US6404802B1
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US
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Flexible binary phase shift keying/quadrature phase shift keying modulator of wideband code division multiple access system
Assignee: Samsung Electronics Co Ltd
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Filing: 1999-09-15
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Granted: 2002-06-11
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Expires: 2019-09-15
Abstract
Abstract A flexible BPSK (binary phase shift keying)/QPSK (quadrature phase shift keying) modulator of the wideband code division multiple access system. The flexible modulator includes a first link selecting unit for selecting a modulating type after receiving a signal of a reverse channel, alternately, an I (In-phase) signal and Q (quadrature) signal of a forward channel for which a spread modulation is to execute, a Hadamard spreading unit permits Hadamard code spreading modulation after receiving the I and Q signals from the first link selecting unit, and a spreading means for executing a spread modulation for a pseudo-noise (PN) code of the exchanged I and Q signals. The present invention can reduce the amount of hardware required by controlling a similar parts of the channel in a wideband code division multiple access system, especially a BPSK/QPSK modulation parts, by an external register and a flexible channel structure for joint control between channels. A reduced number of gates, and reduced power consumption, as well as reliability can be increased by the flexible modulator.
Inventors
- 👤 Se-jin Kang
- 👤 Sung-soo Dong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:43
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/02; H04B1/04; H04L; H04L27/00; H04L27/0008; H04L1/00; H04L1/0001; H04L1/0023; H04L1/0025; H04L1/004; H04L1/0041; H04L1/08
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
138 words
A flexible modulator for binary phase shift keying and quadrature phase shift keying in a wideband code division multiple access system, said modulator comprising: a first link selecting means for selecting a modulating type after receiving a signal of a reverse channel or an I (In-phase) signal and Q (quadrature) signal of a forward channel for which a spread modulation is to be executed; a Hadamard spreading means for a Hadamard code spreading modulation after receiving said I and Q signals from said first link selecting means; an exchanging means for exchanging signal paths of said I and Q signals spread by said Hadamard spreading means when an exchange for said forward signal is needed; and, a pseudo-noise (PN) spreading means for executing a spread modulation for a pseudo-noise (PN) code of said exchanged I and Q signals.
Claim 2
Dependent Claim
138 words
A flexible modulator for binary phase shift keying and quadrature phase shift keying in a wideband code division multiple access system, said modulator comprising: a first link selecting means for selecting a modulating type after receiving a signal of a reverse channel or an I (In-phase) signal and Q (quadrature) signal of a forward channel for which a spread modulation is to be executed; a Hadamard spreading means for a Hadamard code spreading modulation after receiving said I and Q signals from said first link selecting means; an exchanging means for exchanging signal paths of said I and Q signals spread by said Hadamard spreading means when an exchange for said forward signal is needed; and, a pseudo-noise (PN) spreading means for executing a spread modulation for a pseudo-noise (PN) code of said exchanged I and Q signals.
Claim 3
Dependent Claim
32 words
The flexible modulator as set forth in claim 1 , wherein said first link selecting means receives a signal to be spread out of a reverse pilot power control signaling (PPCS) channel.
Claim 4
Dependent Claim
34 words
The flexible modulator as set forth in claim 1 , wherein said first link selecting means receives said I and Q signals to be spread out of a forward power control signaling (PCS) channel.
Claim 5
Dependent Claim
115 words
The modulator as set forth in claim 1 , wherein said first link selecting means comprises: an I multiplexer for selecting a reverse I signal when a channel operating mode is a reverse channel mode and for selecting a forward Q signal when the channel operating mode is a forward channel mode; a Q multiplexer for selecting a reverse I signal when a channel operating mode is a reverse channel mode and for selecting a forward Q signal when the channel operating mode is a forward channel mode; and, a symbol repeater for executing a symbol iteration for said I signal received from said I multiplexer and said Q signal received from said Q multiplexer.
Claim 6
Dependent Claim
28 words
The modulator as set forth in claim 4 , wherein an iteration rule of said symbol repeater is determined by a channel bandwidth and a type of channel.
Claim 7
Dependent Claim
59 words
The modulator as set forth in claim 1 , wherein said Hadamard spreading means comprising: an I Hadamard spreader for spreading said reverse or said forward I signal by a first Hadamard code; and a Q Hadamard spreader for spreading said reverse Q signal by a second Hadamard code and said forward Q signal by said first Hadamard code.
Claim 8
Dependent Claim
61 words
The modulator as set forth in claim 1 , wherein the pseudo-noise (PN) code spreading means comprises: an I PN code spreader for spreading the reverse or forward I signals by a first PN code, and a Q PN spreader for spreading the reverse Q signal by said first PN code and the forward Q signal by a second PN code.
Claim 9
Dependent Claim
117 words
A flexible modulator for binary phase shift keying and quadrature phase shift keying in a wideband code division multiple access system, said modulator comprising: a first link selecting means for selecting a modulating type after receiving a signal of a reverse channel or an I (In-phase) signal and Q (quadrature) signal of a forward channel for which a spread modulation is to be executed; a Hadamard spreading means for a Hadamard code spreading modulation after receiving said I and Q signals from said first link selecting means; and, a pseudo-noise (PN) spreading means for executing a spread modulation for a pseudo-noise (PN) code of said I signal and said Q signal spread by said Hadamard spreading means.
Claim 10
Dependent Claim
117 words
A flexible modulator for binary phase shift keying and quadrature phase shift keying in a wideband code division multiple access system, said modulator comprising: a first link selecting means for selecting a modulating type after receiving a signal of a reverse channel or an I (In-phase) signal and Q (quadrature) signal of a forward channel for which a spread modulation is to be executed; a Hadamard spreading means for a Hadamard code spreading modulation after receiving said I and Q signals from said first link selecting means; and, a pseudo-noise (PN) spreading means for executing a spread modulation for a pseudo-noise (PN) code of said I signal and said Q signal spread by said Hadamard spreading means.
Claim 11
Dependent Claim
27 words
The modulator as set forth in claim 8 , wherein said first link selecting means is connected to a forward traffic channel signal to be spread out.
Claim 12
Dependent Claim
27 words
The modulator as set forth in claim 8 , wherein said first link selecting means is connected to a forward synchronous channel signal to be spread out.
Claim 13
Dependent Claim
27 words
The modulator as set forth in claim 8 , wherein said first link selecting means is connected to a forward paging channel signal to be spread out.
Claim 14
Dependent Claim
27 words
The modulator as set forth in claim 8 , wherein said first link selecting means is connected to a reverse traffic channel signal to be spread out.
Claim 15
Dependent Claim
27 words
The modulator as set forth in claim 8 , wherein said first link selecting means is connected to a reverse access channel signal to be spread out.
Claim 16
Dependent Claim
249 words
The modulator as set forth in claim 8 , wherein said first link selecting means comprises: a serial to parallel converter for converting at least one of said reverse channel and said forward channel signal to be spread out to a 2 parallel bit signal and for transferring to an I multiplexer and a Q multiplexer, respectively; said I multiplexer having means for selecting at least one of said reverse channel signal and said forward channel signal to be spread out if a transfer rate is less than under the 32 kbps in a 5 Mhz bandwidth, and 80 kbps in a 10 Mhz bandwidth, respectively, in a reverse operation mode, and means for selecting an output signal of said serial to parallel converter if said transfer rate is greater than said 32 kbps in a 5 MHZ bandwidth and 80 kbps in a 10 MHZ bandwidth; a Q multiplexer having means for selecting the reverse or forward channel signal to be spread out, if a transfer rates are less than 32 kbps in a 5 MHZ bandwidth and 80 kbps in a 10 Mhz bandwidth, respectively, in a reverse operation mode, and means for selecting an output signal of the serial to parallel converter if said transfer rate is greater than said 32 kbps in a 5 MHZ bandwidth and 80 kbps in a 10 MHZ bandwidth; and, a symbol repeater for executing a symbol iteration for the transferred signals from said I multiplexer and said Q multiplexer.
Claim 17
Dependent Claim
59 words
The modulator as set forth in claim 8 , wherein said Hadamard spreading means comprises: a I Hadamard spreader for spreading said reverse signal or said forward I signal by said first Hadamard code, and a Q Hadamard spreader for spreading said reverse Q signal by said second Hadamard code and the forward signal by said first Hadamard code.
Claim 18
Dependent Claim
68 words
The modulator as set forth in claim 8 , wherein said pseudo-noise (PN) code spreading m means comprises: an I pseudo-noise (PN) code spreader for spreading at least one of said reverse signal and said forward I by a first PN code, and a Q PN spreader for spreading said reverse Q signal by said first PN code and said forward Q signal by the second PN code.
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