CDMA radio multiplex transmitting device and a CDMA multiplex receiving device
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorKazuyuki Miya
Life of this patent
Estimating the term…
Abstract
In the CDMA Radio Multiplex Tansmission, transfer function of line is inferred by using common pilot signal and sychronous detection is performed accordingly. The transmitting end transmits by periodically inserting pilot symbols into one channel only of multiplexed channels. The receiving end infers line condition (transfer function) from the received pilot symbols and, on the basis of the information thus obtained, performs synchronous detection of each channel multiplexed.
Claims20
A CDMA transmission method comprising:
- separating transmitting data into a plurality of channels;
- periodically inserting a pilot symbol into a pilot symbol channel, the pilot symbol channel not included in the plurality of channels;
- spreading a signal having a different spreading code to each channel of the plurality of channels and to the pilot symbol channel;
- multiplexing signals of the plurality of channels;
- and
- transmitting the multiplexed signals and the pilot symbol in accordance with time division multiplexing.
A CDMA transmission method comprising:
- separating transmitting data into a plurality of data;
- spreading each of the separated transmitting data with respective first spreading codes;
- spreading a pilot symbol with a second spreading code;
- and
- multiplexing the spread pilot symbol and the spread transmitting data so that only the spread pilot symbol is transmitted at predetermined periods,
- wherein the transmitting data is divided into control data and information data, and said multiplexing comprises multiplexing the transmitting data so that only the control data is transmitted at predetermined periods.
A CDMA communication method comprising:
- on a transmitting side:
- separating transmitting data into a plurality of channels;
- periodically inserting a pilot symbol into a pilot symbol channel, the pilot symbol channel not included in the plurality of channels;
- spreading a signal with respective spreading codes for the pilot symbol channel and each channel of the plurality of channels;
- multiplexing each signal in the plurality of channels;
- and
- transmitting the multiplexed signals and the pilot symbol;
- and
- on a receiving side:
- receiving a radio signal;
- despreading the received radio signal in accordance with said respective spreading codes;
- separating and extracting the pilot symbol from the despread signal;
- estimating a condition of a channel from the extracted pilot symbol;
- detecting the despread signal by coherent detection;
- and
- combining the detected signals.
A CDMA reception method for receiving a radio signal transmitted by a CDMA transmission method comprising separating transmitting data into a plurality of channels, periodically inserting a pilot symbol into a pilot symbol channel, the pilot symbol channel not included in the plurality of channels, spreading a signal having a different spreading code to each channel of the plurality of channels and to the pilot symbol channel, multiplexing signals of the plurality of channels, and transmitting the multiplexed signals and the pilot symbol in accordance with time division multiplexing, the CDMA reception method comprising:
- receiving the radio signal;
- despreading the received signal in accordance with respective spreading codes;
- separating and extracting the pilot symbol from the despread signal;
- estimating a condition of a channel from the extracted pilot symbol;
- detecting the despread signal by coherent detection;
- and
- combining the detected signals.
A CDMA reception method, for receiving a radio signal transmitted by a CDMA transmission method comprising:
- separating a radio signal into a plurality of channel, periodically inserting a pilot symbol into a pilot symbol channel, the pilot symbol channel not included in the plurality of channels, spreading a signal having a different spreading code to each channel of the plurality of channels and to the pilot symbol channel, multiplexing signals of the plurality of channels, and transmitting the multiplexed signals and the pilot symbol in accordance with time division multiplexing;
- the CDMA reception method comprising:
- receiving the radio signal;
- and
- performing RAKE combining,
- wherein the RAKE combining is performed while estimating a condition of a channel from the pilot symbol.
A CDMA reception method for receiving a radio signal transmitted by a CDMA transmission method comprising:
- separating transmitting data into a plurality of channels, periodically inserting a pilot symbol into a pilot symbol channel, the pilot symbol channel not included in the plurality of channels, spreading a signal having a different spreading code to each channel of the plurality of channels and to the pilot symbol channel, multiplexing signals of the plurality of channels, and transmitting the multiplexed signals and the pilot symbol in accordance with time division multiplexing;
- the CDMA reception method comprising:
- receiving the radio signal;
- and
- estimating at least one of communication quality and condition of a channel by obtaining one of the reception power and the SINR (Signal to Interference-plus-Noise Ratio ) from the pilot symbol.
A CDMA reception method for receiving a pilot symbol transmitted by a CDMA transmission method comprising separating transmitting data into a plurality of data, spreading each of the separated transmitting data with respective first spreading codes, spreading a pilot symbol with a second spreading code;
- multiplexing the spread pilot symbol and the spread transmitting data so that only the spread pilot symbol is transmitted at predetermined periods, the transmitting data is divided into control data and information data, and said multiplexing comprises multiplexing the transmitting data so that only the control data is transmitted at predetermined periods, the CDMA reception method comprising:
- receiving the pilot symbol that is spread with a spreading code different from another spreading code used for spreading transmitting data;
- despreading the spread pilot symbol;
- and
- estimating a channel using the despread pilot symbol.
Dependencies are inferred from the claim text.