Identification of packet traffic transmitted by various devices operated in multiple overlapped frequency bands in packet-based OFDM systems

• US 10,637,971 B2
• Filed: 09/28/2018
• Issued: 04/28/2020
• Est. Priority Date: 08/25/2008
• Status: Active Grant

• Current Assignee: Applied Transform LLC
• Original Assignee: Applied Transform LLC
• Inventors: Kim, Joon Bae
• Primary Examiner(s): Anwar, Mohammad S
• Application Number:
  US16/145,971
• Publication Number:
  US 20190037056A1
• Time in Patent Office: 578 Days
• CPC Class Codes: H04L 1/0042 Encoding specially adapted to other signal generation operation, e.g. in order to reduce transmit distortions, jitter, or to improve signal shape H04L1/0067 takes precedence
• CPC Class Codes: H04L 1/0056 Systems characterized by the type of code used H04L1/08 takes precedence
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 1/04 using frequency diversity
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/26025 Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking allocating sub-channels of the transmission path H04L5/003
• CPC Class Codes: H04L 45/74 Address processing for routing
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

Techniques for header encoding include encoding a plurality of bits using a forward error correction code, generating an FEC codeword comprising a plurality of encoded bits, and concatenating a first copy of the FEC codeword with a second copy of the FEC codeword, wherein the concatenating comprises cyclically shifting by two bits the second concatenated copy of the FEC codeword relative to the first concatenated copy of the FEC codeword, wherein the encoded bits of the first and second copies of the FEC codewords are modulated on at least one OFDM symbol. techniques for header decoding include receiving a plurality of encoded bits comprising at least two concatenated copies of an FEC codeword, decoding a first copy of the FEC codeword to generate a first plurality of decoded bits, and decoding a second copy of the FEC codeword to generate a second plurality of decoded bits.

Claims

1. A wireless transmitter capable of header encoding comprising:

an FEC encoder operable to encode a plurality of bits using a forward error correction code and capable of generating an FEC codeword comprising a plurality of encoded bits; and

a header encoder operable to concatenate a first copy of the FEC codeword with a second copy of the FEC codeword, wherein the concatenating comprises cyclically shifting by two bits the second concatenated copy of the FEC codeword relative to the first concatenated copy of the FEC codeword.

2. The wireless transmitter of claim 1, further comprising a modulator operable to modulate the encoded bits of the first and second copies of the FEC codewords on at least one OFDM symbol.

3. A method in a wireless transmitter capable of header encoding, the method comprising:

encoding, by an FEC encoder, a plurality of bits using a forward error correction code;

generating, by the FEC encoder, an FEC codeword comprising a plurality of encoded bits; and

concatenating, by a header encoder, a first copy of the FEC codeword with a second copy of the FEC codeword, wherein the concatenating comprises cyclically shifting by two bits the second concatenated copy of the FEC codeword relative to the first concatenated copy of the FEC codeword.

4. The method of claim 3, further comprising modulating, by a modulator, the encoded bits of the first and second copies of the FEC codewords on at least one OFDM symbol.

5. A wireless transmitter capable of header encoding, the transceiver comprising:

means for encoding a plurality of bits using a forward error correction code;

means for generating an FEC codeword comprising a plurality of encoded bits; and

means for concatenating a first copy of the FEC codeword with a second copy of the FEC codeword, wherein the concatenating comprises cyclically shifting by two bits the second concatenated copy of the FEC codeword relative to the first concatenated copy of the FEC codeword.

6. The transceiver of claim 5, further comprising means for modulating the encoded bits of the first and second copies of the FEC codewords on at least one OFDM symbol.