Method and apparatus for improved long preamble formats in a multiple antenna communication system
AssigneeAgere Systems Inc.
InventorSyed A Mujtaba
Life of this patent
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Abstract
Methods and apparatus are provided for improved long preamble formats in a multiple antenna communication system having N antennas. According to one aspect of the invention, a preamble having a legacy portion and a high throughput portion is transmitted (or received) on each of the N transmit antennas, wherein the legacy portion comprises a legacy long training field and the high throughput portion comprises at least N high throughput long training fields, wherein the N high throughput long training fields are transmitted in N time slots using an N×N orthogonal matrix. The orthogonal matrix can be, for example, one or more of a Walsh matrix and a Fourier matrix. The N time slots can optionally comprise a single symbol.
Claims16
A method for transmitting data in a multiple antenna communication system having N transmit antennas, said method comprising the step of:
- transmitting on each of said N transmit antennas a preamble having a legacy portion and a high throughput portion, wherein said legacy portion comprises a legacy long training field and said high throughput portion comprises at least N high throughput long training fields, wherein said N high throughput long training fields are transmitted in N time slots using an N×N orthogonal matrix;
- and
- delaying a transmission of at least a portion of said preamble on a first of said N antennas relative to a transmission of said at least said portion of said preamble on a second of said N antennas, wherein said delay is a non-orthogonal amount to introduce variation across said preambles transmitted on said N transmit antennas.
A multiple antenna communication system comprising:
- N transmit antennas for transmitting a preamble having a legacy portion and a high throughput portion, wherein said legacy portion comprises a legacy long training field and said high throughput portion comprises at least N high throughput long training fields, wherein said N high throughput long training fields are transmitted in N time slots using an N×N orthogonal matrix, wherein a transmission of at least a portion of said preamble on a first of said N antennas is delayed relative to a transmission of said at least said portion of said preamble on a second of said N antennas, wherein said delay is a non-orthogonal amount to introduce variation across said preambles transmitted on said N transmit antennas.
A method for receiving data in a multiple antenna communication system having N receive antennas, said method comprising the step of:
- receiving on each of said N receive antenna a preamble having a legacy portion and a high throughput portion, wherein said legacy portion comprises a legacy long training field and said high throughput portion comprises at least N high throughput long training fields, wherein said N high throughput long training fields are received in N time slots using an N×N orthogonal matrix, wherein at least a portion of said preamble on a first of said N antennas is delayed relative to said at least said portion of said preamble on a second of said N antennas wherein said delay is a non-orthogonal amount to introduce variation across said preambles transmitted on said N transmit antennas.
A multiple antenna communication system, comprising:
- N receive antennas for receiving a preamble having a legacy portion and a high throughput portion, wherein said legacy portion comprises a legacy long training field and said high throughput portion comprises at least N high throughput long training fields, wherein said N high throughput long training fields are received in N time slots using an N×N orthogonal matrix, wherein at least a portion of said preamble on a first of said N antennas is delayed relative to at least said portion of said preamble on a second of said N antennas, wherein said delay is a non- orthogonal amount to introduce variation across said preambles transmitted on said N transmit antennas.
Dependencies are inferred from the claim text.