This paper describes the experimental hardware design and implementation for a delay hopped transmitted reference communication system.The hardware is designed to generate the delay hopped transmitted reference signal for a number of experimental conditions. It can be used either in ultra wideband pulse mode, ultra wideband noise mode, or in narrowband mode. We use the experimental hardware setup to conduct link experiments with a delay hopped transmitted reference communication system. Experiments were conducted in an indoor multi-path environment to test the viability of delay hopped transmitted reference for short-range indoor communications. The experimental results presented demonstrate that this modulation format is capable of transmitting data short range indoors with out line of sight transmission path with minimal transmitted RF power.
A new structure utilizing two adaptive filters in a feedback ioop has been proposed for removing noise in the presence of crosstalk.Labelled the crosstalk resistant adaptive noise canceller (CTRANC), it has been implemented on two boards built around a TMS32O1O and a 8031 processor. These two processors form the main elements of a hardware test work station. Tests have been conducted in a hard walled room with speech and noise sources.With non-optimized parameters, output signal-to-noise ratios exceeded those at the input by 9 to 11 dB. Improvements over the standard adaptive noise canceller ranged from 4 to 11 dB. DRT conducted for speech recorded in a background of helicopter noise and processed through the filter showed an improvement of 21.4 points over that obtained for unprocessed speech.
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