Adaptive forward power control and adaptive reverse power control for spread-spectrum communications
First Claim
1. A transmission circuit configured to spread code a first data and a second data in accordance with two different corresponding spreading codes, a first spreading code and a second spreading code;
- the transmission circuit further being configured to output the spread first data using a first spreading code on a first channel and spread second data using a second spreading code on a second channel, respectively, the first channel derived from the first data using the first spreading code at a first data rate, and the second channel derived from the second data using the second spreading code at a second data rate, the first and second data rates being different from one another, wherein the transmission circuit is further configured to output a third channel, which does not carry the first and second data, the third channel derived by spread coding a power control bit and signaling information with a corresponding spreading code, the signaling information facilitating the processing of radio frequency signals by a base station, wherein the transmission circuit is further configured to combine the first channel, the second channel and the third channel; and
an antenna coupled to the transmission circuit, the antenna outputting a radio frequency signal derived from the combined the first, the second and the third channels;
wherein the first channel, the second channel and the third channel are transmitted at the same time, wherein the transmission circuit is further configured to determine the power control bit based on a power level of a channel received by the antenna and an interference or a noise level associated with the received channel.
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Accused Products
Abstract
A wireless code division multiple access (CDMA) communication system, including a base station (BS) and a subscriber unit (SU), uses adaptive forward power control (AFPC) and adaptive reverse power control (ARPC) to control the transmit power of forward and reverse link radio frequency (RF) channel signals, respectively. Automatic gain control (AGC) signals are produced to maintain the level of forward and reverse CDMA signals at a near constant level. The CDMA signals are despread to produce first and second despread signals. The first and second despread signals are used to produce a first error signal e1. A second error signal e2 is produced based on the AGC signals. Combined error signals are formed based on the first error signal e1 and the second error signal e2. The combined error signals are hard limited to form adaptive power control (APC) bits used to control the level of the forward and reverse link RF channel signals.
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Citations
17 Claims
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1. A transmission circuit configured to spread code a first data and a second data in accordance with two different corresponding spreading codes, a first spreading code and a second spreading code;
- the transmission circuit further being configured to output the spread first data using a first spreading code on a first channel and spread second data using a second spreading code on a second channel, respectively, the first channel derived from the first data using the first spreading code at a first data rate, and the second channel derived from the second data using the second spreading code at a second data rate, the first and second data rates being different from one another, wherein the transmission circuit is further configured to output a third channel, which does not carry the first and second data, the third channel derived by spread coding a power control bit and signaling information with a corresponding spreading code, the signaling information facilitating the processing of radio frequency signals by a base station, wherein the transmission circuit is further configured to combine the first channel, the second channel and the third channel; and
an antenna coupled to the transmission circuit, the antenna outputting a radio frequency signal derived from the combined the first, the second and the third channels;
wherein the first channel, the second channel and the third channel are transmitted at the same time, wherein the transmission circuit is further configured to determine the power control bit based on a power level of a channel received by the antenna and an interference or a noise level associated with the received channel. - View Dependent Claims (2, 3, 4, 5)
- the transmission circuit further being configured to output the spread first data using a first spreading code on a first channel and spread second data using a second spreading code on a second channel, respectively, the first channel derived from the first data using the first spreading code at a first data rate, and the second channel derived from the second data using the second spreading code at a second data rate, the first and second data rates being different from one another, wherein the transmission circuit is further configured to output a third channel, which does not carry the first and second data, the third channel derived by spread coding a power control bit and signaling information with a corresponding spreading code, the signaling information facilitating the processing of radio frequency signals by a base station, wherein the transmission circuit is further configured to combine the first channel, the second channel and the third channel; and
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6. A communication method for use in a code division multiple access (CDMA) subscriber unit, comprising:
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producing a first data and a second data; spread coding the first data and the second data in accordance with two different corresponding spreading codes, a first spreading code and a second spreading code; outputting the spread coded first data using a first spreading code on a first channel and second data using a second spreading code on a second channel, respectively; spread coding combining a power control bit and signaling information with a corresponding spreading code to produce a third channel, such that the third channel does not carry the first and second data, the signaling information facilitating processing of radio frequency signals by a base station; combining the first channel, the second channel, and the third channel; and
transmitting, with an antenna of the code division multiple access subscriber unit, a radio frequency signal that is derived from the combined the first, second and third channels, such that a first data rate associated with the first data carried by the first channel is different than a second data rate associated with the second data carried by the second channel, wherein the first, second and third channels are transmitted at the same time, wherein the transmission circuit is further configured to determine the power control bit based on a power level of a channel received by the antenna and an interference or a noise level associated with the received channel. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A code division multiple access subscriber unit, comprising:
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a transmission circuit configured to spread code a first data and a second data in accordance with two different corresponding spreading codes, a first spreading code and a second spreading code, the transmission circuit further being configured to output the spread first data using a first spreading code on a first channel and spread second data using a second spreading code on a second channel, respectively, the first channel derived from the first data using the first spreading code at a first data rate, and the second channel derived from the second data using the spreading code at a second data rate, the first and second data rates being different from one another, wherein the transmission circuit is further configured to output a third channel that does not carry the first and second data, the third channel including derived by spread coding a power control bit and signaling information with a corresponding spreading code, the signaling information facilitating the processing of radio frequency signals by a base station, wherein the transmission circuit is further configured to combine the first channel, the second channel and the third channel; and an antenna coupled to the transmission circuit, and configured to transmit a radio frequency signal derived from the combined the first, second and third channels, wherein the first, the second and the third channels are transmitted at the same time, wherein the transmission circuit is further configured to determine the power control bit based on a power level of a channel received by the antenna and an interference or a noise level associated with the received channel. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification