Communication method, system, and apparatus that combines aspects of cyclic prefix and zero padding techniques

• US 20040174809A1
• Filed: 08/21/2003
• Published: 09/09/2004
• Est. Priority Date: 02/28/2003
• Status: Active Grant

• Current Assignee: Wisair Limited (Wisair Incorporated)
• Original Assignee: Wisair Limited (Wisair Incorporated)
• Inventors: Shor, Gadi, Goldenberg, Sorin
• Granted Patent: US 6,950,387 B2
• Time in Patent Office: Days
• US Class Current: 370/206
• CPC Class Codes: H04L 1/004 by using forward error control H04L1/0618 takes precedence; coding, decoding or code conversion, for error detection or correction H03M13/00
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/2605 Symbol extensions, e.g. Zero Tail, Unique Word [UW]
• CPC Class Codes: H04L 5/06 the signals being represented by different frequencies combined with time-division multiplexing H04L5/26

Abstract

The present invention provides communication methods, systems, and apparatuses. Methods are provided in which a second signal for transmission is obtained by halving values of an initial portion and a tail portion of a first signal, and adding zeros following the tail portion. Upon or after reception, a third signal is obtained from the received second signal and used in obtaining information. Obtaining each of an initial portion and a tail portion of the third signal includes adding together at least a portion of each of the initial portion and the tail portion of the second signal.

Claims

1. A method for communicating information, the method comprising:

obtaining a first signal;

obtaining a second signal, comprising multiplying each of a value or values of an initial portion of the first signal by a number, and multiplying each of a value or values of a symbol tail portion of the first signal by a number, such that each corresponding pair of initial portion and symbol tail portion values are multiplied by a first number and a second number, respectively, and wherein, for each corresponding pair of initial portion and symbol tail portion values, a sum of the first number and the second number is equal to one; and

upon or after reception of the second signal, obtaining a third signal from the received second signal, the third signal being used in obtaining information, wherein obtaining each of an initial portion and a tail portion of the third signal comprises adding together at least a portion of each of an initial portion and a symbol tail portion of the second signal.

2. The method of claim 1, comprising, due to a multi-path effect, receiving the second signal as a combination of several of the second signal, at least two of the several being staggered in time with respect to each other.

3. A method for communicating information, the method comprising:

obtaining a first signal;

obtaining a second signal by halving values of an initial portion and a tail portion of the first signal, and adding zeros following the tail portion; and

upon or after reception of the second signal, obtaining a third signal from the received second signal, the third signal being used in obtaining information, wherein obtaining each of an initial portion and a tail portion of the third signal comprises adding together at least a portion of each of an initial portion and a tail portion of the second signal.

4. The method of claim 3, comprising, due to a multi-path effect, receiving the second signal as a combination of several of the second signal, at least two of the several being staggered in time with respect to each other.

5. A method for communicating information, the method comprising:

obtaining a first signal that comprises an Inverse Fast Fourier Transform output signal;

obtaining a second signal for transmission using OFDM, by halving values of an initial portion and a tail portion of the first signal, and adding zeros following the tail portion;

upon or after reception of the second signal, obtaining a third signal from the received second signal, wherein obtaining each of an initial portion and a tail portion of the third signal comprises adding together at least a portion of each of an initial portion and a tail portion of the second signal; and

processing at least a portion of the third signal to obtain information.

6. The method of claim 5, comprising, due to a multi-path effect, receiving the second signal as a combination of several of the second signal, at least two of the several being staggered in time with respect to each other.