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Method for the detection of communication signals under the combined constraints of signal-power and channel-spread delay

IP.com Disclosure Number: IPCOM000124313D
Publication Date: 2005-Apr-15
Document File: 3 page(s) / 20K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for the detection of communication signals under the combined constraints of signal-power and channel delay-spread. Benefits include improved functionality and improved performance of the acquisition system.

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Method for the detection of communication signals under the combined constraints of signal-power and channel-spread delay

Disclosed is a method for the detection of communication signals under the combined constraints of signal-power and channel delay-spread. Benefits include improved functionality and improved performance of the acquisition system.

General description

              The disclosed method provides an efficient algorithm for detecting communication signals that are corrupted by a fading channel and noise. The algorithm is applied to the output of the correlator in the acquisition part of the receiver. This correlator typically performs the cross-correlation between the received signal and the preamble that is attached to the transmitted data. A common structure of the cross-correlation result is multiple peaks due to channel fading and noise. The disclosed method provides efficient detection with low rates of false alarms and misdetections by successful analysis of the cross-correlation results.

Advantages

              The disclosed method provides advantages, including:
•             Improved functionality due to detecting communication signals that are corrupted by a fading channel and additive noise
•             Improved performance due to minimizing the effect of noise and signal fading

Detailed description

              The disclosed method includes an algorithm that distinguishes between noise (or undesirable interferers) and a legal signal that might be corrupted by fading. This distinction is made by calculating the intensity and spread of the peaks at the correlation result. The destructive effect of fading is overcome by collecting contributions from all peaks rather from a single one. The algorithm accepts or rejects the signal according to a look-up table. It contains the conditions of all legal signals, considering the peaks intensities and the peaks averaged intensity (see Figure 1).

              The algorithm utilizes the following facts:

•             The intensity of the peaks indicates the power of the detected signal.

•             The...