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    System and method for mitigating co-channel interference in white space modems using interference aware techniques
    1.
    发明授权
    System and method for mitigating co-channel interference in white space modems using interference aware techniques 有权

    公开(公告)号：US09949277B1

    公开(公告)日：2018-04-17

    申请号：US15700357

    申请日：2017-09-11

    Applicant: Saankhya Labs Pvt. Ltd.

    Inventor： Sudeep Mirpadi Anand ,  Shrinivas Subramania Bhat ,  Anindya Saha

    IPC: H04B1/00 ,  H04W72/08 ,  H04J11/00 ,  H04W16/14

    CPC classification number: H04W72/082 ,  H04J11/0023 ,  H04W16/14

    Abstract: Disclosed is a system for mitigating co-channel interference (CCI) in white space (WS) modems. The system includes a base-station that includes a base-station transmitter and a base-station receiver. The base-station receiver receives an OFDM signal from one or more CPE transmitters. An interference detection module detects presence of co-channel interference in carriers of the OFDM signal and determines co-channel interference affected carriers. A dynamic notch filter module (i) receives central interference carriers from interference detection module and (ii) mitigates the co-channel interference of co-channel interference affected carriers without affecting frame detection capability of the system. An interference aware signal to noise ratio (SNR) estimation module determines an average signal to noise ratio (SNR) of (i) interference unaffected carriers and (ii) co-channel interference affected carriers. An interference aware de-mapper module processes average signal to noise ratio of (i) interference unaffected carriers and (ii) co-channel interference affected carriers.

    Method and system of ranging and subcarrier allocation in orthogonal frequency division multiple access system
    3.
    发明授权
    Method and system of ranging and subcarrier allocation in orthogonal frequency division multiple access system 有权
    正交频分多址系统中测距和副载波分配的方法和系统

    公开(公告)号：US09210023B1

    公开(公告)日：2015-12-08

    申请号：US14733491

    申请日：2015-06-08

    Applicant: Saankhya Labs Pvt. Ltd

    Inventor： Srinidhi Nagaraja ,  Shrinivas Subramania Bhat

    IPC: H04L27/00 ,  H04L27/26 ,  H04L5/00

    CPC classification number: H04L27/265 ,  H04L5/0021 ,  H04L5/0053 ,  H04L5/0098 ,  H04L27/2613 ,  H04L27/2646 ,  H04L27/2663 ,  H04L27/2672 ,  H04L27/2675 ,  H04L27/2692

    Abstract: A method of ranging and sub-carrier selection in an orthogonal frequency division multiple access (OFDMA) system and the OFDMA system is disclosed. An OFDM symbol is received from a customer premises equipment (CPE) at a base station. The OFDM symbol is demodulated for obtaining a plurality of subcarriers. A plurality of data subcarriers are multiplied by zeros and stored. A plurality of uniformly spaced subcarriers is extracted from the stored subcarriers. A ranging CPE is detected in uniformly spaced subcarriers. Delay estimation is performed using the stored plurality of subcarriers upon detecting presence of ranging CPE. A method of subcarrier allocation at a ranging CPE transmitter based on total number of subcarriers, subcarriers in used band, a delay spread to be supported in terms of number of samples, a required ratio of highest amplitude to second highest amplitude of the ranging signal is disclosed.

    Abstract translation: 公开了一种在正交频分多址（OFDMA）系统和OFDMA系统中的测距和子载波选择的方法。 在基站处从客户驻地设备（CPE）接收OFDM符号。 对OFDM符号进行解调以获得多个子载波。 将多个数据子载波乘以零并存储。 从存储的子载波中提取多个均匀间隔的子载波。 在均匀间隔的子载波中检测到测距CPE。 在检测到测距CPE的存在时，使用所存储的多个子载波执行延迟估计。 基于子载波的总数，使用频带中的子载波，以采样数量支持的延迟扩展，测距信号的最高幅度与第二最高幅度的所需比例，在测距CPE发射机上进行子载波分配的方法是 披露

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