Space Division Multiple Access for Wireless Local Area Networks

By: Patrick Vandenameele, Liesbet Van Der Perre, Marc Engels

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Hardcover | 31 July 2001

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260 Pages

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23.39 x 15.6 x 1.6

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Wireless Local Area Networks (WLANs) are experiencing a growing importance recently. Whereas WLANs were primarily used for niche applications in the past, they are now deployed as wireless extensions to computer networks. The increase of the datarates from 2 Mbps up to 11 Mbps for roughly a constant price has played a major role in this breakthrough. As a consequence, an even greater success can be envisioned for the more recent OFDM-based WLAN standards in the 5 GHz band that offer up to 54 Mbps. At IMEC we have realized this potential already several years ago and have established a successful research program on OFDM-based WLAN. The program resulted in an operational prototype of a 5 GHz OFDM system. The longer term goals of this program are to extend the indoor range of the WLAN systems up to 100 m and to increase the capacity above 100 Mbps. Driven by these goals, Patrick embarked on the usage of multiple antenna techniques and, more in particular, Space Division Multiple Access (SDMA) for WLAN as the topic for his doctoral research. During this research, key contributions were made towards making SDMA for WLAN a reality. To name a few: A basic scheme for combining OFDM and SDMA was proposed. Also realistic non-linear detection methods were developed. These me- ods achieve a high implementation efficiency, by exploiting the p- allelism of the data model and the frequency-selectivity of the pr- agation channel.

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Non-Fiction Computing & I.T.Computer Networking & Communications Engineering & Technology Energy Technology & Engineering Electrical Engineering Electronics & Communications Engineering Communications Engineering & Telecommunications Radio Technology

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Published: 17th March 2013

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List of Figures	p. ix
List of Tables	p. xiii
Preface	p. xv
Acknowledgments	p. xvii
Introduction	p. 1
The Indoor Propagation Channel	p. 9
Multipath propagation	p. 10
Time response of a multipath channel	p. 11
Frequency response of a multipath channel	p. 12
Spatial variation of the channel response	p. 13
Time variations of the channel response	p. 14
Ray tracing channel simulations	p. 15
The ray tracing algorithm	p. 16
Simulation results	p. 17
Statistical channel modeling	p. 19
Conclusions	p. 22
Array Processing Basics	p. 23
Array processing taxonomy	p. 24
System architectures for array processing	p. 24
Combining algorithms for array processing	p. 28
Building blocks for diversity combining	p. 32
Performance without diversity combining	p. 33
Single-user diversity combining	p. 34
Multi-user diversity combining	p. 38
Conclusions	p. 43
Spectrally Efficient Wlan	p. 45
Disadvantages of pico-cellular WLAN	p. 46
WLAN with intra-cell bandwidth reuse	p. 48
System architecture trade-offs	p. 49
Combining algorithm trade-offs	p. 49
The performance upper bound	p. 51
System model	p. 51
Multi-user multi-antenna MLSE	p. 52
Conclusions	p. 56
Sdma for Multi-Carrier Modulation	p. 59
Orthogonal frequency-division multiplexing	p. 60
The basic idea	p. 61
System model	p. 63
Performance	p. 65
System model for OFDM-SDMA	p. 66
Basic OFDM-SDMA algorithms	p. 68
MMSE OFDM-SDMA	p. 69
ML OFDM-SDMA	p. 73
Advanced OFDM-SDMA algorithms	p. 75
pcSIC OFDM-SDMA	p. 76
pcSIC-SI OFDM-SDMA	p. 80
Simplifying the initialization procedure	p. 86
Coherence grouping	p. 86
Calculation of the equalizer coefficients	p. 87
Downlink OFDM-SDMA algorithms	p. 94
System model for downlink OFDM-SDMA	p. 94
Downlink OFDM-SDMA by channel inversion	p. 96
Downlink OFDM-SDMA by orthogonalization	p. 99
Conclusions	p. 102
Sdma for Single-Carrier Modulation with Cyclic Prefix	p. 105
Motivation	p. 106
Peak-to-average power ratio problem	p. 107
Sensitivity to carrier frequency inaccuracies	p. 110
Frequency-domain SDMA for SC-CP	p. 111
System model for SC-CP-SDMA	p. 112
The MMSE SC-CP-SDMA algorithm	p. 114
Non-linear detection for SC-CP-SDMA	p. 116
Comparison with time-domain SDMA	p. 117
An implementation case-study	p. 121
Conclusions	p. 133
Towards a Practical Sdma System	p. 135
Channel estimation	p. 136
Multi-user channel estimation setup	p. 138
Frequency-domain channel estimation algorithm	p. 139
OFDM-SDMA with channel estimation	p. 142
Implementation options	p. 143
Synchronization	p. 148
Symbol synchronization	p. 149
Carrier frequency synchronization	p. 156
Sampling clock synchronization	p. 164
Imperfect power control	p. 168
Conclusions	p. 171
Integration of Sdma in a Mac Protocol	p. 175
The HIPERLAN II Standard	p. 176
Physical layer	p. 177
Data link control layer	p. 180
OFDM-SDMA applied to HIPERLAN II	p. 184
Spatially extended frame structure	p. 184
Synchronization	p. 188
Channel estimation	p. 193
Simulation results	p. 198
Conclusions	p. 204
Conclusions	p. 207
An SDMA solution for WLAN	p. 207
An SDMA solution for the real world	p. 208
An SDMA solution with realistic complexity	p. 209
Appendices	p. 211
Acronyms and Abbreviations	p. 211
Mathematical Notation	p. 215
Parameter Naming Conventions	p. 217
References	p. 219
Index	p. 229
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Space Division Multiple Access for Wireless Local Area Networks

At a Glance

Hardcover

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You Can Find This Book In

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