Question

Problem 1 Given the OFDMA scheme with the following constraints, iA bandwidth of 5 MHz in) The channel spacing is 15 KHz and symbol duration-ios- i) The Cyclic Prefix (CP) for each symbol is 16.67pus long iv) The Time Division Multiplexing (TDM) frame duration is 10 ms Answer the following: How many subcarriers are available? How many symbols can be fit into one TDM frame? a) b) 2. The following table illustrates the operation of an FHSS system for one complete period of the PN sequence 12 13 S68 a) What is the period of the PN sequence? b) The system makes use of a form of FSK. What form of FSK is it? c) What is the number of bits per symbol? d) What is the number of FSK frequencies? e) What is the length of a PN sequence per hop? ) Is this a slow or fast FH system? g) What is the total number of possible hops 3. The following are 8-bit orthogonal codes. 1-1-111-1 Pick any 2 rows as an 8-bit sprcading code. Prove their orthogonality ) Show the users assigned to your chosen PN sequence will not interfere with each other Prove for transmission of 0 as well as L. You have check possible interference from both