公开(公告)号：US20170099063A1

公开(公告)日：2017-04-06

申请号：US15266458

申请日：2016-09-15

Applicant: Marvell World Trade Ltd.

Inventor： Vijay Ganwani ,  Vijay Ahirwar ,  Yui Lin ,  Sudhir Srinivasa ,  Hongyuan Zhang ,  Sridhar Narravula

IPC: H03M3/00 ,  H04L27/26 ,  H04B1/10 ,  H04L7/033

CPC classification number: H03M3/378 ,  H03M1/1085 ,  H03M1/1095 ,  H03M3/356 ,  H04B1/1036 ,  H04B2001/1063 ,  H04L7/0331 ,  H04L27/2636

Abstract: Apparatus for determining a signal-to-quantization-noise ratio of a quantization circuit includes a signal generator that generates an input test signal for input to the quantization circuit, circuitry for isolating, from output of the quantization circuit, a signal representing quantization noise, and circuitry for determining a ratio of the output of the quantization circuit to the signal representing quantization noise. The signal generator generates an analog test tone having a frequency, and the circuitry for isolating includes a notch filter filtering that frequency. Alternatively, the circuitry for isolating includes circuitry for generating a digital test signal, and a digital subtractor for subtracting the digital test signal from the output of the quantization circuit. According to another alternative, the circuitry for isolating includes a transformation circuit whose outputs represent a peak of the output of the quantization circuit and a noise floor of the output of the quantization circuit.

公开(公告)号：US10938512B2

公开(公告)日：2021-03-02

申请号：US16359968

申请日：2019-03-20

Applicant: Marvell World Trade Ltd.

Inventor： Vijay Ganwani ,  Ankit Sethi

IPC: H04L1/00 ,  H03M13/23 ,  H03M13/00 ,  H04L29/06

Abstract: A receiver device generates a bit stream corresponding to a received signal at least by demodulating the received signal. The received signal includes an address that was encoded at a transmitter device using a forward error correction code. The receiver device correlates the bit stream with an encoded known address to generate a correlation output that indicates a degree of similarity between a segment of the bit stream and the encoded known address. The encoded known address corresponds to a known device address that was encoded using the error correction code. The receiver device determines when the correlation output is greater than a threshold that corresponds to a particular degree of similarity with the encoded known address. The receiver device determines that the bit stream includes the known device address when the receiver device determines that the correlation output is greater than the threshold.