US 7,924,953 B2 · Apparatus and method for detecting time-frequency code in MB-OFDM UWB system

Abstract

Provided is an apparatus and method for detecting a time-frequency code in an MB-OFDM UWB system. The apparatus includes a controller for providing a band selection signal to the RF receiver and outputting a preamble selection signal at regular symbol periods to calculate a cross correlation value for a predetermined time period more than a beacon frame interval when a time-frequency code search start signal is received; and a cross correlator for storing information on preamble patterns, selecting a preamble stored depending on the preamble selection signal, and calculating a cross correlation value for a digital signal transferred through the RF receiver, wherein the controller determines a time-frequency code using a preamble where a peak occurs as a time-frequency code that is currently in use when a peak signal is inputted based on the calculated cross correlation value, and transmits the determined time-frequency code to the MAC receiver.

Claims11

Dependent claims

An apparatus for detecting a time-frequency code in a Multi-Band Orthogonal Frequency Division Multiplexing Ultra Wideband (MB-OFDM UWB) receiving apparatus having a Radio Frequency (RF) receiver, a modem and a Media Access Control (MAC) receiver, the apparatus comprising:

a controller for providing a band selection signal to the RF receiver and outputting a preamble selection signal at regular symbol periods to calculate a cross correlation value for a predetermined time period more than a beacon frame interval when a time-frequency code search start signal is received from the MAC receiver;
and
a cross correlation means for storing information on preamble patterns, selecting a preamble stored depending on the preamble selection signal from the controller, and calculating a cross correlation value for a digital signal transferred through the RF receiver,
wherein the controller determines a time-frequency code using a preamble where a peak occurs as a time-frequency code that is currently in use when a peak signal is inputted based on the calculated cross correlation value from the cross correlation means, and transmits the determined time-frequency code to the MAC receiver.

1 more element

A method for detecting a time-frequency code in a Multi-Band Orthogonal Frequency Division Multiplexing Ultra Wideband (MB-OFDM UWB) receiving apparatus having a Radio Frequency (RF) receiver, a modem and a Media Access Control (MAC) receiver, comprising the steps of:

a) at the modem, receiving a time-frequency code search start signal from the MAC receiver;
b) at the modem, selecting a subband depending on a band selection signal and calculating a cross correlation value for an input signal for a predetermined time period more than a beacon frame interval while changing a preamble selection signal;
c) at the modem, if a peak is detected based on the cross correlation value calculated in the step b), searching a preamble where the peak occurs;
d) at the modem, if a preamble where the peak occurs is searched in the step c), determining a time-frequency code using a preamble where the peak occurs as a time-frequency code that is currently in use;
e) at the modem, repeatedly performing the steps b) to d) for all preambles;
and
f) at the modem, transferring a determined time-frequency code to the MAC receiver.

4 more elements

Dependencies are inferred from the claim text.

Apparatus and method for detecting time-frequency code in MB-OFDM UWB system

Life of this patent

Apparatus and method for detecting time-frequency code in MB-OFDM UWB system

Life of this patent

Abstract

Claims11