Patent ID: 8583067
Filing Date: 2013-11-12
Classification: H04B,H04L

Abstract:
1. A system comprising: a wireless sensor configured to measure one or more characteristics associated with an industrial process; and a wireless node configured to receive wireless signals containing sensor measurements from the wireless sensor, the wireless node comprising a diversity receiver configured to process the wireless signals from the wireless sensor; wherein the diversity receiver comprises multiple channels, each channel comprising: wherein the diversity receiver further comprises: wherein the intermediate frequency-to-baseband converter in each channel is configured to store samples of its intermediate frequency signal in a first buffer, store products of the samples and cosine values in a second buffer, store products of the samples and sine values in a third buffer, store filtered products from the second buffer in a fourth buffer, and store filtered products from the third buffer in a fifth buffer; wherein the demodulator comprises (i) a limiter configured to store normalized complex values generated using the filtered products from the fourth and fifth buffers in a sixth buffer and (ii) a discriminator configured to store values generated using products of the normalized complex values and their delayed complex conjugates in a seventh buffer; and wherein the time synchronizer is configured to square the values from the seventh buffer, store the squared values in an eighth buffer, sum all same-indexed squared values from the eighth buffer to generate multiple sums that are stored in a ninth buffer, identify an index of a largest sum in the ninth buffer, and store samples of the demodulated baseband signal having the identified index in a tenth buffer.