Claims
- 1. A wireless receiver comprising:
for each of a plurality of antenna elements employed to receive a wireless signal, separate channel estimation units and bit metric calculation units, wherein each bit metric calculation unit determines bits for each received symbol from a corresponding antenna element based on a corresponding channel estimate; a signal combiner combining outputs of the separate bit metric calculation units; and a decoder receiving and operating on an output of the signal combiner.
- 2. The wireless receiver according to claim 1, wherein the bit metric calculation units determine a shortest distance between each received symbol and projected constellation symbols within a channel for the corresponding antenna element.
- 3. The wireless receiver according to claim 1, wherein the bit metric calculation units determine, for all bits within a received symbol, a cumulative least squares difference between bits within the received symbol and counterpart bits within constellation symbols modified by the corresponding channel estimate.
- 4. The wireless receiver according to claim 3, wherein the bit metric calculation units selectively set bits within each received symbol to a logical one or a logical zero based upon the cumulative least squares difference.
- 5. The wireless receiver according to claim 1, wherein the received wireless signal is modulated by coded orthogonal frequency division multiplexing.
- 6. A wireless communications system comprising:
a transmitter; a channel by which a wireless signal from the transmitter is transmitted; and a receiver receiving the wireless signal from the channel, wherein the receiver comprises:
for each of a plurality of antenna elements employed to receive a wireless signal, separate channel estimation units and bit metric calculation units, wherein each bit metric calculation unit determines bits for each received symbol from a corresponding antenna element based on a corresponding channel estimate; a signal combiner combining outputs of the separate bit metric calculation units; and a decoder receiving and operating on an output of the signal combiner.
- 7. The wireless communications system according to claim 6, wherein the bit metric calculation units determine a shortest distance between each received symbol and projected constellation symbols within a channel for the corresponding antenna element.
- 8. The wireless communications system according to claim 6, wherein the bit metric calculation units determine, for all bits within a received symbol, a cumulative least squares difference between bits within the received symbol and counterpart bits within constellation symbols modified by the corresponding channel estimate.
- 9. The wireless communications system according to claim 8, wherein the bit metric calculation units selectively set bits within each received symbol to a logical one or a logical zero based upon the cumulative least squares difference.
- 10. The wireless communications system according to claim 6, wherein the wireless signal is modulated by coded orthogonal frequency division multiplexing.
- 11. A method of receiving a wireless signal comprising:
for each of a plurality of antenna elements employed to receive the wireless signal, separately estimating the channel estimation and calculating bit metrics, wherein each bit metric calculation determines bits for each received symbol from a corresponding antenna element based on a corresponding channel estimate; combining outputs of the separate bit metric calculations; and decoding the combined outputs.
- 12. The method according to claim 11, wherein the bit metric calculations further comprise:
determining a shortest distance between each received symbol and projected constellation symbols within a channel for the corresponding antenna element.
- 13. The method according to claim 11, wherein the bit metric calculations further comprise:
determining, for all bits within a received symbol, a cumulative least squares difference between bits within the received symbol and counterpart bits within constellation symbols modified by the corresponding channel estimate.
- 14. The method according to claim 13, wherein the bit metric calculations further comprise:
selectively set bits within each received symbol to a logical one or a logical zero based upon the cumulative least squares difference.
- 15. The method according to claim 11, further comprising:
demodulating the received wireless signal using coded orthogonal frequency division multiplexing.
- 16. A partially processed wireless signal comprising:
separate bit metrics for each of a plurality of antenna elements employed to receive a wireless signal, wherein each bit metric is derived from bits for each received symbol from a corresponding antenna element based on a corresponding channel estimate for that antenna element.
- 17. The partially processed wireless signal according to claim 16, wherein the bit metrics are determined from a shortest distance between each received symbol and projected constellation symbols within a channel for the corresponding antenna element.
- 18. The partially processed wireless signal according to claim 16, wherein the bit metrics are determined a cumulative least squares difference for all bits within a received symbol between bits within the received symbol and counterpart bits within constellation symbols modified by the corresponding channel estimate.
- 19. The partially processed wireless signal according to claim 18, wherein the bit metrics comprise bits within each received symbol selectively set to a logical one or a logical zero based upon the cumulative least squares difference.
- 20. The partially processed wireless signal according to claim 16, wherein the bit metrics correspond to a wireless signal modulated by coded orthogonal frequency division multiplexing.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority to U.S. Provisional Application No. 60/341,508 filed Dec. 13, 2001, the content of which is hereby incorporated by reference.
Provisional Applications (1)
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Number |
Date |
Country |
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60341508 |
Dec 2001 |
US |