Multi-Antenna Techniques for Evolved 3G Wireless Communication Networks: An Overview
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paper_title: Preamble Design and System Acquisition in Ultra Mobile Broadband Communication Systems

paper_content:

The wide choices of deployment parameters in next generation wireless communication systems, such as flexible bandwidth allocation, synchronous/asynchronous modes, FDD/TDD, full/half duplex, and configurable cyclic prefix duration, etc., present significant challenges in preamble and system acquisition design. This paper addresses these challenges, as well as the solutions provided by the 3GPP2 Ultra Mobile Broadband (UMB) standard. The proposed preamble design facilitates the maximal flexibility of the system configuration and yet has low overhead, low acquisition latency, and low complexity. Although the design is discussed under the UMB context, it also serves as a preamble design paradigm for an OFDMA communication system in general.
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paper_title: A high-performance MIMO OFDM wireless LAN

paper_content:

Tremendous consumer interest in multimedia applications is fueling the need for successively higher data rates in wireless networks. Data rates in wireless wide area networks are limited by the need to address wide coverage, vehicular mobility, and the limitations of licensed spectrum. Thus, data rates in WWANs continue to lag advances in wireless local area networks by orders of magnitude. There are valuable lessons to be learned from the design of WLANs that provide data rates in excess of hundreds of megabits per second. Several technologies are instrumental in enabling the future of high-performance WWANs, including multiple transmit and receive antennas, OFDM, closed loop transmission control, and low-latency MAC operation. We describe a MIMO WLAN design and prototype that exploits these attributes to provide data rates in excess of 200 Mb/s above the MAC
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paper_title: MIMO-OFDM wireless systems: basics, perspectives, and challenges

paper_content:

Multiple-input multiple-output (MIMO) wireless technology in combination with orthogonal frequency division multiplexing (MIMO-OFDM) is an attractive air-interface solution for next-generation wireless local area networks (WLANs), wireless metropolitan area networks (WMANs), and fourth-generation mobile cellular wireless systems. This article provides an overview of the basics of MIMO-OFDM technology and focuses on space-frequency signaling, receiver design, multiuser systems, and hardware implementation aspects. We conclude with a discussion of relevant open areas for further research
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paper_title: MIMO-OFDM wireless systems: basics, perspectives, and challenges

paper_content:

Multiple-input multiple-output (MIMO) wireless technology in combination with orthogonal frequency division multiplexing (MIMO-OFDM) is an attractive air-interface solution for next-generation wireless local area networks (WLANs), wireless metropolitan area networks (WMANs), and fourth-generation mobile cellular wireless systems. This article provides an overview of the basics of MIMO-OFDM technology and focuses on space-frequency signaling, receiver design, multiuser systems, and hardware implementation aspects. We conclude with a discussion of relevant open areas for further research
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paper_title: Channelization in Ultra Mobile Broadband Communication Systems: The Reverse Link

paper_content:

This paper describes the channelization method for the reverse link of ultra mobile broadband (UMB) communication systems. It is optimized for encoding/decoding processing time, diversity (especially for latency sensitive data), peak-to-average ratio, link budget (i.e., minimum rate at cell edge), access terminal memory requirements, scalability across various deployment bandwidths to achieve high throughput and highly reliable wireless communications.
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paper_title: Generalized Linear Precoder and Decoder Design for MIMO Channels Using the Weighted MMSE Criterion

paper_content:

We address the problem of designing jointly optimum linear precoder and decoder for a MIMO channel possibly with delay-spread, using a weighted minimum mean-squared error (MMSE) criterion subject to a transmit power constraint. We show that the optimum linear precoder and decoder diagonalize the MIMO channel into eigen subchannels, for any set of error weights. Furthermore, we derive the optimum linear precoder and decoder as functions of the error weights and consider specialized designs based on specific choices of error weights. We show how to obtain: (1) the maximum information rate design; (2) QoS-based design (we show how to achieve any set of relative SNRs across the subchannels); and (3) the (unweighted) MMSE and equal-error design for fixed rate systems.
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paper_title: Channelization in Ultra Mobile Broadband Communication Systems: The Forward Link

paper_content:

This paper describes the channelization method for the reverse link of ultra mobile broadband (UMB) communication systems. It is optimized for encoding/decoding processing time, diversity (especially for latency sensitive data), peak-to-average ratio, link budget (i.e., minimum rate at cell edge), access terminal memory requirements, scalability across various deployment bandwidths to achieve high throughput and highly reliable wireless communications.
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paper_title: Channelization in Ultra Mobile Broadband Communication Systems: The Forward Link

paper_content:

This paper describes the channelization method for the reverse link of ultra mobile broadband (UMB) communication systems. It is optimized for encoding/decoding processing time, diversity (especially for latency sensitive data), peak-to-average ratio, link budget (i.e., minimum rate at cell edge), access terminal memory requirements, scalability across various deployment bandwidths to achieve high throughput and highly reliable wireless communications.
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Title: Multi-Antenna Techniques for Evolved 3G Wireless Communication Networks: An Overview

Section 1: INTRODUCTION
Description 1: This section introduces the basic concepts of OFDMA and MIMO techniques for high data rate wireless communications and outlines the objectives and challenges of multi-antenna techniques in evolved 3G standards.

Section 2: MIMO SPATIAL MULTIPLEXING
Description 2: This section reviews the basic MIMO spatial multiplexing structures, their limitations, and presents the rank prediction solution.

Section 3: PRECODING
Description 3: This section discusses the precoding techniques used to improve MIMO performance, especially at low SNRs, and explains the trade-off between precoding gains and feedback overhead.

Section 4: SPACE DIVISION MULTIPLE ACCESS (SDMA)
Description 4: This section describes the SDMA techniques for both forward and reverse links, focusing on how they increase system throughput by enabling simultaneous transmission to/from several users in the same time-frequency slot.

Section 5: MIMO PILOTS
Description 5: This section discusses the design of special pilots needed for MIMO channel estimation at the receiver, using UMB MIMO pilots as an example.

Section 6: CONCLUSION
Description 6: This section provides the conclusion, summarizing the advantages and challenges of employing advanced multiple antenna techniques in evolved 3G wireless communication systems.
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