Digital Transceiver Implementation Characterization Presentation Barak Shaashua Barak Straussman Supervisor: Idan Shmuel

Project Goals Implementation of transceiver with Labview on FPGA. Project parts: 16 QAM Tranceiver 8 PSK Tranceiver

Constellation Mapping Transmitter Block Diagram I Source Coder Channel Coder  Serial / Parallel  Constellation Mapping Q DAC LPF I כמה אפשרויות: DAC לפני ה – combine, או אחרי... + π/2 ISI Filter Up Converter Combiner Q Sin(wt) DAC LPF

Receiver Block-Diagram LPF I + π/2 Timing & Carrier Recovery RF ADC Sin(wt) Q LPF I Channel Decoder Symbol Decision Constellation Mapping Parallel / Serial Q (+ Source)

Project Environment Software LabView 2010 v.10 (FPGA, RF toolbox) Tabor – ArbConnection Hardware FPGA – Virtex5, NI FlexRio Board NI 5761 Digitizer Tabor – wx2182 Scope, Spectrum Analyzer Combiner – 5M – 2500M NI 5761 Digitizer – 14-Bit, 250 MS/s, 500Mhz BW Tabor – wx2182, 2.1GS/s, 16Mb waveform memory, 1Ghz (sin) , 12 digits resolution.

Hardware Connection

Rates FPGA – 400Mb/s Tabor – 2.1GS/s, 16MB waveform memory Digitizer – 250MS/s GPIB – 1.5MB/s LAN – Fast Ethernet 100Mb/s Coaxial cable – BW 4.2Ghz Our IF frequency: 100Mhz Tabor Symbol Rate possible: 100Khz – 500Mhz

Time Table 1.2 – 28.2 8.1 – 31.1 25.12 – 7.1 4.12 – 24.12 27.11– 3.12 3.11 – 26.11 Studying project material & work environment Transmitter Block Design Receiver Block Design FPGA Simulation & debugging Tests

Channel Coder Block Code – as Hamming Code: Implementation with vectors and matrices representation Able to detect up to 2 errors and correct one

ISI Symbol interference results of dispersion in transmission medium ISI filter decreases this interference Filter: Root Raised Cosine

Constellation Mapping Implementation with Lock Up Table Symbols - according to Gray Code One LUT for 16QAM, another for PSK

Timing & Carrier Recovery Recovers 3 elements: Symbol Timing – Grander Algorithm Carrier Frequency Carrier Phase Makes use of Digital PLL

Symbol Decision Noise Sources: Channel, Quantization, Aliasing… Assumptions: Noise is AWGN, orthogonal & i.i.d Uniform symbol probability Symbols decision according to Euclidian distance only. רעש יכול לנבוע למשל מה-ADC – רעש קוונטיזציה, רעש מקיפולים..