Cross-correlation reduction for control signals
First Claim
1. A method for wireless communications at a wireless device, comprising:
- determining symbol information associated with a candidate codeword of a control channel, the candidate codeword encoded according to a forward error correction code;
applying an orthogonal cover code to the symbol information to obtain demasked symbol information for the candidate codeword;
descrambling the demasked symbol information with a scrambling code to obtain descrambled symbol information for the candidate codeword;
performing a decoding operation on the descrambled symbol information according to the forward error correction code; and
communicating with a second wireless device based at least in part on a result of the decoding operation.
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Accused Products
Abstract
Methods, systems, and devices for wireless communications are described. In accordance with the described techniques, communicating devices (e.g., an encoder and decoder) may apply an orthogonal cover code to a polar codeword to reduce cross-correlation between different codewords. For example, such techniques may reduce power consumption at a decoding device by providing for earlier decoding termination (e.g., as a result of the reduced cross-correlation). Techniques for generating the cover codes (e.g., on a per-aggregation level basis) and applying the cover codes (e.g., within a search space) are described. Additionally or alternatively, the described techniques may relate to seeding of reference signals used to support decoding of the codewords. Improved orthogonality between reference signal seeds may further suppress codeword recipient ambiguity.
7 Citations
30 Claims
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1. A method for wireless communications at a wireless device, comprising:
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determining symbol information associated with a candidate codeword of a control channel, the candidate codeword encoded according to a forward error correction code; applying an orthogonal cover code to the symbol information to obtain demasked symbol information for the candidate codeword; descrambling the demasked symbol information with a scrambling code to obtain descrambled symbol information for the candidate codeword; performing a decoding operation on the descrambled symbol information according to the forward error correction code; and communicating with a second wireless device based at least in part on a result of the decoding operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for wireless communications at a wireless device, comprising:
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generating a codeword based at least in part on applying a forward error correction encoding operation to a bit vector, the bit vector comprising control information for a second wireless device; scrambling symbols of the codeword with a scrambling code to obtain scrambled symbol information associated with the codeword; applying an orthogonal cover code to the scrambled symbol information to generate masked scrambled symbol information associated with the codeword; and transmitting the masked scrambled symbol information to the second wireless device in a control channel. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An apparatus for wireless communications, comprising:
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a processor, memory in electronic communication with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to; determine symbol information associated with a candidate codeword of a control channel, the candidate codeword encoded according to a forward error correction code; apply an orthogonal cover code to the symbol information to obtain demasked symbol information for the candidate codeword; descramble the demasked symbol information with a scrambling code to obtain descrambled symbol information for the candidate codeword; perform a decoding operation on the descrambled symbol information according to the forward error correction code; and communicate with a second wireless device based at least in part on a result of the decoding operation. - View Dependent Claims (28)
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29. An apparatus for wireless communications, comprising:
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a processor, memory in electronic communication with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to; generate a codeword based at least in part on applying a forward error correction encoding operation to a bit vector, the bit vector comprising control information for a second wireless device; scramble symbols of the codeword with a scrambling code to obtain scrambled symbol information associated with the codeword; apply an orthogonal cover code to the scrambled symbol information to generate masked scrambled symbol information associated with the codeword; and transmit the masked scrambled symbol information to the second wireless device in a control channel. - View Dependent Claims (30)
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Specification