ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) COMMUNICATIONS DEVICE AND METHOD THAT INCORPORATES LOW PAPR PREAMBLE AND FREQUENCY HOPPING
First Claim
1. A communications device, comprising:
- a source of communications data and a training sequence corresponding to a preamble;
a modulation and mapping circuit that modulates the communications data and training sequence into a plurality of multiple subcarriers that are orthogonal to each other to form an Orthogonal Frequency Division Multiplexing (OFDM) communications signal having modulated subcarriers carrying the communications data forming a data payload and modulated subcarriers forming the preamble;
a pseudo-random signal generator operative with the modulation and mapping circuit for generating pseudo-random signals to the modulation and mapping circuit based on an encryption algorithm for frequency hopping each subcarrier at an OFDM symbol rate; and
wherein said 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 about a PAPR value of 2.6 decibels (dB).
5 Assignments
0 Petitions
Accused Products
Abstract
A communications device includes communication 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 communications signal having modulated subcarriers carrying the communications data forming a data payload and modulated subcarriers forming the preamble. A pseudo-random signal generator is operative with the modulation and mapping circuit and generates pseudo-random signals based on an encryption algorithm for frequency hopping each subcarrier at an OFDM symbol rate. 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).
-
Citations
25 Claims
-
1. A communications device, comprising:
-
a source of communications data and a training sequence corresponding to a preamble; a modulation and mapping circuit that modulates the communications data and training sequence into a plurality of multiple subcarriers that are orthogonal to each other to form an Orthogonal Frequency Division Multiplexing (OFDM) communications signal having modulated subcarriers carrying the communications data forming a data payload and modulated subcarriers forming the preamble; a pseudo-random signal generator operative with the modulation and mapping circuit for generating pseudo-random signals to the modulation and mapping circuit based on an encryption algorithm for frequency hopping each subcarrier at an OFDM symbol rate; and wherein said 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 about a PAPR value of 2.6 decibels (dB). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method of communicating data, comprising:
-
receiving communications data to be transmitted and a training sequence corresponding to a preamble; generating an Orthogonal Frequency Division Multiplexing (OFDM) communications signal having modulated subcarriers carrying the communications data forming a data payload and subcarriers carrying the training sequences forming the preamble; generating pseudo-random signals to a modulation and mapping circuit based on an encryption algorithm and frequency hopping each subcarrier at an OFDM symbol rate; applying quadratic phase modulation to subcarriers carrying the training sequences to produce a low peak-to-average power ratio (PAPR) preamble with about a PAPR value of 2.6 decibels (dB); and transmitting the OFDM communications signal along a communications channel to a receiver. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A method of communicating data, comprising:
-
receiving communications data to be transmitted and a training sequence corresponding to a preamble; generating an Orthogonal Frequency Division Multiplexing (OFDM) communications signal having modulated subcarriers carrying the communications data forming a data payload and subcarriers carrying training sequences forming the preamble, wherein the preamble includes a long sync sequence for acquisition, detection, frequency and channel estimation having a guard interval (GI); generating pseudo-random signals to a modulation and mapping circuit based on an encryption algorithm and frequency hopping each subcarrier at an OFDM symbol rate; applying a quadratic phase modulation to subcarriers carrying the training sequences to produce a low peak-to-average power ratio (PAPR) preamble with about a PAPR value of 2.6 decibels (dB); and splitting the guard interval from the long sync sequence and processing into values that represent the inverse low PAPR preamble as plus or minus one (+/−
1) values in a real or imaginary component as adds and subtracts for channel estimation. - View Dependent Claims (22, 23, 24, 25)
-
Specification