Downlink Throughput Enhancement of a Cellular Network using Two-Hop User-Deployable Indoor Relays

Devar, Sendil Kumar; Karthik, K.; Ramamurthi, Bhaskar; Koilpillai, R. David

doi:10.1109/jsac.2013.130822

Cited by 4 publications

(6 citation statements)

References 24 publications

(41 reference statements)

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“…Authors of have proposed the concept of Relay Stations (RSs), while Femto Base Station (FBS) deployment at the end user site have been proposed in as viable solutions. Both RS and FBS are connected to the Macro Base Station (MBS) and can provide extended coverage.…”

Section: Introductionmentioning

confidence: 99%

Joint location and power optimisation of femto base stations to improve indoor coverage: a geometric approach

Kundu¹,

Sanyal

Misra

2016

Trans. Emerging Tel. Tech.

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Femto base station (FBS) deployment with existing Macro Base Stations improves Quality of Service of end users in dead‐zone while simultaneously increasing co‐channel femto–femto interference. This necessitates judicious planning before FBS deployment. In this paper, a novel geometric approach to model any 3‐D deployment region along with two particle swarm optimisation based joint location and power optimisation algorithms: LOA‐POA and LPOA are proposed. The geometric plan of the deployment region (with multiple multistoried buildings) with 3‐D coordinates of serving‐MBS has been generated and provided as input to LOA‐POA and LPOA, to identify positions and transmission powers of the FBSs required to maximise coverage. For a significantly large deployment region of 1600 sq. m., the LPOA identifies locations and transmission powers of four co‐channel FBSs within 140 s while LOA‐POA identifies the same for five FBSs within 40 s. Simulation exhibits requisite coverage after FBS installation. Comparison of these algorithms has been carried out with existing works considering different wall materials. LPOA is observed to provide most economic solution but with higher convergence time than LOA‐POA. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Joint location and power optimisation of femto base stations to improve indoor coverage: a geometric approach

Kundu¹,

Sanyal

Misra

2016

Trans. Emerging Tel. Tech.

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“…However, combating the accumulated channel effect at destination naturally increases the processing complexity as well as the power consumption of mobile terminals. An alterative method to eliminate the channel accumulation is to adopt equalization techniques at the relay node . A time‐domain channel estimation scheme was proposed for the relay node in .…”

Section: Introductionmentioning

confidence: 99%

“…A time‐domain channel estimation scheme was proposed for the relay node in . In , the equalizer exploited at relay node is designed for two‐hop multiple‐input multiple‐output relay systems.…”

Section: Introductionmentioning

confidence: 99%

A two-hop equalize-and-forward relay scheme in OFDM-based wireless networks over multipath channels

Gao

Wang

Leung

2015

Wirel. Commun. Mob. Comput.

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Relay communications have attracted increasing research attentions as a cost-effective technique to improve spatial diversity, service coverage, and energy efficiency in wireless networks. However, existing relay schemes (e.g., amplifyand-forward and decode-and-forward (DF) schemes) still face several major challenges, particularly the accumulation of multipath channels effect in AF and long processing latency in DF. To address these issues, we propose a novel equalizeand-forward (EF) relay scheme to enhance the retransmission reliability while maintaining low processing delay at the relay node. In particular, the proposed EF relay estimates and equalizes the channel between source and relay to eliminate the channel accumulation effect without signal regeneration. To further reduce the relay processing time, the channel estimation and equalization in the proposed EF design are performed in parallel. The proposed equalization is realized by presetting the equalizer coefficients with the current channel response that is predicted in parallel using multiple past channel responses. Numerical results show that the proposed EF relay scheme can achieve comparable symbol error rate performance as the DF relay with much less relay latency. In addition, the EF relay exhibits low outage probability at the same data rate as compared with traditional amplify-and-forward and DF schemes.

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“…Hence, recent research proposes the use of various signal processing and interference management techniques when relays are deployed in cellular systems [3], [10]. In [11], we proposed userdeployable indoor relays that equalize the received signal before forwarding, as applicable to a CDMA network.…”

Section: Introductionmentioning

confidence: 99%

“…In the CDMA indoor relaying proposed in [11], the relay is non-transparent, and the UE has to necessarily attach itself to the relay. The indoor relays in this work are transparent to and backward compatible with the legacy UEs in an LTE (OFDMA) network.…”

Section: Introductionmentioning

confidence: 99%

Downlink throughput enhancement of an OFDMA cellular system with closed-access indoor relays

Karthik

Ramamurthi

2013

2013 IEEE 14th Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

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We propose user-deployable closed-access indoor relays for throughput improvements in the downlink of LTE (long-term evolution) cellular system. The relays are assumed to be placed proximate to the destination user equipments (UEs). We propose a two-hop non-regenerative relaying scheme where the relay, equipped with multiple antennas, performs optimum combining to maximize the SINR (signal-to-interference-plusnoise ratio) before forwarding to a UE. The relaying is performed in a concurrent manner, where the base station (BS) transmits to some other receiver simultaneously when the relay is transmitting, and is therefore spectrally efficient. In order that the users served by a BS do not experience additional co-channel interference (CCI) because of the transmissions of the closedaccess relays, we present an interference management scheme that can be implemented with minimal changes in the scheduling algorithm of a BS. Computer simulations, performed with largescale deployment of indoor relays in the LTE framework, show that the UEs served by the relays see an improvement of over 100% in their respective throughputs, while the average cellular throughput improves by 24% when compared with a baseline system without relays. Also, the UEs served by the BSs do not experience any loss in their throughputs.Index Terms-Indoor relays, interference management, LTE

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Downlink Throughput Enhancement of a Cellular Network using Two-Hop User-Deployable Indoor Relays

Cited by 4 publications

References 24 publications

Joint location and power optimisation of femto base stations to improve indoor coverage: a geometric approach

Joint location and power optimisation of femto base stations to improve indoor coverage: a geometric approach

A two-hop equalize-and-forward relay scheme in OFDM-based wireless networks over multipath channels

Downlink throughput enhancement of an OFDMA cellular system with closed-access indoor relays

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