CDMA radio transmitting apparatus and CDMA radio receiving apparatus

• US 6,330,233 B1
• Filed: 04/30/1998
• Issued: 12/11/2001
• Est. Priority Date: 07/29/1997
• Status: Expired due to Term

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Uesugi, Mitsuru, Miya, Kazuyuki
• Primary Examiner(s): Kizou, Hassan
• Assistant Examiner(s): Qureshi, Afsar M.
• Application Number:
  US09/070,007
• Time in Patent Office: 1,321 Days
• Field of Search: 370/200, 370/336, 370/355, 370/342, 370/345, 370/474, 370/470, 370/335, 370/468, 370/337, 370/347, 375/200, 375/309
• US Class Current: 370/342
• CPC Class Codes: H04B 7/264 for data rate control

Abstract

In a CDMA radio transmitting apparatus that controls generation of unnecessary frequency components, variable data, after assembled by frame assembly circuit in frame units, is time-multiplexed with fixed data in slot assembly circuit. At this time, slot assembly circuit reads the placement location information of fixed data in each slot from memory and carries out time-multiplexing based on the information using random patterns whose repetition cycle is one super frame.

Claims

1. A CDMA radio transmission apparatus, comprising;

a multiplexer that time-multiplexes variable data and fixed data and outputs transmission data, the variable data having a quantity of data being variable with respect to time and the fixed data having a quantity of data being fixed with respect to time; and

a randomizer that randomizes a transmission timing of the fixed data by controlling a placement pattern of the fixed data when the variable data does not exceed a predetermined value, said randomizer comprising a data memory that stores a plurality of placement patterns and a pattern determiner that determines at least one of the plurality of placement patterns to be extracted for use by said randomizer; and

a radio transmitter for transmitting the transmission data.

2. The CDMA radio transmission apparatus according to claim 1, wherein a quantity of placement patterns in the plurality of placement patterns stored in said data memory corresponds to a quantity of slots housed in a superframe, the superframe comprising a plurality of frames and each of the plurality of frames comprising a plurality of slots;

wherein said data memory stores the placement patterns according to a frame number corresponding to one of the plurality of frames and a slot number corresponding to one of the plurality of slots; and

wherein said pattern determiner extracts the placement patterns from said data memory based on the frame numbers and the slot numbers.

3. The CDMA radio transmission apparatus according to claim 1, wherein said data memory stores a first pattern placement group comprising a first plurality of placement patterns, in which the fixed data are concentrated on a first half of each slot, and a second pattern placement group comprising a second plurality of placement patterns, in which the fixed data are randomized over an entirety of each slot;

and

wherein said pattern determiner determines to extract the first pattern placement group when the quantity of data variable with respect to time is large and determines to extract the second pattern placement group when the quantity of data variable with respect to time is small or nonexistent.

4. A CDMA radio receiving apparatus, comprising;

a radio receiver that receives a radio signal resulting from a time-multiplexing of fixed data and variable data;

a demodulator that demodulates the radio signal and outputs received data; and

a separator that separates the received data into the fixed data and the variable data, based on a plurality of receiving side placement patterns of fixed data, which are the same as a plurality of transmitting side placement patterns of the fixed data used in the time-multiplexing of the fixed data and the variable data prior to transmission;

wherein the separator comprises a data memory that stores the plurality of receiving side placement patterns of the fixed data and a pattern restorer that extracts the receiving side placement pattern.

5. The CDMA radio receiving apparatus according to claim 4, wherein a quantity of receiving side placement patterns in the plurality of receiving side placement patterns stored in said data memory corresponds to a quantity of slots housed in a superframe, the superframe comprising a plurality of frames and each of the plurality of frames comprising a plurality of slots;

wherein said data memory stores the receiving side placement patterns according to a frame number corresponding to one of the plurality of frames and a slot number corresponding to one of the plurality of slots; and

wherein said pattern restorer extracts the receiving side placement patterns from said data memory based on the frame numbers and the slot numbers.

6. The CDMA radio transmission apparatus according to claim 4, wherein said data memory stores a first pattern placement group comprising a first plurality of receiving side placement patterns, in which the fixed data are concentrated on a first half of each slot, and a second pattern placement group comprising a second plurality of receiving side placement patterns, in which the fixed data are randomized over an entirety of each slot;

and

wherein said pattern restorer determines to extract the first pattern placement group when the first quantity of data variable with respect to time is large and determines to extract the second pattern placement group when the first quantity of data variable with respect to time is small or nonexistent.

7. A CDMA radio transmission method for transmitting multiplexed data resulting from a time-multiplexing of fixed data and variable data, the method comprising:

generating a placement pattern of the fixed data, the placement pattern randomizing a transmission timing of the fixed data when a quantity of the variable data is less than a predetermined value;

time-multiplexing the fixed data and the variable data based on the generated placement pattern; and

transmitting the time-multiplexed data.

8. A CDMA radio transmission method for transmitting multiplexed data resulting from a time-multiplexing of fixed data and variable data, the method comprising:

generating a placement pattern of the fixed data, the placement pattern being selected from a plurality of placement patterns of predetermined fixed data based on a frame number and a slot number of the fixed data;

time-multiplexing the fixed data and the variable data based on the generated placement pattern; and

transmitting the time-multiplexed data.

9. A CDMA radio receiving method for receiving a radio signal, the method comprising:

receiving a time-multiplexed transmission signal comprising fixed data and variable data;

demodulating the time-multiplexed transmission signal and outputting received data; and

separating the received data into received fixed data and received variable data based on a placement pattern of the received fixed data, the placement pattern of the received fixed data being the same as a placement pattern of the fixed data of the time-multiplexed transmission signal;

wherein the placement pattern of the received fixed data is extracted from a data memory comprising a plurality of predetermined placement patterns.

10. A CDMA radio transmission apparatus comprising:

a multiplexer that time-multiplexes variable data and fixed data and outputs transmission data, the variable data having a quantity of data being variable with respect to time and the fixed data having a quantity of data being fixed with respect to time; and

a randomizer that randomizes a transmission timing of the fixed data by controlling a placement of the fixed data when at least the variable data is not present;

wherein the randomizer comprises a data memory that stores a plurality of placement pattern data corresponding to the fixed data and a pattern determiner that determines at least one of the plurality of placement pattern data to be extracted from said data memory for controlling the placement of the fixed data.