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A fast transmitter based on table lookup

A technology of transmitting code and radio frequency modulation, which is applied in the field of transmitters and can solve problems such as time-consuming

Inactive Publication Date: 2005-12-28
SANDBRIDGE TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, each required step is time-consuming

Method used

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  • A fast transmitter based on table lookup
  • A fast transmitter based on table lookup
  • A fast transmitter based on table lookup

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Embodiment Construction

[0021] The present invention relates to the implementation of steps 1, 2, 3 and 4 of expansion, oversampling and pulse shape filtering. The method of the invention takes advantage of the fact that the output I and Q samples are a combination of known sample segments of size 11M (44M for M=4), the size of which is related to the input bit pattern. This method precomputes these known expanded, decimated, and filtered segments and places them in figure 2 shown in Table 22. During data transmission, the transmitter modulates at 20 the input data bits forming a symbol S into I and Q, selects the appropriate samples I, Q from a table 22, and sends them to a radio frequency modulator 18 for transmission. Furthermore, the data or symbol modulations are known and the possible combinations are pre-calculated and stored in the look-up table 20 . Dangru figure 2 Modulation and expansion of the decimated and filtered segment when processed serially as shown, can be done as image 3 to ...

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Abstract

A method that increases transmission speed by storing modulated, spread, oversampled, and filtered samples with I and Q modulated data bits in a look-up table. Bits I and Q are differentially modulated, and the lookup table is indexed based on the differential modulation.

Description

technical field [0001] The present disclosure relates generally to transmitters for network data, and more particularly to improved transmission schemes for wireless communications, such as in local area networks (LANs). Background technique [0002] Although the invention will be described for wireless communications, in particular the principles of IEEE Std 802.11 are also applicable to other transmission schemes including data modulation, spreading and oversampling ETC. [0003] IEEE Standard 802.11 (Wireless LAN Media Access Control (MAC) and Physical Layer (PHY) Specification) is a protocol standard for wireless LAN communications. Its physical layer is responsible for encoding and modulating the information packets into the baseband signal in the transmitter. As illustrated in Figure 1, for a given sequence of packet bits, the physical layer: [0004] 1. Modulate bits or symbols (symbol) with DBPSK (for 1mbps) or DQPSK (for 2mbps) or other modulation methods to obtai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04L25/03H04L27/20
CPCH04B1/707H04B2201/70707H04L25/03834H04L27/206H04L27/2071H04L27/2092H03H17/04H04L25/03H04L27/20
Inventor J·卢M·穆德吉尔
Owner SANDBRIDGE TECH INC