Apparatus, and associated method, for detecting data communicated to a receiving station in a multiple-channel communication system
View Patent ↗Apparatus, and an associated method, for recovering the informational content of data in an MIMO-OFDM communication system. Different data sets are communicated upon different subcarriers to a receiving station. Apparatus at the receiving station performs data value estimations based upon the communication conditions on the different subcarriers upon which the data is communicated. Separate path length estimations are performed upon the data communicated upon the different subcarriers, at complexity levels responsive to the communication conditions of the subcarriers.
1. An apparatus comprising:
a selector configured to select metric calculator values for respective ones of a plurality of channels in a Multiple-Input, Multiple-Output communication system in which transmit data is communicated to a receiving station upon the plurality of channels and received as receive data thereat, the metric calculator values selected for at least two of the channels differing from one another; and
a decoder configured to separately decode values of the receive data received upon separate ones of the channels,
wherein, for the values of the receive data received upon each of the channels, the decoder being configured to decode the values of the receive data includes being configured to perform a path length estimation for the respective channel, including being configured to calculate a path length for each of a number of possible paths upon which to estimate a minimum path length, the number of possible paths being selected based on the metric calculator value selected for the respective channel.
2. The apparatus of claim 1 , wherein the decoder is configured to perform a separate path-length estimation for each of the channels.
3. The apparatus of claim 2 , wherein the decoder is configured to calculate a path length for each of a number of possible paths defined by possible values of the transmit data.
4. The apparatus of claim 2 , wherein the decoder being configured to perform a path length estimation includes being configured to estimate a maximum likelihood path.
5. The apparatus of claim 4 , wherein the decoder being configured to estimate a maximum likelihood path includes being configured to estimate a maximum likelihood path using a QRD (QR Decomposition) technique upon the selected number of possible paths.
6. The apparatus of claim 1 , wherein the selector is configured to select the metric calculator values based on communication conditions upon the respective channels.
7. The apparatus of claim 6 , wherein the selector is configured to receive indications of the communication conditions upon the respective channels, the selector being configured to select the metric calculator values based on the indications.
8. The apparatus of claim 6 , wherein selected number of possible paths is inversely related to the communication conditions such that the number of possible paths increases when the communication conditions worsen.
9. The apparatus of claim 1 , wherein the communication system operates pursuant to an OFDM (Orthogonal Frequency Division Multiplexing) scheme in which channels are defined upon channel subcarriers, and wherein the metric calculator values selected by the selector are representative of communication conditions upon respective channel subcarriers.
10. The apparatus of claim 9 , wherein the metric calculator values are maintained at a storage table, and wherein the selector is configured to select metric calculator values from the values maintained at the storage table.
11. The apparatus of claim 9 , wherein the selector is configured to dynamically select the metric calculator values.
12. A method comprising:
selecting metric calculator values for respective ones of a plurality of channels in a Multiple-Input, Multiple-Output communication system in which transmit data is communicated to a receiving station upon the plurality of channels and received as receive data thereat, the metric calculator values selected for at least two of the channels differing from one another; and
separately decoding values of the receive data received upon separate ones of the channels,
wherein, for the values of the receive data received upon each of the channels, decoding the values of the receive data includes performing a path length estimation for the respective channel, including calculating a path length for each of a number of possible paths upon which to estimate a minimum path length, the number of possible paths being selected based on the metric calculator value selected for the respective channel.
13. The method of claim 12 , wherein selecting the metric calculator values comprises selecting the metric calculator values based on communication conditions upon the respective channels.
14. The method of claim 12 wherein performing a path length estimation comprises performing a maximum-likelihood path estimation, including calculating a path length for each of a number of possible paths defined by possible values of the transmit data.
15. The method of claim 12 , wherein selecting the metric calculator values comprises selecting the metric calculator values based on communication conditions upon the respective channels.
16. The method of claim 12 , wherein the communication system operates pursuant to an OFDM (Orthogonal Frequency Division Multiplexing) scheme in which channels are defined upon channel subcarriers, and wherein selecting the metric calculator values comprises selecting the metric calculator values representative of communication conditions upon respective channel subcarriers.
17. An apparatus comprising:
circuitry configured to select metric calculator values for respective ones of a plurality of channels in a Multiple-Input, Multiple-Output communication system in which transmit data is communicated to a receiving station upon the plurality of channels and received as receive data thereat, the metric calculator values selected for at least two of the channels differing from one another,
wherein the circuitry is also configured to separately decode values of the receive data received upon separate ones of the channels, and
wherein, for the values of the receive data received upon each of the channels, the circuitry being configured to decode the values of the receive data includes being configured to perform a path length estimation for the respective channel, including being configured to calculate a path length for each of a number of possible paths upon which to estimate a minimum path length, the number of possible paths being selected based on the metric calculator value selected for the respective channel.
18. The apparatus of claim 17 , wherein the circuitry being configured to perform a path length estimation includes being configured to estimate a maximum likelihood path.
19. The apparatus of claim 18 , wherein the circuitry being configured to estimate a maximum likelihood path includes being configured to estimate a maximum likelihood path using a QRD (QR Decomposition) technique upon the selected number of possible paths.
20. The apparatus of claim 17 , wherein the circuitry is configured to select the metric calculator values based on communication conditions upon the respective channels.