Cyclic shift delays in multi-user packets with resolvable very high throughput long training fields (VHTLTFs)
A system including a training field generator module, a stream generator module, and a cyclic shift delay module. The training field generator module generates training fields to be transmitted in a packet to client stations. The stream generator module generates streams to be transmitted in the packet. First streams (i) are designated for a first client station and (ii) include the training fields. Second streams (i) are designated for a second client station and (ii) include the training fields. The cyclic shift delay module applies cyclic shift delay values to the streams. First cyclic shift delay values are respectively applied to the first streams. Second cyclic shift delay values are respectively applied to the second streams. At least one of the second cyclic shift delay values is equal to one of the first cyclic shift delay values. Alternatively, the second values are different than the first values.
1. A system comprising:
a training field generator module configured to generate a plurality of training fields to be transmitted in a packet to a plurality of client stations;
a stream generator module configured to generate a plurality of streams to be transmitted in the packet, wherein first streams of the plurality of streams (i) are designated for a first client station of the plurality of client stations and (ii) include the plurality of training fields, and wherein second streams of the plurality of streams (i) are designated for a second client station of the plurality of client stations and (ii) include the plurality of training fields; and
a cyclic shift delay module configured to apply a plurality of cyclic shift delay values to the plurality of streams,
wherein first values from the plurality of cyclic shift delay values are respectively applied to the first streams, wherein second values from the plurality of cyclic shift delay values are respectively applied to the second streams, and wherein at least one of the second values is equal to one of the first values; and
wherein a total number of training fields transmitted to each of the plurality of client stations is equal to a total number of streams in the plurality of streams.
2. The system of claim 1 , wherein a total number of training fields in the plurality of training fields is a function of a total number of streams in the plurality of streams.
3. The system of claim 1 , further comprising the first client station, wherein the first client station is configured to:
generate, based on the plurality of training fields, (i) a first channel estimate for the first streams and (ii) a second channel estimate for the second streams; and
suppress interference due to the second streams based on (i) first channel estimate and (ii) the second channel estimate.
4. The system of claim 1 , wherein the packet includes (i) a preamble portion that includes the plurality of training fields and (ii) a data portion that includes data for the plurality of client stations, and wherein the cyclic shift delay module is configured to apply the cyclic shift delay values to the data portion consistently with the cyclic shift delay values applied to the preamble portion.
5. The system of claim 1 , wherein the cyclic shift delay module is configured to apply the cyclic shift delay values to the plurality of streams independently of actual values of the cyclic shift delay values.
6. The system of claim 1 , further comprising a mapping module configured to spatially map the plurality of streams after the cyclic shift delay module applies the cyclic shift delay values to the plurality of streams.
7. A system comprising:
a training field generator module configured to generate a plurality of training fields to be transmitted in a packet to a plurality of client stations;
a stream generator module configured to generate a plurality of streams to be transmitted in the packet, wherein first streams of the plurality of streams (i) are designated for a first client station of the plurality of client stations and (ii) include the plurality of training fields, and wherein second streams of the plurality of streams (i) are designated for a second client station of the plurality of client stations and (ii) include the plurality of training fields; and
a cyclic shift delay module configured to apply a plurality of cyclic shift delay values to the plurality of streams,
wherein first values from the plurality of cyclic shift delay values are respectively applied to the first streams, wherein second values from the plurality of cyclic shift delay values are respectively applied to the second streams, and wherein the second values are different than the first values; and
wherein a total number of training fields in the plurality of training fields is a function of a total number of streams in the plurality of streams.
8. The system of claim 7 , wherein a total number of training fields transmitted to each of the plurality of client stations is equal to a total number of streams in the plurality of streams.
9. The system of claim 7 , further comprising the first client station, wherein the first client station is configured to:
generate, based on the plurality of training fields, (i) a first channel estimate for the first streams and (ii) a second channel estimate for the second streams; and
suppress interference due to the second streams based on (i) first channel estimate and (ii) the second channel estimate.
10. The system of claim 7 , further comprising a mapping module configured to spatially map the plurality of streams after the cyclic shift delay module applies the cyclic shift delay values to the plurality of streams.
11. A system comprising:
a training field generator module configured to generate a plurality of training fields to be transmitted in a packet to a plurality of client stations;
a stream generator module configured to generate a plurality of streams to be transmitted in the packet, wherein first streams of the plurality of streams (i) are designated for a first client station of the plurality of client stations and (ii) include the plurality of training fields, and wherein second streams of the plurality of streams (i) are designated for a second client station of the plurality of client stations and (ii) include the plurality of training fields; and
a cyclic shift delay module configured to apply a plurality of cyclic shift delay values to the plurality of streams,
wherein first values from the plurality of cyclic shift delay values are respectively applied to the first streams, wherein second values from the plurality of cyclic shift delay values are respectively applied to the second streams, and wherein the second values are different than the first values; and
wherein the packet includes (i) a preamble portion that includes the plurality of training fields and (ii) a data portion that includes data for the plurality of client stations, and wherein the cyclic shift delay module is configured to apply the cyclic shift delay values to the data portion consistently with the cyclic shift delay values applied to the preamble portion.
12. A system comprising:
a training field generator module configured to generate a plurality of training fields to be transmitted in a packet to a plurality of client stations;
a stream generator module configured to generate a plurality of streams to be transmitted in the packet, wherein first streams of the plurality of streams (i) are designated for a first client station of the plurality of client stations and (ii) include the plurality of training fields, and wherein second streams of the plurality of streams (i) are designated for a second client station of the plurality of client stations and (ii) include the plurality of training fields; and
a cyclic shift delay module configured to apply a plurality of cyclic shift delay values to the plurality of streams,
wherein first values from the plurality of cyclic shift delay values are respectively applied to the first streams, wherein second values from the plurality of cyclic shift delay values are respectively applied to the second streams, and wherein the second values are different than the first values; and
wherein the cyclic shift delay module is configured to apply the cyclic shift delay values to the plurality of streams independently of actual values of the cyclic shift delay values.
13. A method comprising:
generating a plurality of training fields to be transmitted in a packet to a plurality of client stations;
generating a plurality of streams to be transmitted in the packet, wherein first streams of the plurality of streams (i) are designated for a first client station of the plurality of client stations and (ii) include the plurality of training fields, and wherein second streams of the plurality of streams (i) are designated for a second client station of the plurality of client stations and (ii) include the plurality of training fields; and
applying a plurality of cyclic shift delay values to the plurality of streams,
wherein first values from the plurality of cyclic shift delay values are respectively applied to the first streams, wherein second values from the plurality of cyclic shift delay values are respectively applied to the second streams, and wherein (i) at least one of the second values is equal to one of the first values or (ii) the second values are different than the first values; and
wherein (i) a total number of training fields in the plurality of training fields is a function of a total number of streams in the plurality of streams, or (ii) a total number of training fields transmitted to each of the plurality of client stations is equal to a total number of streams in the plurality of streams.
14. The method of claim 13 , further comprising, at the first client station:
generating, based on the plurality of training fields, (i) a first channel estimate for the first streams and (ii) a second channel estimate for the second streams; and
suppressing interference due to the second streams based on (i) first channel estimate and (ii) the second channel estimate.
15. The method of claim 13 , further comprising spatially mapping the plurality of streams after applying the cyclic shift delay values to the plurality of streams.
16. A method comprising:
generating a plurality of training fields to be transmitted in a packet to a plurality of client stations;
generating a plurality of streams to be transmitted in the packet, wherein first streams of the plurality of streams (i) are designated for a first client station of the plurality of client stations and (ii) include the plurality of training fields, and wherein second streams of the plurality of streams (i) are designated for a second client station of the plurality of client stations and (ii) include the plurality of training fields; and
applying a plurality of cyclic shift delay values to the plurality of streams,
wherein first values from the plurality of cyclic shift delay values are respectively applied to the first streams, wherein second values from the plurality of cyclic shift delay values are respectively applied to the second streams, and wherein (i) at least one of the second values is equal to one of the first values or (ii) the second values are different than the first values; and
wherein the packet includes (i) a preamble portion that includes the plurality of training fields and (ii) a data portion that includes data for the plurality of client stations, the method further comprising applying the cyclic shift delay values to the data portion consistently with the cyclic shift delay values applied to the preamble portion.
17. A method comprising:
generating a plurality of training fields to be transmitted in a packet to a plurality of client stations;
generating a plurality of streams to be transmitted in the packet, wherein first streams of the plurality of streams (i) are designated for a first client station of the plurality of client stations and (ii) include the plurality of training fields, and wherein second streams of the plurality of streams (i) are designated for a second client station of the plurality of client stations and (ii) include the plurality of training fields; and
applying a plurality of cyclic shift delay values to the plurality of streams independently of actual values of the cyclic shift delay values,
wherein first values from the plurality of cyclic shift delay values are respectively applied to the first streams, wherein second values from the plurality of cyclic shift delay values are respectively applied to the second streams, and wherein (i) at least one of the second values is equal to one of the first values or (ii) the second values are different than the first values.