1. A method for transmitting a data stream in a wireless communication system, comprising:
converting the data stream to a symbol set;
selecting a first plurality of symbols from the symbol set, wherein the first plurality of symbols include at least a first symbol, a second symbol, a third symbol, a fourth symbol, a fifth symbol, a sixth symbol, a seventh symbol, and a eighth symbol;
generating a second plurality of symbols having at least a ninth symbol, a tenth symbol, an eleventh symbol, and a twelfth symbol, wherein the ninth symbol includes a first part of the first symbol and a second part of the third symbol, the tenth symbol includes an additive inverse of a first part of the second symbol and a second part of the fourth symbol, the eleventh symbol includes a first part of the fifth symbol and a second part of the seventh symbol, and the twelfth symbol includes an additive inverse of a first part of the sixth symbol and a second part of the eighth symbol;
weighting the eleventh symbol and the twelfth symbol to form a first weighted symbol and a second weighted symbol, respectively; and
transmitting in a first time slot the ninth symbol with a first antenna, the tenth symbol with a second antenna, the first weighted symbol with a third antenna, and the second weighted symbol with a fourth antenna.
2. The method of claim 1, further comprising:
generating a thirteenth symbol, a fourteenth symbol, a fifteenth symbol, and a sixteenth symbol, wherein the thirteenth symbol includes a first part of the second symbol and a second part of the fourth symbol, the fourteenth symbol includes a first part of the first symbol and an additive inverse of a second part of the third symbol, the fifteenth symbol includes a first part of the sixth symbol and a second part of the eighth symbol, and the sixteenth symbol includes a first part of the fifth symbol and an additive inverse of a second part of the seventh symbol;
weighting the fifteenth symbol and the sixteenth symbol to form a third weighted symbol and a fourth weighted symbol, respectively; and
transmitting in a second time slot the thirteenth symbol with the first antenna, the fourteenth symbol with the second antenna, the third weighted symbol with the third antenna, and the fourth weighted symbol with the fourth antenna.
3. The method of claim 1, further comprising:
generating a thirteenth symbol, a fourteenth symbol, a fifteenth symbol, and a sixteenth symbol, wherein the thirteenth symbol includes a first part of the seventh symbol and a second part of the fifth symbol, the fourteen symbol includes an additive inverse of a first part of the eighth symbol and a second part of the sixth symbol, the fifteenth symbol includes a first part of the third symbol and a second part of the first symbol, and the sixteenth symbol includes an additive inverse of a first part of the fourth symbol and a second part of the second symbol;
weighting the thirteenth symbol and the fourteenth symbol to form a third weighted symbol and a fourth weighted symbol, respectively; and
transmitting in a second time slot the third weighted symbol with the first antenna, the fourth weighted symbol with the second antenna, the fifteenth symbol with the third antenna, and the sixteenth symbol with the fourth antenna.
4. The method of claim 1, further comprising:
generating a thirteenth symbol, a fourteenth symbol, a fifteenth symbol, and a sixteenth symbol, wherein the thirteenth symbol includes a first part of the eighth symbol and a second part of the sixth symbol, the fourteen symbol includes a first part of the seventh symbol and an additive inverse of a second part of the fifth symbol, the fifteenth symbol includes a first part of the fourth symbol and a second part of the second symbol, and the sixteenth symbol includes a first part of the third symbol and an additive inverse of a second part of the first symbol;
weighting the thirteenth symbol and the fourteenth symbol to form a third weighted symbol and a fourth weighted symbol, respectively; and
transmitting in a second time slot the third weighted symbol with the first antenna, the fourth weighted symbol with the second antenna, the fifteenth symbol with the third antenna, and the sixteenth symbol with the fourth antenna.
5. The method of claim 1, wherein the first part of each symbol of the first plurality of symbols is different from each other.
6. The method of claim 1, wherein the second part of each symbol of the first plurality of symbols is different from each other.
7. The method of claim 1, wherein the first part of the first symbol is the same as the first part of the second, the third, the fourth, the fifth, the sixth, the seventh, or the eighth symbol.
8. The method of claim 1, wherein the second part of the first symbol is the same as the second part of the second, the third, the fourth, the fifth, the sixth, the seventh, or the eighth symbol.
9. The method of claim 1, wherein the magnitude of the first part of any of the first plurality of symbols and the second plurality of symbols is an in-phase component and the magnitude of the second part of any of the first plurality of symbols and the second plurality of symbols is a quadrature-phase component.
10. The method of claim 1, wherein a weight applied in the weighting step is ej\u03b8, wherein \u03b8 is in a range from zero to around \u03c02.
11. A wireless communication system, comprises:
a transmitter having a first transmit antenna, a second transmit antenna, a third transmit antenna, and a fourth transmit antenna configured to
convert a data stream to a symbol set;
select a first plurality of symbols from the symbol set, wherein the first plurality of symbols include at least a first symbol, a second symbol, a third symbol, a fourth symbol, a fifth symbol, a sixth symbol, a seventh symbol, and a eighth symbol;
generate a second plurality of symbols having at least a ninth symbol, a tenth symbol, an eleventh symbol, and a twelfth symbol, wherein the ninth symbol includes a first part of the first symbol and a second part of the third symbol, the tenth symbol includes an additive inverse of a first part of the second symbol and a second part of the fourth symbol, the eleventh symbol includes a first part of the fifth symbol and a second part of the seventh symbol, and the twelfth symbol includes an additive inverse of a first part of the sixth symbol and a second part of the eighth symbol;
weight the eleventh symbol and the twelfth symbol to form a first weighted symbol and a second weighted symbol, respectively; and
transmit in a first time slot the ninth symbol with the first antenna, the tenth symbol with the second antenna, the first weighted symbol with the third antenna and the second weighted symbol with the fourth antenna.
12. The wireless communication system of claim 11, wherein the wireless communication system is a multiple input and multiple output (MIMO) system.
13. The wireless communication system of claim 12, wherein the MIMO system comprises four transmit antennas at the transmitter and another two antennas at a receiver.
14. The wireless communication system of claim 11, wherein the transmitter is further configured to
generate a thirteenth symbol, a fourteenth symbol, a fifteenth symbol, and a sixteenth symbol, wherein the thirteenth symbol includes a first part of the second symbol and a second part of the fourth symbol, the fourteenth symbol includes a first part of the first symbol and an additive inverse of a second part of the third symbol, the fifteenth symbol includes a first part of the sixth symbol and a second part of the eighth symbol, and the sixteenth symbol includes a first part of the fifth symbol and an additive inverse of a second part of the seventh symbol;
weight the fifteenth symbol and the sixteenth symbol to form a third weighted symbol and a fourth weighted symbol, respectively; and
transmit in a second time slot the thirteenth symbol with the first antenna, the fourteenth symbol with the second antenna, the third weighted symbol with the third antenna and the fourth weighted symbol with the fourth antenna.
15. The wireless communication system of claim 11, wherein the transmitter is further configured to
generate a thirteenth symbol, a fourteenth symbol, a fifteenth symbol, and a sixteenth symbol, wherein the thirteenth symbol includes a first part of the seventh symbol and a second part of the fifth symbol, the fourteen symbol includes an additive inverse of a first part of the eighth symbol and a second part of the sixth symbol, the fifteenth symbol includes a first part of the third symbol and a second part of the first symbol, and the sixteenth symbol includes an additive inverse of a first part of the fourth symbol and a second part of the second symbol;
weight the thirteenth symbol and the fourteenth symbol to form a third weighted symbol and a fourth weighted symbol, respectively; and
transmit in a second time slot the third weighted symbol with the first antenna, the fourth weighted symbol with the second antenna, the fifteenth symbol with the third antenna, and the sixteenth symbol with the fourth antenna.
16. The wireless communication system of claim 11, wherein the transmitter is further configured to
generate a thirteenth symbol, a fourteenth symbol, a fifteenth symbol, and a sixteenth symbol, wherein the thirteenth symbol includes a first part of the eighth symbol and a second part of the sixth symbol, the fourteen symbol includes a first part of the seventh symbol and an additive inverse of a second part of the fifth symbol, the fifteenth symbol includes a first part of the fourth symbol and a second part of the second symbol, and the sixteenth symbol includes a first part of the third symbol and an additive inverse of a second part of the first symbol;
weight the thirteenth symbol and the fourteenth symbol to form a third weighted symbol and a fourth weighted symbol, respectively; and
transmit in a second time slot the third weighted symbol with the first antenna, the fourth weighted symbol with the second antenna, the fifteenth symbol with the third antenna, and the sixteenth symbol with the fourth antenna.
17. The wireless communication system of claim 11, wherein a weight applied to the eleventh symbol and the twelfth symbol is ej\u03b8, wherein \u03b8 is in a range from zero to around \u03c02.
18. The wireless communication system of claim 11, wherein the magnitude of the first part of any of the first plurality of symbols and the second plurality of symbols is an in-phase component and the magnitude of the second part of any of the first plurality of symbols and the second plurality of symbols is a quadrature-phase component.
19. A non-transitory computer-readable medium containing a sequence of instructions, which when executed by a computing device, causes the computing device to:
convert a data stream to a symbol set;
select a first plurality of symbols from the symbol set, wherein the first plurality of symbols include at least a first symbol, a second symbol, a third symbol, a fourth symbol, a fifth symbol, a sixth symbol, a seventh symbol, and a eighth symbol;
generate a second plurality of symbols having at least a ninth symbol, a tenth symbol, an eleventh symbol, and a twelfth symbol, wherein the ninth symbol includes a first part of the first symbol and a second part of the third symbol, the tenth symbol includes an additive inverse of a first part of the second symbol and a second part of the fourth symbol, the eleventh symbol includes a first part of the fifth symbol and a second part of the seventh symbol, and the twelfth symbol includes an additive inverse of a first part of the sixth symbol and a second part of the eighth symbol;
weight the eleventh symbol and the twelfth symbol to form a first weighted symbol and a second weighted symbol, respectively; and
transmit in a first time slot the ninth symbol with a first antenna, the tenth symbol with a second antenna, the first weighted symbol with a third antenna and the second weighted symbol with a fourth antenna.
20. The non-transitory computer-readable medium of claim 19, wherein a weight applied to the eleventh symbol and the twelfth symbol is ej\u03b8, wherein \u03b8 is in a range from zero to around \u03c02.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A thermal printer that prints onto a recording medium having a print area where copying is unnecessary and a print area where copying is necessary on one page, comprising:
a thermal head; and
thermal head driving means for driving the thermal head so as to decrease the energy supplied to the thermal head for the print area where copying is unnecessary below that for the print area where copying is necessary.
2. A thermal printer that prints onto a recording medium having a print area where copying is unnecessary and a print area where copying is necessary on one page, comprising:
transport means for transporting the recording medium; and
printing speed control means for controlling the transport means so as to increase the printing speed for the print area where copying is unnecessary above that for the print area where copying is necessary.
3. A thermal printer that prints onto a recording medium having a page where copying is unnecessary and a page where copying is necessary, comprising:
transport means for transporting the recording medium; and
printing speed control means for controlling the transport means so as to increase the printing speed for the page where copying is unnecessary above that for the page where copying is necessary.
4. The thermal printer according to claim 1, wherein the area where copying is unnecessary and the area where copying is necessary are set up from a personal computer.
5. The thermal printer according to claim 2, wherein the area where copying is unnecessary and the area where copying is necessary are set up from a personal computer.
6. A thermal printer that prints onto a recording medium having a print area where copying is unnecessary and a print area where copying is necessary on one page, comprising:
a thermal head; and
thermal head driving means for driving the thermal head so as to decrease the applied energy to the thermal head for a section in the direction in which the recording medium is transported in the print area where copying is unnecessary below that for a section in the direction in which the recording medium is transported in the print area where copying is necessary.
7. A thermal printer that prints onto a recording medium having a print area where copying is unnecessary and a print area where copying is necessary on one page, comprising:
a thermal head;
determination means for making a determination of whether or not a print page is the second page or later;
setting means for, when the determination means determines that the print page is the second page or later, setting that page as an area where copying is unnecessary; and
thermal head driving means for driving the thermal head so as to decrease the applied energy to the thermal head for the print area where copying is unnecessary below that for the print area where copying is necessary.
8. A thermal printer that prints onto a recording medium having a print area where copying is unnecessary and a print area where copying is necessary on one page, comprising:
transport means for transporting the recording medium;
determination means for determining whether or not a print page is the second page or later;
setting means for, when the determination means determines that the print page is the second page or later, setting that page as an area where copying is unnecessary; and
printing speed control means for controlling the transport means so as to increase the printing speed for the print area where copying is unnecessary above that for the print area where copying is necessary.
9. A thermal printer that prints onto a recording medium having a page where copying is unnecessary and a page where copying is necessary, comprising:
transport means for transporting the recording medium;
determination means for determining whether or not a page needs copying on the basis of a lot of parcels; and
printing speed control means for controlling the transporting means so as to increase the printing speed for the page for which the determination is that copying is unnecessary above that for the page that needs copying.
10. A thermal printer that prints onto a recording medium having a page where copying is unnecessary and a page where copying is necessary, comprising:
a thermal head;
transport means for transporting the recording medium;
determination means for determining whether or not a page needs copying on the basis of a lot of parcels; and
printing control means for driving the thermal head and controlling the transporting means so that the applied energy and the printing speed for the page for which copying is determined unnecessary are respectively decreased and increased below and above the applied energy and the printing speed for the page that needs copying.
11. The thermal printer according to claim 1, wherein, when it is determined that printing extends over more than one page, the second page and later are set to an area where copying is unnecessary.
12. The thermal printer according to claim 2, wherein, when it is determined that printing extends over more than one page, the second pager and later are set to an area where copying is unnecessary.
13. A thermal printer that prints onto a recording medium having a print area where copying is unnecessary and a print area where copying is necessary on one page, comprising:
a thermal head;
transport means for transporting the recording medium; and
printing control means for driving the thermal head and controlling the transporting means so that the applied energy and the printing speed for the print area where copying is unnecessary are respectively decreased and increased below and above the applied energy and the printing speed for the print area where copying is necessary.
14. The thermal printer according to claim 1, wherein the recording medium is a delivery slip.
15. The thermal printer according to claim 2, wherein the recording medium is a delivery slip.
16. A thermal printer that prints onto a recording medium having a print area where copying is unnecessary and a print area where copying is necessary on one page, comprising:
a thermal head; and
thermal head driving means for driving the thermal head so as to increase the applied energy to the thermal head for the print area where copying is necessary above that for the print area where copying is unnecessary.
17. A thermal printer that prints onto a recording medium having a print area where copying is unnecessary and a print area where copying is necessary on one page, comprising:
transport means for transporting the recording medium; and
printing speed control means for controlling the transport means so as to decrease the printing speed for the print area where copying is necessary below that for the print area where copying is unnecessary.
18. A method for driving a thermal printer that prints onto a recording medium having a print area where copying is unnecessary and a print area where copying is necessary on one page, comprising:
a thermal head driving step of driving the thermal head so as to decrease the applied energy to the thermal head for the print area where copying is unnecessary below that for the print area where copying is necessary.
19. The method according to claim 18, wherein the print area where copying is unnecessary is printed prior to the print area where copying is necessary.
20. A method for driving a thermal printer that prints onto a recording medium having a print area where copying is unnecessary and a print area where copying is necessary on one page, comprising:
a printing speed control step of controlling transport means for transporting the recording medium so as to increase the printing speed for the print area where copying is unnecessary above that for the print area where copying is necessary.