Spectrum Shaping Using Code-Hopping CDMA

Abstract

Spectral shaping is one of the primary technical challenges in spectrally constrained multiple access applications. In this paper, we introduce an efficient orthogonal CDMA-based spectral shaping technique. In our approach, termed Code- Hopping CDMA, users are allowed to hop between available spreading codes in an orthogonal fashion with different frequencies. We show that code hoping patterns can be chosensuch that the power spectral density of the resulting signal would approximate a predetermined desired shape. We will demonstrate our approach through two examples and analyze the impact of the hopping pattern on the system capacity.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Oct 30, 2005
Accession Number
AD1126179

Entities

People

  • Ali Saidi

Organizations

  • MITRE Corporation

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Bandwidth
  • Code Division Multiple Access
  • Communication Systems
  • Digital Communications
  • Digital Filters
  • Frequency
  • Frequency Division Multiple Access
  • Frequency Division Multiplexing
  • Modulation
  • Multiple Access
  • Multiplexing
  • New York
  • Orthogonal Frequency Division Multiplexing
  • Power Spectra
  • Probability
  • Radio Interference
  • Random Variables
  • Sequences
  • Signal Processing
  • Spectra
  • Task Forces
  • Time Division Multiple Access
  • Wireless Communications

Fields of Study

  • Engineering

Readers

  • Computer Vision.
  • Radio communications and signal processing.