Book•
3G Evolution : HSPA and LTE for Mobile Broadband
31 Jul 2007-
TL;DR: In this paper, the authors present a very up-to-date and practical book, written by engineers working closely in 3GPP, gives insight into the newest technologies and standards adopted by threeGPP with detailed explanations of the specific solutions chosen and their implementation in HSPA and LTE.
Abstract: This very up-to-date and practical book, written by engineers working closely in 3GPP, gives insight into the newest technologies and standards adopted by 3GPP, with detailed explanations of the specific solutions chosen and their implementation in HSPA and LTE. The key technologies presented include multi-carrier transmission, advanced single-carrier transmission, advanced receivers, OFDM, MIMO and adaptive antenna solutions, advanced radio resource management and protocols, and different radio network architectures. Their role and use in the context of mobile broadband access in general is explained. Both a high-level overview and more detailed step-by-step explanations of HSPA and LTE implementation are given. An overview of other related systems such as TD SCDMA, CDMA2000, and WIMAX is also provided.This is a 'must-have' resource for engineers and other professionals working with cellular or wireless broadband technologies who need to know how to utilize the new technology to stay ahead of the competition.The authors of the book all work at Ericsson Research and are deeply involved in 3G development and standardisation since the early days of 3G research. They are leading experts in the field and are today still actively contributing to the standardisation of both HSPA and LTE within 3GPP. * Gives the first explanation of the radio access technologies and key international standards for moving to the next stage of 3G evolution: fully operational mobile broadband* Describes the new technologies selected by the 3GPP to realise High Speed Packet Access (HSPA) and Long Term Evolution (LTE) for mobile broadband * Gives both higher-level overviews and detailed explanations of HSPA and LTE as specified by 3GPP
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01 Dec 2014
TL;DR: The closed-form expressions for the Cramér-Rao lower bounds (CRLBs) of the signal-to-noise ratio (SNR) estimates from turbo-coded square-QAM transmissions are derived for the first time by exploiting the structure of the Gray mapping and linearizing all the derivation steps for the FIM elements.
Abstract: In this contribution, we derive for the first time the closed-form expressions for the Cramer-Rao lower bounds (CRLBs) of the signal-to-noise ratio (SNR) estimates from turbo-coded square-QAM transmissions. By exploiting the structure of the Gray mapping, we are able to factorize the likelihood function thereby linearizing all the derivation steps for the FIM elements. The analytical CRLBs coincide exactly with their empirical counterparts validating thereby our new analytical expressions. Numerical results suggest that the CLRBs for code-aided (CA) SNR estimates range between the CRLBs for non-data-aided (NDA) SNR estimates and those for data-aided (DA) ones, thereby highlighting the effect of the coding gain. At sufficiently high SNR levels, the three CRLBs coincide. The derived bounds are also valid for LDPC-coded systems and they can be evaluated in the same way when the latter are decoded using the turbo principal.
4 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...In order to satisfy the ever increasing demand in high data rates, the use of turbo codes in conjunction with high-order QAMs has been already adopted in many current and upcoming wireless communication standards such as 4G long-term evolution (LTE), LTE-advanced (LTE-A) and beyond (LTE-B) [6, 7]....
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TL;DR: The Best CQI and Round Robin scheduling algorithms were investigated and the impact of the scheduling schemes on the throughput was examined and the fairness of each scheduling scheme was investigated.
Abstract: LTE is the evolution of the Universal Mobile Telecommunications System (UMTS). LTE intends to create a new radio-access technology which will provide high data rates, a low latency and a greater spectral efficiency. The downlink physical resource of the LTE is represented as a time-frequency resource grid consisting of multiple Resource Blocks (RB). A scheduler is a key element in the Base Station (BS) and it assigns the time and frequency resources to different users in the cell. In this thesis the Best CQI and Round Robin scheduling algorithms were investigated. The implementation, analysis and comparison of both scheduling algorithms were done through simulations executed on a MATLAB-based downlink link level simulator from the Vienna University. The impact of the scheduling schemes on the throughput was examined and the fairness of each scheduling scheme was investigated.
4 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...The previously served user will be placed at the end of the waiting queue to be served again in the next round....
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Patent•
30 Dec 2008TL;DR: In this paper, the authors describe methods and systems for obscuring network topologies by modifying cell identities to obscure a relationship between nodes in a communication system and their geographical location, e.g., cell plan lists, cell neighbor lists and cell identities.
Abstract: Methods and systems for obscuring network topologies are described. Cell re-planning techniques can be used to modify cell identities to obscure a relationship between nodes in a communication system and their geographical location. One or more algorithms can be used to operate on, e.g., cell plan lists, cell neighbor lists and/or cell identities.
4 citations
29 May 2012
TL;DR: This paper investigated the traditional method to determine Physical Downlink Control Channel format and Control Format Indicator (CFI) value in LTE (Long Term Evolution) system and proposed a modified method that can effectively eliminate the average number of PDCCH blind detection.
Abstract: This paper investigated the traditional method to determine Physical Downlink Control Channel (PDCCH) format and Control Format Indicator (CFI) value in LTE (Long Term Evolution) system. A modified method to calculate CFI value and the PDCCH format was proposed. Firstly, this method determined the PDCCH format based on the channel conditions, and then calculated the number of Resource Elements (RE) occupied by all the downlink control channels and reference signals. Finally, determined the CFI value based on the calculated number. The simulation results show that this modified method can effectively eliminate the average number of PDCCH blind detection.
4 citations
10 Jun 2014
TL;DR: The analysis of the performance of hybrid automatic repeat request with incremental redundancy (HARQ-IR) in a mobile ad hoc network (MANET) indicates that a certain small number of retransmissions is sufficient to achieve the maximal transmission capacity.
Abstract: In this paper, the performance of hybrid automatic repeat request with incremental redundancy (HARQ-IR) in a mobile ad hoc network (MANET) is analyzed. Based on the theory of stochastic geometry, both interference and the randomness in nodes' locations are incorporated into our analysis. The outage probability after the kth retransmission is analyzed and the outage performance of HARQ-IR is compared with that of Type-I HARQ and HARQ with chase combining (HARQ-CC). Our analysis reveals that the performance gains of HARQ-IR over Type-I HARQ and HARQ-CC increase with the number of retransmissions while they decrease with the path loss exponent. The network throughput in terms of transmission capacity is also analyzed. The results indicate that a certain small number of retransmissions is sufficient to achieve the maximal transmission capacity. Meanwhile, the optimal intensity of source nodes to maximize the transmission capacity is shown to be within a specific interval.
4 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...INTRODUCTION Hybrid automatic repeat request (HARQ) has been adopted in various systems, such as 3GPP long term evolution (LTE) and worldwide interoperability for microwave access (WiMAX), to improve quality-of-service (Qos) as well as spectral efficiency [1]....
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...Once sufficient redundancy is accumulated at the receiver, the information can be successfully decoded [1]....
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