| Wireless Networks Contributor(s): Usman, Mohammad (Author) |
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ISBN: 3639172671 ISBN-13: 9783639172676 Publisher: VDM Verlag OUR PRICE: $60.53 Product Type: Paperback Published: May 2010 |
| Additional Information |
| BISAC Categories: - Computers | Networking - General |
| Physical Information: 0.34" H x 6" W x 9" (0.49 lbs) 144 pages |
| Descriptions, Reviews, Etc. |
| Publisher Description: In this thesis we study the effect of interference and methods of coping with it in a wireless network. We approach the problem from three different perspectives. The first which involves physical layer is a method to cancel out interference in a multi-access channel. We consider J transmitter units each equipped with N transmit antennas over wireless Rayleigh fading channels. Previously, it was proved that when each transmitter unit has N transmit antennas, using (J - 1)N + r receive antennas for any r >= 1, the receiver can completely separate the signals of J users. The provided diversity to each user was shown to be N r if the units employ space-time trellis codes even if the units transmit asynchronously. Here, we consider the case when all units are synchronized and employ Quasi-Orthogonal Space-Time Block Codes (N > 2). It is proved that in this case a receiver with xvi J + r - 1 antennas, with r >= 1, can separate the transmitted signals of all units and provide each unit with a diversity order of N r. |