Introduction

Let’s first identify the following elements in a wireless network

Wireless Links and Network Characteristics

Wireless links differ from their wired counterpart in a number important ways

Thus, bit errors would be more common in wireless links than in wired links, and it have a stronger link-level RDT protocols that retransmit corrupted frames

For the receiver side, the signal-to-noise(SNR) is a relative measure of the strength of the received signal and noise, typically measured in units of dB. Another concept relating to this is the BER, bit errors rate

CDMA

Recall that when hosts communicate over a shared medium, a protocol is needed so that the signals sent by multiple senders do not interfere at the receivers. CDMA is used in wireless communication.

In a CDMA protocol, each bit being sent is encoded by multiplying the bit by a signal (the code) that changes at a much faster rate(the chipping rate) than the original sequence.

WiFi: 802.11 Wireless LANs