Skip to Main Content
Radio over Fiber for Wireless Communications: From Fundamentals to Advanced Topics
book

Radio over Fiber for Wireless Communications: From Fundamentals to Advanced Topics

by Xavier N Fernando
August 2014
Intermediate to advanced content levelIntermediate to advanced
272 pages
7h 48m
English
Wiley-IEEE Press
Content preview from Radio over Fiber for Wireless Communications: From Fundamentals to Advanced Topics

Chapter 6Subcarrier-Multiplexed ROF Uplink

In Chapter 5 the downlink of a dual-carrier Fi-Wi, transmitting both cellular radio and Wi-Fi signal, was analyzed. In this chapter the uplink performance of the same system will be analyzed.

Note that in the uplink direction, these subcarrier-multiplexed radio signals travel first over the wireless channel and then over the nonlinear ROF channel. Therefore, there are a few noteworthy points as listed below.

  • Since the RF signal experiences random fluctuation due to fading and shadowing effects in air first, the envelope of the RF signal that modulates the laser is essentially a random signal.
  • Since the WCDMA uplink transmission is asynchronous, there will be multiuser interference among WCDMA users. This multiuser interference happens before the signal goes through the nonlinear optical link.
  • Nonlinearity in the ROF link creates both co-channel interference within the same RF subcarrier and cross-talk between the RF subcarriers. These are functions of wireless channel fading as well.
  • Noise is added twice at the optical and wireless channels. The RIN is a function of total RF power over fiber.
  • The SNR and nonlinear distortion of any subcarrier is a function of total RF power in the system. Hence, the noise and nonlinearity may adversely affect the low-power RF subcarrier when the other subcarrier has significantly higher power.

The functional block diagram of the subcarrier-multiplexed uplink portion is shown in Fig. 6.1. This figure ...

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Bandwidth-Efficient Digital Modulation with Application to Deep-Space Communications

Bandwidth-Efficient Digital Modulation with Application to Deep-Space Communications

Marvin K. Simon
Optical Wireless Communications

Optical Wireless Communications

Z. Ghassemlooy, W. Popoola, S. Rajbhandari
Broadband Access: Wireline and Wireless - Alternatives for Internet Services

Broadband Access: Wireline and Wireless - Alternatives for Internet Services

Stefano Galli, Thomas Starr, Arvind Raghavan, Steven Gorshe

Publisher Resources

ISBN: 9781118797037Purchase book