Receiving station for wireless telephone system with diversity transmission and method

In a CDMA cellular system that utilizes transmission diversity by transmitting a plurality of PN spread spectrum signals, a method of using a receiving station for communication of data transmitted as first, second and third PN spread spectrum modulated data signals where the first PN spread spectrum modulated data signal is formed by spreading and modulating the data with a first PN code, the second PN spread spectrum modulated data signal is formed by spreading and modulating the data with a second PN code which is different than the first PN code, and the third PN spread spectrum modulated data signal is formed by spreading and modulating the data with a third PN code which is different than said first and second PN codes, where the first PN spread spectrum modulated data signal is transmitted from a first antenna, the second PN spread spectrum modulated data signal is transmitted from a second antenna spaced apart from the first antenna and the third PN spread spectrum modulated data signal is transmitted from a third antenna spaced apart from the first and second antennas, the method comprising:

• receiving the first, second and third PN spread spectrum modulated data signals at said receiving station;
• despreading and demodulating the received first PN spread spectrum modulated data signal using the first PN code;
• despreading and demodulating the received second PN spread spectrum modulated data signal using the second PN code;
• despreading and demodulating the received third PN spread spectrum modulated data signal using the third PN code;
• reconstructing the data from the despread and demodulated data signals;
• measuring respective times of arrival of the first, second and third transmitted data signals at said receiving station;
• and
• computing the location of said receiving station from said respective measured times of arrival of said first, second and third transmitted data signals.

A subscriber station for a CDMA cellular system that utilizes transmission diversity by transmitting a plurality of PN spread spectrum signals, where data is transmitted as first and second PN spread spectrum modulated data signals where the first PN spread spectrum modulated data signal is formed by spreading and modulating the data with a first PN code and the second PN spread spectrum modulated data signal is formed by spreading and modulating the data with a second PN code which is different than the first PN code, the subscriber station comprising:

• a receiver configured to receive a first spread spectrum signal carrying data that is spread and modulated with the first PN code and a second spread spectrum signal carrying the same data that is spread and modulated with the second PN code;
• a despreader and demodulator which despreads and demodulates the received first PN spread spectrum modulated data signal using the first PN code and despreads and demodulates the received second PN spread spectrum modulated data signal using the second PN code;
• and
• a combiner which reconstructs the data from the despread and demodulated data signals.

A subscriber station for a CDMA cellular system that utilizes transmission diversity by transmitting a plurality of PN spread spectrum signals, where data is transmitted as first, second and third PN spread spectrum modulated data signals where the first PN spread spectrum modulated data signal is formed by spreading and modulating the data with a first PN code, the second PN spread spectrum modulated data signal is formed by spreading and modulating the data with a second PN code which is different than the first PN code, and the third PN spread spectrum modulated data signal is formed by spreading and modulating the data with a third PN code which is different than said first and second PN codes, where the first PN spread spectrum modulated data signal is transmitted from a first antenna, the second PN spread spectrum modulated data signal is transmitted from a second antenna spaced apart from the first antenna and the third PN spread spectrum modulated data signal is transmitted from a third antenna spaced apart from the first and second antennas, the subscriber station comprising:

• a receiver which receives the first, second and third PN spread spectrum modulated data signals;
• a despreader and demodulator which despreads and demodulates the received first PN spread spectrum modulated data signal using the first PN code, despreads and demodulates the received second PN spread spectrum modulated data signal using the second PN code and despreads and demodulates the received third PN spread spectrum modulated data signal using the third PN code;
• a combiner which reconstructs the data from the despread and demodulated data signals;
• a measuring device for measuring respective times of arrival of the first, second and third transmitted data signals at the subscriber station;
• and
• a processor for computing the location of the subscriber station from respective measured times of arrival of said first, second and third transmitted data signals.