Fixed wireless loop system having baseband combiner predistortion summing table
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04J-013/00
출원번호
US-0988050
(1997-12-10)
발명자
/ 주소
Perkins Steven B
Gibson
Jr. L Andrew
Arthur Ronald B
Butterfield Lee A
출원인 / 주소
L-3 Communications Corporation
대리인 / 주소
Perman & Green, LLP
인용정보
피인용 횟수 :
37인용 특허 :
5
초록▼
Disclosed is a method for generating I/Q waveforms for transmission over a CDMA radio channel. The method includes steps of (a) summing, for each of a plurality N of channels, the state of I bits to form an Isum value having a sign bit, the state of Q bits to form a Qsum value having a sign bit, and
Disclosed is a method for generating I/Q waveforms for transmission over a CDMA radio channel. The method includes steps of (a) summing, for each of a plurality N of channels, the state of I bits to form an Isum value having a sign bit, the state of Q bits to form a Qsum value having a sign bit, and a total number of active channels to form a channel sum value; (b) applying the Isum value and sign bit, the Qsum value and sign bit, and the channel sum value to an input of a multiplexer; and (c) time multiplexing the inputs to generate first and second sets of output bits. The first set of output bits includes a subset of the Isum value bits, a subset of the Qsum value bits, the I sign bit, and the channel sum value bits. The second set of output bits includes the subset of the Isum value bits, the subset of the Qsum value bits, the Q sign bit, and the channel sum value bits. A next step of the method sequentially applies the first and second sets of output bits to a lookup table memory device for sequentially outputting an I value and a Q value for application to a digital to analog converter for generating I/Q waveforms that are predetermined to reduce transmission power and distortion. In the preferred embodiment of this invention the lookup table memory uses the LSB of the channel sum value as the LSB of the I value and the LSB of the Q value.
대표청구항▼
[ What is claimed is:] [1.] A method for generating I/Q waveforms for transmission over a CDMA radio channel, comprising steps of:summing, for each of a plurality N of channels, the state of I bits to form an Isum value having a sign bit, the state of Q bits to form a Qsum value having a sign bit, a
[ What is claimed is:] [1.] A method for generating I/Q waveforms for transmission over a CDMA radio channel, comprising steps of:summing, for each of a plurality N of channels, the state of I bits to form an Isum value having a sign bit, the state of Q bits to form a Qsum value having a sign bit, and a total number of active channels to form a channel sum value;applying bits representing the Isum value and sign bit, the Qsum value and sign bit, and the channel sum value as inputs to a multiplexer;time multiplexing the multiplexer inputs to generate first and second sets of output bits, the first set of output bits including a subset of bits of the Isum value, a subset of bits of the Qsum value, the I sign bit, and bits of the channel sum value, the second set of output bits including the subset of the bits of the Isum value, the subset of the bits of the Qsum value, the Q sign bit, and the bits of the channel sum value; andsequentially applying the first and second sets of output bits to a lookup table memory device for sequentially outputting an Ivalue and a Qvalue for application to a digital to analog converter for generating I/Q waveforms that are predetermined to reduce transmission power and distortion, the lookup table memory device using the LSB of the channel sum value as the LSB of the Ivalue and the LSB of the Qvalue.
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이 특허에 인용된 특허 (5)
Zehavi Ephraim (San Diego CA), Method and apparatus for bifurcating signal transmission over in-phase and quadrature phase spread spectrum communicatio.
Critchlow David N. (San Diego CA) Yehushua Moshe (San Diego CA) Avis Graham M. (San Diego CA) Heimbigner Wade L. (Poway CA) Johnson Karle J. (Carlsbad CA) Wiley George A. (San Diego CA), Subscriber unit for wireless digital subscriber communication system.
Giallorenzi Thomas R. (Salt Lake City UT) Rafter Mark T. (Park City UT) Greenwood Kenneth C. (Sandy UT) Press Harry B. (Sandy UT) Kingston Samuel C. (Salt Lake City UT), Synchronous CDMA transmitter/receiver.
Giallorenzi Thomas R. (Salt Lake City UT) Rafter Mark T. (Park City UT) Greenwood Kenneth C. (Sandy UT) Press Harry B. (Sandy UT) Kingston Samuel C. (Salt Lake City UT), Synchronous multipoint-to-point CDMA communication system.
Proctor, Jr., James A.; Foore, Lawrence R.; Gorsuch, Thomas E.; Amalfitano, Carlo, Dynamic bandwidth allocation for multiple access communications using buffer urgency factor.
Gorsuch, Thomas E.; Amalfitiano, Carlo, Dynamic bandwidth allocation to transmit a wireless protocol across a code division multiple access (CDMA) radio link.
Johnson,Robert Everest; Leney,Mark Thomas; Vella Coleiro,George Philip, Method and apparatus for reducing adjacent channel power in wireless communication systems.
Kim, Wan Jong; Cho, Kyoung Joon; Kim, Jong Heon; Stapleton, Shawn Patrick, Method and system for baseband predistortion linearization in multi-channel wideband communication systems.
Kim, Wan Jong; Cho, Kyoung Joon; Kim, Jong Heon; Stapleton, Shawn Patrick, Method and system for baseband predistortion linearization in multi-channel wideband communication systems.
Kim, Wan-Jong; Cho, Kyoung Joon; Kim, Jong Heon; Stapleton, Shawn Patrick, Method and system for baseband predistortion linearization in multi-channel wideband communication systems.
Kim, Wan-Jong; Cho, Kyoung Joon; Kim, Jong Heon; Stapleton, Shawn Patrick, Method and system for baseband predistortion linearization in multi-channel wideband communication systems.
Kim, Wan Jong; Cho, Kyoung Joon; Kim, Jong Heon; Stapleton, Shawn Patrick, Method and system for baseband predistortion linearization in multi-channel wideband communications systems.
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