Method and apparatus for equalization in transmit and receive levels in a broadband transceiver system

Abstract

A method ( 100 ) for amplitude equalization in transmit and receive levels in a base station wideband transceiver ( 50 ) includes the step of assigning ( 102 ) a plurality of transmit and receive carrier frequencies to the base station wideband transceiver and the step of flattening ( 104 ) the power in the plurality of transmit and receive carrier frequencies in the plurality of base wideband transceivers using software amplitude pre-distortion.

We claim: 
     
       1. In a base station wideband transceiver capable of operating in a wireless cellular communications system that communicates with mobile subscribers, a method for equalization in transmit and receive levels, comprising the steps of:
 assigning a plurality of transmit and receive carrier frequencies to the base station wideband transceiver; 
 flattening a spectral response of said base station transceiver across a range of frequencies including the plurality of transmit and receive carrier frequencies using software amplitude pre-distortion; 
 wherein the method further comprises the step of making narrowband IF channel measurements using an automated broadband radio frequency transceiver test (ABRFTT) to determine a set of coefficients for each narrowband IF channel; 
 wherein the ABRFTT further comprises the step of making wideband RF channel measurements that step through the wideband bandwidth to determine a set of coefficients for the wideband RF channel; 
 wherein the ABRFTT creates 25 narrowband coefficients for a 5 MHz IF bandwidth and 300 wideband coefficients for a 60 MHz RF bandwidth having 200 kHz channels. 
 
     
     
       2. A method for equalizing a spectral response of a wireless cellular base station transceiver configurable for operating within any one of a plurality of relatively narrow segments of a wireless communications band, comprising the steps of:
 storing a generic set of coefficients representative of amplitude distortions occurring as a result of signal conversions between analog and digital formats in said base station transceiver;   storing at least one set of transceiver specific coefficients representative of amplitude distortions associated with a specific broadband base station RF transceiver; and   equalizing an amplitude response of said specific broadband base station RF transceiver at a plurality of transmit and receive carrier frequencies within a selected one of said segments using said generic set of coefficients and said transceiver specific coefficients to perform software amplitude pre-distortion.   
     
     
       3. The method according to  claim 2  further comprising the step of selecting said at least one set of transceiver specific coefficients to include a first set of transceiver specific coefficients representative of amplitude distortions exclusive to narrowband processing within said specific broadband base station transceiver. 
     
     
       4. The method according to  claim 3  further comprising the step of selecting said transceiver specific coefficients to further include at least a second set of transceiver specific coefficients representative of amplitude distortions associated with wideband signal processing within said specific broadband base station transceiver. 
     
     
       5. The method according to  claim 4  further comprising the step of performing said software amplitude pre-distortion concurrently using said first and second sets of transceiver specific coefficients. 
     
     
       6. A broadband wireless cellular base station transceiver configurable for operating within any one of a plurality of relatively narrow segments of a wireless communications band, comprising;
 a receiver comprising at least one device for converting between an analog and a digital format;   a memory device containing a generic set of coefficients representative of amplitude distortions occurring as a result of signal conversions between analog and digital formats in said base station transceiver;   a memory device containing at least one set of transceiver specific coefficients representative of amplitude distortions associated with said specific base station RF transceiver; and   at least one digital signal processor programmed to equalize an amplitude response of said specific broadband base station RF transceiver at a plurality of transmit and receive carrier frequencies within a selected one of said segments using said generic set of coefficients and said transceiver specific coefficients to perform software amplitude pre-distortion.   
     
     
       7. The broadband wireless cellular base station transceiver according to  claim 6  wherein said at least one set of transceiver specific coefficients includes a first set of transceiver specific coefficients representative of amplitude distortions exclusive to narrowband processing within said specific broadband base station RF transceiver. 
     
     
       8. The broadband wireless cellular base station transceiver according to  claim 7  wherein said transceiver specific coefficients further include at least a second set of transceiver specific coefficients representative of amplitude distortions associated with wideband signal processing within said specific broadband base station RF transceiver. 
     
     
       9. The broadband wireless cellular base station transceiver according to  claim 8  wherein said digital signal processor concurrently uses said first and second sets of transceiver specific coefficients to perform said software amplitude predistortion. 
     
     
       10. A base station wideband transceiver capable of operating in a wireless cellular communications system that communicates with mobile subscribers, comprising:
 a receiver section that is assigned a plurality of transmit and receive carrier frequencies;   a transmitter section configured to flatten a spectral response of said base station transceiver across a range of frequencies including the plurality of transmit and receive carrier frequencies using amplitude pre-distortion;   wherein the transmitter section is further configured to make narrowband IF channel measurements using an automated broadband radio frequency transceiver test (ABRFTT) to determine a set of coefficients for each narrowband IF channel;   wherein the ABRFTT is configured to make wideband RF channel measurements that step through the wideband bandwidth to determine a set of coefficients for the wideband RF channel;   wherein the ABRFTT is further configured to create 25 narrowband coefficients for a 5 MHz IF bandwidth and 300 wideband coefficients for a 60 MHz RF bandwidth having 200 kHz channels.   
     
     
       11. In a base station wideband transceiver capable of operating in a wireless cellular communications system that communicates with mobile subscribers, a method for equalization in transmit and receive levels, comprising:
 assigning a plurality of transmit and receive carrier frequencies to the base station wideband transceiver;   flattening a spectral response of said base station transceiver across a range of frequencies including the plurality of transmit and receive carrier frequencies using amplitude pre-distortion,   wherein the method further comprises making narrowband IF channel measurements using an automated broadband radio frequency transceiver test (ABRFTT) to determine a set of coefficients for each narrowband IF channel,   wherein the ABRFTT comprises making wideband RF channel measurements that step through the wideband bandwidth to determine a set of coefficients for the wideband RF channel that is different in number from the set of coefficients for each narrowband IF channel, and   determining a gain to be assigned to each transmit channel and each receive channel of the base station wideband transceiver to achieve equalization in transmit and receiving power levels using the set of coefficients for each narrowband IF channel and the set of coefficients for the wideband RF channel in combination.   
     
     
       12. A base station wideband transceiver capable of operating in a wireless cellular communications system that communicates with mobile subscribers, comprising:
 a receiver section that is assigned a plurality of transmit and receive carrier frequencies;   a transmitter section configured to flatten a spectral response of said base station transceiver across a range of frequencies including the plurality of transmit and receive carrier frequencies using amplitude pre-distortion;   wherein the transmitter section is further configured to make narrowband IF channel measurements using an automated broadband radio frequency transceiver test (ABRFTT) to determine a set of coefficients for each narrowband IF channel;   wherein the ABRFTT is configured to make wideband RF channel measurements that step through the wideband bandwidth to determine a set of coefficients for the wideband RF channel that is different in number from the set of coefficients for each narrowband IF channel;   wherein the transmitter section is configured to use the set of coefficients for each narrowband IF channel and the set of coefficients for the wideband RF channel in combination to determine a gain to be assigned to each transmit channel and each receive channel of the base station wideband transceiver to achieve equalization in transmit and receive power levels.   
     
     
       13. A wireless communications system accessible by multiple wireless communicators, comprising:
 a plurality of base station wideband transceivers capable of operating in a wireless communications system accessible by mobile communicators, each of the plurality of base station wideband transceivers comprising:   a receiver section that is assigned a plurality of transmit and receive carrier frequencies; and   a transmitter section configured to flatten a spectral response of the base station wideband transceiver across a range of frequencies including the plurality of transmit and receive carrier frequencies using amplitude pre-distortion;   wherein the transmitter section is further configured to make narrowband IF channel measurements using an automated broadband radio frequency transceiver test (ABRFTT) to determine a set of coefficients for each narrowband IF channel;   wherein the ABRFTT is configured to make wideband RF channel measurements that step through the wideband bandwidth to determine a set of coefficients for the wideband RF channel; and   wherein the ABRFTT is further configured to create 25 narrowband coefficients for a 5 MHz IF bandwidth and 300 wideband coefficients for a 60 MHz RF bandwidth having 200 kHz channels and stores the narrowband and wideband coefficients in a memory device.   
     
     
       14. The method according to claim 11, wherein the ABRFTT further comprises creating 25 narrowband coefficients for a 5 MHz IF bandwidth and 300 wideband coefficients for a 60 MHz RF bandwidth having 200 kHz channels. 
     
     
       15. The base station wideband transceiver according to claim 12, wherein the ABRFTT is further configured to create 25 narrowband coefficients for a 5 MHz IF bandwidth and 300 wideband coefficients for a 60 MHz RF bandwidth having 200 kHz channels. 
     
     
       16. The method according to claim 1, further comprising storing the set of coefficients for each narrowband IF channel and the set of coefficients for the wideband RF channel in a storage within the base station wideband transceiver. 
     
     
       17. The base station wideband transceiver according to claim 10, further comprising a storage coupled between the receiver section and the transmitter section and configured to store the set of coefficients for each narrowband IF channel and the set of coefficients for the wideband RF channel.