A Novel Approach to Successive Interference Cancellation with use of an Alternative Physical Layer
Open Access
Author:
Sietins, Alexis
Graduate Program:
Electrical Engineering
Degree:
Master of Science
Document Type:
Master Thesis
Date of Defense:
June 29, 2009
Committee Members:
Randy Young, Thesis Advisor/Co-Advisor Randy Young, Thesis Advisor/Co-Advisor
Keywords:
Spread spectrum sucessive interference cancellation SIC cdma
Abstract:
Communications drives the world. Much research is being done to advance the abilities to communicate with more people or higher data rates. Bandwidth has become the limiting factor for many communication systems. One popular solution for efficient bandwidth utilization is Direct Sequence Spread Spectrum (DSSS) which is used as the physical layer modulation underneath Code Division Multiple Accesses (CDMA).
In Direct Sequence – Code Division Multiple Access (DS-CDMA), every user acts as an interferer to every other user. This fundamental issue limits the number of users that can be placed on a single frequency band. The implementation of Power Control, causing the power of every user at the receiver to be nearly the same, increased the capacity of the channel. One newer technique being analyzed to improve DS-CDMA channel capacity is Multi-user Detection (MUD) or multi-user interference mitigation. One type of interference mitigation is Successive Interference Cancellation (SIC). Currently, SIC is not feasible to be implemented in mobile devices due to of the computation time and power consumption needed.
Scale-Time Offset Robust Modulation (STORM) is being presented in this paper as an alternative physical layer to help with synchronization for SIC on a DS-CDMA channel.
