Radio apparatus and communication system utilizing the same

• US 20070081602A1
• Filed: 09/19/2006
• Published: 04/12/2007
• Est. Priority Date: 09/19/2005
• Status: Active Grant

• Current Assignee: Hera Wireless S.A. (Fineur International S.A.)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Tanaka, Yasuhiro, Nakao, Seigo
• Granted Patent: US 8,351,463 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 12/28 characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks] wireless communication networks H04W ; arrangements for dividing the transmission path H04W40/00
• CPC Class Codes: H04L 2025/03426 transmission using multiple-input and multiple-output channels
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2603 Signal structure ensuring backward compatibility with legacy system
• CPC Class Codes: H04L 27/261 Details of reference signals
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/023 Multiplexing of multicarrier modulation signals multicarrier modulation H04L27/2601

Abstract

In a combination of control signals on data signals and the data signals where the combination contains data signals to be assigned respectively to a plurality of streams, a control unit assigns a control signal contained in a leading combination and assigns a data signal, contained in the leading combination, to a position posterior to the assigned control signal. The control unit appends a known signal to at least one of the remaining combinations and then assigns sequentially the remaining combinations to a position posterior to the assigned data signal so as to generate packet signals.

Claims

1. A radio apparatus for transmitting a packet signal composed of a plurality of streams, the apparatus comprising:

an input unit which inputs a plurality of combinations of control signal on a data signal and said data signal wherein the combination contains data signals which are to be assigned respectively to a plurality of streams;

a generation unit which generates a packet signal in a manner such that a data signal contained in a leading combination among the plurality of combinations inputted by said input unit is assigned posterior to a known signal, a data signal contained in the leading combination is assigned posterior to said control signal, then a known signal is appended to at least one of the remaining combinations and then the remaining combinations are sequentially assigned posterior to said data signal; and

a transmitter which transmits the packet signal generated by said generation unit.

2. A radio apparatus according to claim 1, wherein while using as a reference a first known signal assigned to one of a plurality of streams and applying a cyclic timing shift within the known signal to a known signal assigned to another stream, said generation unit applies also a timing shift to the control signal, and sets an amount of timing shift in a manner that the amount of timing shift for the control signal is identical to a value of that for the known signal.

3. A radio apparatus for transmitting a packet signal composed of a plurality of streams, the apparatus comprising:

an input unit which inputs a plurality of combinations of control signal on a data signal and said data signal wherein the combination contains data signals which are to be assigned respectively to a plurality of streams;

a generation unit which generates a packet signal in a manner such that while a first known signal is being assigned anterior to a control signal contained in a leading combination among the plurality of combinations inputted by said input unit and a second known signal is being assigned posterior to said control signal, a data signal contained in the leading combination is assigned posterior to the second known signal, the second known signal is appended to at least one of the remaining combinations and then the remaining combinations are sequentially assigned, posterior to said data signal; and

a transmitter which transmits the packet signal generated by said generation unit.

4. A radio apparatus according to claim 3, wherein while using as a reference a first known signal assigned to one of a plurality of streams and applying a cyclic timing shift within the first known signal to a known signal assigned to another stream, said generation unit applies also a timing shift to the second known signal and the control signal, and wherein while setting an amount of timing shift to different values for the first known signal and the second known signal, said generation unit sets an amount of timing shift in a manner that an amount of timing shift for the control signal contained in the leading combination is equal to a value of that for the first known signal contained in the leading combination, and an amount of timing shift for a control signal contained in the remaining combinations is equal to a value of that for a second known signal contained in the remaining combinations.

5. A radio apparatus according to claim 3, further comprising a selector which selects either a first format or a second format and causes said generation unit to generate a packet signal of the selected format wherein the first format is such that while a first known signal is assigned anterior to a control signal, and a second known signal is assigned posterior to said control signal, and the second format is such that a control signal is assigned posterior to a second known signal and a data signal is assigned posterior to said control signal,

wherein, among the plurality of combinations inputted by said input unit, said selector selects the first format when said selector has said generation unit generate a packet signal of the leading combination, and said selector selects the second format when said selector has said generation unit generate a packet signal of the remaining combinations.

6. A radio apparatus according to claim 3, wherein said generation unit applies also a cyclic timing shift to a data signal, and sets an amount of timing shift to different values for a control signal and a data signal contained in the leading combination and sets an amount of timing shift in a manner that an amount of timing shift for control signals contained in the remaining combination is equal to that for data signals contained in the remaining combinations.

7. A radio apparatus according to claim 3, wherein said generation unit sets an amount of timing shift in a manner that the absolute value of a timing shift amount for the control signal contained in the remaining combinations is greater than the absolute value of a timing shift amount for the control signal contained in the leading combination.

8. A communication system, comprising:

a transmitting apparatus which transmits a packet signal composed of a plurality of streams; and

a receiving apparatus which receives the packet signal transmitted from said transmitting apparatus,

said transmitting apparatus including;

an input unit which inputs a plurality of combinations of control signal on a data signal and said data signal wherein the combination contains data signals which are to be assigned respectively to a plurality of streams;

a generation unit which generates a packet signal in a manner such that a control signal contained in a leading combination among the plurality of combinations inputted by the input unit is assigned posterior to a known signal and a data signal contained in the leading combination is assigned posterior to said control signal, then a known signal is appended to at least one of the remaining combinations and, thereafter, the remaining combinations are sequentially assigned posterior to said data signal; and

a transmitter which transmits the packet signal generated by the generation unit.

9. A communication system, comprising:

a transmitting apparatus which transmits a packet signal composed of a plurality of streams; and

a receiving apparatus which receives the packet signal transmitted from said transmitting apparatus,

said transmitting apparatus including;

an input unit which inputs a plurality of combinations of control signal on a data signal and said data signal wherein the combination contains data signals which are to be assigned respectively to a plurality of streams;

a generation unit which generates a packet signal in a manner such that while a first known signal is being assigned anterior to a control signal contained in a leading combination among the plurality of combinations inputted by the input unit and a second known signal is being assigned posterior to said control signal, a data signal contained in the leading combination is assigned posterior to the second known signal and a second known signal is appended to at least one of the remaining combinations and then the remaining combinations are sequentially assigned posterior to said data; and

a transmitter which transmits the packet signal generated by the generation unit.