O'Reilly logo

LTE, WiMAX and WLAN Network Design, Optimization and Performance Analysis by Leonhard Korowajczuk

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 11

Radio Performance

11.1 Introduction

Network performance is ultimately defined by the radio capability to recover the original information. A radio is made of RF hardware and a signal processing hardware and software. The RF hardware has a defined SNR (Signal to Noise Ratio) to be able to extract the information from the received signal. Typical examples are a SINAD (Signal to Interference Noise And Distortion) of 12 dB for FM signals.

The signal processing hardware and software pre-process the information before transmitting it to improve the chances of recovery, by using error correction codes, interleaving and scrambling. All this results in different SNR requirements for different environments and different error rates, for each possible throughput. Due to this, radio performance has to be estimated for all possible operating conditions. In this chapter we cover how this estimation can be done. This methodology was derived from the CelPlanner software developed by CelPlan Technologies.

Basic radio performance can be defined by its Receive Sensitivity, which is the minimum input signal that results in an output with a desired signal to noise ratio and is defined by Equation (11.1).

(11.1) Receiver sensitivity 11.1) Receiver sensitivity

where:

Si = Sensitivity in Watt.

k = Boltzmann's constant (1.38 × 10−23 J/K).

Tt = Source thermal noise at input (290°K).

TRX = Equivalent noise temperature ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required