EXAMPLE : Consider an OFDM system with total bandwidth B = 1 MHz assum- ing ß=&= 0. A single-carrier system would have symbol time T, = 1/B = 1 µs. The channel has a maximum delay spread of Tm = 5 us, so with T, = 1 us and Tm 5 us there would clearly be severe ISI. Assume an OFDM system with MQAM mod- ulation applied to each subchannel. To keep the overhead small, the OFDM system uses N = 128 subcarriers to mitigate ISI. So T = NT, = 128 us. The length of the cyclic prefix is set to p = 8> T/T, to ensure no ISI between OFDM symbols. For these parameters, find the subchannel bandwidth, the total transmission time associ- ated with each OFDM symbol, the overhead of the cyclic prefix, and the data rate of the system assuming M = 16.

EXAMPLE : Consider an OFDM system with total bandwidth B = 1 MHz assum- ing ß=&= 0. A single-carrier system would have symbol time T, = 1/B = 1 µs. The channel has a maximum delay spread of Tm = 5 us, so with T, = 1 us and Tm 5 us there would clearly be severe ISI. Assume an OFDM system with MQAM mod- ulation applied to each subchannel. To keep the overhead small, the OFDM system uses N = 128 subcarriers to mitigate ISI. So T = NT, = 128 us. The length of the cyclic prefix is set to p = 8> T/T, to ensure no ISI between OFDM symbols. For these parameters, find the subchannel bandwidth, the total transmission time associ- ated with each OFDM symbol, the overhead of the cyclic prefix, and the data rate of the system assuming M = 16.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Uplink and Downlink Segment

The uplink and the downlink are the terminologies that are used in the satellite communications. The data when sent from the ground to the satellite is called the uplink and data when sent from satellite to ground is called downlink. The uplink and the downlink process goes in parallel and this is also a two way communication.

Question

EXAMPLE : Consider an OFDM system with total bandwidth B = 1 MHz assum-
ing ß=&= 0. A single-carrier system would have symbol time T, = 1/B = 1 µs.
The channel has a maximum delay spread of T = 5 us, so with T, = 1 us and Tm
5 μs there would clearly be severe ISI. Assume an OFDM system with MQAM mod-
ulation applied to each subchannel. To keep the overhead small, the OFDM system
uses N = 128 subcarriers to mitigate ISI. So T = NT, = 128 us. The length of the
cyclic prefix is set to p = 8> T/T, to ensure no ISI between OFDM symbols. For
these parameters, find the subchannel bandwidth, the total transmission time associ-
ated with each OFDM symbol, the overhead of the cyclic prefix, and the data rate of
the system assuming M = 16.

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