FEC in cognitive multi-user OFDMA
First Claim
1. A method of wireless communication comprising the acts, carried out by a first computing device, of:
- a) detecting transmission errors on a set of OFDM subchannels based on decoding received wireless communications using an error correction code, the received wireless communications being received with a receiver;
b) identifying a plurality of undesirable subchannels from the set of OFDM subchannels based at least in part on the errors detected in act (a); and
c) broadcasting an identity of the plurality of undesirable subchannels in a transmitted wireless communication.
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Accused Products
Abstract
A multiuser scheme allowing for a number of users, sets of user, or carriers to share one or more channels is provided. In the invention, the available channel bandwidth is subdivided into a number of equal-bandwidth subchannels according to standard OFDM practice. A transmitter transmits data on a set of OFDM subchannels that need not be contiguous in the spectrum or belong to the same OFDM channel. A receiver receives and decodes the data and detects errors on subchannels. The receiver then broadcasts the identity of those subchannels on which the error rate exceeds a specific threshold, and the transmitter may select different subchannels for transmission based on this information.
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Citations
20 Claims
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1. A method of wireless communication comprising the acts, carried out by a first computing device, of:
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a) detecting transmission errors on a set of OFDM subchannels based on decoding received wireless communications using an error correction code, the received wireless communications being received with a receiver; b) identifying a plurality of undesirable subchannels from the set of OFDM subchannels based at least in part on the errors detected in act (a); and c) broadcasting an identity of the plurality of undesirable subchannels in a transmitted wireless communication. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A wireless receiver for receiving OFDM transmissions, the receiver comprising:
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at least one processor programmed to act as; an error detection module for determining transmission errors on a set of OFDM subchannels based on decoding received wireless communications using an error correction code; an identification module for identifying low fidelity subchannels from the set of OFDM subchannels based at least in part on the determined transmission errors; and a broadcasting module for broadcasting a vector representing the low fidelity subchannels. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A computer-readable storage medium having computer-executable instructions that, as a result of being executed by a computer, instruct the computer to perform a method of wireless communication, the method comprising acts carried out by a first computing device of:
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a) wirelessly receiving data in an OFDM signal; b) performing error detection on the received data by decoding received wireless communications using an error correction code; c) identifying OFDM subchannels in which errors were detected, based on the error detection in b); and d) advertising the OFDM subchannels in which errors were detected. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification