Optimal power adaptation for OFDM systems with ideal bit-interleaving and hard-decision decoding

Hunziker, Thomas; Dahlhaus, Dirk

doi:10.1109/icc.2003.1204084

Cited by 30 publications

(23 citation statements)

References 20 publications

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“…A similar comparison between adaptive modulation and static schemes is performed in [5], where a protocol extension to handle the corresponding overhead in case of adaptive modulation is proposed. Regarding power loading, optimal algorithms are investigated in [6] showing the potential of power loading for reducing the system's error rate in a general OFDM system, while [7] focuses specifically on an IEEE 802.11a system.…”

Section: A Related Workmentioning

confidence: 99%

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Performance Comparison of Loading Algorithms for 80 MHz IEEE 802.11 WLANs

Punal

Escudero

Gross

2011

2011 IEEE 73rd Vehicular Technology Conference (VTC Spring)

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Abstract-Wireless local area networks are known to apply the same transmit power and modulation type over all employed OFDM subcarriers. Recent studies [1] show that this can lead to significant performance degradations. As future WLANs will employ even larger bandwidths -80 MHz and above -we study in this paper loading strategies to improve the system performance. In particular, we study the performance of adaptive modulation, power loading and bit loading not only from the physical layer point of view but also by accounting for necessary protocol extensions to accommodate the required control overhead. Our studies reveal that, indeed, loading algorithms can provide significant performance improvements especially for 80 MHz systems. However, the selection of the most appropriate approach depends on channel, protocol and traffic parameters. Hence, this choice is not straightforward and has a substantial impact on the overall system's performance.

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Section: A Related Workmentioning

confidence: 99%

“…al in [6]. It consists of an iterative power loading algorithm that minimizes the uncoded bit-error rate for M-QAM modulations subject to a maximal power budget P max and under fixed modulation choice b n (and r n ) per subcarrier.…”

Section: A Transmission Approaches 1) Legacy Scheme or Static Schemementioning

confidence: 99%

Performance Comparison of Loading Algorithms for 80 MHz IEEE 802.11 WLANs

Punal

Escudero

Gross

2011

2011 IEEE 73rd Vehicular Technology Conference (VTC Spring)

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“…Because of the decoupling of the received information symbols in (14) and assuming independence between elements in a the mutual information between the transmitted symbols and the received signal vector can be expressed as the sum of the mutual information between elements of each vector:…”

Section: Achievable Rates Of Point-to-point Mimo-thpmentioning

confidence: 99%

MIMO-THP System with Imperfect CSI

Bizaki¹

2011

MIMO Systems, Theory and Applications

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“…In [15] and [16] the power is allocated to each carrier with the objective of minimizing the overall BER. The allocated power to each carrier is derived from [15]:…”

Section: Adaptive Power Allocationmentioning

confidence: 99%

Cognitive Radio Dynamic Access Techniques

Budiarjo

Лакшманан

Nikookar

2008

Wireless Pers Commun

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The ever growing demand for wireless services has placed enormous burden on valuable resources such as spectral bandwidth. This has resulted in a major rethinking in resource allocation policies culminating in an explosion of research activity in the field of Cognitive Radio (CR) towards optimum resource usage. In this tutorial paper the physical layer design and transmission techniques for CR in the context of efficient spectrum utilization are discussed. Spectrum sensing as the key element of CR awareness is described. Orthogonal frequency division multiplexing (OFDM) as a spectrally efficient modulation scheme is discussed and the rationale for its use in the CR system is explained. Spectrum pooling for efficient use of spectrum is studied and the role of adaptive OFDM techniques in this method is highlighted. Wavelet basis function as a replacement of Fourier transform in OFDM is evaluated. MIMO system as an added value to the CR performance is described. Adaptive Waveform and beamforming as alternative techniques in CR are reviewed.

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Optimal power adaptation for OFDM systems with ideal bit-interleaving and hard-decision decoding

Cited by 30 publications

References 20 publications

Performance Comparison of Loading Algorithms for 80 MHz IEEE 802.11 WLANs

Performance Comparison of Loading Algorithms for 80 MHz IEEE 802.11 WLANs

MIMO-THP System with Imperfect CSI

Cognitive Radio Dynamic Access Techniques

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