Advanced Wireless Networks: 4G Technologies

Glisic, Savo; Mäkelä, Juha-Pekka

doi:10.1109/isssta.2006.311811

Cited by 51 publications

(47 citation statements)

References 7 publications

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“…Future wireless communications will utilize frequency multiplexing and spatial multiplexing to realize ultra high speed data communications [1]. Joint maximum likelihood (ML) decoding with high complexity is required to mitigate multiple access interference and attain the greatest possible frequency and spatial multiplexing gains.…”

Section: Introductionmentioning

confidence: 99%

Asymptotic Analysis of General Multiuser Detectors in MIMO DS-CDMA Channels

Takeuchi¹,

Tanaka²,

Yano

2008

IEEE J. Select. Areas Commun.

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We analyze a MIMO DS-CDMA channel with a general multiuser detector including a nonlinear multiuser detector, using the replica method. In the many-user, limit the MIMO DS-CDMA channel with the multiuser detector is decoupled into a bank of single-user SIMO Gaussian channels if a spatial spreading scheme is employed. On the other hand, it is decoupled into a bank of single-user MIMO Gaussian channels if a spatial spreading scheme is not employed. The spectral efficiency of the MIMO DS-CDMA channel with the spatial spreading scheme is comparable with that of the MIMO DS-CDMA channel using an optimal space-time block code without the spatial spreading scheme. In the case of the QPSK data modulation scheme the spectral efficiency of the MIMO DS-CDMA channel with the MMSE detector shows waterfall behavior and is very close to the corresponding sum capacity when the system load is just below the transition point of the waterfall behavior. Our result implies that the performance of a multiuser detector taking the data modulation scheme into consideration can be far superior to that of linear multiuser detectors. Index TermsMultiple-input multiple-output (MIMO) systems, direct-sequence code-division multiple access (DS-CDMA), asymptotic analysis, multiuser detection, replica method.K. Takeuchi is with the

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Section: Introductionmentioning

confidence: 99%

Asymptotic Analysis of General Multiuser Detectors in MIMO DS-CDMA Channels

Takeuchi¹,

Tanaka²,

Yano

2008

IEEE J. Select. Areas Commun.

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“…The APP layers at the source and destination hosts of Fig.1 are equipped with playin and playout buffers of finite capacities N 1 and N 2 , respectively. The number of information units (IUs) arriving at the input of the playin buffer at the end of slot t is the playin rate λ(t) ∈ R + 0 (IU/slot) at slot t. The underlying wireless physical channel supporting the peer-to-peer pipe of Fig.1 is affected by interference, noise and fading phenomena, we assume constant over each slot (i.e., we assume an ergodic "block fading" physical channel [12]). Hence, the resulting state σ(t) ∈ R + 0 at the t-th slot of the overall pipe is modelled as a real-valued nonnegative r.v.…”

Section: Qos Real-time Streaming: System and Traffic Modelingmentioning

confidence: 99%

Stochastic Traffic Engineering for Live Audio/Video Delivering over Energy-Limited Wireless Access Networks

2011

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Abstract. We study the Stochastic Traffic Engineering (STE) problem arising from the support of QoS-demanding live (e.g., real time) audio/video applications over unreliable IP-over-wireless access pipes. First, we recast the problem to be tackled in the form of a suitable nonlinear stochastic optimization problem, and then we develop a goodput analysis for the resulting IP-over-wireless pipe that points out the relative effects of fading-induced errors and congestion-induced packet's losses. Second, we present an optimal resource-management policy that allows a joint scheduling of playin, transmit and playout rates. Salient features of the developed joint scheduling policy are that: i) it is self-adaptive; and, ii) it is able to implement reliable Constant Bit Rate (CBR) connections on the top of unreliable energy-limited wireless pipes.

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“…It is based on a combination of the Code Division Multiple Access (CDMA) scheme and Orthogonal Frequency Division Multiplexing (OFDM) signaling. MC-CDMA transmitter spreads the original signal using a given spreading code in the frequency domain (Glisic, 2004). Fraction of the symbol is converted into chip of the spreading code and transmitted through a different subcarrier which is used to design a secured wireless system.…”

Section: Introductionmentioning

confidence: 99%

Improving the Performance and Reducing Bit Error Rate on Wireless Deep Fading Environment Receivers

Jayanthi¹

2014

Journal of Computer Science

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One of the major challenges in wireless communication system is increasing complexity and reducing performance in detecting the received digital information in indoor and outdoor Environments. Consequently to overcome this problem we analyze the delay performance of a multiuser with perfect channel state information transmitting data on deep fading environment. In this proposed system, the Wireless Deep Fading Environment (WDFE) creation for causing a Nakagami Multipath Fading Channel of fading figure 'm' is used to rectify the delay performance over the existing Rayleigh fading channel. In this WDFE receivers received coherent, synchronized, secured and improved signal strength of information using a Multiuser Coherent Joint Diversity (MCJD) with Multi Carrier-Code Division Multiple Access (MC-CDMA). The MCJD in 'M' branch of antennas are used to reduce the Bit Error Rate (BER) and MC-CDMA method is used to improve the performance. Therefore, in this proposed system we accompany with MCJD and MC-CDMA is very good transceiver for next generation wireless system of an existing 3G wireless system. Overall, this experimental results show improved performance in different multiuser wireless systems under different multipath fading conditions.

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Advanced Wireless Networks: 4G Technologies

Cited by 51 publications

References 7 publications

Asymptotic Analysis of General Multiuser Detectors in MIMO DS-CDMA Channels

Asymptotic Analysis of General Multiuser Detectors in MIMO DS-CDMA Channels

Stochastic Traffic Engineering for Live Audio/Video Delivering over Energy-Limited Wireless Access Networks

Improving the Performance and Reducing Bit Error Rate on Wireless Deep Fading Environment Receivers

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