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Quick Bit Error Rate Estimator for Infrared Data Association

IP.com Disclosure Number: IPCOM000118297D
Original Publication Date: 1996-Dec-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 4 page(s) / 72K

Publishing Venue

IBM

Related People

Kanada, Y: AUTHOR [+3]

Abstract

Disclosed is a system that allows for the estimation of the Bit Error Rate (BER) for an infrared data communication link in a short time. In this article, it is assumed that the link is in conformity with the standard of the Infrared Data Association (IrDA).

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Quick Bit Error Rate Estimator for Infrared Data Association

      Disclosed is a system that allows for the estimation of the Bit
Error Rate (BER) for an infrared data communication link in a short
time.  In this article, it is assumed that the link is in conformity
with the standard of the Infrared Data Association (IrDA).

      Fig. 1 shows the configurations of this system.  It consists of
a transmitter and a receiver.

      In the transmitter, a CPU generates a test sequence and it is
serialized by a UART.  The test sequence is modulated to
Return-to-Zero, RZ, signals by modulator.  A "0" is converted into a
pulse and "0" is converted into no pulse.  The pulse duration of the
RZ signals is 3/16  of a bit duration.  The signals are transmitted
with infrared signals.

      In the receiver, the received signals are filtered by a Low
Pass Filter (LPF).  An example of the filtered signals is shown in
Fig. 2.  The time constant of the LPF has to be defined in accordance
with the bit rate.  In this figure, the time constant is 5 uS and the
bit rate is 9600 bps.  The filtered signals are demodulated to a data
sequence.  The pulse detection timing is 2/16 of bit duration later
from the beginning of every bit slot, and the threshold is assumed to
be the center between high and low peak level.  The data sequence is
deserialized by a UART and passed to a CPU.

      In the proposed system, clocks in the transmitter and the
receiver have differen...