| Publisher | Indian Institute of Technology Madras | ||
|---|---|---|---|
| Format | 89.6KB PDF | Date added | 11 Apr 2007 |
| Topics | Wireless LAN, Mobile - Wireless Communications | ||
| Downloads | 12 | ||
Adaptive modulation can be used in conjunction with Orthogonal Frequency Division Multiplexing (OFDM) to obtain high spectral efficiencies. This paper analyzes two types of adaptive OFDM systems with quantized feedback. In the first type, rate and power allocation algorithm is performed at the transmitter to maximize throughput using quantized Channel-to-Noise Ratio (CNR) feedback from the receiver. In the second type, power allocation is implicit such that the receiver decides the constellation to be used in each subcarrier and sends back only the rate allocation vector to the transmitter. The paper determines the spectral efficiency of these adaptive OFDM systems and quantifies the number of bits of feedback needed in each case.
Did you find this white paper useful?
24 out of 50 users found this white paper useful
Related white papers
Intel Case Study: Strix Systems Access/One Network
The difference between a Strix Systems Access/One Network and a typical enterprise network is simple: wires or, no wires. Going where only wired solutions have gone before, Strix Systems designed...
How to Protect your Critical Information Easily
Safeguarding massive amounts of sensitive, confidential data—from legally protected personal information to intellectual property and trade secrets—from malicious attacks and accidental loss is one of IT's biggest challenges. With employees...
Adapting to the Wireless Environment With 802.11k
This webcast will explain what is 802.11k and why is it needed, 802.11k and the wireless environment, radio resource measurement and control and how 802.11k will impact IT Adaptive algorithms....
Cisco Wireless Solution Helps Florida Hospital Enhance Patient Care
Florida Hospital administrators wanted to link more than 90 facilities within the vast Florida Hospital system to increase the patient care capability of caregivers, make network management faster and easier,...
Colubris Networks Case Study: Connexion by Boeing
Connexion by Boeing is globally recognized as the industry's first and foremost provider of secure, high-speed in-flight Internet access for commercial and executive aircraft operators. In creating the Connexion by...
Conducting a WLAN Site Survey and Implementation for the Cisco® Unified Wireless Network
When preparing to conduct a site survey for a Cisco® wireless LAN (WLAN) installation, follow the Cisco network design methodology: Prepare, Plan, Design, Implement, Operate, and Optimize (PPDIOO). PPDIOO addresses...
SyncScan: Practical Fast Handoff for 802.11 Infrastructure Networks
This paper describes SyncScan, a low-cost technique for continuously tracking nearby base stations by synchronizing short listening periods at the client with periodic transmissions from each base station. The paper...
