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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TL;DR: It is revealed that full time diversity order can be achieved, while full spatial diversity order is unreachable as compared to MIMO-HARQ systems without keyhole effect, and it is proved that the asymptotic outage probability is a monotonically increasing and convex function of the transmission rate.
Abstract: Vehicle-to-vehicle (V2V) communications under dense urban environments usually experience severe keyhole fading effect especially for multi-input multi-output (MIMO) channels, which degrades the capacity and outage performance due to the rank deficiency. To avoid these, the integration of MIMO and hybrid automatic repeat request (HARQ) is proposed to assist V2V communications in this paper. By using the methods of integral transforms, the outage probabilities are derived in closed-form for different HARQ-assisted schemes, including Type I-HARQ, HARQ with chase combining (HARQ-CC), and HARQ with incremental redundancy (HARQ-IR). With the results, meaningful insights are gained by conducting the asymptotic outage analysis. Specifically, it is revealed that full time diversity order can be achieved, while full spatial diversity order is unreachable as compared to MIMO-HARQ systems without keyhole effect. Moreover, we prove that the asymptotic outage probability is a monotonically increasing and convex function of the transmission rate. More importantly, although HARQ-IR performs better than HARQ-CC owing to its higher coding complexity, this advantage becomes negligible in the large-scale array regime. Finally, the numerical results are verified by Monte-Carlo simulations along with some in-depth discussions.
4 citations
TL;DR: Compared with some latest published FFT processors, synthesized results show the proposed FFT processor reduce the hardware overhead while improving the Signal-to-Noise Ratio (SNR).
Abstract: In this paper, we propose an enhanced hardware efficient CORDIC-based FFT processor. As the conventional CORDIC is restricted by the data precision and the times of iterations, Adaptive Recoding CORDIC (ARC) is adopted in our design, the bit error precision (BEP) of which is improved to 14 th . Simultaneously, Conflict-free parallel memory access scheme and Rom-free twiddle factor generation scheme are both introduced to improve the performance and reduce the memories to store the twiddle factors. Compared with some latest published FFT processors, synthesized results show the proposed FFT processor reduce the hardware overhead while improving the Signal-to-Noise Ratio (SNR). When the operating frequency is 250MHz, the proposed FFT processor performs radix-4 1024-point FFT every 5.4us. DOI: http://dx.doi.org/10.5755/j01.eee.19.4.1422
4 citations
06 Apr 2014
TL;DR: A modified dual decomposition method (MDDM) is proposed to solve the resource allocation problem, where the joint subcarrier assignment and power allocation are performed and a suboptimal algorithm (SOA) is presented to decouple the optimization problem into three sub-problems.
Abstract: This paper investigates coordinated resource allocation for cell-center and cell-edge users in multicell orthogonal frequency division multiple-access (OFDMA) wireless networks. Here, we assume the data symbols of each user is only known by one base station (BS). Referring to the fractional frequency reuse (FFR) scheme, the resources for cell-center and cell-edge users are partitioned. Based on such resource planning, the objective of our resource allocation scheme is to maximize both of cell-edge and cell-center users' throughput, subject to per base-station power constraints. Moreover, the proposed resource allocation scheme also considers the cell-center users' performance requirement. Note that the ratio of transmit powers for cell-center users to cell-edge users can be adjusted in FFR scheme, which is introduced in the so-called soft frequency reuse (SFR) scheme. We propose a modified dual decomposition method (MDDM) to solve the above-mentioned resource allocation problem, where the joint subcarrier assignment and power allocation are performed. To simplify the computation complexity, a suboptimal algorithm (SOA) is presented to decouple the optimization problem into three sub-problems. Simulation results demonstrate the efficacy of MDDM and SOA.
4 citations
Cites methods from "3G Evolution : HSPA and LTE for Mob..."
...The channel modeling parameters, including fast fading, shadow fading and path loss models, are set based on ITU channel model [13], [14]....
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26 Jun 2011
TL;DR: In this article, the received signal at the base station can be modeled using a tensor decomposition with constraints imposed on the control symbol matrix, and a receiver for joint multiuser channel estimation and detection is presented.
Abstract: This paper deals with a transmit diversity scheme to be applied in multiple-antenna signaling over the physical uplink control channel (PUCCH) of 3GPP LTE-Advanced (Release 10). Taking into account the signaling structure of this system, we show that received signal at the base station can be modeled using a tensor decomposition with constraints imposed on the control symbol matrix. By exploiting the proposed tensor model and its known structure, a receiver for joint multiuser channel estimation and detection is presented. The receiver is based on a semi-blind algorithm, by using known reference control symbols at the first iteration, and then proceeding with a data-aided channel and symbol estimation in subsequent iterations. Numerical results from Monte Carlo simulations are provided for performance assessment.
4 citations
01 Sep 2014
TL;DR: An improved LR-aided algorithm (ILRA) considering the feasible set of the new symbol has been proposed, which can achieve significant performance gain over the previous LR- aided LDs, especially in the low-order QAM system.
Abstract: Lattice reduction (LR) is a powerful technique for improving the performance of linear MIMO detection methods. The efficient LR algorithms can largely improve the performance of the linear detectors (LDs). However, there are two problems involved in the LR-aided detection algorithms. One is that, the reduced basis is still not orthogonal, and most existing LR-aided algorithms devote to find a near orthogonal matrix. The other one is that the original constellation is no longer the feasible set of the detected symbol, and the elements of the new symbol vector are correlated. In this paper, an improved LR-aided algorithm (ILRA) considering the feasible set of the new symbol has been proposed. We verify that the feasible set is the integer set in a polyhedron. Eliminating the integer constraint, we simplify the detection to a convex optimization problem. Finally, we get the new detected symbol by solving the convex optimization problem. The simulation results show that our algorithm can achieve significant performance gain over the previous LR-aided LDs, especially in the low-order QAM system.
4 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...Index Terms—MIMO detection, lattice reduction, feasible set, convex optimization I. INTRODUCTION Multiple-input multiple-output (MIMO) technology is maturing and is being incorporated into emerging wireless broadband standards like long-term evolution (LTE) [1]....
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...INTRODUCTION Multiple-input multiple-output (MIMO) technology is maturing and is being incorporated into emerging wireless broadband standards like long-term evolution (LTE) [1]....
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