Beyond 3G: wideband wireless data access based on OFDM and dynamic packet assignment

Chuang, J.C.-I.; Sollenberger, N.R.

doi:10.1109/35.852035

Cited by 265 publications

(96 citation statements)

References 8 publications

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“…By combining OFDM with CDMA, it has been synergistic effect, such as enhancement of robustness against frequency selective fading and high scalability in possible data transmission rate. OFDM can provide higher data rates as is a very good choice for service providers to compete with wire-line carriers [3]. The CDMA scheme is robust to frequency selective fading and has been successfully introduced in commercial cellular mobile communications systems such as Interim Standard-95 (IS-95) and 3G systems.…”

Section: Introductionmentioning

confidence: 99%

“…The robustness against frequency selective fading is very attractive, especially for high-speed data transmission [3] OFDM scheme has been well matured through research and development for high-rate wireless LAN s and terrestrial digital video broadcasting. By combining OFDM with CDMA, it has been synergistic effect, such as enhancement of robustness against frequency selective fading and high scalability in possible data transmission rate.…”

Section: Introductionmentioning

confidence: 99%

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Discrete Wavelet Transform Based Wireless Digital Communication Systems

Ali¹

2011

Discrete Wavelet Transforms - Theory and Applications

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Discrete Wavelet Transform Based Wireless Digital Communication Systems

Ali¹

2011

Discrete Wavelet Transforms - Theory and Applications

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“…B ROADBAND wireless access to the Internet has been the focus of research and development efforts of many research groups and organizations for the past few years, e.g., [2]- [6]. For example, reference [2] proposes a high speed asymmetrical wireless system based on EDGE uplink and OFDM downlink with the requirements envisioned for 3G systems in mind.…”

Section: Introductionmentioning

confidence: 99%

OFDM uplink for interactive broadband wireless: analysis and simulation in the presence of carrier, clock and timing errors

El-Tanany

Hazy

2001

IEEE Trans. on Broadcast.

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Abstract-This paper is concerned with the performance of OFDM when used as a modulation and access technique for the uplink of an interactive broadband wireless system or in the return link of a terrestrial television system. In such an application, the uplink performance becomes strongly dependent on the discrepancies related to carrier frequencies, sampling frequencies and time references used by different users. In addition, different uplink subcarriers will see different channels since individual subcarriers are allocated to different users. The main purpose of this paper is to provide the analytical tools necessary to quantify the performance of such an uplink by taking into consideration the error sources indicated above. The analysis is made from the uplink users' perspective; i.e., the results are presented with the subcarrier index as a parameter. Average uplink user performance is obtained by averaging over the tone index. Extensive computer simulations have been carried out and the results are in strong agreement with the analytical predictions.Index Terms-Broadband wireless systems, interactive broadband, modulation, OFDM, uplink synchronization.

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“…The eigenvalue λ max (∆A(U)) has an associated eigenvector with strictly positive entries. Furthermore, the minimum real λ for which 7 the inequality λp ≥ ∆A(U)p has solutions p > 0 is λ = λ max (∆A(U)). In our case, we start by finding the maximum real positive eigenvalue of ∆A(U) to request the existence of a power vector with positive entries.…”

Section: B Algorithm a 1) Beamforming Vector Adaptationmentioning

confidence: 99%

“…Multicode structures and different spreading gains per code enable the support of high data rates for 3G systems [6]. Orthogonal frequency division multiple access (OFDMA) is another proposed access and signaling scheme for wireless broadband networks [7]. OFDMA is included in the IEEE 802.11a [8] and ETSI HIPERLAN/2 standards for wireless local area networks (WLANs).…”

Section: Introductionmentioning

confidence: 99%

The impact of space division multiplexing on resource allocation: a unified approach

Koutsopoulos

Ren

Tassiulas

IEEE INFOCOM 2003. Twenty-Second Annual Joint Conference of the IEEE Computer and Communications Societies (IEEE Cat. No.03CH37

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Abstract-Recent advances in the area of wireless communications have revealed the emerging need for efficient wireless access in personal, local and wide area networks. Space division multiple access (SDMA) with smart antennas at the base station is recognized as a promising means of increasing system capacity and supporting rate-demanding services. However, the existence of SDMA at the physical layer raises significant issues at higher layers. In this paper, we attempt to capture the impact of SDMA on channel allocation at the media access control (MAC) layer. This impact obtains different forms in TDMA, CDMA and OFDMA access schemes, due to the different cochannel and inter-channel interference instances, as well as the different effect of corresponding channels (time slots, codes or subcarrier frequencies) on user channel characteristics. We follow a unified approach for these multiple access schemes and propose heuristic algorithms to allocate channels to users and adjust down-link beamforming vectors and transmission powers, with the objective to increase achievable system rate and provide QoS to users in the form of minimum rate guarantees. We consider the class of greedy algorithms, based on criteria such as minimum induced or received interference and minimum signal-to-interference ratio (SIR), as well as the class of SIR balancing algorithms. Our results indicate that this cross-layer approach yields significant performance benefits and that SIR balancing algorithms achieves the best performance.

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Beyond 3G: wideband wireless data access based on OFDM and dynamic packet assignment

Cited by 265 publications

References 8 publications

Discrete Wavelet Transform Based Wireless Digital Communication Systems

Discrete Wavelet Transform Based Wireless Digital Communication Systems

OFDM uplink for interactive broadband wireless: analysis and simulation in the presence of carrier, clock and timing errors

The impact of space division multiplexing on resource allocation: a unified approach

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