Interference cancellation technique for channel estimation in OFDM receivers
First Claim
1. A method for determining an estimation of interferences when receiving an Orthogonal Frequency-Division Multiplexing (OFDM) signal made of packets, each packet including at least one training field, at least two header fields and a data field, the method comprising:
- detecting a first symbol value (D1) of a first header field and a second symbol value (D2) of a second header field, said first and second header fields belonging to said at least two header fields, and said first and second header fields having been transmitted after being modulated using different modulation schemes, respectively; and
determining said estimation of interferences from said first and second symbol values,wherein the determining of said estimation consists in solving a system of two linear equations, wherein re_int and im_int are respectively a real part and an imaginary part of said estimation;
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Abstract
An interference cancellation technique is implemented in a receiver adapted for determining an estimation of interferences when receiving an OFDM signal made of packets. Each packet includes a first training field, a second training field, a first header field, a second header field and a data field. The receiver detects a first symbol value of the first header field, and a second symbol value of the second header field, the first and the second header fields having been modulated using different modulation schemes. The estimation of interferences is determined using the first and the second symbol values.
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Citations
13 Claims
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1. A method for determining an estimation of interferences when receiving an Orthogonal Frequency-Division Multiplexing (OFDM) signal made of packets, each packet including at least one training field, at least two header fields and a data field, the method comprising:
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detecting a first symbol value (D1) of a first header field and a second symbol value (D2) of a second header field, said first and second header fields belonging to said at least two header fields, and said first and second header fields having been transmitted after being modulated using different modulation schemes, respectively; and determining said estimation of interferences from said first and second symbol values, wherein the determining of said estimation consists in solving a system of two linear equations, wherein re_int and im_int are respectively a real part and an imaginary part of said estimation; - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A receiver adapted for determining an estimation of interferences when receiving an Orthogonal Frequency-Division Multiplexing (OFDM) signal made of packets, each packet including a first training field, a second training field, at least two header fields and a data field, the receiver comprising:
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circuitry for detecting a first symbol value of a first header field and a second symbol value of a second header field, said first and second header fields belonging to said at least two header fields and said first and second header fields having been transmitted after being modulated using different modulation schemes, respectively; and circuitry for determining said estimation of interferences from said first and second symbol values, wherein said circuitry for determining said estimation is adapted to solve a system of two linear equations, wherein re_int and im_int are respectively a real part and an imaginary part of said estimation; - View Dependent Claims (9, 10, 11, 12, 13)
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Specification