Method and system for statistical filters and design of statistical filters

• US 7,536,282 B1
• Filed: 01/12/2007
• Issued: 05/19/2009
• Est. Priority Date: 09/01/2004
• Status: Expired due to Fees

• Current Assignee: Alereon Incorporated (PNG Telecommunications, Inc.)
• Original Assignee: Alereon Incorporated (PNG Telecommunications, Inc.)
• Inventors: Lansford, James L., Chander, Shyam Sunder Uma
• Primary Examiner(s): Feliciano, Eliseo Ramos
• Assistant Examiner(s): Huynh, Phuong
• Application Number:
  US11/653,195
• Time in Patent Office: 858 Days
• Field of Search: 702 70- 78, 702181-184, 702189-197, 37940601-40606, 379/406.08, 703/2, 703/3, 704/203
• US Class Current: 702/197
• CPC Class Codes: H03H 17/0255 Filters based on statistics adaptive filters H03H21/0029

Abstract

Systems and methods for the design or implementation of statistical filters for use in the spectral shaping of transmissions are disclosed. A desired power spectrum may be mapped to find pole locations that approximate the desired spectrum. These pole locations may then be mapped to the edge or inside of an equilateral polygon lying inside a unit circle, the equilateral polygon having the same number of sides as the order of the statistical filter desired and one vertex mapped to unity, to yield a set of eigenvalues. These eigenvalues may be the eigenvalues of a stochastic matrix the elements of which may be the Markov transition probabilities for use in a statistical filter designed to achieve the desired power spectrum. Use of a statistical filter employing these Markov transition values may be utilized to shape UWB or other signals to achieve the desired power spectrum.

Claims

1. A method for implementing a statistical filter in a radio, comprising:

mapping a power spectrum to find pole locations that approximate the power spectrum;

determining a set of eigenvalues, wherein determining the set of eigenvalues comprises mapping the pole locations to the edges of, or inside of, a polygon laying inside a unit circle, the polygon having the same number of sides as an order of the statistical filter and a vertex mapped to unity;

obtaining a stochastic matrix from the set of eigenvalues, wherein the stochastic matrix comprises a set of values;

utilizing the set of values of the stochastic matrix as transition probabilities for the statistical filter; and

forming a transmission a transmission at a first radio comprising the statistical filter.

2. The method of claim 1, wherein the transmission is formed using pulse-position modulation.

3. The method of claim 2, wherein forming the transmission comprises encoding the pulse positions of the transmission using the statistical filter.

4. A method for implementing a statistical filter in a radio, comprising:

mapping a desired power spectrum to find pole locations that approximate the power spectrum;

determining a set of eigenvalues associated with the desired power spectrum using the pole locations;

obtaining a stochastic matrix from the set of eigenvalues, wherein the stochastic matrix comprises a set of values;

utilizing the set of values of the stochastic matrix as transition probabilities for the statistical filter; and

forming a transmission using the statistical filter at a first radio comprising the statistical filter.

5. The method of claim 4, wherein the transmission is formed using pulse-position modulation.

6. The method of claim 5, wherein forming the transmission comprises encoding the pulse positions of the transmission using the statistical filter.