Method and apparatus for improving a transmission data rate of baseband data in a wireless network

• US 6,130,916 A
• Filed: 07/10/1997
• Issued: 10/10/2000
• Est. Priority Date: 07/10/1997
• Status: Expired due to Term

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: 3Com Corporation (HP Inc.)
• Inventors: Thomson, Larry Steve
• Primary Examiner(s): Vo, Don N.
• Assistant Examiner(s): PHU, PHUONG M
• Application Number:
  US08/889,970
• Time in Patent Office: 1,188 Days
• Field of Search: 375/222, 375/298, 370/204, 370/433, 370/435, 370/493, 370/494, 370/495, 455/72, 455/553, 455/557
• US Class Current: 375/285
• CPC Class Codes: H04L 25/03834 using pulse shaping

Abstract

In a wireless communication system, a method and apparatus improves a data transmission rate of baseband data via a wireless transceiver adapted for voice transmission. A modem receives baseband data for distribution to a wireless transceiver. The modem complementary pre-conditions frequency amplitudes that are subsequently augmented or pre-emphasized by the wireless transceiver. The modem then modulates the pre-conditioned baseband data for transmission by the wireless transceiver. Modulation may be performed using a single-carrier, multiple-carrier or a carrierless technique. The wireless transceiver pre-emphasizes the modulated pre-conditioned baseband data for presenting a consistent or flat amplitude spectrum to the RF transmitter.

Claims

1. In a wireless communication system, a method for improving the data transmission rate of a data signal communicated on a wireless channel via a wireless transceiver having audio processing functions adapted for communication of an audio voice signal, said method comprising the steps of:

a. receiving an unmodulated baseband data signal;

b. altering amplitudes of selected frequency components of said baseband data signal to form a pre-conditioned baseband data signal having a predetermined spectral profile, wherein the spectral profile is substantially similar in shape to the spectral profile of an audio voice signal;

c. modulating said pre-conditioned baseband data signal to form a modulated pre-conditioned baseband data signal;

d. pre-emphasizing the modulated pre-conditioned baseband data signal at the wireless transceiver to form a transmission data signal for transmission on the wireless channel, the transmission data signal having a substantially flat spectral profile; and

e. presenting said modulated pre-conditioned baseband data signal to a modulated data input of said wireless transceiver for transmission on the wireless channel.

2. The method for improving the data transmission rate of a data signal on a wireless channel as recited in claim 1, wherein said modulating said pre-conditioned baseband data step comprises the step of modulating said pre-conditioned baseband data signal with a single carrier frequency.

3. The method for improving the data transmission rate of a data signal on a wireless channel as recited in claim 1, wherein said modulating said pre-conditioned baseband data step comprises the step of modulating said pre-conditioned baseband data signal with multiple carrier frequencies.

4. The method for improving the data transmission rate of a data signal on a wireless channel as recited in claim 1, wherein said modulating said pre-conditioned baseband data step comprises the step of modulating said pre-conditioned baseband data signal using a non-carrier type encoding technique.

5. The method for improving the data transmission rate of a data signal on a wireless channel as recited in claim 1, further comprising the steps of:

a. interpolating said baseband data signal to up-sample said baseband data signal using a digital signal processor; and

b. employing said digital signal processor to perform said altering amplitudes step.

6. In a wireless transceiver having audio processing functions adapted for transceiving voice information, a method for improving a data transmission rate of baseband data, said method comprising the steps of:

(a) receiving said baseband data at said wireless transceiver;

(b) selectively altering amplitudes of frequencies of said baseband data to complement said audio processing functions of said wireless transceiver to form pre-conditioned baseband data;

(c) modulating said pre-conditioned baseband data to form modulated pre-conditioned baseband data;

(d) selectively altering amplitudes of said modulated pre-conditioned baseband data to form pre-emphasized modulated pre-conditioned baseband data having essentially flat frequency amplitudes across said pre-emphasized modulated pre-conditioned baseband data; and

(e) transceiving said pre-emphasized modulated pre-conditioned baseband data.

7. The method for improving a data transmission rate of baseband data as recited in claim 6, wherein said step of selectively altering amplitudes of frequencies of said baseband data comprises the step of spectral shaping said baseband data.

8. The method for improving a data transmission rate of baseband data as recited in claim 6, wherein said modulating said pre-conditioned baseband data step comprises the step of modulating said pre-conditioned baseband data with a single carrier frequency.

9. The method for improving a data transmission rate of baseband data as recited in claim 6, wherein said modulating said pre-conditioned baseband data step comprises the step of modulating said pre-conditioned baseband data with multiple carrier frequencies.

10. The method for improving a data transmission rate of baseband data as recited in claim 6, wherein said modulating said pre-conditioned baseband data step comprises the step of modulating said pre-conditioned baseband data using a non-carrier type encoding technique.

11. The method for improving a data transmission rate of baseband data as recited in claim 6, further comprises the steps of:

(a) interpolating said baseband data to up-sample said baseband data using a digital signal processor within said wireless transceiver; and

(b) employing said digital signal processor to perform said selectively altering amplitudes step.

12. The method for improving a data transmission rate of baseband data as recited in claim 6, further comprising the step of limiting an amplitude of said pre-emphasized modulated pre-conditioned baseband data to a maximum threshold required by an assigned bandwidth of said wireless transceiver.

13. A system for improving a data transmission rate of baseband data in a wireless communication system, comprising:

a. a wireless transceiver with audio processing functions adapted for voice, the wireless transceiver being capable of generating an RF signal comprised of conditioned baseband data and further including a limiter to prevent said RF signal from exceeding an allowed bandwidth in said wireless communication system; and

b. a wireless transceiver modem for receiving baseband data, said wireless transceiver modem including;

a pre-conditioner module which selectively alters amplitudes of said baseband data below levels affected by said limiter to form pre-conditioned baseband data;

a modulator operably coupled to said pre-conditioner module for combining said pre-conditioned baseband data with a carrier signal to form modulated pre-conditioned baseband data for delivery to a modulated data input on the wireless transceiver.