Dynamic Spectrum Management Project



Dynamic Spectrum Management (DSM) allows adaptive allocation of spectrum to various users in a multiuser environment as a function of the physical-channel demographics, to meet certain performance metrics. By contrast, static spectrum management necessarily fires spectrum allocation based upon a worst-case analysis. Many communication systems, for example DSL (Digital Subscriber Line), use static spectrum management to ensure that mutual degradation between services sharing a physical medium are within acceptable levels. Necessarily, such worst-case spectrum management reduces achievable data rates and symmetries in DSL. Our group is currently investigating the possible performance improvements that DSM can bring to multiuser environments, with particular emphasis on DSL and wireless transmission channels.

The broad area of DSM for DSL can be subdivided into the following four topics:

  1. Channel Identification Methods
  2. Spectrum Balancing
  3. Vectored Transmission Methods
  4. Multiuser Detection

For further information and our publications on these topics, please visit the corresponding pages. A seperate section on wireless area describes how these ideas fit into our ongoing research on wireless transmission. For a detailed tutorial on DSM, please see the chapter on DSM(ms word format) by Prof. Cioffi.

Our contributions to the T1E1.4 working group on DSL Transmission and IEEE 802 working group are also available in this web site. These documents explain how DSM can improve future DSL services and enumerate some of the steps necessary to enable DSL service providers and vendors to take advantage of DSM methods.
 


http://www-isl.stanford.edu/~cioffi/dsm/