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-2. 10. noise + interference. Base-station. -3. 10. Direct. Reflections. -4. 10. Execution time (in seconds). User 1. User 2. -5. 10. Single DSP implementation. 2 DSP implementation. Target data rate - 128 Kbps/user. 2 DSPs + 2 FPGAs. -6. 10. 0. 5. 10. 15. 20. 25. 30.

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Presentation Transcript
slide1

-2

10

noise + interference

Base-station

-3

10

Direct

Reflections

-4

10

Execution time (in seconds)

User 1

User 2

-5

10

Single DSP implementation

2 DSP implementation

Target data rate - 128 Kbps/user

2 DSPs + 2 FPGAs

-6

10

0

5

10

15

20

25

30

35

Users

Web pages

Come from a

Cellular phone

and

- or a -

Basestation

(Cellular tower)

Videophone calls

BER vs Path loss in dB

and are…

Then, take these algorithms (theory)…

-148

-140

-130

-120

-110

-102

…to implementation in a prototype

basestation (practice)

Scheme with RF

1.00e-1

BER

Baseband Simulation

1.00e-2

antenna

DSP + FPGA

Performs channel estimation

-148

-140

-130

-120

-110

-102

2.4 GHz ISM hardware

DSP + FPGA

DSP + FPGA

Path loss in dB

Performs RF reception

Performs detection

Performs decoding

Next Generation Cellular System

Multimedia capabilities

Multirate services

Guaranteed Quality of service

Higher Data Rates: 2 Mbps, 384 Kbps, 128 Kbps.

RENE: Wireless Cellular RadioSrikrishna Bhashyam, Sridhar Rajagopal, Kanu Chadha, Dinesh Rajan, Bryan Jones, Yuanbin Guo, Ahmad Khoshnevis, Frank Livingston, Charles Camp, Behnaam Aazhang, Joseph Cavallaro

RENE Receiver

antenna

Channel estimator

Web page

Sent via RF (radio

waves) over the air

RF receiver / demodulator

Detector

Decoder

Videophone call

Algorithm

Implementation

Theory

Practice

Channel Effects

  • Multiple Users share spectrum
    • Multiple Access Interference
  • Multipath Fading
  • Additive White Gaussian Noise

Multiprocessor Basestation Implementation

The Wireless Channel

The Sundance board contains 2 DSPs and 2 FPGAs.

Multiprocessor Simulations

The channel estimator and detector have been implemented on this platform. Measurements show a 2 DSP solution to be faster than a single DSP solution. Projects demonstrate using both DSPs and FPGAs provides even greater performance.

Larger values are worse (slower)

Modeling of RF in W-CDMA with SystemView

Output BW=InFs/N

N: 2~64 --wideband

32~65536--narrow

Decimation factor

>40MSPS

Future Work

Welkin

>40MSPS

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

Welkin

  • CompleteSystem withDSP+RF
  • Distortion TrueRF modeling (IP3,P1dB, NF…)
  • Real worldComponent Specification
  • Multi-domain Integration ( SystemView + Matlab)
  • Software Radio design with DDC/DDS