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

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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