Time Reversal and Zero-Forcing Equalization for Fixed Wireless Access Channels

Kyritsi, P.; Stoica, Petre; Papanicolaou, George; Eggers, Patrick Claus F.; Oprea, A.

doi:10.1109/acssc.2005.1599972

Cited by 35 publications

(29 citation statements)

References 9 publications

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“…These experimental studies were mainly performed in the ISM (industrial, scientific, and medical) band 5 GHz radio systems with a bandwith from 20 to 100 MHz [131,132,178,179,289], where remarkable temporal focusing (delay spread reduction) and spatial focusing (low spatial interference) in the context of wideband MISO systems are demonstrated. In [133,134,135], several equalizers, designed in both time domain and frequency domain, were proposed. In [180], a new space-time multiplexing scheme was proposed to reduce the multiuser interference (MUI) by carefully choosing the offset time in each branch of the TR filter of the MISO system.…”

Section: Ultra Wideband Systems With Mimo Thomas Kaiser and Feng Zhenmentioning

confidence: 99%

Ultra Wideband Systems with MIMO

Kaiser¹,

Zheng²

2010

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Section: Ultra Wideband Systems With Mimo Thomas Kaiser and Feng Zhenmentioning

confidence: 99%

Ultra Wideband Systems with MIMO

Kaiser¹,

Zheng²

2010

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“…• Time-reversal (TR) is another transmission technique that has gathered great interest in the past years [2][3][4][5][6][7][8][9][10][11][12][13][14][15] since it has a potential to decrease effective channel length and to enable the construction of simplified receivers. It can be seen that all of the above techniques can be interpreted as linear block precoding schemes using cyclic prefix (CP); the choice of precoder determines whether OFDM, SC, or TR (and which specific version of those methods) is used.…”

Section: Introductionmentioning

confidence: 99%

Unified Analysis of Linear Block Precoding for Distributed Antenna Systems

Koike‐Akino

Molisch

Zhang

et al. 2009

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

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Block transmission with cyclic prefix is a promising technique to realize high-speed data rates in frequency selective fading channels. Many popular linear precoding schemes, including orthogonal frequency-division multiplexing (OFDM), single-carrier (SC) block transmission, and time-reversal (TR), can be interpreted as such a block transmission. This paper presents a unified performance analysis which shows how the optimal precoding strategy depends on the receiver type and the optimization criterion (capacity and mean-square error). We analyze three variants of TR methods (based on maximum-ratio combining, equal-gain combining and selective combining) and two-types of pre-equalization methods (zero-forcing and minimum mean-square error). As one application of our framework, we derive optimal power control for OFDM in the presence of interference limitation for distributed antenna systems; we find that without power control, OFDM does not have any capacity advantage over SC transmissions. When comparing SC and TR, we find that for single-antenna systems at high SNRs, SC has a capacity advantage; however, TR performs better in the low SNR regime. For multiple-antenna systems, TR always provides higher capacity, and the capacity of TR can approach that of optimal precoders with a number of distributed antennas. Globecom 2009This work may not be copied or reproduced in whole or in part for any commercial purpose. Permission to copy in whole or in part without payment of fee is granted for nonprofit educational and research purposes provided that all such whole or partial copies include the following: a notice that such copying is by permission of Mitsubishi Electric Research Laboratories, Inc.; an acknowledgment of the authors and individual contributions to the work; and all applicable portions of the copyright notice. Copying, reproduction, or republishing for any other purpose shall require a license with payment of fee to Mitsubishi Electric Research Laboratories, Inc. All rights reserved. Abstract-Block transmission with cyclic prefix is a promising technique to realize high-speed data rates in frequency selective fading channels. Many popular linear precoding schemes, including orthogonal frequency-division multiplexing (OFDM), single-carrier (SC) block transmission, and time-reversal (TR), can be interpreted as such a block transmission. This paper presents a unified performance analysis which shows how the optimal precoding strategy depends on the receiver type and the optimization criterion (capacity and mean-square error). We analyze three variants of TR methods (based on maximum-ratio combining, equal-gain combining and selective combining) and two-types of pre-equalization methods (zero-forcing and minimum mean-square error). As one application of our framework, we derive optimal power control for OFDM in the presence of interference limitation for distributed antenna systems; we find that without power control, OFDM does not have any capacity advantage over SC transmissions. When comparing SC ...

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“…As such, the performance is limited by the interference when the transmit power is high. Another possible waveform design is ZF [77], which minimizes all the interference signal power but without taking into account the intended signal power. Thus, the resulting SNR can be very low and causes severe performance degradation especially when the transmit power is relatively low.…”

Section: A Advanced Waveform Designmentioning

confidence: 99%

Time-Reversal Wireless Paradigm for Green Internet of Things: An Overview

Chen

Han

Yang

et al. 2014

IEEE Internet Things J.

119

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Abstract-In this paper, we present an overview of the timereversal (TR) wireless paradigm for green Internet of Things (IoT). It is shown that the TR technique is a promising technique that focuses signal waves in both time and space domains. The unique asymmetric architecture significantly reduces the cost of the terminal devices, the total number of which is expected to be very large for IoT. The focusing effect of the TR technique can harvest the energy of all the multi-paths at the receiver, which improves the energy efficiency of the wireless transmission and thus the battery life of terminal devices in IoT. Facilitated by the high-resolution spatial focusing, the TR division multiple access scheme leverages the uniqueness of the multi-path profiles in the rich-scattering environment and maps them into location-specific signatures, so that spatial multiplexing can be achieved for multiple users operating on the same spectrum. In addition, the TR system can easily support heterogeneous terminal devices by providing various quality-of-service (QoS) options through adjusting the waveform and rate backoff factor. Finally, the unique location-specific signature in TR system can provide additional physical-layer security and thus can enhance the privacy and security of customers in IoT. All the advantages show that the TR technique is a promising paradigm for IoT.Index Terms-Internet of Things (IoT), spatial focusing, temporal focusing, time reversal (TR), time-reversal division multiple access (TRDMA).

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Time Reversal and Zero-Forcing Equalization for Fixed Wireless Access Channels

Cited by 35 publications

References 9 publications

Ultra Wideband Systems with MIMO

Ultra Wideband Systems with MIMO

Unified Analysis of Linear Block Precoding for Distributed Antenna Systems

Time-Reversal Wireless Paradigm for Green Internet of Things: An Overview

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