Recent work has used convex optimization to minimize the Peak-to-Average power Ratio (PAR) of OFDM signals subject to a constraint on the constellation Error Vector Magnitude (EVM). This paper extends the PAR optimization technique to Multiple-Input Multiple-Output (MIMO) OFDM systems with channel precoding. In MIMO systems with a large OFDM symbol size, it is infeasible to solve the optimization problem by direct methods such as Cholesky factorization. Instead, an iterative Conjugate-Gradient (CG) method is proposed to find an approximate solution with far lower memory and latency requirements. Future wireless standards such as 802.11n and 802.16e utilize MIMO-OFDM to increase capacity, reliability, and range.
Did you find this white paper useful?
23 out of 50 users found this white paper useful
Related white papers
Does 802.11n deliver better wireless services for Enterprises?
Watch our on demand 802.11n webinar to discover how HiPath Wireless 802.11n from Siemens Enterprise Communication has solved the traditional technology challenges associated with higher power access points and controllers....
Farpoint Group report - 802.11n Access Points and POE: Key considerations
In this 5 page report, you'll discover more about the key technical considerations when making the move to 802.11n. The report provides: * An overview of PoE ...
Practical Considerations for Deploying 802.11n
Download this White Paper from Siemens Enterprise Communications to demystify the current confusion surrounding the new 802.11n WiFi standard.Find out more about the key issues when considering a move to...
RF Over Ethernet for Wireless Infrastructure
Existing interconnects between RF and processing hardware have been tightly integrated at a system bus level or have incorporated proprietary network hardware, usually tied to the particular data being transported....
Challenges and Opportunities for Transport Providers & Mobile Operators
Although mobile backhaul transport providers have very different needs than mobile operators, their interests dovetail when it comes to efficient and optimized multiservice backhaul networks. Mobile operators are experiencing numerous...
SURPASS Carrier Ethernet: Converging an "All IP" Mobile Transport on Carrier Ethernet Networks
Mobile network operators are looking for ways to reduce OpEx while introducing new IP-based revenue-generating services. Fixed-line operators are increasingly seeking ways of converging mobile services via their transport networks....
Power Over Ethernet (PoE) and 802.11n
Power over Ethernet (PoE) technology provides a means to transmit electrical power, along with data, to remote devices such as Wireless LAN (WLAN) Access Points (APs) over an unmodified Ethernet...
