Wireless Transmission System and Wireless Transmission Method and Wireless Station and Transmitting Station for Use Therein

A wireless station for use in a wireless transmission system in which a plurality of wireless stations each transmit a signal to a receiving station, wherein a path diversity system is formed by a transmitter-side wireless station, a multi-path channel and the receiving station, the wireless station comprising:

• a transmission timing control section for determining a transmission start timing, at which to start the signal transmission, to be a timing obtained by delaying a reference timing to be a reference for the signal transmission by a predetermined delay amount;
• and
• a transmitting section for transmitting the signal at the transmission start timing determined by the transmission timing control section,
• wherein the predetermined delay amount is determined so that:
• signals are received by the receiver side at a plurality of signal-receiving timings;
• the number of signal-receiving timings is less than or equal to a predetermined maximum number of effective branches;
• a difference between the signal-receiving timings is greater than or equal to a predetermined delay resolution;
• and a difference between a maximum value and a minimum value of the signal-receiving timing is less than or equal to a predetermined maximum delay.

A transmitting station for use in a wireless transmission system for transmitting a signal to a receiving station via a plurality of wireless stations, wherein a path diversity system is formed by a transmitter-side wireless station, a multi-path channel and the receiving station, the transmitting station comprising:

• a delay amount selecting section for selecting, from among a plurality of predetermined delay amounts, a delay amount to be given to a signal transmitted to each wireless station;
• a transmission timing control section for determining a transmission start timing, at which to start the signal transmission, to be a timing obtained by delaying a reference timing to be a reference for the signal transmission by the delay amount selected by the delay amount selecting section;
• and
• a transmitting section for transmitting the signal to the wireless station at the transmission start timing,
• wherein the predetermined delay amount is determined so that:
• signals are received by the receiver side at a plurality of signal-receiving timings;
• the number of signal-receiving timings is less than or equal to a predetermined maximum number of effective branches;
• a difference between the signal-receiving timings is greater than or equal to a predetermined delay resolution;
• and a difference between a maximum value and a minimum value of the signal-receiving timing is less than or equal to a predetermined maximum delay.

A method for use in a wireless transmission system, in which a plurality of wireless stations each transmit a signal to a receiving station, for transmitting a signal to the receiving station, wherein a path diversity system is formed by a transmitter-side wireless station, a multi-path channel and the receiving station, the method comprising the steps of:

• determining a transmission start timing, at which to start the signal transmission, to be a timing obtained by delaying a reference timing to be a reference for the signal transmission by a predetermined delay amount;
• transmitting the signal at the transmission start timing determined in the step of determining the transmission start timing;
• and
• receiving the transmitted signal at the receiving station,
• wherein the predetermined delay amount is determined so that:
• signals are received at the receiving station at a plurality of signal-receiving timings;
• the number of signal-receiving timings is less than or equal to a predetermined maximum number of effective branches;
• a difference between the signal-receiving timings is greater than or equal to a predetermined delay resolution;
• and a difference between a maximum value and a minimum value of the signal-receiving timing is less than or equal to a predetermined maximum delay.

A method for use in a wireless transmission system, in which a plurality of wireless stations each transmit a signal to a receiving station, for transmitting a signal from each wireless station, wherein a path diversity system is formed by a transmitter-side wireless station, a multi-path channel and the receiving station, the method comprising the steps of:

• determining a transmission start timing, at which to start the signal transmission, to be a timing obtained by delaying a reference timing to be a reference for the signal transmission by a predetermined delay amount;
• and
• transmitting the signal at the transmission start timing determined in the step of determining the transmission start timing,
• wherein the predetermined delay amount is determined so that:
• signals are received by the receiver side at a plurality of signal-receiving timings;
• the number of signal-receiving timings is less than or equal to a predetermined maximum number of effective branches;
• a difference between the signal-receiving timings is greater than or equal to a predetermined delay resolution;
• and a difference between a maximum value and a minimum value of the signal-receiving timing is less than or equal to a predetermined maximum delay.

A method for transmitting a signal from a transmitting station to a receiving station via a plurality of wireless stations, wherein a path diversity system is formed by a transmitter-side wireless station, a multi-path channel and the receiving station, the method comprising the steps of:

• selecting, from among a plurality of predetermined delay amounts, a delay amount to be given to a signal transmitted to each wireless station;
• determining a transmission start timing, at which to start the signal transmission, to be a timing obtained by delaying a reference timing to be a reference for the signal transmission by the delay amount selected in the step of selecting a delay amount;
• and
• transmitting the signal to the wireless station at the transmission start timing,
• wherein the predetermined delay amount is determined so that:
• signals are received by the receiver side at a plurality of signal-receiving timings;
• the number of signal-receiving timings is less than or equal to a predetermined maximum number of effective branches;
• a difference between the signal-receiving timings is greater than or equal to a predetermined delay resolution;
• and a difference between a maximum value and a minimum value of the signal-receiving timing is less than or equal to a predetermined maximum delay.