Lawrence Larson

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Pseudochaotic time hopping (PCTH) is a recently proposed encoding/modulation scheme for ultra-wideband (UWB) impulse radio. PCTH exploits concepts from symbolic dynamics to generate aperiodic spreading sequences, resulting in a noise-like spectrum. In this paper, we present a multiple-access technique suitable for the PCTH scheme. In particular, we provide(More)
In this paper we present a new type of head-mounted wireless neural recording device in a highly compact package, dedicated for untethered laboratory animal research and designed for future mobile human clinical use. The device, which takes its input from an array of intracortical microelectrode arrays (MEA) has ninety-seven broadband parallel neural(More)
Brain recordings in large animal models and humans typically rely on a tethered connection, which has restricted the spectrum of accessible experimental and clinical applications. To overcome this limitation, we have engineered a compact, lightweight, high data rate wireless neurosensor capable of recording the full spectrum of electrophysiological signals(More)
Interleaved convolutional time hopping (ICTH) is a recently proposed coding/modulation scheme for UWB impulse radio. ICTH is based upon a low-rate convolutional code, with optimized distance properties, combined with multilevel pulseposition modulation (PPM). In this context, bit-interleaved coded modulation (BICM) is used to decorrelate the bit errors and,(More)
General techniques to improve the microwave performance of plastic leaded packages have been developed. These techniques result in an Improvement of the bandwidth and reduction of losses in the structure. The techniques were applied to an SSOP8 configuration, and the useful frequency range was extended from 6 GHz to well above 10 GHz.
Multiple antenna approaches for wireless systems have been used for many years. By utilizing the complex diversity properties of the channel, they can mitigate the effects of fading and dramatically improve receiver performance in the presence of multipath [1]. Unfortunately, these techniques can also dramatically raise the cost and DC power consumption of(More)
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