Modeling of RF in W-CDMA with SystemView RENE: Wireless Cellular Radio Srikrishna Bhashyam, Sridhar Rajagopal, Kanu Chadha, Dinesh Rajan, Bryan Jones, Yuanbin Guo, Ahmad Khoshnevis, Frank Livingston, Charles Camp, Behnaam Aazhang, Joseph Cavallaro Base-station Receiver Coding vs Spreading in W-CDMA Next Generation Cellular System Multimedia capabilities Multirate services Guaranteed Quality of service Higher Data Rates: 2 Mbps, 384 Kbps, 128 Kbps. Coding error correction capability Spreading interference cancellation. Both cause bandwidth expansion. Given fixed information rate and transmission bandwidth Find ‘optimum’ trade-off between Spreading and Coding Channel Estimator Multiuser Detector Demux Decoder Data Pilot Estimated Amplitudes & Delays Demodulator Antenna Channel Effects Multiple Users share spectrum Multiple Access Interference Multipath Fading Additive White Gaussian Noise Multiprocessor Implementation Rapid Prototyping using Simulink The Wireless Channel 5 10 15 20 25 30 35 -6 -5 -4 -3 -2 Execution time (in seconds) Users Single DSP implementation 2 DSP implementation Target data rate - 128 Kbps/user 2 DSPs + 2 FPGAs Joint estimation and detection runs on DSP, while data generation, analysis runs on host! Direct Reflections noise + interference User 1 User 2 Base-station Accelerating the blocks in Multistage Detection to meet real-time requirements. Future Work Modeling of RF in W-CDMA with SystemView Complete system evaluation on multiple DSPs and RF hardware Carrier offset and synchronization - multiple users Mobile handset - low power, fixed point DSP implementation Integrating physical layer with higher layers Task partitioning and Parallel architectures for acceleration NCO AFC N Decimation factor Welkin >40MSPS ADC: AD6640 1.Off-shelf Chips(GC1012,AD6620) 2. FPGA Output BW=InFs/N N: 2~64 --wideband 32~65536--narrow Complete System with DSP+RF Distortion True RF modeling (IP3,P1dB, NF…) Real world Component Specification Multi-domain Integration ( SystemView + Matlab) Software Radio design with DDC/DDS ECE Industrial Affiliates, Rice University 1999