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A WCDMA system includes a Base Station (BS) transmitter, or forward transmitter and a pilot channel that transmits control signals between the BS and a Mobile Station (MS) to reconfigure their transmitter/receiver. Reconfiguration is performed according to the prediction of the channel attenuation a

A WCDMA system includes a Base Station (BS) transmitter, or forward transmitter and a pilot channel that transmits control signals between the BS and a Mobile Station (MS) to reconfigure their transmitter/receiver. Reconfiguration is performed according to the prediction of the channel attenuation and the threshold set at the BS or MS based on its channel power probability density function separated into three distinct equal probable regions. In one embodiment, Seamless Rate Change (SRC)/Transmitter Power Control (TPC) logic uses the predicted channel attenuation to signal both the transmitter and the receiver in a channel to reconfigure their transmit power level according to the power density function (pdf) of the channel power and threshold level. A transmission rate is reduced when the power level is below the threshold and increased when the channel power is above threshold. The pilot channel is used to signal the mobile station and the base station.

대표청구항 ▼

A WCDMA system includes a Base Station (BS) transmitter, or forward transmitter and a pilot channel that transmits control signals between the BS and a Mobile Station (MS) to reconfigure their transmitter/receiver. Reconfiguration is performed according to the prediction of the channel attenuation a

A WCDMA system includes a Base Station (BS) transmitter, or forward transmitter and a pilot channel that transmits control signals between the BS and a Mobile Station (MS) to reconfigure their transmitter/receiver. Reconfiguration is performed according to the prediction of the channel attenuation and the threshold set at the BS or MS based on its channel power probability density function separated into three distinct equal probable regions. In one embodiment, Seamless Rate Change (SRC)/Transmitter Power Control (TPC) logic uses the predicted channel attenuation to signal both the transmitter and the receiver in a channel to reconfigure their transmit power level according to the power density function (pdf) of the channel power and threshold level. A transmission rate is reduced when the power level is below the threshold and increased when the channel power is above threshold. The pilot channel is used to signal the mobile station and the base station. rms images on the thermal transfer recording web. The thermal transfer recording web roll can be prepared at a low cost without requiring much time and effort. tem according to claim 1, wherein the first light source comprises a set of a plurality of laser diodes. 5. The optical system according to claim 1, wherein the first light source comprises a plurality at arrays of light-emitting diodes. 6. An image forming apparatus, comprising: an optical system in which a first light source selectably emits image forming light beams based upon control signals and a second light source emits a lower number of image forming light beams than that of the first light source; a plurality of photoconductive devices for forming an electrostatic latent image by said optical system; a plurality of developing devices each of which is arranged in connection with each of the photoconductive devices for supplying a developer to each of said photoconductive devices to develop a latent images thereon; first and second optical devices for focusing said light; a device for reflecting and scanning light which comprises a single mirror centrally positioned between said first and second optical devices for focusing said light; a movable sheet transfer belt contacting said photoconductive members, wherein the developing images are transferrable to an image forming medium, wherein said single mirror and each said light source lie in substantially the same plane, wherein a rotational speed R1 of the means for reflecting and scanning is a set predetermined value as described in the following equations: R1=R2×(n/m)×(M/N)×(D1/D2) (rpm) m>n≥1 (m, n:integer), wherein R1 (rpm) is the rotational speed of the means for reflecting and scanning in the single color mode, R2 (rpm) is a rotational speed of the means for reflecting and scanning in the multiple color mode, M (mm/s) is a rotational speed of the photoconductive means in the single color mode, N (mm/s) is a rotational speed of the photoconductive means in the multiple color mode, D1 (dpi) is a recording density in the single color mode, D2 (dpi) is a recording density in the multiple color mode, "n" is a maximum number of the light beams of light sources for yellow, magenta and cyan, and "m" is a maximum number of the light beams of the light source for black, and wherein a clock frequency F1 of the image forming apparatus is set based on the following equation: F1=F2×(n/m)×(M/N)×(D1/D2)2(MHZ), where F1, F2 is the clock frequency at the single color mode and the multiple color mode, respectively. 7. An image forming apparatus, comprising: an optical system in which a first light source selectably emits a plurality of image forming light beams based upon control signals and a second light source is emitting a single beam; a plurality of photoconductive devices for forming an electrostatic latent image by said optical system; a plurality of developing devices each arranged in connection with each of the photoconductive devices for supplying a developer to each of said photoconductive devices to develop latent images thereon; a movable sheet transfer belt contacting said photoconductive members, wherein the developed images are transferrable to an image forming medium; means for selecting image forming modes between a multiple color mode and a single color mode; means for selecting the number of light beams of a predetermined light source based upon the selected image forming mode; means for emitting the same number of light beams with said predetermined light source and the other light sources when the multiple color mode is selected; and means for reflecting and scanning light from each said first and second light source onto an image-forming surface, and said means for reflecting and scanning light comprising a single mirror common to each said light source and centrally positioned between said first and second focusing means for focusing said light, wherein said single mirror and each said light source lie in substantially the same plane, wherein a rotational speed R1 of the means for reflecting and scanning is a s