Channel spreading device and method for CDMA communication system
AssigneeSamsung Electronics Co., Ltd.
InventorsJae-Yoel Kim, Young-Ky Kim, Hee-Won Kang, Seung-Joo Maeng
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Abstract
A channel spreading device for a base station in a CDMA communication system is described. The device comprises a spreading code generator for generating a real-component spreading code and an imaginary-component spreading code corresponding to a designated channel spreading code index; a circuit receiving a mode control signal, for disabling generation of the imaginary-component spreading code when the received mode control signal indicates a BPSK (Binary Phase Shift Keying) modulation mode; and a complex multiplier receiving a channel signal, for complex multiplying the received channel signal by the spreading codes to spread the channel signal.
Claims13
A channel spreading device for a base station in a CDMA (Code Division Multiple Access) communication system, comprising:
- a spreading code generator for generating a real-component spreading code and an imaginary-component spreading code corresponding to a designated channel spreading code index;
- a circuit receiving a mode control signal, for disabling generation of the imaginary-component spreading code in a QPSK modulation mode when the received mode control signal indicates a BPSK (Binary Phase Shift Keying) modulation mode;
- and
- a complex multiplier receiving a channel signal, for complex multiplying the received channel signal by at least one spreading code to spread the channel signal.
A channel despreading device for a mobile station in a CDMA communication system, comprising:
- a spreading code generator for generating a real-component spreading code and an imaginary-component spreading code corresponding to a designated channel spreading code index;
- a circuit receiving a mode control signal, for disabling generation of the imaginary-component spreading code in a QPSK modulation mode when the received mode control signal indicates a BPSK (Binary Phase Shift Keying) modulation mode;
- and
- a complex multiplier receiving a channel signal, for complex multiplying the received channel signal by the spreading codes to despread the channel signal.
A channel transmission device for a base station in a CDMA communication system, comprising:
- a demultiplexer receiving a mode control signal as a select signal, for outputting input channel symbols to one path when the received mode control signal is a BPSK (Binary Phase Shift Keying) mode control signal, and for separately outputting the input channel symbols to said one path and another path when the received mode control signal is a QPSK (Quadrature Phase Shift Keying) mode control signal;
- a channel spreader including:
- a spreading code generator for generating a real-component spreading code and an imaginary-component spreading code corresponding to a designated channel spreading code index;
- a circuit receiving a mode control signal, for disabling generation of the imaginary-component spreading code in a QPSK modulation mode when the received mode control signal indicates the BPSK mode;
- and
- a complex multiplier receiving a channel signal, for complex multiplying the received channel signal by at least one spreading code to spread the channel signal;
- and
- a spreader for complex multiplying the channel spread signal by a real-component and an imaginary-component PN (Pseudo Noise) codes.
A channel receiving device for a mobile station in a CDMA communication system, comprising:
- a despreader receiving a channel signal transmitted from a base station, for complex multiplying the received channel signal by real-component and imaginary-component PN (Pseudo Noise) codes;
- a channel despreader including:
- a spreading code generator for generating a real-component spreading code and an imaginary-component spreading code corresponding to a designated channel spreading code index;
- a circuit receiving a mode control signal, for disabling generation of the imaginary-component spreading code in a QPSK modulation mode when the received mode control signal indicates a BPSK (Binary Phase Shift Keying) modulation mode;
- and
- a complex multiplier receiving the despread signal, for complex multiplying the received signal by at least one spreading code to despread the received signal;
- and
- a multiplexer receiving a mode control signal as a select signal, for multiplexing the received channel symbols on one path and another path when the received mode control signal is a QPSK (Quadrature Phase Shift Keying) mode control signal.
A channel spreading method for a base station in a CDMA communication system having a spreading code generator for generating real-component and imaginary-component spreading codes, comprising the steps of:
- upon generation of a BPSK (Binary Phase Shift Keying) mode control signal, disabling generation of the imaginary-component spreading code in a QPSK modulation mode and multiplying a channel signal to be transmitted by the real-component spreading code to spread the channel signal;
- and
- upon generation of a QPSK (Quadrature Phase Shift Keying) mode control signal, complex multiplying the channel signal to be transmitted by the real-component spreading code and the imaginary-component spreading code to spread the channel signal.
A channel despreading method for a mobile station in a CDMA communication system having a spreading code generator for generating real-component and imaginary-component spreading codes, comprising the steps of:
- upon generation of a BPSK (Binary Phase Shift Keying) mode control signal, disabling generation of the imaginary-component spreading code in a QPSK modulation mode and multiplying a received channel signal by the real-component spreading code to despread the channel signal;
- and
- upon generation of a QPSK (Quadrature Phase Shift Keying) mode control signal, complex multiplying the received channel signal by the real-component spreading code and the imaginary-component spreading code to despread the channel signal.
A channel transmission method for a base station in a CDMA communication system having a spreading code generator for generating real-component and imaginary-component spreading codes, comprising the steps of:
- receiving a mode control signal as a select signal, outputting input channel symbols to one path when the received mode control signal is a BPSK (Binary Phase Shift Keying) mode control signal, and separately outputting the input channel symbols to said one path and another path when the received mode control signal is a QPSK (Quadrature Phase Shift Keying) mode control signal;
- upon generation of the BPSK mode control signal, disabling generation of the imaginary-component spreading code in a QPSK modulation mode and multiplying the received channel signal by the real-component spreading code to spread the channel signal;
- upon generation of the QPSK mode control signal, complex multiplying the received channel signal by the real-component and imaginary component spreading codes to spread the channel signal;
- and
- complex multiplying the spread channel signal by real-component and imaginary-component PN (Pseudo Noise) codes to spread the channel signal.
A channel receiving method for a mobile station in a CDMA communication system having a spreading code generator for generating real-component and imaginary-component spreading codes, comprising the steps of:
- receiving a channel signal transmitted from a base station and complex multiplying the received signal by real-component and imaginary-component PN codes to despread the received signal;
- upon generation of a BPSK (Binary Phase Shift Keying) mode control signal, disabling generation of the imaginary-component spreading code in a QPSK modulation mode and multiplying the received channel signal by the real-component spreading code to despread the channel signal;
- upon generation of a QPSK (Quadrature Phase Shift Keying) mode control signal, complex multiplying the received channel signal by the real-component and imaginary component spreading codes to despread the channel signal;
- and
- receiving a mode control signal as a select signal, and multiplexing the input channel symbols on one path and another path when the received mode control signal is the QPSK mode control signal.
Dependencies are inferred from the claim text.