Code error detecting device, wireless system and code error detecting method
First Claim
1. A code error detecting apparatus comprising:
- a receiving terminal that receives a first pulse signal sequence subjected to on-off keying modulation and a second pulse signal sequence inverting a code of the first pulse signal sequence;
a pulse detecting section that outputs first and second detected data based on the first pulse signal sequence and the second pulse signal sequence received at the receiving terminal;
a code comparing section that compares codes of the first and second detected data output from the pulse detecting section;
an error detecting section that detects errors of the codes based on comparison results in the code comparing section;
a delay profile acquiring section that acquires a delay profile of a delay estimating symbol received at the receiving terminal;
a correlation section that carries out a correlation operation of the delay profile and a code of past decoded data to acquire a first correlation value and carries out a correlation operation of the delay profile and an inverted code of the past decoded data to acquire a second correlation value; and
a deciding section that, when a code error is detected in the error detecting section, determines a code of decoded data in which the code error is detected, according to a comparison result of the first and second correlation values.
2 Assignments
0 Petitions
Accused Products
Abstract
A code error detecting device that can more precisely detect a code error due to a delayed wave is disclosed. The code error detecting device includes a receiving antenna (121) for receiving a on-off keying modulated pulse and its code-reversed pulse, a pulse detector (124) for outputting detected data in accordance with the pulses, a code comparing unit (128) for comparing each code of first received data (R1) with one of second received data (R2), wherein the first and second received data are derived from the output detected data, and an error detecting unit (129) for detecting an error of each code from a comparison result (D2) indicative of a result compared in the code comparing unit (128).
14 Citations
9 Claims
-
1. A code error detecting apparatus comprising:
-
a receiving terminal that receives a first pulse signal sequence subjected to on-off keying modulation and a second pulse signal sequence inverting a code of the first pulse signal sequence; a pulse detecting section that outputs first and second detected data based on the first pulse signal sequence and the second pulse signal sequence received at the receiving terminal; a code comparing section that compares codes of the first and second detected data output from the pulse detecting section; an error detecting section that detects errors of the codes based on comparison results in the code comparing section; a delay profile acquiring section that acquires a delay profile of a delay estimating symbol received at the receiving terminal; a correlation section that carries out a correlation operation of the delay profile and a code of past decoded data to acquire a first correlation value and carries out a correlation operation of the delay profile and an inverted code of the past decoded data to acquire a second correlation value; and a deciding section that, when a code error is detected in the error detecting section, determines a code of decoded data in which the code error is detected, according to a comparison result of the first and second correlation values. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A radio system comprising:
-
a receiving apparatus that builds in a code error detecting apparatus; and a transmitting apparatus that carries out on-off keying modulation of a pulse signal sequence transmitted to the receiving apparatus and transmits the pulse signal sequence, wherein the code error detecting apparatus comprises; a receiving terminal that receives a first pulse signal sequence subjected to on-off keying modulation and a second pulse signal sequence inverting a code of the first pulse signal sequence; a pulse detecting section that outputs first and second detected data based on the first pulse signal sequence and the second pulse signal sequence received at the receiving terminal; a code comparing section that compares codes of the first and second detected data output from the pulse detecting section; an error detecting section that detects errors of the codes based on comparison results in the code comparing section; a delay profile acquiring section that acquires a delay profile of a delay estimating symbol received at the receiving terminal; a correlation section that carries out a correlation operation of the delay profile and a code of past decoded data to acquire a first correlation value and carries out a correlation operation of the delay profile and an inverted code of the past decoded data to acquire a second correlation value; and a deciding section that, when a code error is detected in the error detecting section, determines a code of decoded data in which the code error is detected, according to a comparison result of the first and second correlation values.
-
-
8. A code error detecting method comprising:
-
receiving, by a receiving terminal, a first pulse signal sequence subjected to on-off keying modulation and a second pulse signal sequence inverting a code of the first pulse signal sequence; outputting first and second detected data based on the received first pulse signal sequence and second pulse signal sequence; comparing codes of the first and second detected data; detecting errors of the codes based on comparison results; acquiring a delay profile of a delay estimating symbol received at the receiving terminal; carrying out a correlation operation of the delay profile and a code of past decoded data to acquire a first correlation value and carrying out a correlation operation of the delay profile and an inverted code of the past decoded data to acquire a second correlation value; and determining, when a code error is detected, a code of decoded data in which the code error is detected, according to a comparison result of the first and second correlation values. - View Dependent Claims (9)
-
Specification