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Technology Stocks : 4G - Wireless Beyond Third Generation -- Ignore unavailable to you. Want to Upgrade?

To: slacker711 who wrote (525)	11/1/2005 8:59:26 PM
From: Dexter Lives On	Read Replies (3) \| Respond to of 1002

4G to be specified / standardized by December 2006 grouper.ieee.org grouper.ieee.org Title QFDD and QTDD: Technology Overview Date Submitted 2005-10-28 Source(s) Jim Tomcik Qualcomm, Incorporated .... In this paper, we describe a complete and compliant technical proposal for a Mobile Broadband Wireless Access (MBWA) system that meets the requirements for the future IEEE 802.20 standard. Both TDD and FDD technologies are included in this document, since there is much in common between the two approaches. We describe the physical layer (PHY) and medium access control (MAC) protocols that are part of the proposed specification. The physical layer uses nonorthogonal and orthogonal multiple access schemes and supports deployment bandwidths from 5 MHz to 20 MHz. The technologies are optimized for high spectral efficiency and mobile operation in a wide area deployment. To improve capacity and coverage, the system employs advanced techniques such as multiple input multiple output (MIMO) transmission, fractional frequency reuse (FFR), precoding, and spatial division multiple access (SDMA). The MAC protocols are designed to provide multiple quality of service (QoS) levels and provide optimized user experience in a mobile environment. This paper provides details of how these features are incorporated in the system design. .... The features of the physical layer are described in Sections 6 through 26. The physical layer uses a combination of orthogonal frequency division multiple access (OFDMA) for the data channels and code division multiple access (CDMA) for some of the reverse link control channels. The system can be deployed in flexible bandwidths from 5 MHz to 20 MHz. With multi-input multi-output (MIMO) transmission, peak data rates over 260 Mbps are supported in 20 MHz bandwidth. The system supports both frequency division duplex (FDD) and time division duplex (TDD) modes of operation. The TDD mode provides flexible allocation of resources between forward and reverse links. .... While the system uses orthogonal multiple access on the reverse link data channel, the capacity of such schemes does not scale linearly with the number of receive antennas at the access point. To overcome this issue, the system has a quasi-orthogonal reverse link that is described in Section 17. While the system is designed to operate with universal frequency reuse, it can also employ fractional frequency reuse (FFR) which is an interference management technique that provides better user experience at cell boundaries. 4G is coming a lot sooner than the pundits would have you believe.... Note the spectral efficiency of 13 [ my lucky number ;) ] in the quoted wideband performance!!?! Message 21740480 ynucc.yeungnam.ac.kr ynucc.yeungnam.ac.kr Take it ez. OFDM is Cool