公开(公告)号：US10104621B2

公开(公告)日：2018-10-16

申请号：US14972959

申请日：2015-12-17

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Raghu Ganesan ,  Karthik Ramasubramanian ,  Sarma S. Gunturi

IPC: H04L12/16 ,  H04W52/02 ,  H04L1/00 ,  H04L5/00 ,  H04L27/38 ,  H04W4/70 ,  H04W84/12

Abstract: Systems and methods are provided for packet detection in a wireless local area network transceiver. An antenna is configured to receive a signal, having a carrier frequency. A mixer is configured to mix the received signal with one of the in-phase and quadrature components of the local oscillator to produce a corresponding one of an in-phase downconverted signal and a quadrature phase downconverted signal. A packet detector is configured to determine, from the one of the in-phase downconverted signal and the quadrature phase downconverted signal, if the signal contains a packet of data and instruct a set of components associated with an other of the in-phase and quadrature components of the local oscillator to activate to process the received signal.

公开(公告)号：US20150117575A1

公开(公告)日：2015-04-30

申请号：US14273686

申请日：2014-05-09

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Raghu Ganesan ,  Sarma S. Gunturi

IPC: H04B1/12

CPC classification number: H04L27/2695 ,  H04L25/0224 ,  H04L27/2613 ,  H04L27/266 ,  H04L27/2675

Abstract: A receiver is configured to use a first part of a received signal and a second part of the received signal to determine, respectively, a first estimate and a second estimate of the channel. The first and second parts carry information for decoding the received signal in a first protocol and in a second protocol, respectively. A final estimate of the channel is performed from the first and the second estimates. The final estimate is then used for decoding the data in the received signal according to one of the protocols. A carrier frequency offset from a set of symbols occurring prior to preamble symbols is determined and is corrected for decoding the preamble symbols. The corrected preamble symbols are then used for estimating the channel. In one embodiment, the carrier frequency offset is determined for the multiple antenna packet format used in the 802.11n standard.

Abstract translation: 接收机被配置为使用接收信号的第一部分和接收信号的第二部分来分别确定信道的第一估计和第二估计。 第一和第二部分分别携带用于以第一协议和第二协议解码接收信号的信息。 频道的最终估计是从第一和第二估计进行的。 然后，根据协议之一，最终估计用于对接收信号中的数据进行解码。 确定与在前同步符号之前出现的符号集合的载波频率偏移，并对其进行纠错以对前导码符号进行解码。 然后将经校正的前导码符号用于估计信道。 在一个实施例中，为802.11n标准中使用的多天线分组格式确定载波频率偏移。

公开(公告)号：US20140161202A1

公开(公告)日：2014-06-12

申请号：US13710120

申请日：2012-12-10

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sarma S. Gunturi ,  Atul Deshpande

IPC: H04L27/26

CPC classification number: H04L27/2623

Abstract: A peak-to-average ratio (PAR) of a signal is reduced by clipping the signal at a threshold level and replacing desired frequency tones of the clipped signal with set of frequency tones of the signal. In one embodiment, the PAR of a signal is reduced by adding a peak cancellation signal to the received signal. The peak cancellation signal is generated by clipping the received signal at a threshold level and generating a difference signal by subtracting the received signal from the clipped signal. The peak cancellation signal thus generated is scaled by a scaling factor and added to the received signal to reduce the PAR of the received signal. The scaling factor is adjusted to maintain the desired quality of the received signal. In one embodiment, the PAR of an orthogonal frequency division multiplexed (OFDM) signal may be reduced.

Abstract translation: 信号的峰值平均比（PAR）通过将信号限幅在阈值水平来降低，并且用信号的频率组合的集合来代替限幅信号的期望频率音调。 在一个实施例中，通过向接收信号添加峰值抵消信号来减小信号的PAR。 峰值消除信号是通过将接收信号削波在阈值电平而产生的，并且通过从剪辑信号中减去接收信号来产生差分信号。 由此产生的峰值消除信号由缩放因子缩放并加到接收信号上以减小接收信号的PAR。 调整比例因子以保持接收信号的期望质量。 在一个实施例中，可以减少正交频分复用（OFDM）信号的PAR。