CDMA radio multiplex transmitting device and CDMA radio multiplex receiving device
AssigneeMatsuhita Electric Industrial Co., Ltd.
InventorKazuyuki Miya
Life of this patent
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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.
Claims25
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.
A CDMA transmission method comprising:
- separating transmitting data into a plurality of data;
- spreading each of the separated data with a first spreading code;
- spreading a pilot symbol with a second spreading code;
- and
- multiplexing the spread pilot signal and the spread transmitting data so that only the spread pilot symbol 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 a respective spreading code 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 a said spreading code;
- separating and extracting the pilot symbol from the despread signal;
- estimating a transfer function of a channel from the extracted pilot symbol;
- detecting the despread signal by coherent detection;
- and
- combining the detected signals.
A CDMA reception method comprising:
- receiving a pilot signal that is spread with a spreading code different from another spreading code used for spreading transmitting data;
- despreading the spread pilot signal;
- and
- estimating a channel using the despread pilot signal.
Dependencies are inferred from the claim text.