So You Want Wi-Fi？

　　開(kāi)發(fā)商在產(chǎn)品實(shí)現(xiàn)Wi-Fi是一個(gè)選擇的802.11個(gè)標(biāo)準(zhǔn)，包括802.11a，b，g，n或組合標(biāo)準(zhǔn)。那么你應(yīng)該選擇哪一個(gè)呢？讓我們回顧一下這些技術(shù)的優(yōu)點(diǎn)和折衷，以幫助您進(jìn)行有教養(yǎng)的選擇。

　　Wi-Fi背景

　　7億多人使用的Wi-Fi是增長(zhǎng)最快的技術(shù)之一。它是由NCR公司/ AT&T公司于1991在荷蘭發(fā)明的。“Wi-Fi”不是一個(gè)技術(shù)術(shù)語(yǔ)，但通常用來(lái)指IEEE 1997成立的802.11個(gè)標(biāo)準(zhǔn)。該標(biāo)準(zhǔn)在過(guò)去15年中不斷發(fā)展，以支持在快速增長(zhǎng)的市場(chǎng)中應(yīng)用更多的應(yīng)用程序。1999，成立Wi-Fi聯(lián)盟以促進(jìn)Wi-Fi的發(fā)展，并通過(guò)使用Wi-Fi技術(shù)認(rèn)證產(chǎn)品以確保業(yè)界的成功。

　　802.11b

　　802.11b was established by the IEEE in 1999 to improve the data rate of the original 802.11 standard created in 1997. The original 802.11 standard supported a maximum data rate of 2 Mbps. This standard is no longer supported by the industry and therefore is not relevant to this analysis. All 802.11/Wi-Fi standards use the unlicensed radio spectrum. 802.11b supports only the license-free ISM band around 2.4 GHz. The maximum data rate of 802.11b is 11 Mbps， which is the slowest relative to the other 802.11 standards. Currently， the main advantages of 802.11b are cost of chipsets and signal integrity， which is inherently due to high sensitivity at lower data rates.