fir filter design for OBP satellite communication systems

Yang

Gao

Chen

et al. 2012

J Wireless Com Network

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With the development of satellite communications, on-board processing (OBP) obtains more and more attentions due to the increased efficiency and performance. However, the large amounts of digital circuits in the OBP transponders are sensitive to the high-energy particles in space radiation environments, which may cause various kinds of single event effect. Among these effects, single event upset (SEU) is the major potential reason for the instability of the satellite communication systems. Triple modular redundancy (TMR) is a classical and effective method for mitigating the SEU in digital circuits. However, since three identical logic modules and a voting circuit are needed in TMR, the overhead is so high that the scheme may not be applicable on the on-board digital processing platform with very limited area and power resources. Therefore, how to design a more cost-effective fault-tolerant method becomes a critical issue. Considering that FIR-like processing is frequently used on OBP platform, in this article, a dual modules (DM) plus checking module based on residue code (DM-CRC) architecture for SEU-tolerant FIR design is proposed. Although this architecture reduces the area overhead dramatically, we find that the fault missing rate is still high if single-sample checking (SSC) is used. To solve this problem, a Multi-sample checking DM-CRC (MSC-DM-CRC) is further proposed. Our analysis shows that the MSC-DM-CRC scheme can make the fault missing rate small enough without reducing the actual throughput. By simulations it is shown that, when the modulus for CRC is 7 and the number of samples for MSC is 4, the reduction of area overhead relative to TMR is over 20% and the fault missing rate is as low as 0.05%.

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A comparison study of the uplink performance of W-CDMA and OFDM for mobile multimedia communications via LEO satellites

Cited by 41 publications

References 8 publications

Performance Analysis of OFDM System over LEO Satellite Channel

Performance Analysis of OFDM System over LEO Satellite Channel

Wireless Sensor Networks Applications via High Altitude Systems

Residue code based low cost SEU-tolerant fir filter design for OBP satellite communication systems

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