SIGNALING METHOD IN AN OFDM MULTIPLE ACCESS SYSTEM
First Claim
1. A digital processing system utilized in a transmitter that generates a transmission signal, the system comprising:
- a first circuit that receives a discrete signal of complex data symbols, calculates a frequency response of the discrete signal, and outputs a first vector of length M;
a second circuit that receives the vector of length M and generates a second vector of length N, wherein the second vector of length N includes elements of the first vector at positions corresponding to tones allocated to the transmitter; and
a third circuit that receives the second vector and generates a digital time domain vector therefrom for transmission by the transmitter.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for reducing the peak-to-average ratio in an OFDM communication signal is provided. The method includes defining a constellation having a plurality of symbols, defining a symbol duration for the OFDM communication signal, and defining a plurality of time instants in the symbol duration. A plurality of tones are allocated to a particular communication device, and a discrete signal is constructed in the time domain by mapping symbols from the constellation to the time instants. A continuous signal is generated by applying an interpolation function to the discrete signal such that the continuous signal only includes sinusoids having frequencies which are equal to the allocated tones.
-
Citations
20 Claims
-
1. A digital processing system utilized in a transmitter that generates a transmission signal, the system comprising:
-
a first circuit that receives a discrete signal of complex data symbols, calculates a frequency response of the discrete signal, and outputs a first vector of length M; a second circuit that receives the vector of length M and generates a second vector of length N, wherein the second vector of length N includes elements of the first vector at positions corresponding to tones allocated to the transmitter; and a third circuit that receives the second vector and generates a digital time domain vector therefrom for transmission by the transmitter. - View Dependent Claims (2, 3, 4)
-
-
5. The digital processing system of 1, wherein the vector of length N is larger than the vector of length M.
-
6. The digital processing system of 1, wherein the digital time domain vector comprises equally spaced tones.
-
7. The digital processing system of 5, wherein the digital time domain vector comprises equally spaced tones.
-
8. The digital processing system of 4, wherein the vector of length N is larger than the vector of length M.
-
9. The digital processing system of 4, wherein the digital time domain vector comprises equally spaced tones.
-
10. The digital processing system of 9, wherein the digital time domain vector comprises equally spaced tones.
-
11. An apparatus that generates a transmission signal, the apparatus comprising:
-
means for receiving a discrete signal of complex data symbols, calculates a frequency response of the discrete signal, and outputs a first vector of length M; means for receiving the vector of length M and generates a second vector of length N, wherein the second vector of length N includes elements of the first vector at positions corresponding to tones allocated to a transmitter; and means for generating a digital time domain vector of the second vector for transmission by the transmitter. - View Dependent Claims (12, 13, 14)
-
-
15. The apparatus of 11, wherein the vector of length N is larger than the vector of length M.
-
16. The apparatus of 11, wherein the digital time domain vector comprises equally spaced tones.
-
17. The apparatus of 15, wherein the digital time domain vector comprises equally spaced tones.
-
18. The apparatus of 14, wherein the vector of length N is larger than the vector of length M.
-
19. The apparatus of 14, wherein the digital time domain vector comprises equally spaced tones.
-
20. The apparatus of 19, wherein the digital time domain vector comprises equally spaced tones.
Specification