Signal field encoding and decoding
A method for generating a compressed field addressed to a receiving device comprises generating, using a generator function, a checksum of a field. The field includes an address field and a remaining portion. The method further comprises generating a combined field by combining the checksum with the address field, and generating a compressed field including the combined field and the remaining portion. A method for determining whether the compressed field is addressed to the receiving device comprises receiving the compressed field and determining, using the combined field of the compressed field, an address of the receiving device, and the generator function, whether the compressed field is addressed to the receiving device.
1. A method comprising:
receiving, by a receiving device, a compressed field, the compressed field including a combined field and a remaining portion, the combined field having been generated by combining a destination address and a first checksum, the first checksum having been generated by applying a generator function to the destination address and the remaining portion, wherein the compressed field does not include the destination address;
determining, using the combined field, an address of the receiving device, and the generator function, whether the compressed field is addressed to the receiving device, wherein determining whether the compressed field is addressed to the receiving device comprises:
generating, by performing a bit-wise exclusive-or operation using the combined field and the address of the receiving device, an estimated checksum;
generating a codeword including the address of the receiving device, the remaining portion, and the estimated checksum;
generating, by applying the generator function to the codeword, a remainder; and
comparing the remainder to zero.
2. The method of claim 1 , wherein the generator function is a Cyclic Redundancy Check (CRC) generator function.
3. The method of claim 1 , wherein the compressed field is a High Efficiency Signal B (HE-SIGB) field, and the HE-SIGB field includes information indicating a mapping of a sub-channel of a payload to the receiving device.
4. The method of claim 1 , wherein the address of the receiving device is an Association Identifier (AID) or a partial AID corresponding to the receiving device in a wireless network.
5. An apparatus comprising a processor and a receiver,
wherein the receiver is configured to receive a compressed field, the compressed field including a combined field and a remaining portion, the combined field having been generated by combining a destination address and a first checksum, the first checksum having been generated by applying a generator function to the destination address and the remaining portion, wherein the compressed field does not include the destination address; and
wherein the processor is configured to determine, using the combined field, an address of the apparatus, and the generator function, whether the compressed field is addressed to the apparatus, wherein the processor is configured to determine whether the destination address corresponds to the address of the apparatus by:
generating, by performing a bit-wise exclusive-or operation using the combined field and the address of the apparatus, an estimated checksum;
generating a codeword including the address of the apparatus, the remaining portion, and the estimated checksum;
generating, by applying the generator function to the codeword, a remainder; and
comparing the remainder to zero.
6. The apparatus of claim 5 , wherein the generator function is a Cyclic Redundancy Check (CRC) generator function.