1. Analyze Assure Accelerate TM MIMO (multiple-input multiple-output) with Spirent’s SR5500 Wireless Channel Emulator Rev 1.00

2. Analyze Assure Accelerate TM The information contained in this presentation is considered to be confidential and proprietary information of Spirent Communications Inc. and is subject to the terms and conditions of the Non- disclosure agreement (NDA) between the recipient(s) or recipient's organization and Spirent Communications Inc. Notice of Confidential Information

3. Analyze Assure Accelerate TM Why MIMO? MIMO answers the question of how to achieve higher data rates with longer range, backward compatibility, global regulatory compliance, all without using additional frequency spectrum. Fully compatible with today’s standards Multiplicative increase in capacity and spectral efficiency Dramatic reduction in impairments due to fading Increased system capacity Improved resistance to interference

4. Analyze Assure Accelerate TM How MIMO Works MIMO systems use multiple transmit and receive antennas. A high-rate data stream is divided into lower-rate streams, each modulated and transmitted through a different antenna, but on the same frequency. Y(t) = H(t) × S(t) ρ 11 ρ 12 … ρ1n ρ 21 ρ 22 … ρ 2n. ρ m1 ρ m2 … ρ mn H = Example: 4x4 MIMO

5. Analyze Assure Accelerate TM How MIMO Works With a single antenna, fading can be an interferer.

6. Analyze Assure Accelerate TM How MIMO Works With MIMO, fading can be used constructively to increase signal quality.

7. Analyze Assure Accelerate TM SR5500 Solution For 2× N MIMO Scalable solution 2×N MIMO requires N units (up to a maximum of 4) Each SR5500 is configured in Tx Diversity mode Only two external splitters are required

8. Analyze Assure Accelerate TM SR5500 MIMO Roadmap Currently available  2×N (N ≤ 4) MIMO using N SR5500s  Synchronized multi-unit setup (up to 4 units)  Settable correlation within a unit  Uncorrelated fading correlation across all units SR5500 v2.10 (March 2006)  Full programmable correlation between all RF channels Future  We’d like your input as to the importance of 4x4

9. Analyze Assure Accelerate TM Conclusion The SR5500 approach to MIMO is scalable, allowing the customer to add HW only as needed Fully programmable cross correlation for 2×4 will be supported in SR5500 version 2.10 (March ’06) Real-time emulation of 802.11n TGn and 3GPP MIMO channel models are under investigation We are evaluating 4x4 MIMO

10. Analyze Assure Accelerate TM All trademarks mentioned herein are the property of their respective owners Copyright © 2005 Spirent Communications Inc. Analyse |Assure |Accelerate ™