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Author: farhad zarringhalam

Farhad Zarringhalam is a researcher and technology professional
focused on engineering research, digital transformation and innovation.
He contributes to IEEEHub with articles about technology, research and international projects.

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Articles

Joint optimisation of spreading factor and outerloop power control for DS-CDMA

by farhad zarringhalam

Published in: VTC-2005-Fall. 2005 IEEE 62nd Vehicular Technology Conference, 2005. Date of Conference: 28-28 September 2005 Date Added to IEEE Xplore: 16 January 2006 Print ISBN:0-7803-9152-7 Print ISSN: 1090-3038 Introduction CDMA systems are capacity limited by the maximum tolerable level of interference received at the cellular base station (BS). This multiple access interference (MAI) or multiuser interference (MUI) imposes an […]

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Articles

Adaptive Resource Allocation for Spectral Efficiency Maximization in Uplink WCDMA

by farhad zarringhalam

In this contribution we examine the joint optimization of the outer-loop power control (OLPC) and spreading factor in order to improve the spectral efficiency in the uplink of wideband code-division multiple-access (WCDMA) systems, in the presence of additive white Gaussian noise (AWGN) and multiple access interference (MAI), and while maintaining an average transmit power constraint. […]

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Articles

Adaptive Power and Rate Transmission with Single and Multi-User Detection

by farhad zarringhalam

We propose a technique for enhancing the achievable spectral efficiency of multiuser direct-sequence code-division multiple-access (DS-CDMA) channels in the presence of additive white Gaussian noise (AWGN) and multiple access interference (MAI). The proposed scheme is the joint optimization of outer loop power control and variable spreading factors (VSFs). The optimum SNR-target, the SNR that results […]

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Articles

Jointly optimized rate and outer loop power control with single- and multi-user detection

by farhad zarringhalam

We propose a technique for enhancing the achievable spectral efficiency of multiuser direct-sequence code-division multiple-access (DS-CDMA) fading channels in the presence of additive white Gaussian noise (AWGN) and multiple access interference (MAI). The proposed scheme involves the joint optimization of outer loop power control (OLPC) and rate control using variable spreading factors (VSFs). The optimality […]

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Articles

Joint Physical Layer and Data Link Layer Optimization of CDMA-Based Networks

by farhad zarringhalam

In CDMA systems, outer loop power control (OLPC) determines the target value of SNR at the receiver, mostly by using look-up tables to map bit error rates (BERs) to SNR-targets. In this contribution, transmission delay and packet loss rate constraints in the data link layer (DLL) are invoked in order to determine the optimum outer […]

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Articles

Packet Error Rate(PER)-Based Cross-Layer Optimization of CDMA Networks

/ by farhad zarringhalam

In CDMA systems, outer loop power control (OLPC) determines the target value of SNR at the receiver, mostly by using look-up tables to map bit error rates (BERs) to SNRtargets. In this contribution, transmission delay and packet loss rate constraints in the data link layer (DLL) are invoked in order to determine the optimum outer […]

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Articles

Throughput-optimal cross-layer resource allocation in DS-CDMA systems with Nakagami multipath fading

/ by farhad zarringhalam

Joint optimization of outer loop power control (OLPC) signal to noise ratio-target (SNR-target) and variable spreading factor (VSF), at the physical(PHY)-layer, with truncated automatic repeat request (ARQ), at data link layer (DLL), in accordance to the number of active users in the cell is considered. This investigation is on a single cell conventional cellular DS-CDMA […]

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