公开(公告)号：US20150171906A1

公开(公告)日：2015-06-18

申请号：US14109528

申请日：2013-12-17

Applicant: MOTOROLA SOLUTIONS, INC

Inventor： YEW LEONG WONG ,  CHOW LOONG CHEAH ,  LI CHOO CHEN ,  YADUNANDANA N. RAO ,  MOH LIM SIM ,  ONDY DHARMA INDRA SUKMA

IPC: H04B1/12

CPC classification number: H04B1/30 ,  H04B1/1036 ,  H04B2001/1045

Abstract: A very-low intermediate frequency (VLIF) receiver and a method of controlling a VLIF receiver. The method comprises receiving a first signal, the first signal including one or both of an on-channel signal portion and an adjacent channel interferer (ACI) portion; determining that the first signal includes a portion having a strength that is above a threshold; in response to determining that the first signal includes a portion having a strength that is above the threshold, estimating one or more IQ imbalance parameters for at least a portion of the first signal; and compensating for an IQ imbalance in at least the portion of the first signal using the one or more IQ imbalance parameters.

Abstract translation: 一种非常低的中频（VLIF）接收机和一种控制VLIF接收机的方法。 所述方法包括：接收第一信号，所述第一信号包括通道内信号部分和相邻信道干扰源（ACI）部分中的一个或两者; 确定所述第一信号包括具有高于阈值的强度的部分; 响应于确定所述第一信号包括具有高于所述阈值的强度的部分，估计所述第一信号的至少一部分的一个或多个IQ不平衡参数; 以及使用所述一个或多个IQ不平衡参数来补偿所述第一信号的至少所述部分中的IQ不平衡。

公开(公告)号：US20150319591A1

公开(公告)日：2015-11-05

申请号：US14266223

申请日：2014-04-30

Applicant: MOTOROLA SOLUTIONS, INC

Inventor： YADUNANDANA N. RAO ,  SPYROS KYPEROUNTAS

IPC: H04W4/22 ,  H04L12/28 ,  H04W72/04

CPC classification number: H04W4/90 ,  H04B1/0053 ,  H04B1/0057 ,  H04L12/2856

Abstract: Disclosed herein are methods and systems for concurrent narrowband and broadband communication. An embodiment takes the form of a method that involves generating a narrowband public-safety-radio (PSR) signal for transmission on a downlink of a PSR network. The method further involves generating a multicarrier wideband signal for transmission on a downlink of a wireless wide area network (WWAN), where the multicarrier wideband signal includes a null DC subcarrier. The method also involves producing a combined signal that includes the superposition of (i) the narrowband PSR signal centered on a characteristic frequency of the null DC subcarrier and (ii) the multicarrier wideband signal. Additionally, the method involves transmitting the combined signal for receipt of the narrowband PSR signal at the characteristic frequency by at least one public-safety radio and receipt of the multicarrier wideband signal by at least one WWAN access terminal.

Abstract translation: 这里公开了用于并发窄带和宽带通信的方法和系统。 一个实施例采用一种方法的形式，其涉及生成用于在PSR网络的下行链路上传输的窄带公共安全无线电（PSR）信号。 该方法还涉及生成用于在无线广域网（WWAN）的下行链路上传输的多载波宽带信号，其中多载波宽带信号包括零直流副载波。 该方法还包括产生组合信号，该组合信号包括（i）以零直流副载波的特征频率为中心的窄带PSR信号和（ii）多载波宽带信号的叠加。 此外，该方法包括以特征频率通过至少一个公共安全无线电发送用于接收窄带PSR信号的组合信号，以及由至少一个WWAN接入终端接收多载波宽带信号。

公开(公告)号：US20140269851A1

公开(公告)日：2014-09-18

申请号：US13834618

申请日：2013-03-15

Applicant: MOTOROLA SOLUTIONS, INC.

Inventor： YADUNANDANA N. RAO ,  RaviTeja Chinta ,  Daniel A. Tealdi

IPC: H04B1/7093

CPC classification number: H04B1/7093 ,  G01S5/0215 ,  G01S5/14 ,  G01S11/08 ,  H04B2001/6912

Abstract: Systems, devices, and methods to improve signal detection of a receiver in communication systems, including receiving a signal having one or more distorted versions of a predetermined waveform as well as processing the received signal with a plurality of eigenfilters generated from eigenvectors of a covariance matrix of the predetermined waveform. Further a correlation output is generated by further processing the received signal with at least one matched filter formed from an eigenfiltered version of the predetermined waveform and identifying at least one peak in the correlator output. The peak may be used to improve performance of the receiver.

Abstract translation: 用于改进通信系统中的接收机的信号检测的系统，设备和方法，包括接收具有预定波形的一个或多个失真版本的信号以及使用由协方差矩阵的特征向量生成的多个特征滤波器来处理接收信号 的预定波形。 此外，通过使用由预定波形的本征滤波版本形成的至少一个匹配滤波器进一步处理接收信号并且识别相关器输出中的至少一个峰值来产生相关输出。 该峰值可用于提高接收机的性能。