SIGNALING METHOD AND APPARATUS TO ENABLE MULTIPLE ANTENNA COMMUNICATIONS IN WIRELESS SYSTEMS

• US 20120039321A1
• Filed: 03/24/2010
• Published: 02/16/2012
• Est. Priority Date: 04/10/2009
• Status: Active Grant

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Ghosh, Monisha, Gaddam, Vasanth R.
• Granted Patent: US 8,773,994 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04B 7/0613 using simultaneous transmission H04B7/0686 takes precedence
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 7/042 Detectors therefor, e.g. correlators, state machines digital correlators in general G06F17/15

Abstract

A method (200) for signaling a transmission mode in a wireless communication networks comprises selecting a signature sequence corresponding to the transmission mode of a transmitting device (S210); forming, for each antenna in the transmitting device, a synchronization field based on the selected signature sequence, wherein the synchronization field is included in a preamble (S220); and transmitting, from each antenna in the transmitting device, the data frame that comprises the preamble.

Claims

1. A method (200) for signaling a transmission mode in a wireless communication network, comprising:

selecting a signature sequence corresponding to the transmission mode (S210);

forming, for each antenna in the transmitting device, a synchronization field based on the selected signature sequence, wherein the synchronization field is included in a preamble (S220); and

transmitting, from each antenna in the transmitting device, a data frame that comprises the preamble.

2. The method of claim 1, wherein the signature sequence is further indicative of a transmission scheme of the transmitting device.

3. The method of claim 2, further comprising generating a long training sequence for a channel estimation field that is included in the preamble (S230).

4. The method of claim 3, wherein the data frame further includes a header and a payload portion, the data frame being a physical layer convergence protocol (PLCP) frame.

5. The method of claim 1, wherein forming the synchronization field further comprises generating a short training sequence by repeating the selected signature sequence a predefined number of times.

6. The method of claim 5, further comprising multiplying the selected signature sequence with a cover sequence.

7. The method of claim 5, wherein the signature sequence is a pseudo-random sequence.

8. The method of claim 2, wherein the transmission mode is a single antenna transmission or a multiple antennas transmission.

9. The method of claim 2, wherein the transmission scheme is any one of beam forming transmit diversity, frequency interleaved transmit diversity (FITD), spatial multiplexing, and space time block code (STBC).

10. The method of claim 1, further comprising forming, for each antenna in the transmitting device, a header for designating a transmission scheme of the transmitting device.

11. The method of claim 10, further comprising encoding the header using a FITD process.

12. An apparatus (500), comprising:

a memory (510) for storing at least one signature sequence corresponding to a transmission mode and a transmission scheme;

a synchronization field generator (520) for forming a synchronization field for each antenna (560) included in the apparatus by generating a short training sequence using the at least one signature sequence retrieved from the memory;

a channel estimation (CE) field generator for forming a CE field for each antenna by generating a long training sequence, wherein the synchronization field and CE field are included in a preamble;

a frame generator (540) for generating a data frame for each antenna (560), the data frame comprising the preamble; and

a modulator (550) for modulating each data frame using the transmission scheme set for the apparatus.

13. The apparatus of claim 12, further comprising a feedback loop shift register for generating the signature sequences.

14. The apparatus of claim 12, wherein the apparatus is integrated in a physical layer module of a wireless communication device.