Invention Grant
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
- Patent Title: Orthogonal frequency division multiplexing (OFDM) communications device and method that incorporates low PAPR preamble and variable number of OFDM subcarriers
- Patent Title (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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Application No.: US12242958Application Date: 2008-10-01
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Publication No.: US08175178B2Publication Date: 2012-05-08
- Inventor: Christopher D. Moffatt , John E. Hoffmann
- Applicant: Christopher D. Moffatt , John E. Hoffmann
- Applicant Address: US FL Melbourne
- Assignee: Harris Corporation
- Current Assignee: Harris Corporation
- Current Assignee Address: US FL Melbourne
- Agency: Allen, Dyer, Doppelt, Milbrath & Gilchrist, P.A.
- Main IPC: H04K1/10
- IPC: H04K1/10 ; H04L27/00
Abstract:
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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