CN111065112B

CN111065112B - Method for bit-level management, transmitter and receiver

Info

Publication number: CN111065112B
Application number: CN201811207801.XA
Authority: CN
Inventors: 张仲尧; 李文咏
Original assignee: Realtek Semiconductor Corp
Current assignee: Realtek Semiconductor Corp
Priority date: 2018-10-17
Filing date: 2018-10-17
Publication date: 2023-07-14
Anticipated expiration: 2038-10-17
Also published as: CN111065112A

Abstract

The invention provides a bit-level management method, a transmitter and a receiver. The method comprises the following steps: calculating respective bit numbers of one or more padding fields located at one or more positions in a packet in a transmitter in the wireless local area network system; and filling one or more groups of valid data corresponding to at least one predetermined bit number into the one or more filling fields to replace one or more groups of redundant data according to the respective bit numbers of the one or more filling fields. In addition, when a receiver in the wireless local area network system receives the packet with the one or more sets of valid data, the wireless local area network system utilizes the one or more sets of valid data to improve the overall performance of the wireless local area network system.

Description

Method for bit-level management, transmitter and receiver

Technical Field

The present invention relates to a wireless local area network system, and more particularly, to a method, transmitter and receiver for bit level (bit level) management in a wireless local area network system.

Background

In a Wireless Local-Area Network (WLAN) system (e.g., a WLAN system conforming to the IEEE 802.11ax standard), various packet formats may include different padding fields (padding fields), wherein the related art satisfies many requirements for data transmission by filling redundancy data (redundancy data) into the different padding fields. However, this redundant data is generally not of any significance. Therefore, a novel method is needed to further manage the wireless local area network system to avoid the waste of transmission resources and further improve the overall performance of the wireless local area network system.

Disclosure of Invention

An objective of the present invention is to provide a method, a transmitter and a receiver for performing bit level management in a wireless local area network system, so as to avoid waste of transmission resources.

Another objective of the present invention is to provide a method, a transmitter and a receiver for performing bit-level management in a wlan system, so as to improve the overall performance of the wlan system without side effects or less likely to cause side effects.

At least one embodiment of the present invention provides a method for performing bit level management in a wireless local area network system. The method comprises the following steps: calculating respective bit numbers of one or more padding fields located at one or more positions in a packet in a transmitter in the wireless local area network system; and filling one or more groups of valid data corresponding to at least one predetermined bit number into the one or more filling fields to replace one or more groups of redundant data according to the respective bit numbers of the one or more filling fields. In addition, when a receiver in the wireless local area network system receives the packet with the one or more sets of valid data, the wireless local area network system utilizes the one or more sets of valid data to improve the overall performance of the wireless local area network system.

At least one embodiment of the present invention provides a transmitter for a wireless local area network system. The transmitter includes a processing circuit, a scrambler (scrambler) coupled to the processing circuit, and an encoder coupled to the scrambler. The processing circuit is used for calculating respective bits of one or more padding fields located at one or more positions in a packet. In addition, the processing circuit selects one or more groups of valid data corresponding to at least one predetermined bit number according to the respective bit numbers of the one or more filling fields. The scrambler scrambles one of the one or more sets of valid data according to a random seed to generate scrambled valid data. The encoder is configured to encode the scrambled valid data to generate pad data for padding into a pad field of the one or more pad fields, wherein the pad data represents the set of valid data.

At least one embodiment of the present invention provides a receiver for a wireless local area network system. The receiver includes a decoder, a descrambler (descrambler) coupled to the decoder, and a processing circuit coupled to the descrambler. After the receiver receives a packet, the decoder decodes the padding data in a padding field of a location of the one or more locations in the packet to generate decoded data. The decoder descrambles the decoded data according to a random seed to produce a set of data. The processing circuit judges whether the set of data is valid data according to a subset of the set of data.

One of the benefits of the present invention is that the one or more padding fields can be used to properly transmit the one or more sets of valid data for improving the overall performance of the wlan. In addition, implementation according to embodiments of the present invention does not add much extra cost. Therefore, the invention can improve the overall performance of the wireless local area network under the condition of no side effect or less possibility of bringing about side effect.

Drawings

Fig. 1 is a diagram illustrating a packet format of a high efficiency multi-user physical layer convergence procedure protocol data unit according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a transmitter according to an embodiment of the invention.

FIG. 3 is a flow chart of operation of the transmitter shown in FIG. 2 according to one embodiment of the invention.

Fig. 4 is a schematic diagram of a receiver according to an embodiment of the invention.

Fig. 5 is a flowchart of the receiver of fig. 4 according to an embodiment of the present invention.

Fig. 6 is a schematic diagram of a wlan system according to an embodiment of the invention.

Fig. 7 is a diagram illustrating a packet format of a physical layer convergence procedure protocol data unit according to an embodiment of the invention.

Detailed Description

In a wireless local area network system conforming to the IEEE 802.11ax standard, when a base station or an Access Point (AP) (such as a wireless network sharer) wants to transmit data to multiple Stations (STAs) (such as a multifunctional mobile phone or a laptop computer) at the same time, the data can be transmitted through a High Efficiency (HE) multi-user (MU) physical layer convergence procedure (physical layer convergence procedure, PLCP) protocol data unit (PLCP protocol data unit, PPDU).

Ext> fig.ext> 1ext> isext> aext> diagramext> ofext> aext> packetext> formatext> 100ext> ofext> aext> highext> efficiencyext> multiext> -ext> userext> physicalext> layerext> convergenceext> procedureext> protocolext> dataext> unitext> accordingext> toext> anext> embodimentext> ofext> theext> presentext> inventionext>,ext> whereinext> theext> packetext> formatext> 100ext> includesext> aext> pluralityext> ofext> fieldsext>,ext> suchext> asext> fieldsext> {ext> Lext> -ext> STFext>,ext> Lext> -ext> LTFext>,ext> Lext> -ext> SIGext>,ext> RLext> -ext> SIGext>,ext> HEext> -ext> SIGext> -ext> aext>,ext> HEext> -ext> SIGext> -ext> bext>,ext> HEext> -ext> STFext>,ext> HEext> -ext> LTFext>,ext> dataext>,ext> peext> }ext>.ext> The fields include various padding fields (padding fields). Ext> forext> exampleext>,ext> theext> highext> efficiencyext> signalext> (ext> Highext> Efficiencyext> Signalext>,ext> HEext> -ext> SIGext>)ext> fieldext> includesext> aext> highext> efficiencyext> signalext> fieldext> aext> {ext> HEext> -ext> SIGext> -ext> aext> }ext> andext> aext> highext> efficiencyext> signalext> fieldext> bext> {ext> HEext> -ext> SIGext> -ext> bext> }ext>,ext> whereext> theext> highext> efficiencyext> signalext> fieldext> bext> {ext> HEext> -ext> SIGext> -ext> bext> }ext> mayext> includeext> aext> firstext> contentext> channelext> andext> aext> secondext> contentext> channelext> encodedext> (ext> codingext>)ext> inext> 20ext> mhzext> unitsext> inext> theext> frequencyext> domainext>,ext> whereext> eitherext> ofext> theext> firstext> contentext> channelext> andext> theext> secondext> contentext> channelext> mayext> furtherext> includeext> aext> commonext> fieldext> (ext> suchext> asext> fieldsext> {ext> cfext> 1ext> }ext> andext> {ext> cfext> 2ext> }ext>)ext>,ext> aext> userext> fieldext> (ext> suchext> asext> fieldsext> {ext> ufext> 1ext> }ext> andext> {ext> uf2ext> }ext>)ext>,ext> andext> aext> padext> fieldext> (ext> suchext> asext> fieldsext> {ext> pdext> 1ext> }ext> andext> {ext> pdext> 2ext> }ext>)ext> inext> theext> timeext> domainext>.ext> In addition, the DATA field { DATA } may include the fields { PSDU, PRE-FEC-PD, POST-FEC-PD }, where the field { PSDU } may represent an entity layer convergence procedure service DATA unit (PLCP service DATA unit, PSDU), the field { PRE-FEC-PD } may represent a PRE-error correction (PRE-forward error correction, PRE-FEC) padding field in the DATA field { DATA }, and the field { POST-FEC-PD } may represent a POST-error correction (POST-forward error correction, POST-FEC) padding field in the DATA field { DATA }. In addition, the field { PE } may represent a padding field for packet extension (packet extension). One of ordinary skill will understand the respective uses of all of the fields shown in fig. 1, and the details thereof are not described in detail herein.

In some embodiments, a transmitter in the wireless local area network system may fill redundant data into the fields { PD1, PD2, PRE-FEC-PD, POST-FEC-PD, PE } to complement the required number of bits, wherein the filled redundant data may be dummy data. In order to further enhance the overall performance of the wlan system, the proposed method replaces redundant data with valid data to provide various types of information to the receiver to enhance the overall performance.

Fig. 2 is a schematic diagram of a transmitter 200 according to an embodiment of the invention, wherein the transmitter 200 may be used as an example of a transmitter in the access point, but the invention is not limited thereto. The transmitter 200 may comprise a processing circuit 220, a scrambler 240, and an encoder 260, wherein the scrambler 240 is coupled to the processing circuit 220 and the encoder 260 is coupled to the scrambler 240. As shown in fig. 2, the transmitter 200 may transmit the packet 20 to a receiving end (e.g., any of the stations). The packet 20 may include a padding field 22, wherein the padding field 22 may include one or more of the fields { PD1, PD2, PRE-FEC-PD, POST-FEC-PD, PE } shown in FIG. 1.

Referring to fig. 3 in conjunction with fig. 2, fig. 3 is a flowchart illustrating the operation of the transmitter 200 shown in fig. 2 according to an embodiment of the present invention.

In step 310, the processing circuit 220 may calculate respective bit numbers for one or more padding fields located at one or more positions in a packet, such as respective bit numbers for one or more of the fields { PD1, PD2, PRE-FEC-PD, POST-FEC-PD, PE } shown in FIG. 1. For example, taking the calculation of the padding field (such as field { PE } for packet extension) as an example, the bit length L of field { PE } _padding Can be calculated by the following formula:

N _SYM,PE ＝T _PE /(T _IDFT,us +T _GI,PE )；

L _padding ＝N _SYM,PE *N _DBPS,PE ；

wherein T is _PE Representing the length of time the packet extends, T _IDFT,us T is as follows _GI,PE Respectively represent the time length of the guard interval (guard interval), N _SYM,PE Representing the number of packet extension symbols and N _DBPS,PE Representing the number of bits per packet extension symbol. One of ordinary skill will appreciate the method of calculating other padding fields (such as the fields { PD1, PD2, PRE-FEC-PD, POST-FEC-PD }) shown in FIG. 1, and the details thereof are not described in detail herein.

In step 320, the processing circuit 220 may select one or more sets of valid data corresponding to at least one predetermined number of bits according to the respective number of bits of the one or more padding fields. For example, since the number of bits of the one or more valid DATA such as DATA { DATA1, DATA2, DATA3} is known, the processing circuit 220 may select one or more of the DATA { DATA1, DATA2, DATA3} to be filled into the filled field having a sufficient number of bits according to the respective number of bits of the one or more filled fields obtained in step 310. Note that any of the one or more sets of valid data may include fields such as an index field, a content field, a cyclic redundancy check (Cyclic Redundancy Check, CRC) field, and an end field to enable the receiving end to recognize whether the data is valid. For example, based on the check of the crc code in the crc field, the receiving end can determine whether the data is valid.

In step 330, the scrambler 240 may scramble one of the one or more sets of valid data according to a random seed (e.g., seed S) to generate scrambled valid data. For example, assuming that processing circuit 220 selects to fill the effective DATA { DATA1} into the field { PE } shown in FIG. 1 in step 320, the scrambler may scramble the effective DATA { DATA1} according to seed S to generate scrambled effective DATA such as DATA { SDATA1}.

In step 340, encoder 260 may encode the scrambled valid data (e.g., data { SDATA1 }) to generate filler data such as data { PDATA1}.

In step 350, the transmitter 200 (e.g., processing circuitry 220) may fill the padding data (e.g., data { PDATA1 }) into a padding field (e.g., padding field 22) of the one or more padding fields. In this way, the set of valid DATA such as DATA { DATA1} can be transmitted to the receiving end by the pad DATA { PDATA1} in the pad field 22, thereby improving the overall performance.

Fig. 4 is a schematic diagram of a receiver 400 according to an embodiment of the invention, wherein the receiver 400 may be used as an example of a receiver in any of the stations, but the invention is not limited thereto. The receiver 400 may include a processing circuit 420, a descrambler 440, and a decoder 460, wherein the descrambler 440 is coupled to the decoder 460 and the processing circuit 420 is coupled to the descrambler 440. As shown in fig. 4, the receiver 400 may receive packets 40 from a transmitting end (e.g., any ap in the vicinity). The packet 40 may include a padding field 42, wherein the padding field 42 may include one or more of the fields { PD1, PD2, PRE-FEC-PD, POST-FEC-PD, PE } shown in FIG. 1.

Please refer to fig. 5 in conjunction with fig. 4, wherein fig. 5 is a flowchart illustrating the operation of the receiver 400 shown in fig. 4 according to an embodiment of the present invention.

In step 510, the receiver 400 may receive the packet 40.

In step 520, the decoder 460 may decode padding data, such as data { PDATAx } in a pad field (such as pad field 42) located at one of the one or more locations in the packet 40 to generate decoded data, such as data { DDATAx }.

In step 530, the descrambler 440 may descramble the decoded data, such as data { DDATAx }, according to a random seed to generate a set of data, such as data { DATAx }. For example, when the packets received by the receiver 400 are from a transmitter (e.g., the transmitter 200 shown in fig. 2) manufactured by the same manufacturer, the descrambler 440 may descramble the DATA { DDATAx } according to the same random seed (e.g., the seed S) as the random seed used in step 330 in step 530 to successfully recover the valid DATA such as the DATA { DATA1}, which is transmitted by the transmitter 200.

In step 540, the processing circuit 420 may determine whether the set of data is valid data according to a subset of the set of data. Specifically, the processing circuit 420 may determine whether the set of data is valid data according to the crc field in the set of data, and proceed to step 550 when the set of data is valid data; otherwise, step 560 is entered.

When the packet received by the receiver 400 is from a transmitter (e.g., transmitter 200) manufactured by the same manufacturer, the descrambler 440 can recover the data including the index field, the content field, the crc field and the tail field according to the random seed (e.g., seed S), and the set of data such as data DATAx generated by the descrambler 440 can also pass the crc, so that the receiver 400 can determine the set of data as valid data. In contrast, when the packet received by the receiver 400 is not from a transmitter manufactured by the same manufacturer, the descrambler 440 cannot recover the data including the index field, the content field, the crc field and the end field according to the random seed (e.g., seed S), and the set of data such as data DATAx generated by the descrambler 440 cannot pass the crc, so that the receiver 400 can determine that the set of data is redundant data instead of valid data.

In step 550, the receiver 400 may utilize the set of data to enhance overall performance.

In step 560, the set of data is not used because it is redundant data. That is, when the receiver 400 receives packets from devices (or transmitters) manufactured by other manufacturers, the receiver 400 automatically ignores the padding bits (i.e., the data of the padding fields) when interpreting the padding bits, so that there is no problem of inter-operability (IOT).

In accordance with one embodiment of the present invention, the one or more sets of valid data may include one or more of information of available channels (available channel) in the vicinity of the wireless local area network system, transmit power weights for a plurality of receivers, interference information, back off time information, and contention window (contention window) information. In this embodiment, the wlan system may increase the accuracy of channel estimation (channel estimation) by means of the transmit power weights, or the wlan system may transmit one or more of the interference information, the backoff time information, and the contention window information through the one or more padding fields to reduce the number of handover (handoff). In another embodiment, the wireless local area network system may enhance long-term basic service set (basis service set, BSS) performance, such as long-term information statistics or resource allocation, by transmitting the one or more sets of valid data.

Fig. 6 is a schematic diagram of a wlan system according to an embodiment of the invention. As shown in fig. 6, there are two access points in this area, including

access points

610 and 620, where examples of

access points

610 and 620 may include (but are not limited to): a wireless network base station and/or a wireless network sharer. In this embodiment, the ap 610 is an ap including a transmitter (e.g., the transmitter 200) according to the present invention, and the ap 620 is a typical ap. In addition,

stations

612, 614, and 616 are stations that include a receiver proposed by the present invention (e.g., receiver 400), while

stations

622 and 624 are typical stations, where examples of any of

stations

612, 614, 616, 622, and 624 may include (but are not limited to): multifunctional cell phones, laptops, tablet computers, or wearable electronic devices, among others.

In addition, the IEEE 802.11ax standard is mainly characterized by Orthogonal Frequency Division Multiple Access (OFDMA) technology (Orthogonal Frequency Division Multiple Access) in comparison with the IEEE 802.11ac standard, and when a station receives a high-efficiency multi-user physical layer convergence procedure protocol data Unit (pdu) from an access point, only a Resource Unit (RU) corresponding to the station itself needs to be received. After the initial channel estimation is done in the high-efficiency long training field (HE long training field, HE-LTF), since the minimum unit of the resource unit is 26 subcarriers (subcarriers), the amount of information may not be enough for the receiver to make further channel smoothing (channel smoothing) to obtain a more accurate channel estimation without using the method of the present invention. According to an embodiment of the present invention, the station may utilize subcarrier information corresponding to resource units of adjacent stations to provide more information to perform channel smoothing, so that the station can improve channel estimation accuracy of its own resource units on channel edge subcarriers. For example, the distances between

stations

612, 614, 616, 622, and 624 and access point 610 shown in fig. 6 are far or near, and the energy levels of the corresponding resource units should be different for different near or far stations. One application of the proposed method is therefore that the ap 610 can fill the high efficiency signal field B { HE-SIG-B } shown in fig. 1 with the resource element energy size parameter (RU power boost factor) corresponding to some or all of the neighboring stations (e.g., some or all of

stations

612, 614, 616, 622, and 624) so that the receiving end can know the resource element power ratio between the neighboring stations corresponding to some or all of them. In this way, any one of

stations

612, 614 and 616 can take into account the energy parameters of the resource units corresponding to the neighboring stations when performing channel smoothing, and by having more subcarrier information after frequency domain energy normalization (normalized), the current receiving performance of the receiving end (e.g., any one of

stations

612, 614 and 616) can be improved.

In addition, since the fields { PE } and { POST-FEC-PD } shown in FIG. 1 are used to allow the receiving end enough time to process the packet and return an acknowledgement signal or a feedback signal, the fields { PE } and { POST-FEC-PD } are not recommended to be filled with information related to the current reception, but are used for long-term information statistics to improve long-term performance. Ext> forext> exampleext>,ext> theext> sameext> modulationext> methodext> asext> theext> highext> efficiencyext> signalext> fieldext> aext> {ext> HEext> -ext> SIGext> -ext> aext> }ext> mayext> beext> usedext> inext> theext> fieldext> {ext> PEext> }ext> toext> entrainext> messagesext> suchext> asext> informationext> ofext> overlappingext> basicext> serviceext> setsext> (ext> overlappingext> basisext> serviceext> setext>,ext> obssext>)ext>,ext> trafficext> (ext> trafficext>)ext> informationext>,ext> transmitext> powerext> …ext>,ext> etcext>.ext> In addition, enhanced distributed channel access (Enhanced Distributed Channel Access, EDCA) parameters may be included in the field { PE } when the access point 610 transmits data packets to reduce the probability of collision from home to home (i.e., multiple devices manufactured by the same manufacturer, such as any two or more of

stations

612, 614, and 616).

In addition, in a wireless local area network system conforming to the IEEE 802.11ac standard, DATA or packets transmitted by an access point to a station may include a pre-error correction (pre-FEC) padding field of very high throughput DATA (Very High Throughput Data, VHT-DATA) fields. In some embodiments, the ap may enhance overall performance by the fec pre-fill field entraining valid data (such as one or more of the sets of valid data in the embodiments described above), but the invention is not limited thereto.

On the other hand, the embodiments of the present invention can also be applied to IEEE 802.11a, 802.11g, or 802.11n standards. Taking the IEEE 802.11n standard as an example, fig. 7 is a schematic diagram of a packet format 700 of an phy convergence procedure protocol data unit according to the IEEE 802.11n standard according to an embodiment of the present invention. The packet format 700 may include fields { PREAMBLE, L-SIG700, HT-SIG, HT-transmitting, DATA700, SIGNAL-output }, and the DATA field { DATA700} may include fields { PSDU700, TAIL-BITS }, and a pad field { PD } may be further included after the TAIL-end of the DATA field { DATA }, i.e., field { TAIL-BITS }, when the system uses binary convolutional coding (binary convolutional coding, BCC), wherein field { PD } is a standard undefined field, and the receiver does not input field { PD } to the decoder for decoding in general. In one embodiment of the present invention, an access point may enhance overall performance by at least entraining valid data (such as one or more of the sets of valid data in the above embodiments) through the tail-stuffing field of the data field of the packet. In addition, one of ordinary skill will recognize that the respective uses of other fields in FIG. 7, such as { PRAMBLE, L-SIG700, HT-SIG, HT-TRAINING, SIGNAL-EXTENSION, PSDU700, TAIL-BITS } are not described in detail herein.

In summary, the method provided by the invention can replace redundant data in the filling fields by effective data, and fully utilize the spaces of the filling fields to transmit the effective data so as to improve the overall performance. For example, transmissions between the ap 610 and

stations

612, 614, 616 shown in fig. 6 (i.e., between aps and stations manufactured by the same manufacturer) may utilize the valid data entrained in the padding fields to improve transmission performance as compared to transmissions using typical aps such as ap 620 or stations such as

stations

622 and 624. In addition, the transmitter and the receiver implemented according to the method of the present invention do not have interoperability problems when transmitting with a typical transmitter or receiver. Therefore, the invention can improve the overall performance of the wireless local area network under the condition of no side effect or less possibility of bringing about side effect.

The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Symbol description

100. 700 packet format

20. 40 packets

22. 42 fill field

200. Conveyor

400. Receiver with a receiver body

220. 420 processing circuit

240. Scrambler

440. De-scrambling device

260. Encoder with a plurality of sensors

460. Decoder

610. 620 access point

612. 614, 616, 622, 624 station

310、320、330、340、350、

510. 520, 530, 540, 550, 560 steps

DATA1、SDATA1、PDATA1、

DATAx, SDATAx, PDATAx data

L-STF、L-LTF、

L-SIG、RL-SIG、

HE-SIG-A、HE-SIG-B、

HE-STF、HE-LTF、

DATA、PE、

CF1、UF1、PD1、

CF2、UF2、PD2、

PSDU、

PRE-FEC-PD、POST-FEC-PD、

PREAMBLE、L-SIG700、HT-SIG、

HT-TRAINING、DATA700、

SIGNAL-EXTENSION、PSDU700、

TAIL-BITS, PD field.

Claims

1. A method for bit-level management in a wireless regional network system, comprising:

calculating respective bit numbers of one or more padding fields located at one or more positions in a packet in a transmitter in the wireless local area network system; and

filling one or more sets of valid data corresponding to at least one predetermined number of bits into the one or more padding fields to replace one or more sets of redundant data according to respective numbers of bits of the one or more padding fields;

wherein when a receiver in the wireless local area network system receives the packet with the one or more sets of valid data, the wireless local area network system utilizes the one or more sets of valid data to enhance the overall performance of the wireless local area network system,

wherein filling the one or more sets of valid data corresponding to the at least one predetermined number of bits into the one or more padding fields comprises:

scrambling, by a scrambler in the transmitter, one of the one or more sets of valid data according to a random seed to produce scrambled valid data; and

the scrambled valid data is encoded by an encoder in the transmitter to generate pad data for filling into a pad field of the one or more pad fields, wherein the pad data represents the one or more sets of valid data.

2. The method of claim 1, wherein the one or more padding fields are used at least for a tail end of a data field of the packet.

3. The method of claim 1, wherein the one or more padding fields are a forward error correction pre-padding field for very high throughput data fields of the packet.

4. The method of claim 1, wherein the one or more padding fields comprise one or more of a padding field for a high efficiency signal field of the packet, a forward error correction pre-padding field for a data field, a forward error correction post-padding field for the data field, and a packet extension.

5. The method of claim 1, further comprising:

after the receiver receives the packet, decoding, by a decoder in the receiver, a padding field in the packet corresponding to a location of the one or more locations to generate a decoded padding field;

descrambling, by a descrambler in the receiver, the pad field at the location according to the random seed to generate a set of data; and

judging whether the group of data is valid data or not according to a subset of the group of data.

6. The method of claim 1, wherein the one or more sets of valid data comprise one or more of information of available channels in the vicinity of the wireless local area network system, transmit power weights for a plurality of receivers, interference information, backoff time information, and contention window information.

7. The method of claim 6, wherein utilizing the one or more sets of valid data to increase overall performance of the wireless local area network system comprises:

the accuracy of channel estimation is improved by means of a plurality of the transmit power weights, or one or more of the interference information, the backoff time information, and the contention window information are transmitted through the one or more padding fields to reduce the number of data handoffs.

8. A transmitter for a wireless regional network system, comprising:

a processing circuit for calculating respective bit numbers of one or more padding fields located at one or more positions in a packet, wherein the processing circuit selects one or more groups of valid data corresponding to at least one predetermined bit number according to the respective bit numbers of the one or more padding fields;

a scrambler coupled to the processing circuit, wherein the scrambler scrambles one set of the one or more sets of valid data according to a random seed to generate scrambled valid data; and

an encoder, coupled to the scrambler, for encoding the scrambled valid data to generate padding data for filling a pad field of the one or more pad fields, wherein the padding data represents the set of valid data.

9. A receiver for a wireless local area network system, comprising:

a decoder, wherein after the receiver receives a packet, the decoder decodes padding data in a padding field of a location of one or more locations in the packet to generate decoded data;

a descrambler coupled to the decoder, wherein the descrambler descrambles the decoded data according to a random seed to generate a set of data; and

a processing circuit coupled to the descrambler, wherein the processing circuit determines whether the set of data is valid data according to a subset of the set of data,

wherein the pad data represents one or more sets of valid data and is generated by encoding the scrambled valid data by an encoder, the scrambled valid data being generated by scrambling one set of valid data of the one or more sets of valid data by a scrambler according to the random seed.