TELECOMMUNICATIONS PROJE C T The Wimax – 802.16e presentation

1. TELECOMMUNICATIONS PROJECT The Wimax – 802.16e presentation Team : PAPASTEPHANAKIS Stéphane ALLAIN Yohann Supervisor : Mr BESTAK 11/07/2006 ISEP–Telecommunications Project– July 2006

2. The WiMax – TELECOMMUNICATIONS PROJECT WiMax abstract • Working schedule • WiMax overview • Conclusion ISEP–Telecommunications Project– July 2006

3. WiMax : Wireless Microwave Access acronym Promise to deliver high data rates over large areas to a large number of users Provide broadband access to locations in the world’s rural and developing areas where broadband is currently unavailable WiMax’s competitiveness in the marketplace largely depends on the actual data rates and ranges that are achieved The WiMax – TELECOMMUNICATIONS PROJECT ISEP–Telecommunications Project– July 2006

4. The WiMax – TELECOMMUNICATIONS PROJECT Working Schedule Work organised in 4 steps: • Research for references • Reference analysis • Internship report • Powerpoint preparation Working organisation June the 19th: we choose the WiMax topic June the 23rd: the references research was finished, June the 26th: beginning of the reference analysis July the 3rd: starting of the internship report July the 8th: starting of the powerpoint presentation July the 11th: oral presentation ISEP–Telecommunications Project– July 2006

5. The WiMax – TELECOMMUNICATIONS PROJECT WiMax overview Initial interest was in the 10–66 GHz range, but more recent interest is behind the 2–11 GHz for Non Line Of Sight (NLOS) operation mode 2 frequency ranges licensed (2.5–2.69 and 3.4–3.6 GHz) unlicensed spectrum (5.725-5.850 Ghz) IEEE 802.16e supports mobility up to speeds of 120-130 km/h and an asymmetrical link structure that enable the Subscriber Station (SS) to have a handheld form factor for PDAs, phones, or laptops. ISEP–Telecommunications Project– July 2006

6. The WiMax – TELECOMMUNICATIONS PROJECT WiMax overview I Physical layer overview : 3 interfaces Wireless MAN-SCa: A single-carrier modulated air interface. Wireless MAN-OFDM: A 256-carrier Orthogonal-Frequency Division Multiplexing (OFDM) scheme. Multiple access of different Subscriber Stations (SS) is Time-Division Multiple Access (TDMA)-based. Wireless MAN-OFDMA: A 2048-carrier OFDM scheme. Multiple access is provided by assigning a subset called sub channel of the carriers to an individual receiver, so this version is often referred to as OFD Multiple access (OFDMA). the two OFDM based systems are more suitable for non-LOS operation due to the simplicity of the equalization process for multicarrier signals ISEP–Telecommunications Project– July 2006

7. The WiMax – TELECOMMUNICATIONS PROJECT WiMax overview The transmitted sequence {bn} is obtained from the input information sequence {an} through an N-point Inverse Digital Fourier Transform (IDFT). The {an} is created from the source data passed through a Forward Error Correction (FEC) encoder, then interleaved and mapped into a constellation that can be Quaternary Phase Shift Keying (QPSK), 16-Quadrature Amplitude Modulation (QAM), or 64-QAM. The IDFT converter receives and presents the information in blocks of N samples. The resulting waveform is a sum of sinewaves separated in frequency at 1/NT, modulated by an and filtered in baseband with f(t), the anti-aliasing filter. The quadrature modulator shifts the frequency to the carrier frequency f0. ISEP–Telecommunications Project– July 2006

8. The WiMax – TELECOMMUNICATIONS PROJECT Conclusion • First time we work on a telecomunications project • Difficulty to understand some keen technical topics • The project was well managed • We learned new technical aspects • in the telecomunication domain ISEP–Telecommunications Project– July 2006

9. The team: Stéphane Papastephanakis Yohann Allain ISEP–Telecommunications Project– July 2006