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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Patent•
03 Jan 2012TL;DR: In this article, the authors proposed link adaptation in a wireless communication system for simultaneous transmission of codewords, including selecting initial modulation and coding scheme (MCS) levels, estimating a size ratio of the codeword, determining a number of scheduling blocks, and determining revised MCS levels in response to the determined number of SBs.
Abstract: Methods of performing link adaptation in a wireless communication system for simultaneous transmission of codewords include selecting initial modulation and coding scheme (MCS) levels for the codewords, estimating a size ratio of the codewords, determining a number of scheduling blocks (SB) for the codewords with the initial MCS levels, and determining revised MCS levels for the codewords in response to the determined number of SBs. Transport block sizes are computed for the codewords, and it is determined if there is a need to increase the number of scheduling blocks in at least one of the codewords. If there is a need to increase the number of scheduling blocks in a codeword, scheduling blocks are added to the codeword, and the transport block size for the codeword is recomputed. The codewords are then simultaneously transmitted over different multiple input-multiple output (MIMO) communication channels using the same time and frequency resources.
20 citations
TL;DR: A user-centric downlink cooperative transmission scheme with orthogonal beamforming based limited feedback, where the cooperative clusters of multiple users may overlap and per-cell codebooks are considered is proposed.
Abstract: With the increase of cell density and explosive growth of data traffic, user centric is becoming one of the design principles of next-generation cellular networks. One meaning of user centric lies in that no matter where a user is located, its demand in quality of service (QoS) will be guaranteed in high probability. One approach to achieve such an ambitious goal is allowing each user to select several preferred base stations to transmit cooperatively. In this paper, we propose a user-centric downlink cooperative transmission scheme with orthogonal beamforming based limited feedback, where the cooperative clusters of multiple users may overlap and per-cell codebooks are considered. To assist the central unit (CU) for scheduling users with guaranteed QoS and performing adaptive transmission, a method for each user to estimate its signal-to-noise-and-interference ratio is derived. Targeting to ensure the required QoS of multiple users, we propose a method to select the cooperative cluster at each user and provide a method to schedule users based on their service priorities and channel conditions at the CU, where the clusters are selected semidynamically. Simulation results show that the proposed scheme significantly increases the percentage of users with satisfactory QoS demands.
20 citations
TL;DR: A layered space shift keying modulation scheme to fully exploit the spatial domain to transmit information bits, where a layered architecture is developed to achieve spatial multiplexing transmission in an SSK system and outperforms other existing MIMO schemes.
Abstract: Space shift keying (SSK) modulation is an emerging transmission technique for multiple-input multiple-output (MIMO) wireless channels, which exploits the spatial domain to convey information. In this paper, we present a layered space shift keying (LSSK) modulation scheme to fully exploit the spatial domain to transmit information bits, where a layered architecture is developed to achieve spatial multiplexing transmission in an SSK system. Specifically, LSSK leverages the rotated signals predetermined at the transceiver to identify different layers and improve the bit-error-rate (BER) performance. The layered signals are directly generated by the proposed LSSK modulation method with a low computational overhead. Furthermore, we propose a layered-and-joint (LJ) near-optimal detection algorithm based on the layered architecture of LSSK to reduce the detection complexity. In LJ detection, layered detection is performed to find a set of detection candidates for each layer, and then, joint detection is performed with these candidates. We show that the performance of LJ detection is quite close to that of optimal maximum-likelihood detection with significantly reduced detection complexity for high-spectrum-efficiency scenarios. Results demonstrate that the proposed LSSK scheme substantially improves the spectrum efficiency of an SSK system and outperforms other existing MIMO schemes.
20 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...THE increasing requirements of high data rate and high spectrum efficiency have led to extensive research on multipleinput multiple-output (MIMO) techniques [1], [2]....
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TL;DR: Investigation of the achievable sum rates and energy efficiency of a downlink single cell M-MIMO systems utilizing linear and nonlinear precoding schemes and the tradeoff among the energy efficiency, sum rate and the system users show that substantial energy efficiency improvements can be achieved when non-linear successive interference cancellation precoding is applied compared to linear precode schemes.
Abstract: To meet up with the ever increasing subscribers' demand for higher data rates and mobile data traffic growth in the telecommunication industry, the fifth generation (5G) systems is being considered for the next future cellular communication standards The two principal design requirements being aimed at in 5G are robust data transmission rates in Gigabits and low power consumption systems Massive multiple input multiple output (M-MIMO) technology is an evolving smart antenna technology which has some key promising potentials to boost 5G networks in meeting the aforementioned requirements However, there is an emergent concern that increased number of antenna arrays in M-MIMO system could induce high power consumption and poor energy efficiency when deployed at the base stations (BSs) Also, inter-cellular interference which occurs as a result of pilot contamination, fast fading and uncorrelated noise effects in the radio channels are other open issues in M-MIMO system This work investigates and compare the achievable sum rates and energy efficiency of a downlink single cell M-MIMO systems utilizing linear and nonlinear precoding schemes First, we have shown how the increasing signal-to-noise ratio and M-antennas impact the achievable sum rates Furthermore, the energy saving potentials of M-MIMO systems in macro, micro and pico cellular environments when linear and nonlinear precoding schemes are utilized at the BS have been demonstrated Particularly, by means of power fairness index, the tradeoff among the energy efficiency, sum rate and the system users have also been presented and discussed Results show that substantial energy efficiency improvements can be achieved in micro and pico cellular environments of downlink M-MIMO systems when non-linear successive interference cancellation precoding is applied compared to linear precoding schemes
19 citations
Cites methods from "3G Evolution : HSPA and LTE for Mob..."
...Presently, the MIMO technology has been incorporated into HSPA+ and LTE broadband cellular systems, based on 3GPP standard [2, 3] and other wireless standards such as WiMAX, 802....
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TL;DR: This paper presents a networked controller for packet data queue level control between two nodes with an Internet connection, employing a robust feedback together with a faster feedforward from the measured bitrate emptying the queue.
Abstract: This paper presents a networked controller for packet data queue level control between two nodes with an Internet connection. A wireless radio interface empties the packet queue. The control signal is the bitrate from the transmitting node over the Internet connection to the receiving node in which the controlled queue is located. The output signal is the packet dwell time in the packet queue. The networked controller needs to be robust with respect to large and unknown transmission and measurement delays over the Internet. A continuous-time frequency-domain design technique is therefore selected, employing a robust feedback together with a faster feedforward from the measured bitrate emptying the queue. The control signal is limited to positive values since data can only be sent toward the receiving node. Conditions for $\mathcal {L}_{2}$ stability of the networked controller are given by an application of the Popov criterion. Furthermore, the Popov inequality is exploited for robust controller tuning, precomputing the associated stability region. The practical performance in a third-generation cellular radio application is verified by simulation, laboratory measurements, and field trials. Substantial improvements in capacity and robustness were obtained.
19 citations
Cites background or methods from "3G Evolution : HSPA and LTE for Mob..."
...Note that in addition to the rate-based flow control principle used in this paper, window-based methods are also common in the Internet [35]....
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...The Internet application then reduces the bitrate....
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...Unfortunately, AQM in WCDMA is not enough to control the queues when the round-trip time is large and when an Internet application starts many parallel TCP flows....
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...It should be noted that this assumes that the delays of the loop are constant, which is not the case for the wireless Internet....
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...Furthermore, the present Internet applications often tend to start many data flows almost simultaneously....
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