1. A system for downloading a ROM image to a wireless terminal, the system comprising:
a host system configured to provide the ROM image, wherein the host system includes a wireless LAN AP (Access point) device configured to transmit the ROM image through a wireless LAN network, and
the wireless terminal configured to download the ROM image provided from the host system that includes a wireless LAN device, wherein the wireless LAN device is coupled to the wireless LAN AP device of the host system by the wireless LAN network to download the ROM image stored in the host system.
2. The system according to claim 1, wherein the wireless terminal is a PDA (Personal data assistant).
3. The system according to claim 2, wherein the downloaded ROM image is stored in a flash memory disposed in the wireless terminal.
4. The system according to claim 3, wherein the flash memory is provided with a bootloader program, and the downloaded ROM image is stored by a ROM flash update software in the bootloader program.
5. The system according to claim 4, wherein the ROM flash update software erases a current ROM image stored in the flash memory and stores the downloaded ROM image.
6. The system according to claim 5, wherein the current ROM image was set during manufacture of the wireless terminal.
7. The system according to claim 4, wherein a wireless network path between the wireless terminal and the host system is formed by performing a predetermined security procedure using a wireless communication protocol in the bootloader program.
8. The system according to claim 1, wherein the wireless LAN AP device of the host system is controlled by a wireless AP control program provided in a RAM memory of the host system.
9. The system according to claim 1, wherein the wireless terminal further comprises a monitor console for the wireless terminal and performs a ROM image download request and a ROM image download progress status confirmation through the monitor console, and wherein the host system further comprises a monitor console for the host system and confirms download progress status of wireless terminals that download the ROM image from the host system through the monitor console.
10. The system according to claim 1, wherein the host system concurrently downloads the ROM image to a plurality of wireless terminals.
11. A method for downloading a ROM image to a wireless terminal, the method comprising:
selecting a ROM image download mode at a wireless terminal;
performing a security authentication procedure of a wireless LAN network for a wireless networkdata transmission path formation between the wireless terminal and a host system providing the wireless terminal with the ROM image;
forming the wireless network and the data transmission path between the wireless terminal and the host system providing the wireless terminal with the ROM image;
receiving a file data of the ROM image from the host system at the wireless terminal and storing the ROM image in a first memory space; and
replacing a current ROM image stored in a flash memory of the wireless memory with the ROM image stored in the first memory space.
12. The method according to claim 11, wherein the wireless terminal is a PDA (Personal data assistant).
13. The method according to claim 11, wherein the first memory space is a volatile RAM or additional flash memory.
14. The method according to claim 11, wherein the flash memory is nonvolatile, and the ROM image is greater than 50 Mbytes.
15. The method according to claim 11, comprising:
resetting the wireless terminal when the ROM image download is completed, wherein the resetting comprises,
rebooting the wireless terminal, and
performing an operation mode at the wireless terminal.
16. The method according to claim 11, wherein the selecting a ROM image download mode comprises displaying a selection menu including the normal operation mode and the ROM image download mode to a user, wherein the user selects the ROM image download mode.
17. The method according to claim 11, wherein the ROM image download mode is selected by pushing a combination of buttons of the wireless terminal.
18. The method according to claim 11, wherein the performing the security authentication procedure of the wireless LAN network comprises:
creating SSID and security key data of the host system at the wireless terminal and transmitting the created SSID and security key data to the host system; and
confirming the transmitted SSID and security key data comply with stored SSID and security key data at the host system, and initiating a data protocol between the wireless terminal and an AP of the host system when the transmitted SSID and security key data comply with stored SSID and security key data.
19. The method according to claim 18, wherein the creating comprises setting the security key data according to a SSID of a predetermined AP stored in the ROM flash update software.
20. The method according to claim 18, wherein the wireless terminal selects the host system using the predetermined SSID.
21. The method according to claim 11, wherein the wireless terminal and the host system have a wireless LAN card and a wireless LAN AP device, respectively, to perform a ROM image download through a wireless LAN network.
22. The method according to claim 11, wherein after the performing the security authentication procedure of the wireless LAN network, further comprising selecting a prescribed ROM image to be downloaded to the wireless terminal by a user.
23. The method according to claim 22, wherein the prescribed ROM image to be downloaded to the wireless terminal is selected according to a language, an application program or a version by the user.
24. The method according to claim 23, wherein the prescribed ROM image is at least two ROM images selected from among a plurality of corresponding ROM images.
25. The method according to claim 11, comprising resetting the wireless terminal.
26. A method for downloading a ROM image to a PDA wireless terminal, the method comprising:
selecting a ROM image download mode at a PDA wireless terminal;
performing a security authentication procedure of a wireless LAN network for a wireless networkdata transmission path formation between the PDA wireless terminal and a host system providing the PDA wireless terminal with the ROM image;
forming the wireless network and the data transmission path between the PDA wireless terminal and the host system providing the PDA wireless terminal with the ROM image;
receiving a file data of the ROM image from the host system at the wireless terminal and storing the ROM image in a first memory space; and
replacing a current ROM image stored in a flash memory of the wireless memory with the ROM image stored in the first memory space, wherein the ROM image to be downloaded to the PDA wireless terminal is selected according to a language, an application program or a version from among a plurality of corresponding ROM images.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A wireless transmitter for modulating a loaded data to a radio frequency signal and then emitting out, said transmitter comprising:
a read only memory having a lookup table therein for storing a plurality of intermediate frequency modulation signals;
a state machine for selecting a corresponding intermediate frequency modulation signal from said lookup table of said read only memory according to said loaded data, locking and storing said intermediate frequency modulation signal, and then outputting a digital intermediate frequency modulation signal, said modulation signal in said lookup table obtained by calculating an algorithm at different frequencies, and said algorithm comprises the steps of:
dividing a modulated radio frequency signal into an intermediate frequency signal plus a carrier signal and a baseband signal to be expanded in trigonometric functions;
expanding sine terms and cosine terms of said intermediate frequency signal plus said carrier signal in trigonometric functions;
separately arranging the sine terms and cosine terms of said carrier signal to obtain coefficients respectively being two orthogonal intermediate frequency modulation signals; and
sampling and storing said intermediate frequency modulation signals into said lookup table of said read only memory according to the sampling rate;
at least a digital-to-analog converter connected to said state machine, said digital-to-analog converter converting said digital intermediate frequency modulation signal into an analog intermediate frequency modulation signal;
at least a low pass filter for filtering said analog intermediate frequency modulation signal; and
a local oscillator for generating a local oscillation signal and modulating said filtered analog intermediate frequency modulation signal to an emission frequency to obtain said radio frequency signal.
2. The wireless transmitter as claimed in claim 1, wherein if said intermediate frequency modulation signals stored in said lookup table of said read only memory are only positive-waveform intermediate frequency modulation signals, a sign inverter connected between said read only memory and said state machine is further provided to determine whether to invert said positive-waveform intermediate frequency modulation signals according to the outputted sign decided by said state machine and to transmit processed intermediate frequency modulation signals to said state machine for locking and storage.
3. The wireless transmitter as claimed in claim 1, wherein if the intermediate frequency modulation signals stored in said lookup table of said read only memory are only negative-waveform intermediate frequency modulation signals, a sign inverter connected between said read only memory and said state machine is further provided to determine whether to convert said negative-waveform intermediate frequency modulation signals according to the outputted sign decided by said state machine and to transmit processed intermediate frequency modulation signals to said state machine for locking and storage.
4. The wireless transmitter as claimed in claim 1, wherein said state machine further comprises a shift register, which outputs a data bit signal to an address generator according to said loaded data, a corresponding intermediate frequency modulation signal is acquired from said lookup table in said ROM and said intermediate frequency modulation signal is stored in a locker after said address generator generates a valid address according to index of a sample index counter, and said digital intermediate frequency modulation signal is then outputted.
5. The wireless transmitter as claimed in claim 1, wherein said digital intermediate frequency modulation signal comprises a sine digital intermediate frequency modulation signal and a cosine digital intermediate frequency modulation signal, said two digital intermediate frequency modulation signals are respectively converted and filtered by two digital-to-analog converters and two low pass filters, and said two signals are combined into said radio frequency signal to be emitted out after respectively modulated by said local oscillator.
6. The wireless transmitter as claimed in claim 1, wherein said local oscillator is a local oscillator together used with a receiver through time-sharing multiplexing way.