MULTIMEDIACOLLEGE JALAN GURNEY KIRI 54100 KUALA LUMPUR SIXTH SEMESTER EXAMINATION, 2013 SESSION DMWW-E-F-1-11 EGR2313 WIRELESS BROADBAND NETWORK TECHNOLOGY SHAKIRAH BINTI RAMLI INSTRUCTION TO STUDENT 10 APRIL 2013 9.00 AM 11.30 AM (2½ Jam / Hours) 1. This Examination paper has TWELVE (12) printed pages. 2. This question paper consists of TWO (2) sections. Section A : Answer ALL questions. Section B : Answer THREE (3) questions ONLY. 3. Please write all your answers in the answer booklet provided.
BAHAGIAN A : SOALAN PENDEK (40 MARKAH) SECTION A : SHORT QUESTION (40 MARKS) ARAHAN : JAWAB SEMUA SOALAN INSTRUCTION : ANSWER ALL QUESTION 1. Apakah lebar jalur tanpa wayar? / What is wireless broadband? 2. Senaraikan nilai julat frekuensi bagi ADSL, SDSL, ADSL 2+ dan VDSL. / List down is the frequency range for ADSL, SDSL, ADSL 2+ and VDSL. 3. Senaraikan DUA (2) servis umum dalam lebar jalur tanpa wayar. / List TWO (2) general services in wireless broadband. 4. Berikan DUA (2) teknologi jalur lebar. / Give TWO (2) broadband technologies. 5. Senaraikan DUA (2) kelebihan lebar jalur dari segi servis internet. / List TWO (2) benefits of broadband in term of internet services. 6. Di dalam pengurusan frekuensi, apakah ukuran bagi antenna apabila frekuensi yang tinggi digunakan? / In the frequency management, what is the measurement of the antenna when the higher frequency is used? 7. Apakah yang kamu faham mengenai Bluetooth teknologi? / What do you understand about Bluetooth technology? SR Page 2 of 12
8. Apakah tujuan utama teknologi Wi-Fi diperkenalkan? / What is the main purpose of Wi-Fi technology was introduced? 9. Berikan DUA (2) perbezaan antara teknologi Bluetooth dan Wi-Fi. / Give TWO (2) differences between Bluetooth and Wi-Fi technology. (4 Markah / Marks) 10. Apakah SOFDMA? / What is the SOFDMA? 11. Berikan fungsi IFFT (Inverse Fast Fourier Transform) dalam penghantar Wimax. / Give the function of IFFT (Inverse Fast Fourier Transform) in a WiMAX transmitter. 12. SOFDMA merupakan satu mod bagi OFDMA yang digunakan dalam Mobile Wimax. Berikan julat saluran jalurlebar tersebut. / SOFDMA is the OFDMA mode used in Mobile WiMAX. Give the range of channel bandwidth. 13. Apakah yang dinamakan penyiaran langsung satelit (DBS)? / What is direct broadcast satellite (DBS)? 14. Apakah fungsi Mobile Satellite System? / What is the function of Mobile Satellite System? 15. Apakah MIMO? / What is MIMO? SR Page 3 of 12
16. Senaraikan sistem antena yang mempunyai kepelbagaian penerima. / List the antenna systems that can employ a receive diversity. 17. Apakah teknologi perhubungan tanpa wayar yang menggunakan kod IEEE 802.11 a/b/g? / What is the technology that used IEEE 802.11 a/b/g code? 18. Apakah fungsi Spatial Multiplexing dalam sistem Multiple Input Multiple Output (MIMO) / What is function of Spatial Multiplexing (SM) in Multiple Input Multiple Output (MIMO) system? 19. Apakah Adaptive Antenna System (AAS)? / What is Adaptive Antenna System (AAS)? SR Page 4 of 12
BAHAGIAN B : SOALAN PANJANG (60 MARKAH) SECTION B : LONG QUESTION (60 MARKS) ARAHAN : JAWAB TIGA (3) SOALAN SAHAJA INSTRUCTION : ANSWER THREE (3) QUESTION ONLY Soalan / Question 1 a) Standard 802.11a telah diperkenalkan pada 2001. Senaraikan TIGA (3) ciriciri bagi standard ini. / 802.11a standard was introduces in 2001. List the THREE (3) characteristic of this technology standard. (3 Markah / Marks) b) Apakah perbezaan di antara standard 802.11b dengan 802.11g? / What is the different between 802.11b and 802.11g standard? (4 Markah / Marks) c) Wi-Fi (Wireless Fidelity) adalah istilah generik yang merujuk kepada IEEE 802.11 standard untuk komunikasi tanpa wayar Rangkaian Kawasan Tempatan (WLAN). Merujuk kenyataan di atas, bagaimana rangkaian Wi-Fi bekerja? Wi-Fi (Wireless Fidelity) is a generic term that refers to the IEEE 802.11 communication standard for wireless Local Area Networks (WLANs) Refer the above statement, how Wi-Fi networks work? (9 Markah / Marks) d) Senarai DUA (2) kekurangan dan kelebihan rangkaian Wi-Fi. / List TWO (2) the advantages and disadvantages of Wi-Fi network. (4 Markah / Marks) SR Page 5 of 12
Soalan / Question 2 a) Apakah yang dikatakan dengan teknologi satellite broadband? / What is satellite broadband technology? b) Satellite broadband menawarkan dua arah internet. Berikan nama lain yang selaras dengan satellite broadband. / Satellite broadband offers two way internets. Give the synchronous name for satellite broadband. c) Senaraikan aplikasi satellite broadband dari segi perniagaan dan akses internet. / List the application of satellite broadband in terms of business and internet access. (4 Markah / Marks) d) Satellite broadband ini memberi impak yang besar dalam teknologi komunikasi kini. Terdapat beberapa komponen utama yang berperanan dalam melaksanakan teknology ini iaitu DSL dan Broadband Internet. Senaraikan perbezaan di antara komponen tersebut dengan satellite broadband. / Satellite broadband give the big impact for nowadays communication technology. There are a few components that act as a role to implement which are DSL and Broadband Internet. List the difference between the components with satellite broadband. (6 Markah / Marks) e) Orbit satellite bumi terdiri daripada tiga jenis. Terangkan secara terperinci kesemua orbit tersebut. / Earth orbit satellite consists of three types. Describe all the type in details. (6 Markah / Marks) SR Page 6 of 12
Soalan / Question 3 a) Jelaskan perbezaan di antara kehilangan laluan dan bayangan. / Explain the difference between path loss and shadowing. (3 Markah / Marks) b) Satu penghantar menghasilkan 50W. Jika gandaan penerima yang beroperasi pada 900MHz ialah 12dBi, cari nilai kuasa penerima, Pr dalam dbm pada jarak 100m. Gunakan formula berikut: / A transmitter produces 50 W.If this is applied to a 12 dbi gain transmit antenna at 900 MHz, find the received power Pr in dbm at a distance of 100m. Use the following formula: SR Page 7 of 12
c) Pertimbangkan pengguna downlink sistem selular, di mana stesen pangkalan yang dikehendaki berada pada jarak 900 meter, dan terdapat banyak stesen berdekatan mengganggu pemancaran pada aras kuasa yang sama. Jika terdapat gangguan daripada 3 stesen pada jarak 1 km, 3 stesen pada jarak 2 km dan 10 stesen pada jarak 4 km, cari nisbah isyarat kepada gangguan (SIR) dengan menggunakan formula kehilangan empirik apabila α = 3, dan apabila α = 5. Jelaskan implikasi keputusan anda. Consider a user in the downlink of a cellular system, where the desired base station is at a distance of 900 meters, and there are numerous nearby interfering base stations transmitting at the same power level. If there are 3 interfering base stations at a distance of 1 km, 3 interfering base stations at a distance of 2 km, and 10 interfering base stations at a distance of 4 km, use the empirical path loss formula to find the signal-to-interference ratio (SIR, i.e. the noise is neglected) when α = 3, and then when α= 5. Explain the implications of your results. Empirical Path Loss Formula: (5 Markah / Marks) SR Page 8 of 12
d) Satu tapak stesen WIMAX yang berkomunikasi dengan pelanggan mempunyai saluran parameter berikut: kehilangan laluan (α) = 3.5, Po = 35dB, d 0 = 1.5m, parameter bayangan (σ s ) = 5.5dB. Andaikan kuasa penghantaran P t = 1 Watt (32 dbm), lebarjalur B = 12 MHz. Disebabkan ½ convolution codes, penerimaan SNR daripada 14.7dB diperlukan bagi 16QAM. Hanya gangguan persekitaran yang mempunyai kuasa spectral density No= -175dBm/Hz dan gangguan penerima Nf = 6dB (gangguan daripada semua sumber) dipertimbangkan. Pada jarak 500m daripada tapak stesen, apakah kebarangkalian stesen tersebut dapat menghantar menggunakan 16QAM? Diberi: Consider a WiMAX base station (BS) communicating to a subscriber, with the channel parameters: path loss (α) = 3.5, Po = 35dB, d 0 = 1.5m, shadowing parameter (σ s ) = 5.5dB. We assume a transmit power of P t = 1 Watt (32 dbm), a bandwidth of B = 12 MHz. Due to rate 1/2 convolution codes, a received SNR of 14.7 db is required for 16QAM. Finally, we consider only ambient noise with a typical power spectral density of No = 175dBm/Hz, with an additional receiver noise figure of N f = 6 db (noise from all other sources). At a distance of 500 meters from the base station, what is the likelihood that the BS can reliably send 16 QAM? Given: (10 Markah / Marks) SR Page 9 of 12
Soalan / Question 4 a) Apakah yang dikatakan OFDM? / What is OFDM? (3 Markah / Marks) b) Bagaimanakah OFDM berfungsi? / How does OFDM work? (3 Markah / Marks) c) Lakarkan gambarajah struktur simbol OFDM dalam teknologi Wimax beserta dengan fungsinya. / Illustrate OFDM symbol structure in WiMAX technology with their functions. (10 Markah / Marks) d) Senaraikan kekurangan OFDM. / List down the downsides of OFDM. (4 Markah / Marks) SR Page 10 of 12
Soalan / Question 5 a) Apakah Fixed Wireless Broadband teknologi? / What is fixed wireless broadband technology? b) Apakah EMPAT (4) sebab utama yang mendorong teknologi ini diperkenalkan? / What are the FOUR (4) of the main reasons that prompted the introduction of this technology? (8 Markah / Marks) c) Senaraikan peralatan dan senibina yang terlibat dalam Fixed Wireless Internet. / List down the equipments and setup for Fixed Wireless Internet (4 Markah / Marks) d) Apakah kekangan yang wujud dalam Fixed Wireless Broadband? / What is limitation in Fixed Wireless Broadband? (6 Markah / Marks) SR Page 11 of 12
APPENDIX ERROR FUNCTION TABLE End of Page. SR Page 12 of 12