Interference Cancellation as a Mobile Enhancement to Improve Spectral Efficiency IEEE ComSoc Denver Chapter January 16, 2007

2 Introduction Privately held, wireless technology company focused solely on spectral efficiency Core competency in interference cancellation for wireless systems CDMA, WCDMA (Release 99), HSDPA, GPS, S-DMB, T-DMB Products ICAT – Interference Cancellation Analysis Tool ICT440 – HSDPA Interference Cancellation Technology ICT220 – Voice systems – CDMA1x, WCDMA (Rel99) Industry leader in interference cancellation Over 85 patents issued/filed Located in Denver, Colorado

3 Discussion Points How is Interference a Limitation of Network Performance Explanation of the impact interference has on a network How interference cancellation improves network efficiency Tools to analyze interference on a commercial network How much interference exists on 2G and 3G networks What can be done to Eliminate Interference Overview of TensorComm’s Interference Cancellation Technology (ICT™) What is the Impact of Interference Cancellation on Network Performance and Economics Capacity improvement results as measured on a CDMA commercial network Throughput gains derived from WCDMA/HSDPA commercial networks Economic benefits to the Operator as calculated from validated models

4 Interference is the Key Limiter of Code-Based Network Performance As reported by Morgan Stanley 3G Test conducted in London. Data rate increase Capacity Impact Interference causes base stations to broadcast more power to each terminal The number of terminals that can be supported simultaneously is reduced Quality of Service degradation Increase in coverage holes leads to more frequent dropped calls Data Rate reduction Degraded reception leads to lower data transfer rates For increased data rates, only users near cell center have sufficient power, thus majority of users effectively at edge of cell

5 Interference Cancellation Delivers Performance Improvements Interference is prevalent on all coded networks; which limits capacity and performance Traditional option is to add base stations or acquire more spectrum to overcome interference Historically, interference cancellation was considered too complex to implement in a mobile device Technology advancements now make it practical Operators looking for solutions to maximize spectrum efficiency TensorComm’s technology is a breakthrough innovation to address the industry’s interference problem

6 Network Analyses Conducted with WCDMA Operators TensorComm collected data from multiple commercial networks which identified a high level of interference on CDMA and WCDMA networks. More than 50% of the time a mobile device is in a condition nearing the edge of cell where performance and data rates significantly degrade.

7 ICT: Low Cost, High Performance Solution for Canceling Interference Typical Handset Architecture ICT delivers a seamless integration with existing mobile device and baseband designs, without requiring form factor changes or radio frequency (RF) redesign

8 Extensive Testing Validates ICT Gains Completed extensive simulation, lab, field & commercial testing Core technology validated on CDMA commercial networks using an integrated FPGA platform ICT provides gains of up to 6dB as observed on base station logs Provides greatest gains when and where the network needs it most

9 Fwd TCH Power (dbm) Interference Cancellation will allow Devices to Draw Less Power from the Base Station. * Measured from base station logs

10 ICT Delivers a Superior Data Experience In lab demonstrations, recorded significant decrease in the time required to transfer a data file when ICT is enabled. ICT on ICT off

11 Leaving Performance on the Table Throughput increase of over 60% readily available. bps/Hertz Increase in throughput with ICT on an HSDPA networkSINR gain with ICT on an HSDPA network

12 ICT Provides Dramatic Financial Benefits to Operators With the deployment of ICT, each cell site can handle higher volumes of voice and data traffic. ICT gain translates into a delay of infrastructure deployment, reducing CAPEX and OPEX. Makes all network capacity expenditures 60% more efficient. Example of Economic Model Output for one Mid Size CDMA Market Model developed and validated with multiple Operators Results from field test input to calculate increase in users/sector Model loaded with network stats to represent mid size market (200K users) Each sector loaded with unique traffic distribution to simulate operational network

13 The Benefits of Interference Cancellation to Wireless Operators Improves network voice capacity and data throughput Extends the life of existing deployed infrastructure Can increase Operator cash flows by significant levels: Additional spectrum expansion delayed or eliminated Each incremental ICT-enabled terminal provides a benefit to the consumer and operator. Improves network performance significantly, leading to higher satisfaction: Improves call quality and reduces dropped calls Provides superior data streaming experience Extends coverage at network edge Operators deploying Interference Cancellation will derive operational and economic benefits