发明授权
US08175178B2 Orthogonal frequency division multiplexing (OFDM) communications device and method that incorporates low PAPR preamble and variable number of OFDM subcarriers
有权
正交频分复用（OFDM）通信设备和方法，其包括低PAPR前导码和可变数量的OFDM子载波
- 专利标题： Orthogonal frequency division multiplexing (OFDM) communications device and method that incorporates low PAPR preamble and variable number of OFDM subcarriers
- 专利标题（中）： 正交频分复用（OFDM）通信设备和方法，其包括低PAPR前导码和可变数量的OFDM子载波
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申请号： US12242958申请日： 2008-10-01
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公开(公告)号： US08175178B2公开(公告)日： 2012-05-08
- 发明人: Christopher D. Moffatt , John E. Hoffmann
- 申请人： Christopher D. Moffatt , John E. Hoffmann
- 申请人地址： US FL Melbourne
- 专利权人： Harris Corporation
- 当前专利权人： Harris Corporation
- 当前专利权人地址： US FL Melbourne
- 代理机构： Allen, Dyer, Doppelt, Milbrath & Gilchrist, P.A.
- 主分类号： H04K1/10
- IPC分类号： H04K1/10 ; H04L27/00
摘要：
A communications device includes communications data and a training sequence corresponding to a preamble. A modulation and mapping circuit modulates the communications data and training sequence into a plurality of multiple subcarriers that are orthogonal to each other to form an OFDM communication signal having modulated subcarriers carrying the communications data forming a data payload and modulated subcarriers forming the preamble. A circuit turns OFF and ON selected subcarriers based on an encryption algorithm to increase transmit power and signal-to-noise ratio and reduce the Inter-Carrier Interference (ICI). The modulation and mapping circuit applies a quadratic modulation to the subcarriers carrying the training sequences to produce a low peak-to-average power ratio (PAPR) preamble with a PAPR value of approximately 2.6 decibels (dB).
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