Question 2 (8 marks total) (a) Two stations are connected by a communication lin
ID: 3752361 • Letter: Q
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Question 2 (8 marks total) (a) Two stations are connected by a communication link with a data rate of 1 Mbps, probability of bit error of 10*, and one-way propagation delay of 0.5 ms. A 1,000,000 bytes file is to be sent from one station to another in 1000 equal-sized packets. Using Selective Repeat ARQ, determine the total average time required to transmit the whole file. Assume the processing time, number of overhead bits and transmission time for ACKs are negligible. (5 marks) (b) Briefly explain the concept of code division multiple access (3 marks)Explanation / Answer
CDMA
Stands for "Code Division Multiple Access." CDMA is a remote transmission innovation that was produced amid World War II by the English partners to abstain from having their transmissions stuck. After the war finished, Qualcomm licensed the innovation and made it monetarily accessible as an advanced cell innovation. Presently CDMA is a mainstream specialized strategy utilized by numerous mobile phone organizations.
Not at all like the GSM and TDMA advancements, CDMA transmits over the whole recurrence run accessible. It doesn't allocate a particular recurrence to every client on the interchanges organize. This strategy, called multiplexing, is the thing that made the transmissions hard to stick amid World War II. Since CDMA does not restrict every client's recurrence extend, there is more data transmission accessible. This enables more clients to convey on a similar system at one time than if every client was dispensed a particular recurrence extend.
Since CDMA is an advanced innovation, simple sound signs must be digitized before being transmitted on the system. CDMA is utilized by 2G and 3G remote interchanges and regularly works in the recurrence scope of 800 MHz to 1.9 GHz.
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